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FEATURES
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LT3011 50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD DESCRIPTION
The LT(R)3011 is a high voltage, micropower, low dropout linear regulator. The device is capable of supplying 50mA of output current with a dropout voltage of 300mV. Designed for use in battery-powered high voltage systems, the low quiescent current (46A operating and 1A in shutdown) is well controlled in dropout, making the LT3011 an ideal choice. The LT3011 includes a PWRGD flag to indicate output regulation. The delay between regulated output level and flag indication is programmable with a single capacitor. The LT3011 also has the ability to operate with very small output capacitors; it is stable with only 1F on the output. Small ceramic capacitors can be used without the addition of any series resistance (ESR) as is common with other regulators. Internal protection circuitry includes reversebattery protection, current limiting, thermal limiting, and reverse current protection. The LT3011 features an adjustable output with a 1.24V reference voltage. The device is available in the thermally enhanced 12-lead MSOP and the low profile (0.75mm) 10-pin (3mm x 3mm) DFN package, both providing excellent thermal characteristics.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Wide Input Voltage Range: 3V to 80V Low Quiescent Current: 46A Low Dropout Voltage: 300mV Output Current: 50mA PWRGD Flag with Programmable Delay No Protection Diodes Needed Adjustable Output from 1.24V to 60V 1A Quiescent Current in Shutdown Stable with 1F Output Capacitor Stable with Ceramic, Tantalum, and Aluminum Capacitors Reverse-Battery Protection No Reverse Current Flow from Output to Input Thermal Limiting Thermally Enhanced 12-Lead MSOP and 10-Pin (3mm x 3mm) DFN Packages
APPLICATIONS
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Low Current High Voltage Regulators Regulator for Battery-Powered Systems Telecom Applications Automotive Applications
TYPICAL APPLICATION
5V Supply with Shutdown
IN VIN 3V TO 80V 1F 1.6M OUT LT3011 ADJ CT 249k VOUT 5V 50mA 1F 350 300 DROPOUT VOLTAGE (mV) 250 200 150 100 50 0 0 10
Dropout Voltage
750k
SHDN PWRGD GND
POWER GOOD
1000pF VSHDN <0.3V >2.0V OUTPUT OFF ON
3011 TA01
20 30 40 OUTPUT CURRENT (mA)
50
3011 TA02
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LT3011 ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN Pin Voltage .........................................................80V OUT Pin Voltage ......................................................60V Input-to-Output Differential Voltage ........................80V ADJ Pin Voltage ........................................................7V SHDN Pin Voltage ...................................................80V CT Pin Voltage .................................................. 7V, -0.5V PWRGD Pin Voltage ....................................... 80V, -0.5V Output Short-Circuit Duration .......................... Indefinite
Storage Temperature Range................... -65C to 150C Operating Junction Temperature (Notes 3, 10, 11) LT3011E, LT3011I .............................. -40C to 125C LT3011H ............................................ -40C to 150C Lead Temperature (Soldering, 10 sec) MSE Package Only ............................................ 300C
PIN CONFIGURATION
TOP VIEW OUT ADJ GND NC PWRGD 1 2 3 4 5 11 10 IN 9 NC 8 SHDN 7 NC 6 CT NC OUT ADJ GND NC PWRGD 1 2 3 4 5 6 TOP VIEW 12 11 10 9 8 7 NC IN NC SHDN NC CT
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DD PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFN
MSE PACKAGE 12-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 43C/W, JC = 16C/W EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
TJMAX = 150C, JA = 40C/W, JC = 16C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH LT3011EDD#PBF LT3011IDD#PBF LT3011EMSE#PBF LT3011HMSE#PBF LT3011IMSE#PBF LEAD BASED FINISH LT3011EDD LT3011IDD LT3011EMSE LT3011HMSE LT3011IMSE TAPE AND REEL LT3011EDD#TRPBF LT3011IDD#TRPBF LT3011EMSE#TRPBF LT3011HMSE#TRPBF LT3011IMSE#TRPBF TAPE AND REEL LT3011EDD#TR LT3011IDD#TR LT3011EMSE#TR LT3011HMSE#TR LT3011IMSE#TR PART MARKING* LDKQ LDKQ 3011 3011 3011 PART MARKING* LDKQ LDKQ 3011 3011 3011 PACKAGE DESCRIPTION 10-Lead (3mm x 3mm) Plastic DFN 10-Lead (3mm x 3mm) Plastic DFN 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP PACKAGE DESCRIPTION 10-Lead (3mm x 3mm) Plastic DFN 10-Lead (3mm x 3mm) Plastic DFN 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP TEMPERATURE RANGE -40C to 125C -40C to 125C -40C to 125C -40C to 150C -40C to 125C TEMPERATURE RANGE -40C to 125C -40C to 125C -40C to 125C -40C to 150C -40C to 125C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
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LT3011 ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Input Voltage ADJ Pin Voltage (Notes 2, 3) Line Regulation (Note 2) Load Regulation (Note 2) Dropout Voltage VIN = VOUT(NOMINAL) (Notes 4, 5) CONDITIONS ILOAD = 50mA VIN = 3V, ILOAD = 1mA 4V < VIN < 80V, 1mA < ILOAD < 50mA VIN = 3V to 80V, ILOAD = 1mA VIN = 4V, ILOAD = 1mA to 50mA VIN = 4V, ILOAD = 1mA to 50mA ILOAD = 1mA ILOAD = 1mA ILOAD = 10mA ILOAD = 10mA ILOAD = 50mA ILOAD = 50mA GND Pin Current VIN = VOUT(NOMINAL) (Notes 4, 6) Output Voltage Noise ADJ Pin Bias Current Shutdown Threshold SHDN Pin Current (Note 8) Quiescent Current in Shutdown PWRGD Trip Point PWRGD Trip Point Hysteresis PWRGD Output Low Voltage CT Pin Charging Current CT Pin Voltage Differential Ripple Rejection Current Limit Input Reverse Leakage Current Reverse Output Current (Note 9) VCT(PWRGD High) - VCT(PWRGD Low) VIN = 7V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 50mA VIN = 7V, VOUT = 0V VIN = 4V, VOUT = -0.1V (Note 2) VIN = -80V, VOUT = 0V VOUT = 1.24V, VIN < 1.24V (Note 2)
l l l l l l l l l l l l l
(LT3011E, LT3011I) The l denotes the specifications which apply over the -40C to 125C operating temperature range, otherwise specifications are TJ = 25C.
