DC-DC

PT1202

时间: 2008-01-08 14:29:32 来源: 华润矽威作者: tomic; 浏览量:

GENERAL DESCRIPTION

The PT1202 is a high efficiency monolithic current mode synchronous buck regulator with a constant operation frequency. A main switch and a synchronous switch are integrated in PT1202, the device has high efficiency and no external Schottky diode needed. Supply current is 300uA during operation and drops to ≤1μA in shutdown. The 2.5V to 5.5V input voltage range makes the PT1202 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic skip cycle operation mode at light loads provides very low output ripple for noise sensitive applications. Internal 1.5MHz switching frequency allowing the use of small surface mount inductors and capacitors. Ultra low output voltages are easily available with the 0.6V feedback reference voltage. The PT1202 is offered in a low profile SOT package and is available in an adjustable version and fixed output voltages versions from 0.6v to 1.8v.

FEATURES

High Efficiency: Up to 96%

Low Quiescent Current: 300μA

600mA Output Current

2.5V to 5.5V Input Voltage Range

1.5MHz Constant Frequency Operation

Internal integrated main switch and rectifier, no Schottky Diode Required

Low Dropout Operation: 100% Duty Cycle

0.6V Reference Allows Low Output Voltages

Shutdown Mode Draws≤1μA Supply Current

Current Mode Operation for Excellent Line and Load Transient Response

Over-temperature Protected