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LTC3025 300mA Micropower VLDO Linear Regulator FEATURES
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DESCRIPTION
The LTC(R)3025 is a micropower, VLDOTM (very low dropout) linear regulator which operates from input voltages as low as 0.9V. The device is capable of supplying 300mA of output current with a typical dropout voltage of only 45mV. A BIAS supply is required to run the internal reference and LDO circuitry while output current comes directly from the IN supply for high efficiency regulation. The low 0.4V internal reference voltage allows the LTC3025 output to be programmed to much lower voltages than available in common LDOs (range of 0.4V to 3.6V). The output voltage is programmed via two ultrasmall SMD resistors. The LTC3025's low quiescent current makes it an ideal choice for use in battery-powered systems. For 3-cell NiMH and single cell Li-Ion applications, the BIAS voltage can be supplied directly from the battery while the input can come from a high efficiency buck regulator, providing a high efficiency, low noise output. Other features include high output voltage accuracy, excellent transient response, stability with ultralow ESR ceramic capacitors as small as 1F short-circuit and , thermal overload protection and output current limiting. The LTC3025 is available in a tiny, low profile (0.75mm) 6-lead DFN (2mm x 2mm) package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. VLDO is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Wide Input Voltage Range: 0.9V to 5.5V Stable with Ceramic Capacitors Very Low Dropout: 45mV at 300mA Adjustable Output Range: 0.4V to 3.6V 2% Voltage Accuracy over Temperature Supply Load Low Noise: 80VRMS (10Hz to 100kHz) BIAS Voltage Range: 2.5V to 5.5V Fast Transient Recovery Shutdown Disconnects Load from VIN and VBIAS Low Operating Current: IIN = 4A, IBIAS = 50A Typ Low Shutdown Current: IIN = 1A, IBIAS = 0.01A Typ Output Current Limit Thermal Overload Protection Available in 6-Lead (2mm x 2mm) DFN Package
APPLICATIONS
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Low Power Handheld Devices Low Voltage Logic Supplies DSP Power Supplies Cellular Phones Portable Electronic Equipment Handheld Medical Instruments Post Regulator for Switching Supply Noise Rejection
TYPICAL APPLICATION
1.2V Output Voltage from 1.5V Input Supply
50 BIAS Li-Ion OR 3-CELL NiMH 1.5V HIGH EFFICIENCY 1.5V DC/DC BUCK 0.1F IN 0.1F OFF ON SHDN GND
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1MHz VIN Supply Rejection
1F VOUT = 1.2V IOUT 300mA 45 40 REJECTION (dB) 35 30 25 20 15 10 5 BIAS = 3.6V VOUT = 1.2V 0 1.2 1.4 1.6 IOUT = 100mA IOUT = 300mA 1.8 2.0 VIN (V) 2.2 2.4 2.6
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OUT LTC3025 ADJ 40.2k 80.6k
COUT = 10F
COUT = 1F
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LTC3025 ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW BIAS 1 GND 2 IN 3 7 6 SHDN 5 ADJ 4 OUT
VBIAS, VIN to GND......................................... -0.3V to 6V SHDN to GND............................................... -0.3V to 6V ADJ to GND.................................................. -0.3V to 6V VOUT ........................................-0.3V to VIN + 0.3V or 6V Operating Junction Temperature Range (Note 3).................................................. -40C to 125C Storage Temperature Range................... -65C to 125C Output Short-Circuit Duration .......................... Indefinite
DC6 PACKAGE 6-LEAD (2mm 2mm) PLASTIC DFN TJMAX = 125C, JA = 102C/W, JC = 20C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH LTC3025EDC#PBF LTC3025IDC#PBF LEAD BASED FINISH LTC3025EDC LTC3025IDC TAPE AND REEL LTC3025EDC#TRPBF LTC3025IDC#TRPBF TAPE AND REEL LTC3025EDC#TR LTC3025IDC#TR PART MARKING* LBDY LBDY PART MARKING* LBDY LBDY PACKAGE DESCRIPTION 6-Lead (2mm x 2mm) Plastic DFN 6-Lead (2mm x 2mm) Plastic DFN PACKAGE DESCRIPTION 6-Lead (2mm x 2mm) Plastic DFN 6-Lead (2mm x 2mm) Plastic DFN TEMPERATURE RANGE -40C to 125C -40C to 125C TEMPERATURE RANGE -40C to 125C -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/
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 1.5V, VBIAS = 3.6V, VOUT = 1.2V, COUT = 1F CIN = 0.1F , , CBIAS = 0.1F (all capacitors ceramic) unless otherwise noted.
