Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR1120
Preliminary
CMOS IC
500mA, LOW DROPOUT, LOW
NOISE ULTRA-FAST WITH
SOFT START CMOS LDO
REGULATOR

DESCRIPTION
UTC LR1120, a 500mA LDO regulator, has very high PSRR and
super low dropout voltage especially suitable for wireless and
portable applications.
In the field of hand-held wireless devices, board space and
battery life are the main concerns of designers and end-users.
Because of the low quiescent current and low ESR ceramic
capacitors, UTC LR1120 can satisfy those concerns.
Furthermore, low current consumption in shutdown mode
(0.7μA), fast turn-on time (<70μs), high output accuracy, current
limiting protection, and high ripple rejection ratio are advantages of
UTC LR1120.

FEATURES
* Operating Voltage Ranges : 2.2V to 5.5V
* Dropout : 250mV at 500mA
* When IC Shutdown: 5mA Discharge Current of VOUT
* Extreme Low Noise for DSC Application
* Extreme Fast Response in Line/Load Transient
* Internal Current Limiting Protection
* Internal Thermal Shutdown Protection
* High PSRR
* Recommended 1μF Output Capacitor only for Stability
* With TTL Logic Controlled Shutdown Input

ORDERING INFORMATION
Ordering Number
LR1120G-xx-AF5-x-R
LR1120G-xx-AL5-x-R
Note: xx: Output Voltage, refer to Marking Information.
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOT-25
SOT-353
Packing
Tape Reel
Tape Reel
1 of 4
QW-R502-331.l
LR1120
Preliminary
MARKING INFORMATION

PACKAGE
VOLTAGE CODE
18 :1.8V
25 :2.5V
28 :2.8V
30: 3.0V
31 :3.1V
33 :3.3V
40 :4.0V
SOT-25
SOT-353
MARKING
PIN DESCRIPTION


CMOS IC
A
1
2
PIN CODE
B
C
1
1
2
2
D
2
1
PIN
NAME
VIN
GND
3
3
3
-
EN
4
5
-
4
5
5
4
3
4, 5
SS
VOUT
NC
DESCRIPTION
Supply voltage input.
Ground.
Input logic pin, active high for enabling the chip. When this pin goes to
a logic low, the chip will be shutdown.
Soft start pin.
Regulator output voltage pin.
No Connection
BLOCK DIAGRAM
SS
Current Limit
VIN
VREF
POR
OTP
+
MOS Driver
VOUT
EN
R
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 4
QW-R502-331.l
LR1120

Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA= 25°C, unless otherwise specified.)
PARAMETER
Supply Input Voltage
EN Input Voltage
RATINGS
UNIT
6
V
6
V
SOT-25
0.38
W
Power Dissipation (TA = 25°C)
PD
SOT-353
0.25
W
Junction Temperature
TJ
150
°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
VEN
THERMAL DATA
PARAMETER
Junction to Ambient

SYMBOL
SOT-25
SOT-353
θJA
RATINGS
260
400
OPERATING CONDITIONS
PARAMETER
SYMBOL
RATINGS
Supply Input Voltage
VIN
2.2 ~ 5.5
Junction Temperature
TJ
-40 ~ +125
Ambient Temperature
TA
-40 ~ +85
Note: The device is not guaranteed to function outside its operating conditions.

UNIT
°C/W
°C/W
UNIT
V
°C
°C
ELECTRICAL CHARACTERISTICS
(VIN = VOUT + 0.5V, VEN = VIN, CIN = COUT = 1μF (Ceramic), TA= 25°C, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Input Voltage
VIN
2.2
5.5
V
Output Voltage Accuracy
∆VOUT
IOUT = 10mA
-2
0
+2
%
∆VOUT
Line Regulation
0.01 0.2 %/V
VIN = (VOUT+0.5V) ~ 5.5V, IOUT = 1mA
∆VIN × VOUT
∆VOUT
1mA<IOUT<400mA, 2.2V≤VIN<2.7V
0.6
%
Load Regulation (Note 1)
VOUT
1mA<IOUT<500mA, 2.7 V≤VIN≤5.5V
1
%
Quiescent Current (Note 2)
IQ
VEN = 5V, IOUT = 0mA
25
50
μA
Standby Current
ISTN-BY
VEN = 0V
0.7
1.5
μA
RLOAD = 0Ω, 2.2V≤VIN<2.7V
0.4
0.7 1.05
A
Current Limit
ILIMIT
RLOAD = 0Ω, 2.7V≤VIN≤5.5V
0.5
0.8 1.05
A
IOUT = 400mA
160 320
Dropout Voltage (Note 3)
VD
mV
IOUT = 500mA
250 400
Soft Start Time
VOUT = 2.5V, CSS = 1nF, COUT = 1μF
0.7
1
ms
Logic-Low
VIL
0
0.6
V
EN Threshold
1.6
5.5
V
Logic-High
VIH
Enable Pin Current
IEN
0.1
1
5
μA
Over Temperature Shutdown
OTS
170
°C
Over Temperature Hysteresis
OTH
30
°C
Power Supply Rejection Rate
PSRR
IOUT = 10mA, f = 10kHz
55
dB
Output Noise Voltage
eN
VOUT=1.5V,COUT=1μF,IOUT=0mA, CSS = 1nF
40
μVRMS
Notes: 1. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested
for load regulation in the load range from 1mA to 500mA.
2. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN IOUT under no load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load
current plus the ground pin current.
3. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL)×98%.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 4
QW-R502-331.l
LR1120

Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 4
QW-R502-331.l
Similar pages