MIN 1.228 1.215 TYP 2.8 1.24 1.24 1 6 100 200 300 46 105 410 1.9 100 30
l l
MAX 4 1.252 1.265 12 15 25 150 190 260 350 370 550 90 200 700 3.3 100 2 2 0.5 5 94 250 6
UNITS V V V mV mV mV mV mV mV mV mV mV A A A mA VRMS nA V V A A A % % mV A V dB mA mA
ILOAD = 0mA ILOAD = 1mA ILOAD = 10mA ILOAD = 50mA COUT = 10F ILOAD = 50mA, BW = 10Hz to 100kHz, VOUT = 1.24V , (Note 7 ) VOUT = Off to On VOUT = On to Off VSHDN = 0V VSHDN = 6V VIN = 6V, VSHDN = 0V % of Nominal Output Voltage, Output Rising % of Nominal Output Voltage IPWRGD = 50A
0.3
1.3 1.1 0.5 0.1 1
l l l
85
90 1.1 140 3 1.67
65 60
85 140 6 8 15
mA A
ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Input Voltage ADJ Pin Voltage (Notes 2, 3) Line Regulation (Note 2) Load Regulation (Note 2) CONDITIONS ILOAD = 50mA
(LT3011H) The l denotes the specifications which apply over the -40C to 150C operating temperature range, otherwise specifications are TJ = 25C.
MIN
l l l l
TYP 2.8 1.24 1.24 1 6
MAX 4 1.252 1.265 12 15 25
UNITS V V V mV mV mV
VIN = 3V, ILOAD = 1mA 4V < VIN < 80V, 1mA < ILOAD < 50mA VIN = 3V to 80V, ILOAD = 1mA VIN = 4V, ILOAD = 1mA to 50mA VIN = 4V, ILOAD = 1mA to 50mA
1.228 1.215
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LT3011 ELECTRICAL CHARACTERISTICS
PARAMETER Dropout Voltage VIN = VOUT(NOMINAL) (Notes 4, 5) CONDITIONS ILOAD = 1mA ILOAD = 1mA ILOAD = 10mA ILOAD = 10mA ILOAD = 50mA ILOAD = 50mA GND Pin Current VIN = VOUT(NOMINAL) (Notes 4, 6) Output Voltage Noise ADJ Pin Bias Current Shutdown Threshold SHDN Pin Current (Note 8) Quiescent Current in Shutdown PWRGD Trip Point PWRGD Trip Point Hysteresis PWRGD Output Low Voltage CT Pin Charging Current CT Pin Voltage Differential Ripple Rejection Current Limit Input Reverse Leakage Current Reverse Output Current (Note 9) VCT(PWRGD High) - VCT(PWRGD Low) VIN = 7V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 50mA VIN = 7V, VOUT = 0V VIN = 4V, VOUT = -0.1V (Note 2) VIN = -80V, VOUT = 0V VOUT = 1.24V, VIN < 1.24V (Note 2)
l l l l l l l l l
(LT3011H) The l denotes the specifications which apply over the -40C to 150C operating temperature range, otherwise specifications are at TJ = 25C.
