Preliminary Datasheet LP3220S
LP3220S–00 Ver. 1.0 Datasheet Feb.-2009 www.lowpowersemi.com Page 1 of 10
1.5MHZ,1000mA,High Efficiency Synchronous
PSM/PWM Step-Down DC/DC Convert with Soft-start
General Description
The LP3220S is a constant frequency, current mode,
PWM step-down converter. The device integrates a
main switch and a synchronous rectifier for high
efficiency. The 2.1V to 6.5V input voltage range makes
the LP3220S is ideally suited for portable electronic
devices that are powered from 1-cell Li-ion battery or
from other power sources within the range such as
cellular phones, PDAs and handy-terminals. Internal
synchronous rectifier with low RDS(ON) dramatically
reduces conduction loss at PWM mode. The internal
synchronous switch increases efficiency while
eliminate the need for an external Schottky diode.The
switching ripple is easily smoothed-out by small
package filtering elements due to a fixed operation
frequency of 1.5MHz. This along with small SOT-23-5
package provide small PCB area application. Other
features include soft start, lower internal reference
voltage with 2% accuracy, over temperature protection,
and over current protection。
Ordering Information
LP3220S - □ □ □ □ □
F: Pb-Free
Package Type
B5: SOT23-5
J5: TSOT23-5
Output Voltage Type
A: Adjustable type
18: 1.8V
Features
◆ High Efficiency: 96%
◆ 1.5MHz Fixed-Frequency PWM Operation
◆ Adjustable Output From 0.6V to VIN
◆ 1000mA Output Current, 1.2A Peak Current
◆ No Schottky Diode Required
◆ 100% Duty Cycle Low Dropout Operation
◆ Available in SOT23-5/TSOT23-5 Package
◆ Short Circuit and Thermal Protection
◆ Over Voltage Protection
◆ Low than 1µA Shutdown Current
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA
DSC
Wireless Card
Pin Configurations
Marking Information
Please see website.