PARAMETER VIN Operating Voltage (Note 4) VBIAS Operating Voltage (Note 4) VBIAS Undervoltage Lockout VIN Operating Current VBIAS Operating Current VIN Shutdown Current VBIAS Shutdown Current VADJ Regulation Voltage (Note 5) IADJ ADJ Input Current OUT Load Regulation (Referred to ADJ Pin) VIN Line Regulation (Referred to ADJ Pin) IOUT = 10A IOUT = 10A VSHDN = 0V VSHDN = 0V 1mA IOUT 300mA, 1.5V VIN 5V 1mA IOUT 300mA, 1.5V VIN 5V VADJ = 0.45V IOUT = 1mA to 300mA VIN = 1.5V to 5V, VBIAS = 3.6V, VOUT = 1.2V, IOUT = 1mA
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
l l l l l
TYP
MAX 5.5 5.5
UNITS V V V A A A A V V nA mV mV
0.9 2.5 2.2 4 50 1 0.01 0.395 0.392 -50 0.4 0.4 0 -0.2 0.07
2.5 10 80 5 1 0.405 0.408 50
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LTC3025 ELECTRICAL CHARACTERISTICS
PARAMETER BIAS Line Regulation (Referred to ADJ Pin) VIN to VOUT Dropout Voltage (Notes 4, 6, 7) VBIAS to VOUT Dropout Voltage (Note 4) IOUT Continuous Output Current IOUT Current Limit en Output Voltage Noise VIH SHDN Input High Voltage VIL SHDN Input Low Voltage IIH SHDN Input High Current IL SHDN Input Low Current SHDN = 1.2V SHDN = 0V VADJ = 0V f = 10Hz to 100kHz, IOUT = 300mA
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The l denotes the specifications which apply over the full operating , , temperature range, otherwise specifications are at TA = 25C. VIN = 1.5V, VBIAS = 3.6V, VOUT = 1.2V, COUT = 1F CIN = 0.1F CBIAS = 0.1F (all capacitors ceramic) unless otherwise noted.
CONDITIONS VIN = 1.5V, VBIAS = 2.6V to 5V, VOUT = 1.2V IOUT = 1mA VBIAS = 2.8V, VIN = 1.5V, VADJ = 0.37V, IOUT = 300mA
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MIN
TYP 1.7 45
MAX 5.5 100 1.4
UNITS mV mV V mA mA VRMS V
300 680 80 0.9 0.3 -1 -1 1 1
V A 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: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 3: The LTC3025 regulator is tested and specified under pulse loadconditions such that TJ TA. The LTC3025 is 100% production tested at 25C. Performance at -40C and 125C is assured by design, characterization and correlation with statistical process control. The LTC3025I is guaranteed to meet performance specifications over the full -40C and 125C temperature range.
Note 4: For the LTC3025, a regulated output voltage will only be available when the minimum IN and BIAS Operating Voltages as well as the IN to OUT and BIAS to OUT Dropout Voltages are all satisfied. Note 5: 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 6: Dropout voltage is 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 7: The DFN output FET on-resistance in dropout is guaranteed by correlation to wafer level measurements.
