PST731xxB
300mA Ultra Low LDR LDO
General Description
The PST731xxB family of low-dropout (LDO),
low-power linear regulators offers high power supply
rejection ratio (PSRR) while maintaining very low 35A
ground current. The family uses an advanced CMOS
process and a PMOSFET pass device to achieve fast
start-up, very low noise, excellent transient response,
and excellent PSRR performance. The PST731xxB is
stable with a 1.0F ceramic output capacitor, and uses a
precision voltage reference and feedback loop to
achieve a worst-case accuracy of 3% over all load, line,
process, and temperature variations. It is fully specified
from TJ = –40°C to +125°C and is offered in a small
TSOT23-5 package, a tiny SC70-5 package, and a
ultra-small 2mm × 2mm DFN package with a thermal
pad, which are ideal for small form factor portable
equipment such as wireless handsets and PDAs.
The PST731xxB is available in standard fixed output
voltages of 1.2V (PST73112B), 1.5V (PST73115B),
1.8V (PST73118B), 2.5V (PST73125B), 2.8V
(PST73128B), 3.0V (PST73130B), 3.3V (PST73133B),
and custom voltage options (50mV step options
between 0.8V and 5.0V are available upon request).
Features
Wide Input Voltage Range: 2.5V to 6.0V
Up to 300mA Load Current
Standard Fixed Output Voltage Options: 1.2V, 1.5V,
1.8V, 2.5V, 2.8V, 3.0V, and 3.3V
Other Output Voltage Options Available on Request
Very Low IQ: 35µA
Ultra Low Dropout: 190mV at 300mA Load
High PSRR: 65db at 100Hz
Ultra-Fast Start-Up Time: 25µs
Excellent Load/Line Transient Response
Line Regulation: 0.03% typical
Load Regulation: 0.1% typical
Stable With 1µF Output Capacitor and Full Load
Range (0 to 300mA)
Short Circuit and Overcurrent Protection
Thermal Shutdown Protection
5kV HBM ESD Protection
Typical Application Diagram
Vin
IN
Ambient Temperature Range: -40ºc To 85°C
TSOT23-5, SOT23-5,SC70-5, and DFN package
Applications
Smart Phones and Cellular Phones
PDAs
MP3/MP4 Player
Digital Still Cameras
Portable instruments
Pin Configuration
TSOT23-5
(Top View)
IN 1
5 OUT
GND 2
EN 3
4 NC
SC70-5
(Top View)
IN 1
5 OUT
GND 2
EN 3
4 NC
DFN2x2-6
(Top View)
EN 1
6 NC
GND 2
5 NC
IN 3
4 OUT
OUT
Vout
PST731xxB
Enable EN
GND
1 Rev. 1.2
