LP3205F Datasheet, PDF (1/10 Pages) Lowpower Semiconductor inc – 1.5MHz Fixed-Frequency PWM Operation

Preliminary Datasheet LP3205F
1.5MHZ,800mA,High Efficiency Synchronous
PSM/PWM Step-Down DC/DC Convert
General Description
The LP3205F is a constant frequency, current mode,
PWM step-down converter. The device integrates a
main switch and a synchronous rectifier for high
efficiency. The 2.5V to .5V input voltage range makes
the LP3205F 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 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
LP3205F - □ □ □ □ □
Features
◆ High Efficiency: 93% 　
◆ 1.5MHz Fixed-Frequency PWM Operation
◆ Adjustable Output From 0.6V to VIN 　
◆ 1.2V, 1.5V, 1.8V, 2.5V, 3.0Vand 3.3V Fixed
◆ 800mA Output Current, 1.5A Peak Current
◆ No Schottky Diode Required
◆ 95% Duty Cycle Low Dropout Operation
◆ Available in SOT23-5/TSOT23-5 Package 　
◆ Short Circuit and Thermal Protection 　
◆ Low than 1µA Shutdown Current
Applications
Portable Media Players
Cellular and Smart mobile phone
PDA
DSC
Wireless Card
Pin Configurations
F: Pb-Free
Package Type
B5: SOT23-5
J5: TSOT23-5
Output Voltage Type
A: Adjustable type
12: 1.2V
15: 1.5V
18: 1.8V
25: 2.5V
33: 3.3V
Marking Information
Please see website.
LP3205F –00 Version. 1.0 Datasheet Feb.-2009
www.lowpowersemi.com
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