MIN TYP 100 200 300 46 105 410 1.9 100 30
l l
MAX 150 220 260 380 370 575 125 225 750 3.5 100 2 2 0.5 5 95 250 6
UNITS mV mV mV mV mV mV A A A mA VRMS nA V V A A A % % mV A V dB mA mA
ILOAD = 0mA ILOAD = 1mA ILOAD = 10mA ILOAD = 50mA COUT = 10F ILOAD = 50mA, BW = 10Hz to 100kHz, VOUT = 1.24V , (Note 7) VOUT = Off to On VOUT = On to Off VSHDN = 0V VSHDN = 6V VIN = 6V, VSHDN = 0V % of Nominal Output Voltage, Output Rising % of Nominal Output Voltage IPWRGD = 50A
0.3
1.3 1.1 0.5 0.1 1
l l l
85
90 1.1 140 3 1.67
65 60
85 140 6 8 15
mA A
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3011 is tested and specified for these conditions with the ADJ pin connected to the OUT pin. Note 3: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited. Note 4: To satisfy requirements for minimum input voltage, the LT3011 is tested and specified for these conditions with an external resistor divider (249k bottom, 409k top) for an output voltage of 3.3V. The external resistor divider will add a 5A DC load on the output. Note 5: Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. In dropout, the output voltage will be equal to (VIN - VDROPOUT). Note 6: GND pin current is tested with VIN = VOUT(NOMINAL) and a current source load. This means the device is tested while operating close to its
dropout region. This is the worst-case GND pin current. The GND pin current will decrease slightly at higher input voltages. Note 7: ADJ pin bias current flows into the ADJ pin. Note 8: SHDN pin current flows out of the SHDN pin. Note 9: Reverse output current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. This current flows into the OUT pin and out the GND pin. Note 10: The LT3011 regulators are tested and specified under pulse load conditions such that TJ TA. The LT3011E regulators are 100% tested at TA = 25C. Performance of the LT3011E over the full -40C to 125C operating junction temperature range is assured by design, characterization and correlation with statistical process controls. The LT3011I regulators are guaranteed over the full -40C to 125C operating junction temperature range. The LT3011H is tested to the LT3011H Electrical Characteristics table at 150C operating junction temperature. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125C. Note 11: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125C (LT3011E/LT3011I) or 150C (LT3011H) when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.
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LT3011 TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
400 350 TJ DROPOUT VOLTAGE (mV) 300 250 200 150 100 50 0 0 10 20 30 40 50
3011 G01
TJ = 25C, unless otherwise noted.
Guaranteed Dropout Voltage
600 = TEST POINTS 400 350 DROPOUT VOLTAGE (mV) 300 250 500 DROPOUT VOLTAGE (mV) 400 300 TJ 200 100 0 0 5 10 15 20 25 30 35 40 45 50 OUTPUT CURRENT (mA)
3011 G02
Dropout Voltage
IL = 50mA
125 C 25 C
TJ
TJ
125 C
IL = 10mA 200 150 100 50 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G03
25 C
IL = 1mA
OUTPUT CURRENT (mA)
Quiescent Current
80 70 QUIESCENT CURRENT (A) 60 50 40 30 20 10 0 -50 -25 VSHDN = GND 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G04
ADJ Pin Voltage
1.250 1.248 ADJ PIN VOLTAGE (V) IL = 1mA QUIESCENT CURRENT (A) 80
Quiescent Current
TJ = 25C 70 RL = 60 50 40 30 20 10 0 VSHDN = VIN
VIN = 6V RL = IL = 0 VSHDN = VIN
1.246 1.244 1.242 1.240 1.238 1.236 1.234 1.232 1.230 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G05
0
1
2
3
4567 INPUT VOLTAGE (V)
8
9
10
3011 G06
GND Pin Current
2.0 1.8 GND PIN CURRENT (mA) GND PIN CURRENT (mA) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1 2 RL = 124 IL = 10mA* RL = 1.24k, IL = 1mA* 34567 INPUT VOLTAGE (V) 8 9 10 RL = 49.6 IL = 25mA* RL = 24.8 IL = 50mA* 2.0
GND Pin Current vs IOUT
VIN = VOUT(NOMINAL) +1V 1.8 TJ = 25C SHDN PIN THRESHOLD (V) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 30 35 40 45 50 OUTPUT CURRENT (mA)
3011 G08
SHDN Pin Threshold
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G09
TJ = 25C *FOR VOUT = 1.24V
3011 G07
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LT3011 TYPICAL PERFORMANCE CHARACTERISTICS
SHDN Pin Current
0.28 TJ = 25C CURRENT FLOWS 0.24 OUT OF SHDN PIN SHDN PIN CURRENT (A) 0.20 0.16 0.12 0.08 0.04 0 0 0.5 1 3.5 4 SHDN PIN VOLTAGE (V) 1.5 2 2.5 3 4.5
3011 G10
TJ = 25C, unless otherwise noted.
