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MIC5325
Low VIN/VOUT 400mA ULDOTM with Ultra-Low IQ
General Description
The MIC5325 is a high performance, Cap low dropout regulator, offering ultra-low operating current while maintaining very fast transient response. The MIC5325 can source up to 400mA of output current and allows a low input supply voltage source to increase system efficiency. Ideal for battery operated applications; the MIC5325 offers high accuracy, extremely low dropout voltage, and low ground current at all load conditions. The MIC5325 can also be put into a zero-off-mode current state, drawing virtually no current when disabled. The MIC5325 is available in fixed output voltages in the 6-pin 2mm x 2mm Thin MLF(R) leadless package. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * * * * Wide input voltage range: 1.7V to 5.5V Stable with 1F ceramic output capacitor Ultra-low dropout voltage ULDOTM 110mV @ 400mA 2% voltage accuracy over temperature Bias supply voltage range: 2.5V to 5.5V Adjustable output voltage range: 0.8V to 2.0V Ultra-low ground current 35A typical 400mA maximum output current per LDO Very fast transient response Thermal shutdown and current limit protection Tiny 6-pin 2mm x 2mm Thin MLF(R) package
Applications
* * * * Low power handheld devices Portable electronics GPS receivers Post regulator
___________________________________________________________________________________________________________
Typical Application
MIC5325-xxYMT VBIAS
MIC23050 High Efficiency DC-to-DC Buck
VIN EN CBIAS 1F CIN 1F GND
VOUT
Li-ion 2.7...4.2V
BYP CBYP 10nF COUT 1F
ULDO is a trademark of Micrel, Inc MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
April 2008
M9999-040308-A
Micrel, Inc.
MIC5325
Ordering Information
Part Number MIC5325-1.2YMT MIC5325-1.5YMT MIC5325-1.8YMT
Note: 1. 2. 3. Other voltages available. Contact Micrel for details. Contact Marketing for ADJ version availability. = Pin 1 identifier.
Marking QG4 QGF QGG
Voltage 1.2V 1.5V 1.8V
Temperature Range -40 to +125C -40 to +125C -40 to +125C
Package 6-Pin 2mm x 2mm Thin MLF(R) 6-Pin 2mm x 2mm Thin MLF 6-Pin 2mm x 2mm Thin MLF
(R) (R)
Lead Finish Pb-Free Pb-Free Pb-Free
Pin Configuration
VBIAS 1 GND 2 IN 3
6 5 4
EN BYP/ADJ OUT
6-Pin 2mm x 2mm Thin MLF(R) (MT)
Pin Description
Pin Number
1 2 3 4 5
Pin Name
VBIAS GND IN OUT BYP/ADJ
Pin Function
Bias Input Voltage. Ground Power Input for LDO. Output of regulator. Bypass: Connect a capacitor to ground to reduce noise and reduce ripple rejection. Adjust: Feedback input from external resistor divider. Enable Input: Active High Input. Logic High = On; Logic Low = Off; Do not leave floating.
6
EN
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MIC5325
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ............................................ 0V to VBIAS Bias Voltage (VBIAS). ............................................... 0V to 6V Enable Voltage (VEN)........................................... 0V to VBIAS Power Dissipation (PD) ........................... Internally Limited(3) Lead Temperature (soldering, 10 sec.).................... 260C Storage Temperature (Ts) .........................-65C to +150C ESD Rating(4) .................................................................. 2kV
Operating Ratings(2)
Supply Voltage (VIN)......................................... 1.7V to VBIAS Bias Voltage (VBIAS).......................................... 2.5V to 5.5V Enable Voltage (VEN)........................................... 0V to VBIAS Junction Temperature (TJ) ........................ -40C to +125C Junction Thermal Resistance 2x2 Thin MLF-6 (JA) .........................................90C/W
Electrical Characteristics(5)
VBIAS = 3.6V; VIN = VOUT + 1V; COUT = 1F; IOUT = 100A; TJ = 25C, bold values indicate -40C to +125C, unless noted.
