Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR1125
CMOS IC
500mA, LOW-VOLTAGE
LINEAR REGULATOR
„
DESCRIPTION
The UTC LR1125 is a positive LDO (voltage linear regulator)
operates from a 2.25V ~ 5.5V supply and delivers a guaranteed
500mA load current with low 175mV dropout. Low dropout voltage
and large output current can be provided by built-in low
on-resistance transistor. Because an internal PMOS pass transistor
allows low 210µA supply current, the LR1125 can be ideal for
portable equipment such as PDAs, cellular phones, cordless
phones, and other equipments including base stations and docking
stations. It also includes an active-low, power-OK output that mean
a 0.02µA shutdown mode, short-circuit protection and
thermal-shutdown protection when the output is out of regulation.
„
FEATURES
* Low Dropout : 175mV Dropout at 500mA
* High accuracy output voltage: +/- 1.5%
* Guaranteed Output:500mA
* Thermal-Overload Protection
* Internal Current Limiting
* Low 210µA Ground Current
* 0.02µA Shutdown Current
* VOUT Can Be Adjusted From 0.8V ~ 4.5V
„
ORDERING INFORMATION
Ordering Number
LR1125G-S08-R
LR1125G-SM1-R
Package
SOP-8
MSOP-8
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
Packing
Tape Reel
Tape Reel
1 of 7
QW-R502-416.A
LR1125
CMOS IC
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PIN CONFIGURATION
„
PIN DESCRIPTION
PIN NO
PIN NAME
1, 2
IN
3
POK
4
SHDN
5
GND
6
SET
7, 8
OUT
DESCRIPTION
Input. Supply voltage: 2.25V ~ 5.5V. Bypass with a 1µF capacitor to GND. Connect
both input pins together.
Open-Drain, Active-Low Power-OK Output. While the output voltage (VOUT) is below
the POK threshold, this pin remains low. Connect a 100kΩpullup resistor to OUT.
Active-Low Shutdown Input. At this pin, a logic low reduces supply current to 0.02µA.
In shutdown, the POK output is low. For normal operation Connect SHDN to IN.
Ground.
Voltage-Setting Input. For preset output, connect this pin to GND. Connect an external
resistive voltage-divider from OUT to this pin to set the output voltage from 0.8V to
4.5V. This pin regulation voltage is 800mV.
Regulator Output (up to 500mA). This pin should be bypassed with a 10µF low-ESR
capacitor to GND. Connect both OUT pins together.
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LR1125
„
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
IN, SHDN, POK, SET to GND
-0.3~+6
V
OUT to GND
-0.3~(VIN+0.3)
V
Output Short-Circuit Duration
ID
continuous
Power Dissipation (Ta=70°C)
PD
1.95
W
Junction Temperature
TJ
+150
°C
Operating Temperature
TOPR
-40~+85
°C
Storage Temperature Range
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.
„
ELECTRICAL CHARACTERISTICS (VIN=VOUT(SETPOINT)+500mV or VIN=2.25V which is greater,
SET=GND, SHDN=IN, unless otherwise specified. Typical values are at Ta=25°C)
Ta=0°C~85°C
PARAMETER
Input Voltage
Input Undervoltage Lockout
Output Voltage Accuracy (Preset
Mode)
SYMBOL
TEST CONDITIONS
VIN
VUVLO
Rising, 40mV hysteresis
IOUT=100mA
IOUT=1mA ~ 500mA
VOUT
Ta=0°C ~85°C, IOUT=1mA~500mA,
VIN>VOUT+0.5V
Adjustable Output Voltage
SET Voltage Threshold (Adjustable
Mode)
Maximum Output Current
Short-Circuit Current Limit
SET Dual Mode Threshold
SET Input Bias Current
VSET
IOUT
ILIMIT
ISET
Ground-Pin Current
IQ
Dropout Voltage (Note 1)
VD
Line Regulation
∆VLNR
Load Regulation
Output Voltage Noise
SHUTDOWN
Shutdown Supply Current
∆VLDR
SHDN
Input Threshold
