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UNISONIC TECHNOLOGIES CO., LTD L11815A
1.5A CMOS LDO
DESCRIPTION
The UTC L11815A is a COMS linear regulator. One of it's feature is very low quiescent current typical as low as 45A and its dropout voltage is extremely low with 1.5A output current. The internal circuit includes thermal shutdown and current fold-back mechanism to prevent device failure when the circuit is operated in the bad conditions. In application, the UTC L11815A needs a low noise, regulated supply. For stable operation, the output capacitance value should be 4.7F or more. The UTC L11815A is an ideal for battery applications, such as instrumentations, portable electronics, wireless devices, PC peripherals, and battery powered widgets. The output voltage values are set during manufacturing and the accuracy is tighten 1.5%.
Preliminary
CMOS IC
FEATURES
* Quiescent current (45A typ.) * Very Low Dropout Voltage * Guaranteed 1.5A output * Accuracy : 1.5% * Over-temperature shut down * With current limiting * Short circuit current fold-back * Low temperature coefficient * Halogen-free
ORDERING INFORMATION
Ordering Number Package Pin Assignment 1 2 3 I G O Packing Tape Reel
L11815AG-xx-AA3-D-R SOT-223 Note: Pin Assignment: G:GND O:VOUT I:VIN xx: Output Voltage, refer to Marking Information.
www.unisonic.com.tw Copyright (c) 2009 Unisonic Technologies Co., Ltd
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MARKING INFORMATION
PACKAGE VOLTAGE CODE
Preliminary
CMOS IC
MARKING
SOT-223
19: 1.9V 28: 2.8V
PIN CONFIGURATION
1 VIN
2 GND
3 VOUT
PIN DESCRIPTION
PIN NO. 1 2 3 PIN NAME VIN GND VOUT DESCRIPTION Input voltage pin. It should be decoupled with 1F or greater capacitor. Ground connection pin. LDO voltage regulator output pin. It should be decoupled with a 4.7F or greater value low ESR ceramic capacitor.
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www.unisonic.com.tw
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L11815A
BLOCK DIAGRAM
Preliminary
CMOS IC
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L11815A
PARAMETER Input Voltage Output Voltage
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
RATINGS UNIT -0.3 ~ +8 V GND - 0.3 ~ VIN + 0.3 V PD Output Current IOUT mA VIN - VOUT Power Dissipation PD 900 mW Junction Temperature TJ 150 C Operating Temperature TOPR - 40~ 85 C Storage Temperature TSTG - 65~+150 C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. SYMBOL VIN VOUT
THERMAL DATA
PARAMETER Junction to Ambient Junction to Case (Note) Note: JC on center of molding compound if IC has on tab SYMBOL JA JC MIN TYP MAX 120 25 UNIT C/W C/W
ELECTRICAL CHARACTERISTICS (VIN = VO(Nom) +2V , Ta = 25C, unless otherwise specified.)
PARAMETER Input Voltage Output Voltage Accuracy Line Regulation Load Regulation Output Current Current Limit Short Circuit Current Quiescent Current Ground Pin Current Dropout Voltage Over Temperature Shutdown Over Temperature Hysteresis Temperature Coefficient of Output Voltage Power Supply Rejection Output Voltage Noise Note: VIN(MIN)=VOUT+VD SYMBOL VIN VOUT VOUT VOUT VOUT VOUT IOUT ILIMIT ISC IQ IGND VD OTS OTH TCVO PSRR eN f=100Hz IOUT=100mA, CO=4.7F f=1kHz f=10kHz f=10Hz ~ 100kHz, IOUT=10mA, Co=4.7F TEST CONDITIONS IO=1mA IOUT=1mA VIN=VOUT+1~VOUT+2 IOUT=1mA ~ 1500mA MIN Note -1.5 -0.15 -0.1 -1 1500 1500 VIN= VO(NOM)+1V, VOUT<0.4V IOUT=0mA IOUT=1mA ~ 1500mA IOUT=1.5A VO(NOM)2.0V VOUT=VO(NOM)-2.0% VO(NOM)>2.0V TYP MAX 7 1.5 0.15 0.1 1 UNIT V % % % % mA mA mA A A mV mV C C ppm/C dB dB dB Vrms
VOUT<2.0V VOUT2.0V
0.02 0.2 2000 750 45 45
70 1300 800
150 30 30 70 50 20 30
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www.unisonic.com.tw
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DETAILED DESCRIPATION
Preliminary
CMOS IC
The UTC L11815A of CMOS regulators insist of a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. The error amplifier, over-current shutdown, and thermal protection circuits provides data for P-channel pass transistor. The error amplifier takes output voltage for a precision reference in the normal operation and the normal operation is restored when the junction temperature drops below 120C.Over-current and Thermal shutdown circuits start to work when the junction temperature is higher than 150 C, or the current exceeds 2.2A. The output voltage stays low when the thermal shutdown is in active. The UTC L11815A behaves like a current source when the load reaches 2.2A. But the current would fall back to 600mA to prevent excessive power loss when the load impedance value is below 0.3.Normal operation is restored when the load resistance value is higher than 0.75 .
EXTERNAL CAPACITORS
The UTC L11815A has an output capacitor to ground of 4.7F or more in the stable operation. Ceramic capacitors can provide the lowest ESR with the best AC performance. Aluminum Electrolytic capacitors, in contrast, have the highest ESR with poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. So we can parallel a 0.1F ceramic capacitor with a 10F Aluminum Electrolytic. The result is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize input voltage. To get an ideal effect the value of the input capacitor should be at least 0.1F. All capacitors should be placed in close proximity to the pins. This can be achieved with a star connection.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
VIN VOUT
VIN
L11815A GND
VOUT
C1=1F
C2=4.7F
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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www.unisonic.com.tw
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