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