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LTC3025 TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage vs IOUT
70 60 DROPOUT VOLTAGE (mV) 50 40 30 20 10 0 0 50 100 TA = -40C TA = 125C IBIAS (A) TA = 25C VBIAS = 2.8V 400 350 300 IBIAS (A) 250 125C 200 25C 150 -40C 100 50 200 150 IOUT (mA) 250 300
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Operating BIAS Current vs Output Load
80
BIAS No Load Operating Current
VIN = 1.5V 70 VOUT = 1.2V 60 50 40 30 20 10 125C -40C 25C
0 0.01
0.1
1
10 IOUT (mA)
100
1000
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0 2.5
3
3.5
4.5 4 VBIAS (V)
5
5.5
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VIN No Load Operating Current
14 12 10 IIN (A) 8 6 4 2 0 0.5 VBIAS = 5V VOUT = 0.8V 7 6 125C 85C 25C -40C 2 IIN (A) 5 4 3
VIN Shutdown Current
VBIAS = 5V 405 404 403 ADJUST VOLTAGE (mV) 402 401 400 399 398 397 396 1.5 2.5 3.5 4.5 5.5
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Adjust Voltage vs Temperature
VBIAS = 3.6V VIN = 1.5V IOUT = 10A
-40C
25C 85C 1 0 0.5
1.5
2.5
3.5
4.5
5.5
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395 -50
-25
VIN (V)
VIN (V)
50 25 0 75 TEMPERATURE (C)
100
125
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SHDN Threshold vs Temperature
1000 900 800 SHDN THRESHOLD (mV) 700 600 500 400 300 200 100 0 -50 -25 50 25 0 75 TEMPERATURE (C) 100 125 VBIAS = 2.5V VBIAS = 5V CURRENT LIMIT (mA) 1200 1000 800 600 400 200 0 1600
Current Limit vs VIN Voltage
VBIAS = 3.6V 1400 VOUT = 0V VIN AC 100mV/DIV
Burst Mode DC/DC Buck Ripple Rejection
VOUT AC 10mV/DIV
0
1
2
3 VIN (V)
4
5
6
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VIN = 1.8V VOUT = 1.5V COUT = 1F IOUT = 50mA
10s/DIV
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LTC3025 TYPICAL PERFORMANCE CHARACTERISTICS
VIN Ripple Rejection vs Frequency
70 60 50 40 COUT = 1mF 30 20 10 REJECTION (dB) COUT = 10F 70 60 50 40 30 COUT = 1mF 20 10 VBIAS = 3.6V VIN = 1.5V VOUT = 1.2V IOUT = 100mA 1k 10k 100k 1M 10M
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BIAS Ripple Rejection vs Frequenc
COUT = 10F
REJECTION (dB)
0 100
VBIAS = 3.6V VIN = 1.5V VOUT = 1.2V IOUT = 100mA 1k 10k 100k 1M 10M
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0 100
FREQUENCY (Hz)
FREQUENCY (Hz)
3MHz VIN Supply Rejection
50 45 40 REJECTION (dB) 35 30 25 20 15 10 5 VBIAS = 3.6V VOUT = 1.2V 0 1.2 1.4 1.6 IOUT = 100mA IOUT = 300mA 1.8 2.0 VIN (V) 2.2 2.4 2.6 VOUT AC 10mV/DIV COUT = 10F COUT = 1F 250mA IOUT 10mA
Transient Response
VIN = 1.5V VOUT = 1.2V VBIAS = 3.6V COUT = 1F
100s/DIV
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LTC3025 PIN FUNCTIONS
BIAS (Pin 1): BIAS Input Voltage. BIAS provides internal power for LTC3025 circuitry. The BIAS pin should be locally bypassed to ground if the LTC3025 is more than a few inches away from another source of bulk capacitance. In general, the output impedance of a battery rises with frequency, so it is usually advisable to include an input bypass capacitor in battery-powered circuits. A capacitor in the range of 0.01F to 0.1F is usually sufficient. GND (Pin 2): Ground. Connect to a ground plane. IN (Pin 3): Input Supply Voltage. The output load current is supplied directly from IN. The IN pin should be locally bypassed to ground if the LTC3025 is more than a few inches away from another source of bulk capacitance. In general, the output impedance of a battery rises with frequency, so it is usually advisable to include an input bypass capacitor when supplying IN from a battery. A capacitor in the range of 0.1F to 1F is usually sufficient. OUT (Pin 4): Regulated Output Voltage. The OUT pin supplies power to the load. A minimum ceramic output capacitor of at least 1F is required to ensure stability. Larger output capacitors may be required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more information on output capacitance. ADJ (Pin 5): Adjust Input. This is the input to the error amplifier. The ADJ pin reference voltage is 0.4V referenced to ground. The output voltage range is 0.4V to 3.6V and is typically set by connecting ADJ to a resistor divider from OUT to GND. See Figure 2. SHDN (Pin 6): Shutdown Input, Active Low. This pin is used to put the LTC3025 into shutdown. The SHDN pin current is typically less than 10nA. The SHDN pin cannot be left floating and must be tied to a valid logic level (such as BIAS) if not used. Exposed Pad (Pin 7): Ground and Heat Sink. Must be soldered to PCB ground plane or large pad for optimal thermal performance.
