LTC3456 2-Cell, Multi-Output DC/DC Converter with USB Power Manager

The LTC®3456 is a complete power management system IC optimized for a variety of portable applications. The device generates two separate power rails: a 3.3V (fixed) Main supply and a 1.8V (adjustable) Core supply. In addition, the LTC3456 contains a USB power manager, a Hot Swap output, a low-battery indicator and an alwaysalive VMAX output. The LTC3456 takes power from one of three sources: a Wall adapter, a USB port or a 2-cell Alkaline/NiCd/NiMH battery, in that order of priority. Current drawn from the USB port is accurately limited to 100mA or 500mA based on the state of the USBHP pin.

The Main and Core switchers are all high efficiency, 1MHz fixed frequency PWM converters. Availability in a small (4mm × 4mm × 0.75mm) 24-pin QFN package makes the LTC3456 ideal for space-sensitive portable devices

产品特点 Features

Seamless Transition Between 2-Cell Battery, USB and AC Wall Adapter Input Power Sources
Main Output: Fixed 3.3V Output
Core Output: Adjustable from 0.8V to VBATT(MIN)
Hot SwapTM Output for Memory Cards
All Outputs Discharged to Ground During Shutdown
Power Supply Sequencing: Main and Hot Swap Outputs Come Up After Core Output
Accurate USB Current Limiting
High Frequency Operation: 1MHz
High Efficiency: Up to 92%
Small (4mm × 4mm × 0.75mm) 24-Pin QFN Package

应用

GPS Portable Navigators
MP3 Players
Digital Cameras
Handheld Computers

典型应用图

参数

LTC3456 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC3456EUF	QFN	24	E	$4.70	$3.95
LTC3456EUF#PBF	QFN	24	E	$4.70	$3.95
LTC3456EUF#TR	QFN	24	E		$4.05
LTC3456EUF#TRPBF	QFN	24	E		$4.05

LTC3456 数据手册及相关资料下载

数据手册(英文) : LTC3456 - 2-Cell, Multi-Output DC/DC Converter with USB Power Manager.PDF
设计要点 (英文) : DN1006 - Multiple Output DC/DC Converter Runs Off 2-Cell AA Batteries, USB or AC Wall Adapter.PDF
可靠性数据 : R415 Reliability Data .PDF