UNISONIC TECHNOLOGIES CO., LTD
L11815A CMOS IC
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Copyright © 2012 Unisonic Technologies Co., Ltd QW-R502-346.G
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 45μA 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 4.7μF or more.
The UTC L118 15A 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%.
FEATURES
* Quiescent Current (45μA typ.)
* Very Low Dropout Voltage
* Guaranteed 1.5A output
* Accuracy : ±1.5%
* Over-Temperature ShutDown
* With Current Limiting
* Short Circuit Current Fold-Back
* Low Temperature Coefficient
ORDERING INFORMATION
Ordering Number Package Pin Assignment Packing
Lead Free Halogen Free
L11815AL-xx-AA3-x-R L11815AG-xx-AA3-x-R SOT-223
A: GOI
D: IGO
Tape Reel
L11815AL-xx-TA3-x-R L11815AG-xx-TA3-x-R TO-220 Tube
L11815AL-xx-TN3-x-R L11815AG-xx-TN3-x-R TO-252 Tape Reel
L11815AL-xx-TN3-x-T L11815AG-xx-TN3-x-T TO-252 Tube
L11815AL-xx-TQ2-x-R L11815AG-xx-TQ2-x-R TO-263 Tape Reel
L11815AL-xx-TQ2-x-T L11815AG-xx-TQ2-x-T TO-263 Tube
Note: Pin Assignment: G:GND O:VOUT I:V
IN
xx: Output Voltage, refer to Marking Information.
L11815A CMOS IC
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MARKING INFORMATION
PACKAGE VOLTAGE CODE MARKING
SOT-223 15: 1.5V
19: 1.9V
25: 2.5V
28: 2.8V
33: 3.3V
123
Date Code
Voltage Code
Pin Code G: Halogen Free
L: Lead Free
L11815A
XX
TO-252
TO-263
TO-220
UTC
L11815A
XX Date Code
Lot Code
L: Lead Free
G: Halogen Free
Voltage Code
Pin Code
BLOCK DIAGRAM
L11815A CMOS IC
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www.unisonic.com.tw QW-R502-346.G
ABSOLUTE MAXIMUM RATING
PARAMETER SYMBOL RATINGS UNIT
Input Voltage VIN -0.3 ~ +8 V
Output Voltage VOUT GND - 0.3 ~ VIN + 0.3 V
Power Dissipation PD Internally limited
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.
THERMAL DATA
PARAMETER SYMBOL RATINGS UNIT
Junction to Ambient
SOT-223
θJA
140
°C/W TO-220/ TO-263 62.5
TO-252 103
Junction to Case
SOT-223
θJC
15
°C/W TO-220/ TO-263 4
TO-252 12
ELECTRICAL CHARACTERISTICS (VIN = VO(Nom) +2V, TA = 25°C, unless otherwise specified.)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Input Voltage VIN Note 7 V
Output Voltage Accuracy VOUT I
O=1mA -1.5 1.5 %
Line Regulation OUT
OUT
V
VΔ IOUT=1mA
VIN=VOUT+1~ VOUT+2
VOUT<2.0V -0.15 0.15 %
VOUT≥2.0V -0.1 0.02 0.1 %
Load Regulation OUT
OUT
V
VΔ IOUT=1mA ~ 1500mA -1 0.2 1 %
Output Current IOUT 1500 mA
Current Limit ILIMIT 1500 2000 mA
Short Circuit Current ISC V
IN= VO
(
NOM
)
+1V, VOUT<0.4V 750 mA
Quiescent Current IQ I
OUT=0mA 45 70 µA
Ground Pin Current IGND I
OUT=1mA ~ 1500mA 45 µA
Dropout Voltage VD IOUT=1.5A
VOUT=VO
(
NOM
)
-2.0%
VO
(
NOM
)
≤2.0V 1300 mV
VO
(
NOM
)
>2.0V 800 mV
Over Temperature Shutdown OTS 150 °C
Over Temperature Hysteresis OTH 30 °C
Temperature Coefficient of
Output Voltage TCVO 30 ppm/°C
Power Supply Rejection PSRR IOUT=100mA, CO=4.7µF
f=100Hz 70 dB
f=1kHz 50 dB
f=10kHz 20 dB
Output Voltage Noise eN f=10Hz ~ 100kHz, IOUT=10mA, Co=4.7µF 30 µVRMS
Note: VIN
(
MIN
)
=VOUT+VD
L11815A CMOS IC
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DETAILED DE SCRIPATION
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 120°C.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 0.3Ω.Normal operation is restored
when the load resistance value is higher than 0.75 Ω.
EXTERNAL CAPACITORS
The UTC L11815A has an output capacitor to ground of 4.7μF 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 0.1μF ceramic capacitor with a 10μF 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 0.1μF.
All capacitors should be placed in close proximity to the pins. This can be achieved with a star connection.
TYPICAL APPLICATION CIRCUIT
L11815A
GND
VIN VOUT
VIN VOUT
C1=1µF C2=4.7µF
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.