BLOCK DIAGRAM
1 BIAS
REFERENCE 6 SHDN SHDN 0.4V
SOFT-START
IN
+ -
6A OUT ADJ
3
2
GND
4 5
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LTC3025 APPLICATIONS INFORMATION
Operation (Refer to Block Diagram) The LTC3025 is a micropower, VLDO (very low dropout) linear regulator which operates from input voltages as low as 0.9V. The device provides a high accuracy output that is capable of supplying 300mA of output current with a typical dropout voltage of only 45mV. A single ceramic capacitor as small as 1F is all that is required for output bypassing. A low reference voltage allows the LTC3025 output to be programmed to much lower voltages than available in common LDOs (range of 0.4V to 3. 6V). As shown in the Block Diagram, the BIAS input supplies the internal reference and LDO circuitry while all output current comes directly from the IN input for high efficiency regulation. The low quiescent supply currents IIN = 4A, IBIAS = 50A drop to IIN = 1A, IBIAS = 0.01A typical in shutdown making the LTC3025 an ideal choice for use in battery-powered systems. The device includes current limit and thermal overload protection. The fast transient response of the follower output stage overcomes the traditional tradeoff between dropout voltage, quiescent current and load transient response inherent in most LDO regulator architectures. The LTC3025 also includes overshoot detection circuitry which brings the output back into regulation when going from heavy to light output loads (see Figure 1). Adjustable Output Voltage The output voltage is set by the ratio of two external resistors as shown in Figure 2. The device servos the output to maintain the ADJ pin voltage at 0.4V (referenced to ground). Thus the current in R1 is equal to 0.4V/R1. For good transient response, stability, and accuracy, the current in R1 should be at least 8A, thus the value of R1 should be no greater than 50k. The current in R2 is the current in R1 plus the ADJ pin bias current. Since the ADJ pin bias current is typically <10nA, it can be ignored in the output voltage calculation. The output voltage can be calculated using the formula in Figure 2. Note that in shutdown the output is turned off and the divider current will be zero once COUT is discharged. The LTC3025 operates at a relatively high gain of -0.7V/ mA referred to the ADJ input. Thus a load current change of 1mA to 300mA produces a -0.2mV drop at the ADJ input. To calculate the change referred to the output simply multiply by the gain of the feedback network (i. e. ,1 + R2/R1). For example, to program the output for 1.2V choose R2/R1 = 2. In this example, an output current change of 1mA to 300mA produces -0.2mV * (1 + 2) = 0.6mV drop at the output. Because the ADJ pin is relatively high impedance (depending on the resistor divider used) , stray capacitance at this pin should be minimized (<10pF) to prevent phase shift in the error amplifier loop. Additionally, special attention should be given to any stray capacitances that can couple external signals onto the ADJ pin producing undesirable output ripple. For optimum performance connect the ADJ pin to R1 and R2 with a short PCB trace and minimize all other stray capacitance to the ADJ pin.
OUT R2 ADJ VIN = 1.5V VOUT = 1.2V VBIAS = 3.6V COUT = 1F 100s/DIV
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300mA IOUT 0mA
VOUT AC 20mV/DIV
VOUT = 0.4V 1
()
R2 R1
COUT R1
GND
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Figure 1. LTC3025 Transient Response
Figure 2. Programming the LTC3025
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LTC3025 APPLICATIONS INFORMATION
Output Capacitance and Transient Response The LTC3025 is designed to be stable with a wide range of ceramic 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 0.05 or less is recommended to ensure stability. The LTC3025 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. Note that bypass capacitors used to decouple individual components powered by the LTC3025 will increase the effective output capacitor value. High ESR tantalum and electrolytic capacitors may be used, but a low ESR ceramic capacitor must be in parallel at the output. There is no minimum ESR or maximum capacitor size requirements. 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 Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are good for providing high capacitances in a small package, but exhibit large voltage and temperature coefficients as shown in Figures 3 and 4. When used with a 2V regulator, a 1F Y5V capacitor can lose as much as 75% of its intial capacitance over the operating temperature range. The X5R and X7R dielectrics result in
20 0 CHANGE IN VALUE (%) X5R -20 -40 -60 -80 -100 CHANGE IN VALUE (%) BOTH CAPACITORS ARE 1F, 10V, 0603 CASE SIZE
more stable characteristics and are usually 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. In all cases, the output capacitance should never drop below 0.4F or instability , or degraded performance may occur. Thermal Considerations The power handling capability of the device will be limited by the maximum rated junction temperature (125C). The power dissipated by the device will be the output current multiplied by the input/output voltage differential: (IOUT) (VIN - VOUT) Note that the BIAS current is less than 300A even under heavy loads, so its power consumption can be ignored for thermal calculations. The LTC3025 has internal thermal limiting designed to protect the device during momentary overload conditions. For continuous normal conditions, the maximum junction temperature rating of 125C 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. 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.