SHDN Pin Current
0.6 0.5 SHDN PIN CURRENT (A) 0.4 0.3 0.2 0.1 0 -50 -25 VSHDN = 0V CURRENT FLOWS OUT OF SHDN PIN ADJ PIN BIAS CURRENT (nA) 120 100 80 60 40 20
ADJ Pin Bias Current
5
0
25 50 75 100 125 150 TEMPERATURE (C)
3011 G11
0 -50 -25
0
25 50 75 100 125 150 TEMPERATURE (C)
3011 G12
PWRGD Trip Point
PWRGD TRIP POINT (% OF OUTPUT VOLTAGE) 95 PWRGD OUTPUT LOW VOLTAGE (mV) 94 93 92 91 90 89 88 87 86 85 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G13
PWRGD Output Low Voltage
200 180 160 140 120 100 80 60 40 20 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G14
CT Charging Current
4.0 3.5 CT CHARGING CURRENT (A) 3.0 2.5 2.0 1.5 1.0 0.5 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G15
IPWRGD = 50A
PWRGD TRIPPED HIGH
OUTPUT RISING OUTPUT FALLING
CT Comparator Threshold
2.0 CT COMPARATOR THRESHOLD (V) 1.8 1.6 CURRENT LIMIT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 -25 VCT(LOW) 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G16
Current Limit
180 160 140 CURRENT LIMIT (mA) 120 100 80 60 40 20 0 0 1 2 34567 INPUT VOLTAGE (V) 8 9 10 VOUT = 0V TJ = 25C 200 180 160 140 120 100 80 60 40 20
Current Limit
VCT(HIGH)
VIN = 7V VOUT = 0V 0 -50 -25 0
25 50 75 100 125 150 TEMPERATURE (C)
3011 G18
3011 G17
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LT3011 TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Output Current
160 REVERSE OUTPUT CURRENT (A) ADJ PIN CLAMP (SEE APPLICATIONS INFORMATION) REVERSE OUTPUT CURRENT (A) 140 120 100 80 60 40 20 0 0 1 2 TJ = 25C VIN = 0V CURRENT FLOWS INTO OUTPUT PIN VOUT = VADJ 34567 OUTPUT VOLTAGE (V) 8 9 10
3011 G19
TJ = 25C, unless otherwise noted.
Reverse Output Current
80 70 60 50 40 30 20 10 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G20
Input Ripple Rejection
90 VIN = 7V + 0.5VP-P RIPPLE AT f = 120Hz 88 IL = 50mA VOUT = 1.24V 86 RIPPLE REJECTION (dB) 84 82 80 78 76 74 72 70 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G21
VIN = 0V VOUT = VADJ = 1.24V
Input Ripple Rejection
100 VIN = 7V + 50mVRMS RIPPLE 90 IL = 50mA, VOUT = 1.24V MINIMUM INPUT VOLTAGE (V) 4.0 3.5 COUT = 10F CERAMIC
Minimum Input Voltage
IL = 50mA 0 -2 LOAD REGULATION (mV) -4 -6 -8 -10
Load Regulation
IL = 1mA TO 50mA VOUT = 1.24V
80 RIPPLE REJECTION (dB) 70 60 50 40 30 20 10 0 10 100 1k 10k FREQUENCY (Hz) 100k 1M
3011 G22
3.0 2.5 2.0 1.5 1.0 0.5 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
3011 G23
COUT = 1F CERAMIC
-12 -50 -25
0
25 50 75 100 125 150 TEMPERATURE (C)
3011 G24
Output Noise Spectral Density
10 VOUT = 1.24V COUT = 1F IL = 50mA
Output Noise (10Hz to 100kHz)
OUTPUT VOLTAGE DEVIATION (V) VOUT = 1.24V COUT = 1F IL = 50mA WORST-CASE NOISE VOUT 100V/DIV 0.3 0.2 0.1 0 -0.1 -0.2 LOAD CURRENT (mA)
Transient Response
OUTPUT NOISE SPECTRAL DENSITY (V/ Hz)
1
0.1
0.01 1ms/DIV
3011 G26
50 25 0
0.001 10
VIN = 6V VOUT SET FOR 5V CIN = 1F CERAMIC COUT = 1F CERAMIC ILOAD = 1mA TO 50mA 0 100 200 300 400 500 600 700 800 900 1000 TIME (s) 3011 G27
100
1k 10k FREQUENCY (Hz)
100k
3011 G25
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LT3011 PIN FUNCTIONS
(DFN/MSOP)
OUT (Pin 1/Pin 2): Output. The output supplies power to the load. A minimum output capacitor of 1F is required to prevent oscillations. Larger capacitors will be required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse output characteristics. ADJ (Pin 2/Pin 3): Adjust. This is the input to the error amplifier. This pin is internally clamped to 7V. It has a bias current of 30nA which flows into the pin (see the curve labeled ADJ Pin Bias Current vs Temperature in the Typical Performance Characteristics section). The ADJ pin voltage is 1.24V referenced to ground, and the output voltage range is 1.24V to 60V. GND (Pins 3, 11/Pins 4, 13): Ground. The exposed backside of the package (Pin 11/Pin 13) is an electrical connection for GND. As such, to ensure optimum device operation and thermal performance, the Exposed Pad must be connected directly to Pin 3/Pin 4 on the PC board. NC (Pins 4, 7, 9/Pins 1, 5, 8, 10, 12): No Connection. These pins have no internal connection. Connecting NC pins to a copper area for heat dissipation provides a small improvement in thermal performance. PWRGD (Pin 5/Pin 6): Power Good. The PWRGD flag is an open-collector flag to indicate that the output voltage has increased above 90% of the nominal output voltage. There is no internal pull-up on this pin; a pull-up resistor must be used. The PWRGD pin will change state from an open-collector pull-down to high impedance after both the output is above 90% of the nominal voltage and the capacitor on the CT pin has charged through a 1.67V differential. The maximum pull-down current of the PWRGD pin in the low state is 50A.
