UTC LR1120G-18-AF5-A-R, LR1120G-18-AL5-A-R, LR1120G-25-AF5-A-R, LR1120G-25-AL5-A-R, LR1120G-28-AF5-A-R Schematic [ru]

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 V
* 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

Lead Free Halogen Free
LR1120L-xx-AF5-x-R LR1120G-xx-AF5-x-R SOT-25 Tape Reel
LR1120L-xx-AL5-x-R LR1120G-xx-AL5-x-R SOT-353 Tape Reel

Note: xx: Output Voltage, refer to Marking Information.

OUT

Package Packing

www.unisonic.com.tw 1 of 5

Copyright © 2013 Unisonic Technologies Co., Ltd QW-R502-331.j

LR1120 Preliminary CMOS IC

 MARKING INFORMATION

PACKAGE VOLTAGE CODE MARKING

18 :1.8V
25 :2.5V

SOT-25

SOT-353

 PIN DESCRIPTION

28 :2.8V
30: 3.0V
31 :3.1V
33 :3.3V
40 :4.0V

PIN CODE
A B C D
1 1 1 2 VIN Supply voltage input.
2 2 2 1 GND Ground.

3 3 3 - EN

4 - - - SS Soft start pin.
5 4 5 3 V

- 5 4 4, 5 NC No Connection

PIN

NAME

Input logic pin, active high for enabling the chip. When this pin goes to
a logic low, the chip will be shutdown.

Regulator output voltage pin.

OUT

 BLOCK DIAGRAM

SS

Current Limit

V

REF

­POR
OTP

+

MOS Driver

DESCRIPTION

V

IN

V

OUT

EN

R

GND

UNISONIC TECHNOLOGIES CO., LTD 2 of 5

www.unisonic.com.tw QW-R502-331.j