20 0 X5R -20 Y5V -40 -60 -80 BOTH CAPACITORS ARE 1F, 10V, 0603 CASE SIZE -100 -50 0 25 50 -25 TEMPERATURE (C)
Y5V
0
2
6 4 DC BIAS VOLTAGE (V)
8
10
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75
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Figure 3. Ceramic Capacitor DC Bias Characteristics
Figure 4. Ceramic Capacitor Temperature Characteristics
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LTC3025 APPLICATIONS INFORMATION
The LTC3025 2mm x 2mm DFN package is specified as having a junction-to-ambient thermal resistance of 102C/W, which assumes a minimal heat spreading copper plane. The actual thermal resistance can be reduced substantially by connecting the package directly to a good heat spreading ground plane. When soldered to 2500mm2 double-sided 1 oz. copper plane, the actual junction-to-ambient thermal resistance can be less than 60C/W. Calculating Junction Temperature Example: Given an output voltage of 1.2V, an input voltage of 1.8V to 3V, an output current range of 0mA to 100mA 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) where: IOUT(MAX) = 100mA VIN(MAX) = 3V So: P = 100mA(3V - 1.2V) = 0.18W Even under worst-case conditions, the LTC3025's BIAS pin power dissipation is only about 1mW, thus can be ignored. Assuming a junction-to-ambient thermal resistance of 102C/W, the junction temperature rise above ambient will be approximately equal to: 0.18W(102C/W) = 18.4C The maximum junction temperature will then be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or: T = 50C + 18.4C = 68.4C Short-Circuit/Thermal Protection The LTC3025 has built-in short-circuit current limiting as well as overtemperature protection. During short-circuit conditions, internal circuitry automatically limits the output current to approximately 600mA. At higher temperatures, or in cases where internal power dissipation causes excessive self heating on chip, the thermal shutdown circuitry will shut down the LDO when the junction temperature exceeds approximately 150C. It will re enable the LDO once the junction temperature drops back to approximately 140C. The LTC3025 will cycle in and out of thermal shutdown without latch-up or damage until the overstress condition is removed. Long term overstress (TJ > 125C) should be avoided as it can degrade the performance or shorten the life of the part. Soft-Start Operation The LTC3025 includes a soft-start feature to prevent excessive current flow during start-up. When the LDO is enabled, the soft-start circuitry gradually increases the LDO reference voltage from 0V to 0.4V over a period of about 600s. There is a short 700s delay from the time the part is enabled until the LDO output starts to rise. Figure 5 shows the start-up and shutdown output waveform.
SHDN ON OFF 1.2V
VOUT 200mV/DIV
0V TA = 25C VIN = 1.5V VBIAS = 3.6V COUT = 1F RLOAD = 4 500s/DIV
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Figure 5. Output Start-Up and Shutdown
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LTC3025 TYPICAL APPLICATION
High Efficiency 1.5V Step-Down Converter with Efficient 1.2V VLDO Output
OFF ON 0.1F VIN 2.7V TO 5.5V 4 CIN** 4.7F CER 1 VIN SW 3 2.2H* 3 IN 1 BIAS LTC3025 ADJ 5 40.2k OFF ON COUT+ 10F CER 6 SHDN GND 2
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OUT
4 80.6k 1F
VOUT = 1.2V IOUT 300mA
LTC3406-1.5 RUN VOUT GND 5
VOUT 1.5V 600mA
*MURATA LQH32CN2R2M33 **TAIYO YUDEN JMK212BJ475MG TAIYO YUDEN JMK316BJ106ML
Efficiency vs Output Current
100 90 EFFICIENCY (%) 80 VOUT = 1.2V 70 60 50 40 0.1 VOUT = 1.5V
1 10 100 OUTPUT CURRENT (mA)
1000
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LTC3025 PACKAGE DESCRIPTION
DC Package 6-Lead Plastic DFN (2mm x 2mm)
(Reference LTC DWG # 05-08-1703)
R = 0.115 TYP 0.56 0.05 (2 SIDES) 2.00 0.10 (4 SIDES) PIN 1 CHAMFER OF EXPOSED PAD 3 0.25 0.50 BSC 1.42 0.05 (2 SIDES) 0.05 0.200 REF 0.75 0.05 1 0.25 0.50 BSC 1.37 0.05 (2 SIDES) 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD
(DC6) DFN 1103
0.38 4 6
0.05
0.675 0.05 2.50 0.05 1.15 0.05 0.61 0.05 (2 SIDES)
PIN 1 BAR PACKAGE TOP MARK OUTLINE (SEE NOTE 6)
0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 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
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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.