CT (Pin 6/Pin 7): Timing Capacitor. The CT pin allows the use of a small capacitor to delay the timing between the point where the output crosses the PWRGD threshold and the PWRGD flag changes to a high impedance state. Current out of this pin during the charging phase is 3A. The voltage difference between the PWRGD low and PWRGD high states is 1.67V (see the Applications Information section). SHDN (Pin 8/Pin 9): Shutdown. The SHDN pin is used to put the LT3011 into a low power shutdown state. The output will be off when the SHDN pin is pulled low. The SHDN pin can be driven either by 5V logic or open-collector logic with a pull-up resistor. The pull-up resistor is only required to supply the pull-up current of the open-collector gate, normally several microamperes. If unused, the SHDN pin must be tied to a logic high or VIN. IN (Pin 10/Pin 11): Input. Power is supplied to the device through the IN pin. A bypass capacitor is required on this pin if the device is more than six inches away from the main input filter capacitor. In general, the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 1F to 10F is sufficient. The LT3011 is designed to withstand reverse voltages on the IN pin with respect to ground and the OUT pin. In the case of a reverse input voltage, which can occur if a battery is plugged in backwards, the LT3011 will act as if there is a diode in series with its input. There will be no reverse current flow into the LT3011 and no reverse voltage will appear at the load. The device will protect both itself and the load. Exposed Pad (Pin 11/Pin 13): Ground. The Exposed Pad must be soldered to the PCB.
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LT3011 APPLICATIONS INFORMATION
The LT3011 is a 50mA high voltage/low dropout regulator with micropower quiescent current and shutdown. The device is capable of supplying 50mA at a dropout voltage of 300mV. The low operating quiescent current (46A) drops to 1A in shutdown. In addition to low quiescent current, the LT3011 incorporates several protection features which make it ideal for use in battery-powered systems. The device is protected against both reverse input and reverse output voltages. In battery backup applications where the output can be held up by a backup battery when the input is pulled to ground, the LT3011 acts like it has a diode in series with its output and prevents reverse current flow. Adjustable Operation The LT3011 has an output voltage range of 1.24V to 60V. The output voltage is set by the ratio of two external resistors as shown in Figure 1. The device servos the output to maintain the voltage at the adjust pin at 1.24V referenced to ground. The current in R1 is then equal to 1.24V/R1 and the current in R2 is the current in R1 plus the ADJ pin bias current. The ADJ pin bias current, 30nA at 25C, flows through R2 into the ADJ pin. The output voltage can be calculated using the formula in Figure 1. The value of R1 should be less than 250k to minimize errors in the output voltage caused by the ADJ pin bias current. Note that in shutdown the output is turned off and the divider current will be zero. The adjustable device is tested and specified with the ADJ pin tied to the OUT pin and a 5A DC load (unless otherwise specified) for an output voltage of 1.24V. Specifications for output voltages greater than 1.24V will be proportional to the ratio of the desired output voltage to 1.24V; (VOUT/1.24V). For example, load regulation for an output current change of 1mA to 50mA is -6mV (typical) at VOUT = 1.24V. At VOUT = 12V, load regulation is: 12V * - 6 mV = - 58mV 1 . 24V Output Capacitance and Transient Response The LT3011 is designed to be stable with a wide range of output capacitors. The ESR of the output capacitor affects stability, most notably with small capacitors. A minimum output capacitor of 1F with an ESR of 3 or less is recommended to prevent oscillations. The LT3011 is a micropower device and output transient response will be a function of output capacitance. Larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. Bypass capacitors, used to decouple individual components powered by the LT3011, will increase the effective output capacitor value. Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across temperature and applied voltage. The most common dielectrics used are specified with EIA temperature characteristic codes of Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are good for providing high capacitances
VOUT = VADJ 1 + R2 + (IADJ)(R2) R1 VADJ = 1.24V IADJ = 30nA AT 25 C OUTPUT RANGE = 1.24V TO 60V
IN VIN
OUT LT3011 ADJ GND R1 R2
+
VOUT
3011 F01
Figure 1. Adjustable Operation
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LT3011 APPLICATIONS INFORMATION
in a small package, but they tend to have strong voltage and temperature coefficients, as shown in Figures 2 and 3. When used with a 5V regulator, a 16V 10F Y5V capacitor can exhibit an effective value as low as 1F to 2F for the DC bias voltage applied and over the operating temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. The X7R type has better stability across temperature, while the X5R is less expensive and is available in higher values. Care still must be exercised when using X5R and X7R capacitors; the X5R and X7R codes only specify operating temperature range and maximum capacitance change over temperature. Capacitance change due to DC bias with X5R and X7R capacitors is better than Y5V and Z5U capacitors, but can still be significant enough to drop capacitor values below appropriate levels. Capacitor DC bias characteristics tend to improve as component case size increases, but expected capacitance at operating voltage should be verified. Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way piezoelectric accelerometer or microphone works. For a ceramic capacitor, the stress can be induced by vibrations in the system or thermal transients. PWRGD Flag and Timing Capacitor Delay The PWRGD flag is used to indicate that the ADJ pin voltage is within 10% of the regulated voltage. The PWRGD pin is an open-collector output, capable of sinking 50A of current when the ADJ pin voltage is low. There is no internal pull-up on the PWRGD pin; an external pull-up resistor must be used. When the ADJ pin rises to within 10% of its final reference value, a delay timer is started. At the end of this delay, programmed by the value of the capacitor on the CT pin, the PWRGD pin switches to a high impedance and is pulled up to a logic level by an external pull-up resistor. To calculate the capacitor value on the CT pin, use the following formula: ICT * t DELAY C TIME = VCT(HIGH) - VCT (LOW) Figure 4 shows a block diagram of the PWRGD circuit. At start-up, the timing capacitor is discharged and the PWRGD pin will be held low. As the output voltage increases and the ADJ pin crosses the 90% threshold, the JK flipflop is reset, and the 3A current source begins to charge the timing capacitor. Once the voltage on the CT pin reaches the VCT(HIGH) threshold (approximately 1.7V at 25C), the capacitor voltage is clamped and the PWRGD pin is set to a high impedance state.
