LP3983S-06

May.-2017

www.lowpowersemi.com

Page 1 of 8

Preliminary Datasheet

LP3983S

300mA,Ultra-low noise, Small Package

Ultra-Fast CMOS LDO Regulator

General Description

The LP3983S is designed for portable RF and wireless

applications with demanding performance and space

requirements. The LP3983S performance is optimized

for battery-powered systems to deliver ultra low noise

and low quiescent current. A noise bypass pin is

available for further reduction of output noise.

Regulator ground current increases only slightly in

dropout, further prolonging the battery life. The

LP3983S also works with low-ESR ceramic capacitors,

reducing the amount of board space necessary for

power applications, critical in hand-held wireless

devices. The LP3983S consumes less than 0.01µA in

shutdown mode and has fast turn-on time less than

50µs. The other features include ultra low dropout

voltage, high output accuracy, current limiting

protection, and high ripple rejection ratio. It is available

in SOT23-5 packages.

Order Information

LP3983S □ □ □ □

F: Pb-Free

Package Type

B5: SOT23-5

Output Type

A：Adjustable

Features



Ultra-Low-Noise for RF Application



2V- 6V Input Voltage Range



Low Dropout : 210mV @ 300mA



300mA Output Current, 550mA Peak Current



High PSRR: -70dB at 217Hz



< 0.1uA Standby Current When Shutdown



Available in SOT23-5 Package



Current Limiting and Thermal Shutdown

Protection

Applications



Portable Media Players/MP3 players



Cellular and Smart mobile phone



LCD



DSC Sensor



Wireless Card

Typical Application Circuit

Marking Information

Device

Marking

Package

Shipping

LP3983S

LPS

1FYWX

SOT23-5

3K/REEL

Marking indication:

Y:Production year W:Production week X:Production batch

GND

2

EN

3

VIN

1

OUT

5

ADJ

4

LP3983SAB5F

Chip Enable

2.2uF

Vin

2.2uF

R1

R2

Vout

22pF