SHDN
Input Bias Current
Startup Time
IOFF
VIH
VIL
I SHDN
tSTART
IOUT=100mA
IOUT=1mA ~ 500mA
Ta=0°C ~85°C, IOUT=1mA~500mA,
VIN>VOUT+ 0.5V
VOUT=0V
VSET=0.8V
IOUT=1mA
IOUT=500mA
IOUT= 500mA, VOUT=2.25V
IOUT= 500mA, VOUT=2.8V
IOUT= 500mA, VOUT=4V
VIN from (VOUT+100mV)~5.5V,
ILOAD=5mA
IOUT=1mA ~500mA
10Hz~1MHz, CO=10µF(ESR<0.1Ω)
TYP
2
MAX
5.50
2.15
+1.5
+2.5
-3
+3
0.8
788
780
4.5
812
820
774
800
500
600 1400
35
80
-100
210
575
259
201
147
UNIT
V
V
%
V
mV
826
mA
2300
125
+100
600
mA
mV
nA
µA
400
350
275
mV
0
0.125
%/V
15.5
300
35
ppm/mA
0.02
5
SHDN = GND or IN
10
0.6
100
CO=10µF,time from SHDN high to
POK high
40
SHDN = GND, VIN= 5.5V
µV RMS
1.6
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
2.25
1.85
-1.5
-2.5
µA
V
nA
µs
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LR1125
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CMOS IC
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
SYMBOL
POK Output Low Voltage
Operating Voltage Range for Valid POK
Output
VOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
5
50
mV
5.5
V
100
nA
96
%
POWER-OK
Sinking 2mA
Sinking 100µA
Output High Leakage Current
VPOK=5.5V
Threshold
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
Rising edge, referred to VOUT
Ta=-40°C~85°C(Note 2)
PARAMETER
Input Voltage
Input Under Voltage Lockout
Output Voltage Accuracy (Preset Mode)
Adjustable Output Voltage
SET Voltage Threshold (Adjustable Mode)
Maximum Output Current
Short-Circuit Current Limit
SET Dual Mode Threshold
SET Input Bias Current
Ground-Pin Current
SHUTDOWN
Shutdown Supply Current
SHDN Input Threshold
1.0
90
TSHDN
∆TSHDN
SYMBOL
VIN
VUVLO
VOUT
VOUT(ADJ)
93
170
20
TEST CONDITIONS
Rising, 40mV hysteresis
IOUT=1mA~500mA
VSET
IOUT
ILIM
IOUT=1mA~500mA
VOUT=0V
ISET
IQ
VSET=0.8V
IOUT=1mA
IOFF
VIH
VIL
SHDN=GND, VIN=5.5V
2.5V < VIN < 5.5V
2.5V < VIN < 5.5V
SHDN=GND or IN
MIN
2.25
1.85
-4
TYP
°C
°C
MAX
5.50
2.15
+4
UNIT
V
V
%
0.8
4.5
V
766
500
600
35
-100
834
2500
125
+100
400
mV
mA
mA
mV
nA
µA
5
µA
1.6
0.6
100
V
I SHDN
SHDN Input Bias Current
10
nA
POWER-OK
POK Output Low Voltage
VOL
Sinking 2mA
50
mV
Operating Voltage Range for Valid
Sinking 100µA
1.0
5.5
V
POK Output
Output High Leakage Current
VPOK=5.5V
100
nA
Threshold
Rising edge, referred to VOUT
89
97
%
Note 1. Dropout voltage is :VIN - VOUT. For 2.25V ≤ VOUT ≤ 4V, dropout voltage limits are linearly interpolated from the
values listed. For VOUT < 4V, dropout voltage limit is equal to the value for VOUT = 4V.
2. Specifications to -40°C are guaranteed by design, not production tested.
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www.unisonic.com.tw
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QW-R502-416.A
LR1125
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CMOS IC
TYPICAL APPLICATION CIRCUIT
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QW-R502-416.A
LR1125
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CMOS IC
TYPICAL CHARACTERISTICS (VOUT = 3.3V, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT =
10µF, TA = +25°C, unless otherwise noted.)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-416.A
LR1125
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CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
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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QW-R502-416.A
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