20 0 CHANGE IN VALUE (%)
BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 F CHANGE IN VALUE (%) X5R
40 20 0 X5R -20 -40 -60 -80 Y5V
-20 -40 -60 Y5V -80
-100
0
2
4
8 6 10 12 DC BIAS VOLTAGE (V)
14
16
BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 F -100 50 25 75 -50 -25 0 TEMPERATURE ( C)
100
125
3011 F02
3011 F03
Figure 2. Ceramic Capacitor DC Bias Characteristics
Figure 3. Ceramic Capacitor Temperature Characteristics
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10
LT3011 APPLICATIONS INFORMATION
During normal operation, an internal glitch filter will ignore short transients (<15s). Longer transients below the 90% threshold will reset the JK flip-flop. This flip-flop ensures that the capacitor on the CT pin is quickly discharged all the way to the VCT(LOW) threshold before restarting the time delay. This provides a consistent time delay after the ADJ pin is within 10% of the regulated voltage before the PWRGD pin switches to high impedance. Thermal Considerations The power handling capability of the device will be limited by the maximum rated junction temperature (125C, LT3011E/ LT3011I or 150C, LT3011H). The power dissipated by the device will be made up of two components: 1. Output current multiplied by the input/output voltage differential: IOUT * (VIN - VOUT) and, 2. GND pin current multiplied by the input voltage: IGND * VIN The GND pin current is found by examining the GND pin current curves in the Typical Performance Characteristics section. Power dissipation will be equal to the sum of the two components listed above. The LT3011 series regulators have internal thermal limiting designed to protect the device during overload conditions. For continuous normal conditions, the maximum junction temperature rating of 125C (LT3011E/ LT3011I) or 150C (LT3011H) must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. Additional heat sources mounted nearby must also be considered.
ICT 3A CT PWRGD
For surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces. Copper board stiffeners and plated through-holes can also be used to spread the heat generated by power devices. The following table lists thermal resistance for several different board sizes and copper areas. All measurements were taken in still air on 3/32" FR-4 board with one ounce copper.
Table 1. MSOP Measured Thermal Resistance
COPPER AREA TOPSIDE BACKSIDE 2500 sq mm 2500 sq mm 1000 sq mm 2500 sq mm 225 sq mm 100 sq mm 2500 sq mm 2500 sq mm THERMAL RESISTANCE BOARD AREA (JUNCTION-TO-AMBIENT) 2500 sq mm 2500 sq mm 2500 sq mm 2500 sq mm 52C/W 54C/W 58C/W 64C/W
Table 2. DFN Measured Thermal Resistance
COPPER AREA TOPSIDE BACKSIDE 2500 sq mm 2500 sq mm 1000 sq mm 2500 sq mm 225 sq mm 100 sq mm 2500 sq mm 2500 sq mm THERMAL RESISTANCE BOARD AREA (JUNCTION-TO-AMBIENT) 2500 sq mm 2500 sq mm 2500 sq mm 2500 sq mm 52C/W 54C/W 58C/W 64C/W
ADJ
+
J Q
VREF * 90%
-
K
VCT(HIGH) - VBE ( 1.1V)
The thermal resistance junction-to-case (JC), measured at the Exposed Pad on the back of the die, is 16C/W. Continuous operation at large input/output voltage differentials and maximum load current is not practical due to thermal limitations. Transient operation at high input/ output differentials is possible. The approximate thermal time-constant for a 2500sq mm 3/32" FR-4 board, with maximum topside and backside area for one ounce copper, is three seconds. This time-constant will increase as more thermal mass is added (i.e., vias, larger board and other components). For an application with transient high power peaks, average power dissipation can be used for junction temperature calculations as long as the pulse period is significantly less than the thermal time constant of the device and board.