Parameter
Output Voltage Accuracy Reference Voltage VBIAS Line Regulation VIN Line Regulation Load Regulation VIN Dropout Voltage Ground Pin Current Ground Pin Current in Shutdown Ripple Rejection
Condition
Variation from nominal VOUT ADJ pin voltage VBIAS = 3.6V to 5.5V, VIN = VOUT +1V VBIAS = 3.6V to 5.5V, VIN = VOUT +1V to 5.5V IOUT = 100A to 400mA IOUT = 400mA IOUT = 100A to 400mA, VIN = VEN, VBIAS = 5.5V VEN 0.2V f = up to 1kHz; COUT = 1.0F; no CBYP f = up to 1kHz; COUT = 1.0F; CBYP = 10nF f = 1kHz - 20kHz; COUT = 1.0uF; CBYP = 10nF
Min -2.0 0.7595
Typ
0.775 0.03 0.02 0.3 110 35 0.01 60
Max +2.0 0.7905 0.6 0.6 2 250 55
1
Units
% V %/V %/V % mV A A dB dB dB mA VRMS
50 450
65 40 680 30
Current Limit Output Voltage Noise
VOUT = 0V COUT = 1F, CBYP = 10nF, 10Hz to 100kHz Logic Low Logic High
Enable Inputs (EN)
Enable Input Voltage Enable Input Current Turn-on Time
Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 5. Specification for packaged product only.
0.2 1.2
0.01 0.02 150
V V A A
VIL 0.2V VIH 1.0V COUT = 1F; CBYP = 10nF
500
s
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MIC5325
Typical Characteristics
-120 -100 -80 -60 -40 400mA
Power Supply Rejection Ratio (VIN)
100mA 50mA 100A (NO BYP) 100A
-120 -100 -80
Power Supply Rejection Ratio (V BIAS)
100A 100A (NO BYP)
10 9 8 7 6 5 4 3 2
Ground Current (V IN) vs. VIN
-60 -40 VIN = VOUT +1V -20 VOUT = 1.2V COUT = 1F 400mA CBYP = 0.01F 0 0.1 1 10 100 FREQUENCY (kHz)
VIN = VOUT +1V 300mA -20 VOUT = 1.2V COUT = 1F CBYP = 0.01F 0 0.1 1 10 100 FREQUENCY (kHz)
1,000
1,000
1 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V)
VBIAS = 5.5V VOUT = 1.8V COUT = 1F CBYP = 0.01F
10 9 8 7 6 5 4 3 2 1 0 0
Ground Current (V IN) vs. Output Current
18 16 14 12 10 8 6
Ground Current (V BIAS) vs. Output Current
30 28 26 24 22 20 18
Ground Current (Total) vs. Output Current
VIN = 2.8V VOUT = 1.8V COUT = 1F CBYP = 0.01F
4 2 0 0
VBIAS = 3.6V VIN = 2.8V VOUT = 1.8V COUT = 1F CBYP = 0.01F
16 14 12 10 0
50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA)
50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA)
50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA)
2.0 100A 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2
Output Voltage vs. VIN
140 120
Dropout Voltage vs. Temperature
140 120
Dropout Voltage vs. Output Current
400mA
400mA
100 80 60
200mA
100 80 60 40
100mA
40
VBIAS = 5.5V VOUT = 1.8V COUT = 1F
20
20 0 0
0 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V)
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
VBIAS = 3.6V VIN = 2.8V COUT = 1F CBYP = 0.01F CBAIS = 1F CIN = 1F
50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA)
20 18 16 14 12 10 8 6 4 2
Ground Current (V IN) vs. Temperature
100A 400mA
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
VBIAS = 3.6V VIN = 2.8V VOUT = 1.8V
900 875 850 825 800 775 750 725 700 VBIAS = 5.5V 675 VOUT = 1.8V 650 COUT = 1F 625 CIN = 1F 600 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V)
Current Limit vs. VIN
1.8
Output Voltage vs. Output Current
1.75
1.7
VBIAS = 3.6V VIN = 2.8V COUT = 1F CBYP = 0.01F CIN = 1F
1.65
1.6 0
50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA)
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MIC5325
Typical Characteristics (continued)
1.30
Output Voltage vs. Temperature
0.900 0.875
Reference Voltage vs. Temperature
VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1F IOUT = 100A
20 18 16 14 12 10 8 6 4 2
Bias Current vs. Enable Voltage
400mA
1.25
0.850 0.825
1.20
VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1F I OUT = 100A
0.800 0.775 0.750 0.725 0.700 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
100A VBIAS = 3.6V VIN = 2.8V VOUT = 1.8V CIN = 1F COUT = 1F CBYP = 0.01F
1.15
1.10 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 ENABLE VOLTAGE (V)
10
Output Noise Spectral Density
VIN = 4.5V VOUT = 1.8V COUT = 1F CBYP = 0.01F
1
0.1
0.01 10
Noise (10Hz to 1MHz) = 59V RMS