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LTC3025 RELATED PARTS
PART NUMBER LT(R)1129 LT1175 DESCRIPTION 700mA, Micropower, LDO 500mA, Micropower, Negative LDO COMMENTS VIN: 4.2V to 30V, VOUT(MIN) = 3.75V, VDO = 0.40V, IQ = 50A, ISD < 16A, VOUT = Adj, 3.3V, 5V, DD, SOT-223, S8, TO-220, TSSOP20 Packages VIN: -20V to -4.3V, VOUT(MIN) = -3.8V, VDO = 0.50V, IQ = 45A, ISD < 10A, VOUT = Adj, -5V, DD, SOT-223, S8, N8 Packages. Guaranteed Voltage Tolerance and Line/Load Regulation VIN: -35V to -4.2V, VOUT(MIN) = -2.40V, VDO = 0.80V, IQ = 2.5mA, ISD < 1A, VOUT = Adj, TO-220 Package. Accurate Programmable Current Limit, Remote Sense VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 20A, ISD < 1A, VOUT = Adj, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V, 5V, ThinSOTTM Package. Low Noise < 20VRMSP-P, Stable with 1F Ceramic Capacitors VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 25A, ISD < 1A, VOUT = Adj, 2.5V, 3V, 3.3V, 5V, MS8 Package. Low Noise < 20VRMSP-P VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 30A, ISD < 1A, VOUT = 1.5, 1.8V, 2.5V, 3V, 3.3V, 5V, S8 Package. Low Noise < 20VRMSP-P VIN: 2.7V to 20V, VOUT(MIN) = 1.21V, VDO = 0.34V, IQ = 1mA, ISD < 1A, VOUT = 1.8V, 2.5V, 3.3V, DD, TO-220 Packages. Low Noise < 40VRMSP-P, "A" Version Stable with Ceramic Capacitors VIN: 1.6V to 6.5V, VOUT(MIN) = 1.25V, VDO = 0.08V, IQ = 40A, ISD < 1A, VOUT = Adj, 1.5V, 1.8V, 2.5V, 2.8V, 3.3V, ThinSOT Package. Low Noise < 30VRMSP-P, Stable with 1F Ceramic Capacitors VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.27V, IQ = 30A, ISD < 1A, VOUT = 1.5, 1.8V, 2.5V, 3V, 3.3V, 5V, MS8 Package. Low Noise < 20VRMSP-P VIN: 2.1V to 20V, VOUT(MIN) = 1.21V, VDO = 0.34V, IQ = 1mA, ISD < 1A, VOUT = 1.5V, 1.8V, 2.5V, 3.3V, DD, SOT-223, S8, TO-220 Packages. Low Noise < 40VRMSP-P, "A"Version Stable with Ceramic Capacitors VIN: -0.9V to -20V, VOUT(MIN) = -1.21V, VDO = 0.34V, IQ = 30A, ISD < 3A, VOUT = Adj, -5V, ThinSOT Package. Low Noise < 30VRMSP-P, Stable with Ceramic Capacitors VIN: 0.9V to 10V, VOUT(MIN) = 0.20V, VDO = 0.15V, IQ = 120A, ISD < 3A, VOUT = Adj, DFN, MS8 Package VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 40A, ISD < 1A, VOUT = Adj, DFN, MS Packages. Low Noise < 20VRMSP-P, Stable with 1F Ceramic Capacitors VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 60A, ISD < 1A, VOUT = Adj, DFN, TSSOP Packages. Low Noise < 20VRMSP-P, Stable with 1F Ceramic Capacitors
LT1185 LT1761
3A, Negative LDO 100mA, Low Noise Micropower, LDO
LT1762 LT1763 LT1764/LT1764A
150mA, Low Noise Micropower LDO 500mA, Low Noise Micropower LDO 3A, Low Noise, Fast Transient Response, LDO
LTC1844
150mA, Very Low Dropout LDO
LT1962 LT1963/LT1963A
300mA, Low Noise Micropower LDO 1.5A, Low Noise, Fast Transient Response, LDO
LT1964
200mA, Low Noise Micropower, Negative LDO
LT3020 LT3023
100mA, Low Voltage, VLDO Dual, 2 x 100mA, Low Noise Micropower, LDO
LT3024
Dual 100mA/500mA, Low Noise Micropower, LDO
ThinSOT is a trademark of Linear Technology Corporation.
3025fb
12 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
LT 0908 REV B * PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2004

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