LP3989-01

Aug.-2014

www.lowpowersemi.com

Page 1 of 8

Preliminary Datasheet

LP3989

600mA,Ultra-low noise, Small Package,

Ultra-Fast CMOS LDO Regulator

General Description

The LP3989 is designed for portable RF and wireless

applications with demanding performance and space

requirements. The LP3989 performance is optimized

for battery-powered systems to deliver ultra low noise

and low quiescent current. Regulator ground current

increases only slightly in dropout, further prolonging

the battery life. The LP3989 also works with low-ESR

ceramic capacitors, reducing the amount of board

space necessary for power applications, critical in

hand-held wireless devices. The LP3989 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 feedback accuracy,

current limiting protection, and high ripple rejection

ratio. It is available in the 5-lead of SOT23-5

packages.

Order Information

LP3989 □ □ □ □ □

F: Pb-Free

Package Type

B5: SOT23-5

Output Type

12: 1.2V

18: 1.8V

25: 2.5V

33: 3.3V

Features



Ultra-Low-Noise for RF Application



2.2V- 6V Input Voltage Range



Low Dropout : 280mV @ 400mA



600mA Output Current, 750mA Peak Current



High PSRR: -68dB at 1KHz



< 0.01uA Standby Current When Shutdown



Available in SOT23-5 and SOT223 Package



Ultra-Fast Response in Line/Load transient



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

LP3989AB5F

SOT23-5

3K/REEL

GND

2

EN

1

VIN

4

OUT

3

ADJ

5

LP3989AB5F

Chip Enable

2.2uF

Vin

2.2uF

R1

R2

Vout

22pF