100 1K 10K 100K FREQUENCY (Hz)
1M
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MIC5325
Functional Characteristics
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MIC5325
Functional Diagram
VBIAS
CURRENT LIMIT
VIN EN
LDO
VOUT
REFERENCE
QUICK START
BYP
THERMAL LIMIT
GND
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MIC5325
Bypass Capacitor A capacitor can be placed from the noise bypass pin-toground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.01F capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5325 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Minimum Load Current The MIC5325, unlike most other regulators, does not require a minimum load to maintain output voltage regulation. Enable/Shutdown The MIC5325 comes with a single active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a "zero" off-mode-current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Thermal Considerations The MIC5325 is designed to provide 400mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 1.8V, the output voltage is 1.2V and the output current = 400mA. The actual power dissipation of the regulator circuit can be determined using the equation:
Application Information
The MIC5325 is a high performance, low-dropout linear regulator designed for low current applications requiring fast transient response. The MIC5325 utilizes two input supplies, significantly reducing dropout voltage, perfect for low-voltage, DC-to-DC conversion. The MIC5325 requires a minimum of external components. The MIC5325 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown.
Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC5325. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. 1F ceramic capacitor from VBIAS-to-ground helps reduce high frequency noise from being injected into the control circuitry from the bias rail and is good design practice. Input Supply Voltage VIN provides the supply to power the LDO. The minimum input voltage is 1.7V, allowing conversion from low voltage supplies. Output Capacitor The MIC5325 requires an output capacitor of 1F or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1F ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7Rtype capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. Input Capacitor The MIC5325 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1F capacitor is required from the input-to-ground to provide stability. LowESR ceramic capacitors provide optimal performance at a minimum of space. Additional high-frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit.
PD = (VIN - VOUT1) I OUT + VIN IGND Because this device is CMOS and the ground current is typically <100A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (1.8V - 1.2V) x 400mA PD = 0.18W To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation:
TJ(max) - TA PD(max) = JA
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 90C/W.
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MIC5325
R3 10k
J1 VBIAS J2 GND J3 VIN
VBIAS
U1 MIC5325-YMT
VBIAS C1 1F/6.3V GND BYP/ADJ C2 1F/6.3V VIN VOUT C4 1F/6.3V EN C3 0.01F/6.3V
VOUT
J6 EN
VIN
J4 VO J5 GND
Bill of Materials
Item
C1, C2, C4 C3 R3
Part Number
VJ0603G105KXYCW1BC VJ0603Y103KXQCW1BC CRCW060310K0FKEA
Manufacturer
Vishay
(1) (2) (1)
Description
Capacitor, 1F, 6.3V, Size 0603 Capacitor, 0.01F, 10V, Size 0603 Resistor, 10k, 1%, 1/16W, Size 0603
Qty.
3 1 1
Murata
Vishay Dale
U1
Notes:
MIC5325-xxYMT
Micrel, Inc.
(3)
400mA ULDOTM with Ultra Low IQ
1
1. Vishay: www.vishay.com 2. Murata: www.murata.com 3. Micrel, Inc.: www.micrel.com
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MIC5325
PCB Layout Recommendations
Top Layer
Bottom Layer
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MIC5325
Package Information
6-Pin 2mm x 2mm Thin MLF(R) (MT)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2007 Micrel, Incorporated.
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