Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR2126
CMOS IC
1A FAST ULTRA LOW
DROPOUT LINEAR
REGULATOR

DESCRIPTION
The UTC LR2126 operate from a +2.5V ~ +6.0V input supply as
fast ultra low-dropout linear regulators. Wide output voltage range
options are available. The fast response characteristic to make
UTC LR2126 suitable for low voltage microprocessor application.
The low quiescent current operation and low dropout quality
caused by the CMOS process.
The UTC LR2126 has ultra low dropout voltage
300mV at 1A load current typically.
The ground pin current is typically 60uA at 1mA load current.
Output Voltage Precision: Multiple output voltage options are
available and ranging from 1.2V ~ 5.0V at room temperature with a
guaranteed accuracy of ±1.5%, and ±3.0% when varying line, load
and temperature.

FEATURES
* Ultra Low Dropout Voltage
* Low Ground Pin Current
* 0.04% Load Regulation
* The Guaranteed Output Current is 1A DC
* Output Voltage Accuracy ± 1.5%
* Low Output Capacitor Required
* Over temperature Protection And Over current Protection

ORDERING INFORMATION
Ordering Number
LR2126G-xx-AB5-R
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Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOT-89-5
Packing
Tape Reel
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LR2126
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CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
SOT89-5
AD: ADJ

PIN ASSIGNMENTS

PIN DESCRIPTION
PIN NO
MARKING
PIN NAME
DESCRIPTION
Shutdown LR2126 enable; when the EN pin connects to GND will shutdown
1
EN
the LR2126; At normal operation, EN must be tied to VDD through a 10KΩ pull
up resistor.
2
GND
Ground.
Adjustable voltage version only – a resistor divider from this pin to the OUT pin
3
ADJ
and ground sets the output voltage.
4
IN
Input voltage.
5
OUT
Output voltage.
Note: The NC pin is electrically open.
The NC pin can be connected to VIN or GND.
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LR2126

CMOS IC
BLOCK DIAGRAM
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LR2126

CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage (Operating)
2.5~7.0
V
VIN
-0.3~+7.5
V
Input Voltage (Survival)
Shutdown Input Voltage
VIN(SHDN)
-0.3~VIN+0.3
V
Output Voltage (Survival), (Note 1, 2)
VOUT
-0.3~+7.5
V
IOUT (Survival)
Short Circuit Protected
Maximum Operating Current (DC)
1
A
Power Dissipation (Note 3)
PD
Internally Limited
Junction Temperature
TJ
+125
°C
Operating Temperature
TOPR
-40~+125
°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
Junction to Ambient

SYMBOL
θJA
RATINGS
160
UNIT
°C/W
ELECTRICAL CHARACTERISTICS
TJ = 25°C, VIN = VOUT(NOM) + 1V, IOUT = 10mA, CIN = 4.7μF ,COUT = 4.7μF, VEN = VIN-0.3V, unless otherwise
specified.(Note 4)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
+1.5
0mA ≤ IOUT ≤ 1A
-1.5
%
0
Output Voltage Tolerance (Note 5)
VOUT
+3
VOUT +1 ≤ VIN≤ 6.0V
-3
Output Voltage Line Regulation (Note 5)
△VOUT
VOUT+1V<VIN<6.0V
0.05
%
Output Voltage Load Regulation (Note 5) △VOUT/△IOUT 10mA < IOUT < 1A
0.5
%
Dropout Voltage (Note 6)
VD
IOUT = 1A
300
500
mV
FB Reference Voltage
VREF
IOUT=10mA
0.8
V
Ground Pin Current In Normal Operation
IOUT = 0mA
60
IGND
μA
Mode
IOUT = 1A
70
Start-Up Time
tST
VOUT=3V,RL=30Ω
100
μs
SHORT CIRCUIT PROTECTION
Short Circuit Current
ISC
2
A
OVER TEMPERATURE PROTECTION
Shutdown Threshold
TSHDN(THR)
165
°C
Thermal Shutdown Hysteresis
TSHDN(HYS)
10
°C
SHUTDOWN INPUT
Output = High
VIN-0.3 VIN
Shutdown Threshold
VEN
V
Output = Low
0
0.3
EN Input Current
IEN
VEN = VIN
10
nA
AC PARAMETERS
VIN = VOUT + 1.5V
60
COUT=100uF, VOUT = 3.3V
Ripple Rejection
PSRR
dB
VIN = VOUT + 0.3V
40
COUT=100uF, VOUT = 3.3V
Output Noise Density
ρN(L/F)
f = 120Hz
0.8
μV
BW = 10Hz ~ 100kHz
150
Output Noise Voltage
eN
μVRMS
BW = 300Hz ~ 300kHz
100
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LR2126
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CMOS IC
ELECTRICAL CHARACTERISTICS(Cont.)
Notes: 1. The LR2126 output must be diode-clamped to ground. If used in a dual-supply system where the regulator
load is returned to a negative supply.
2. Between the VIN and VOUT terminals the output PMOS structure contains a diode. This diode is reverse
biased normally. If the voltage at the output terminal is forced to be higher than the voltage at the input terminal
this diode will get forward biased. This diode can withstand 1Amp of peak current and 200mA of DC current
typically.
3. Devices must be derated based on package thermal resistance at elevated temperatures.
4. Conditions for which the device is intended to be functional is indicated by operating ratings, but specific
performance limits isn’t be guaranteed. To make sure of specifications and test conditions, read Electrical
Characteristics. Only for the test conditions listed the guaranteed specifications can be applied. When the
device is not operated under the listed test conditions some performance characteristics may degrade.
5. Output voltage line regulation is the change in output voltage from the nominal value which is due to
change in the input line voltage. Which is defined as the change in output voltage from the nominal value
due to change in load current is output voltage load regulation. The load regulation and line regulation
specification include the typical number only. But, the limits for load and line regulation are included in the
output voltage tolerance specification.
6. At which the output drops 2% below the normal value dropout voltage is defined as the minimum input to
output differential voltage. Only to output voltages of 2.5V and above dropout voltage specification applies.
For output voltages below 2.5V, since the minimum input voltage is 2.5V, the drop-out voltage is nothing
but the input to output differential.
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LR2126
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CMOS IC
TYPICAL APPLICATION CIRCUIT
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LR2126
CMOS IC
TYPICAL CHARACTERISTICS
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Dropout Voltage vs. Output Current
Dropout Voltage, VD (mV)
350
300
250
200
150
100
50
0
0
250
500
750
1000
Output Current, IOUT (mA)
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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