描述 Description

The FAN5355 device is a high-frequency, ultra-fast transient response, synchronous step-down DC-DC converter optimized for low-power applications using small, low-cost inductors and capacitors. The FAN5355 supports up to 800mA or 1A(1) load current.

特性 Features

■ 91 Efficiency at 3MHz

■ 800mA or 1A Output Current(1)

■ 2.7V to 5.5V Input Voltage Range

■ 6 or 7-bit VOUT Programmable from 0.75 to 1.975V

■ 3MHz Fixed-Frequency Operation

■ Excellent Load and Line Transient Response

■ Small Size, 1μH Inductor Solution

■ ±2 PWM DC Voltage Accuracy

■ 35ns Minimum On-Time

■ High-Efficiency, Low-Ripple, Light-Load PFM

■ Smooth Transition between PWM and PFM

■ 37μA Operating PFM Quiescent Current

■ Software Selectable 25kHz Minimum PFM Frequency Prevents Audible Noise in PFM Mode

■ I2C?-Compatible Interface up to 3.4Mbps

■ Pin-Selectable or I2C? Programmable Output Voltage

■ On-the-Fly External Clock Synchronization

■ 10-lead MLP (3 x 3mm) or 12-bump CSP Packages

Applications

■ SmartReflex?-Compliant Power Supply

■ Split Supply DSPs and μP Solutions OMAP?, XSCALE?

■ Cell Phones, Smart Phones, PDAs, Digital Cameras, and Portable Media Players

■ Micro DC-DC Converter Modules

■ Handset Graphic Processors (NVIDIA?, ATI)