LTC1704 550kHz Synchronous Switching Regulator Controller Plus linear Regulator Controller

The LTC®1704/LTC1704B include a high power synchronous switching regulator controller plus a linear regulator controller. The switching regulator controller is designed to drive a pair of N-channel MOSFETs in a voltage mode, synchronous buck configuration to provide the main supply. The constant frequency, true PWM architecture switches at 550kHz, minimizing external component size, cost and optimizing load transient performance. The LTC1704 features automatic transition to power saving Burst Mode operation at light loads. The LTC1704B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency. The linear regulator controller is designed to drive an external NPN power transistor to provide up to 2A of current to an auxiliary load.

The LTC1704/LTC1704B deliver better than ±1.5% DC accuracy at the switcher outputs and ±2% at the linear regulator outputs. High performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions. An open-drain PGOOD output indicates when both outputs are within ±10% of their regulated values

产品特点 Features

Dual Regulated Outputs: One Switching Regulator and One linear Regulator
Excellent DC Accuracy: ±1.5% for Switcher and ±2% for linear Regulator
External N-Channel MOSFET Architecture
No External Current Sense Resistor Required
Burst Mode® Operation at Light Load (LTC1704)
Continuous Switching at Light Load (LTC1704B)
linear Regulator with Programmable Current Limit
linear Regulator with Programmable Start-Up Delay
Low Shutdown Current: <150µA
High Efficiency Over Wide Load Current Range
PGOOD Flag Monitors Both Outputs
Small 16-Pin Narrow SSOP Package

应用

Multiple Logic Supply Generator
Distributed Power Applications
High Efficiency Power Conversion

典型应用图

参数

LTC1704 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) *
LTC1704BEGN	SSOP	16	E	$5.89	$4.10
LTC1704BEGN#PBF	SSOP	16	E	$5.89	$4.10
LTC1704BEGN#TR	SSOP	16	E		$4.20
LTC1704BEGN#TRPBF	SSOP	16	E		$4.20
LTC1704EGN	SSOP	20	E	$5.89	$4.10
LTC1704EGN#PBF	SSOP	20	E	$5.89	$4.10
LTC1704EGN#TR	SSOP	20	E		$4.20
LTC1704EGN#TRPBF	SSOP	20	E		$4.20

LTC1704 数据手册及相关资料下载

数据手册(英文) : LTC1704 - 550kHz Synchronous Switching Regulator Controller Plus linear Regulator Controller.PDF
设计要点 (英文) : DN311 - Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs.PDF
设计要点 (中文) : DN311 Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs.PDF
可靠性数据 : R384 Reliability Data .PDF