UCC39421N

多模高频PWM控制器 Multimode High Frequency PWM Controller

description

The UCC39421 family of synchronous PWM controllers is optimized to operate from dual alkaline/NiCd cells or a single Lithium-Ion Li-Ion cell, and convert to adjustable output voltages from 2.5 V to 8 V. For applications where the input voltage does not exceed the output, a standard boost configuration is used.

Operation Down to an Input Voltage of 1.8 V

High Efficiency Boost, SEPIC or Flyback Buck-Boost Topologies

Drives External FETs for High-Current Applications

Up to 2-MHz Oscillator

Synchronizable Fixed Frequency Operation

High-Efficiency Low-Power Mode

High-Efficiency at Very Low-Power with Programmable Variable Frequency Mode

Pulse-by-Pulse Current Limit

5-µA Supply Current in Shutdown

150-µA Supply Current in Sleep Mode

Selectable NMOS or PMOS Rectification

Built-In Power-On ResetUCC39422 Only

Built-In Low-Voltage DetectUCC39422 Only

 simplified schematic block diagram and application circuit