器件名称: AME5172AEEV330Z
功能描述: 0.85V Single Cell Boost DC-DC Converter
文件大小: 108.05KB 共12页
简 介:AME, Inc.
AME5172
n General Description
The AME5172 is a high-efficiency, current mode, synchronous PWM Boost DC-DC Converter with fixed 3.3V output voltage for system applications powered by single or double cell NiMH or Alkaline battery pack. Built-in 0.35 NMOS switch and 0.45 PMOS synchronous rectification significantly improves efficiency and reduces external components count. High switching frequency (at 1.2MHz) allows easy filtering and faster loop performance. AME5172 uses SOT-25 package that gives a small size solution.
0.85V Single Cell Boost DC-DC Converter
n Typical Application
L1 4.7H VIN CIN 4.7F 1 5
VOUT 3.3V up to 200mA COUT 4.7F
IN
SW
AME5172 OUT OFF ON 3 EN GND 4 2
n Features
l PWM Control with 1.2MHz Fixed Frequency l Up to 92% Efficiency l 0.85V Low Start-up Input Voltage l Internal Synchronous Rectifier l Fixed 3.3V Output Voltage Options l 0.8A, 0.35 Power MOSFET l 1A Shutdown Current l True Shutdown l SOT-25 Package l All AME's Lead Free Products Meet RoHS Standards
n Applications
l Hand-held Devices l Digital Cameras l Portable Applications l MP3 Players l LCD Bias Power l Wireless Handsets
Rev. A.02
1
AME, Inc.
AME5172
n Function Block Diagram
0.85V Single Cell Boost DC-DC Converter
IN
EN
SW
Enable Bandgap
Start-UP OSC
VOUT Good 2.3V OUT
Erroramp
Σ
OSC Ramp
PWM COMP
PWM Control
SYNC Driver
Current Limit COMP Current sense
GND
2
Rev. A.02
AME, Inc.
AME5172
n Pin Configuration
SOT-25 Top View
5 4
0.85V Single Cell Boost DC-DC……