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Figure 4. PWRGD Circuit Block Diagram
-
VCT(LOW) 0.1V
3011 F04
+
11
LT3011 APPLICATIONS INFORMATION
Calculating Junction Temperature Example 1: Given an output voltage of 5V, an input voltage range of 24V to 30V, an output current range of 0mA to 50mA, and a maximum ambient temperature of 50C, what will the maximum junction temperature be? The power dissipated by the device will be equal to: IOUT(MAX) * (VIN(MAX) - VOUT) + (IGND * VIN(MAX)) Where: IOUT(MAX) = 50mA VIN(MAX) = 30V IGND at (IOUT = 50mA, VIN = 30V) = 1mA So: P = 50mA * (30V - 5V) + (1mA * 30V) = 1.28W The thermal resistance will be in the range of 52C/W to 64C/W depending on the copper area. So, the junction temperature rise above ambient will be approximately equal to: 1.28W * 58C/W = 74C The maximum junction temperature will then be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or: TJMAX = 50C + 74C = 124C Example 2: Given an output voltage of 5V, an input voltage of 48V that rises to 72V for 5ms (max) out of every 100ms, and a 5mA load that steps to 50mA for 50ms out of every 250ms, what is the junction temperature rise above ambient? Using a 500ms period (well under the time-constant of the board), power dissipation is as follow: P1 (48VIN, 5mA load) = 5mA * (48V - 5V) + (200A * 48V) = 0.23W P2 (48VIN, 50mA load) = 50mA * (48V - 5V) + (1mA * 48V) = 2.20W P3 (72VIN, 5mA load) = 5mA (72V - 5V) + (200A * 72V) = 0.35W P1 (72VIN, 50mA load) = 50mA (72V - 5V) + (1mA * 72V) = 3.42W Operation at the different power levels is as follows: 76% operation at P1, 19% for P2, 4% for P3, and 1% for P4. PEFF = 76%(0.23W) + 19%(2.20W) + 4%(0.35W) + 1%(3.42W) = 0.64W With a thermal resistance in the range of 52C/W to 64C/W, this translates to a junction temperature rise above ambient of 33C to 41C. High Temperature Operation Care must be taken when designing LT3011 applications to operate at high ambient temperatures. The LT3011 works at elevated temperatures but erratic operation can occur due to unforeseen variations in external components. Some tantalum capacitors are available for high temperature operation, but ESR is often several ohms; capacitor ESR above 3 is unsuitable for use with the LT3011. Ceramic capacitor manufacturers (Murata, AVX, TDK and Vishay Vitramon at this writing) now offer ceramic capacitors that are rated to 150C using an X8R dielectric. Device instability will occur if the output capacitor value and ESR are outside design limits at elevated temperature and operating DC voltage bias (see information on capacitor characteristics under Output Capacitance and Transient Response). Check each passive component for absolute value and voltage ratings over the operating temperature range. Leakage in capacitors, or from solder flux left after insufficient board cleaning, adversely affects the low quiescent current operation. Consider junction temperature increase due to power dissipation in both the junction and nearby components to ensure maximum specifications are not violated for the LT3011E/LT3011H/LT3011I or external components. Protection Features The LT3011 incorporates several protection features which make it ideal for use in battery-powered circuits. In addition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the device is protected against reverse-input voltages, and reverse voltages from output-to-input.
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12
LT3011 APPLICATIONS INFORMATION
Current limit protection and thermal overload protection are intended to protect the device against current overload conditions at the output of the device. For normal operation, the junction temperature should not exceed 125C (LT3011E/LT3011I) or 150C (LT3011H). The input of the device will withstand reverse voltages of 80V. Current flow into the device will be limited to less than 6mA (typically less than 100A) and no negative voltage will appear at the output. The device will protect both itself and the load. This provides protection against batteries which can be plugged in backwards. The ADJ pin of the adjustable device can be pulled above or below ground by as much as 7V without damaging the device. If the input is left open-circuit or grounded, the ADJ pin will act like an open-circuit when pulled below ground, and like a large resistor (typically 100k) in series with a diode when pulled above ground. If the input is powered by a voltage source, pulling the ADJ pin below the reference voltage will cause the device to try and force the current limit out of the output. This will cause the output to go to an unregulated high voltage. Pulling the ADJ pin above the reference voltage will turn off all output current. In situations where the ADJ pin is connected to a resistor divider that would pull the ADJ pin above its 7V clamp voltage if the output is pulled high, the ADJ pin input current must be limited to less than 5mA. For example, a resistor
160 REVERSE OUTPUT CURRENT (A) 140 120 100 80 60 40 20 0 0 1 2 TJ = 25C VIN = 0V CURRENT FLOWS INTO OUTPUT PIN VOUT = VADJ 34567 OUTPUT VOLTAGE (V) 8 9 10
3011 F05
divider is used to provide a regulated 1.5V output from the 1.24V reference when the output is forced to 60V. The top resistor of the resistor divider must be chosen to limit the current into the ADJ pin to less than 5mA when the ADJ pin is at 7V. The 53V difference between the OUT and ADJ pin is divided by the 5mA maximum current into the ADJ pin yields a minimum top resistor value of 10.6k. In circuits where a backup battery is required, several different input/output conditions can occur. The output voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage, or is left open-circuit. Current flow back into the output will follow the curve shown in Figure 5. The rise in reverse output current above 7V occurs from the breakdown of the 7V clamp on the ADJ pin. With a resistor divider on the regulator output, this current will be reduced depending on the size of the resistor divider. When the IN pin of the LT3011 is forced below the OUT pin or the OUT pin is pulled above the IN pin, input current will typically drop to less than 2A. This can happen if the input of the LT3011 is connected to a discharged (low voltage) battery and the output is held up by either a backup battery or a second regulator circuit. The state of the SHDN pin will have no effect on the reverse output current when the output is pulled above the input.
