LP3983 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – Micropower, Low Quiescent Current, CMOS Voltage Regulator in micro SMD Package

LP3983
For BaseBand,300mA,Ultra-LowNoise
Ultra-fast CMOS LDO Regrlator
General Description
The LP3983 is designed for portable RF and wireless
applications with demanding performance and space
requirements. The LP3983 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 LP3983 also works with
low-ESR ceramic capacitors, reducing the amount of
board space necessary for power applications, critical in
hand-held wireless devices. The LP3983 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.
Available in the 5-lead of SOT-23-6 packages.
Pin Configurations
Features
Ultra-Low-Noise for RF Application
2.5V- 6V Input Voltage Range
Low Dropout : 200mV @ 300mA
High PSSR:-70dB at 1KHz
< 0.01uA Standby Current When Shutdown
TTL-Logic-Controlled Shutdown Input
Custom Voltage Available
Ultra-Fast Response in Line/Load Transient
Quick Start-Up (Typically 50us)
Current Limiting and Thermal Shutdown Protection
Applications
PMP/PDA/MP3 players
Cellular and Mobile phone
RF Module
Sensor Module
Ordering Information
LP3983 - □
□□ □
Top View
F:PB-Free
Package Type
B6: SOT-23-6
(SOT-23-6 )
Output Voltage:
A: Adjustable
Typical Application Circuit
Vin
1
Vin
6
Vout
2.2uF
3 _{EN LP3983AB6F}
R1
180K
4
Bypass
5
SET
10nF
3.5V
100pF 2.2uF
R2
100K
Vout=1.25X(R1/R2+1)V
Marking Information
Please see website.
LP3983-datasheet Oct.-2005
1-1