ADJ PIN CLAMP (SEE ABOVE)
Figure 5. Reverse Output Current
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13
LT3011 TYPICAL APPLICATIONS
5V Buck Converter with Low Current Keep Alive Backup
D2 D1N914 6 VIN 5.5V* TO 60V 4 C3 4.7 F 100V CERAMIC 15 14 BOOST VIN LT1766 SHDN SYNC GND BIAS FB VC CC 1nF 10 12 R1 15.4k R2 4.99k C1 100 F 10V SOLID TANTALUM SW 2 D1 10MQ060N C2 0.33 F
L1 15 H
Buck Converter Efficiency vs Load Current
VOUT 5V 1A/250mA 100 VOUT = 5V L = 68 H VIN = 10V
90 EFFICIENCY (%) VIN = 42V 80
+
70
1, 8, 9, 16 11 60
50 10 OPERATING CURRENT LOW HIGH 100k 8 5 IN LT3011 SHDN PWRGD GND 3, 11 CT 6 1000pF ADJ 2 OUT 1
3011 TA03
0
0.25
750k * FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY INCREASE L1 TO 30 H FOR LOAD CURRENTS ABOVE 0.6A AND TO 249k 60 H ABOVE 1A. LT3011 PIN NUMBERS ARE FOR THE DD PACKAGE.
0.75 1.00 0.50 LOAD CURRENT (A)
1.25
3011 TA04
LT3011 Automotive Application
VIN 12V (FUTURE 42V)
+
1F
IN NO PROTECTION DIODE NEEDED! LT3011 SHDN GND
OUT 750k ADJ 249k 1F LOAD: CLOCK, SECURITY SYSTEM ETC
OFF ON
LT3011 Telecom Application
VIN 48V (72V TRANSIENT) 1F
IN LT3011 SHDN GND
OUT 750k NO PROTECTION DIODE NEEDED! 249k
3011 TA05
+
1F LOAD: SYSTEM MONITOR ETC
ADJ
-
BACKUP BATTERY
OFF ON
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14
LT3011 PACKAGE DESCRIPTION
DD Package 10-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1699)
R = 0.115 TYP 6 0.675 0.05 10 0.38 0.10
3.50 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 PIN 1 TOP MARK (SEE NOTE 6)
3.00 0.10 (4 SIDES)
1.65 0.10 (2 SIDES)
(DD) DFN 1103
5 0.50 BSC 2.38 0.05 (2 SIDES) 0.200 REF 0.75 0.05 2.38 0.10 (2 SIDES)
1 0.25 0.05 0.50 BSC
0.00 - 0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2). CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS
BOTTOM VIEW--EXPOSED PAD
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
MSE Package 12-Lead Plastic MSOP Exposed Die Pad ,
(Reference LTC DWG # 05-08-1666 Rev B)
BOTTOM VIEW OF EXPOSED PAD OPTION
2.845 (.112 0.102 .004)
0.889 (.035
0.127 .005)
2.845 (.112
1
0.102 .004)
6 0.35 REF
5.23 (.206) MIN
1.651 (.065
0.102 3.20 - 3.45 .004) (.126 - .136)
0.12 REF DETAIL "B" CORNER TAIL IS PART OF DETAIL "B" THE LEADFRAME FEATURE. FOR REFERENCE ONLY 7 NO MEASUREMENT PURPOSE
12
0.65 0.42 0.038 (.0256) (.0165 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT
4.039 0.102 (.159 .004) (NOTE 3)
12 11 10 9 8 7
0.406 0.076 (.016 .003) REF
0.254 (.010) GAUGE PLANE
DETAIL "A" 0 - 6 TYP 4.90 0.152 (.193 .006) 3.00 0.102 (.118 .004) (NOTE 4)
0.53 0.152 (.021 .006) DETAIL "A" 0.18 (.007) 123456 1.10 (.043) MAX 0.86 (.034) REF
SEATING PLANE
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.22 -0.38 (.009 - .015) TYP
0.650 (.0256) BSC
0.1016 (.004
0.0508 .002)
MSOP (MSE12) 0608 REV B
3011f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT3011 TYPICAL APPLICATION
Constant Brightness for Indicator LED over Wide Input Voltage Range
RETURN 1F OFF ON IN OUT LT3011 SHDN GND -48V CAN VARY FROM -4V TO -80V -48V ILED = 1.24V/RSET ADJ RSET
3011 TA06
1F
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3011f
ThinSOT is a trademark of Linear Technology Corporation.
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(408) 432-1900 FAX: (408) 434-0507
LT 0808 * PRINTED IN USA
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