LTC3732 3-Phase, 5-Bit VID, 600kHz, Synchronous Buck Switching Regulator Controller

The LTC®3732 is a PolyPhase® synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 3-phase controller drives its output stages with 120° phase separation at frequencies of up to 600kHz per phase to minimize the RMS current losses in both the input and output filter capacitors. The 3- phase technique effectively triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for high efficiency and ease of thermal design. Light load efficiency is optimized by using a choice of output Stage Shedding or Burst Mode technology.

A differential amplifier provides true remote sensing of both the high and low side of the output voltage at load points.

Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. A foldback current circuit also provides protection for the external MOSFETs under short-circuit or overload conditions.

LTC and LT are registered trademarks of linear Technology Corporation. Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of linear Technology Corporation. Stage Shedding is a trademark of linear Technology Corporation

产品特点 Features

3-Phase Controller with Onboard MOSFET Drivers
±5% Output Current Matching Optimizes Thermal Performance and Size of Inductors and MOSFETs
4.5V </= VCC </= 7V; 4.5V </= VIN </= 32V
Differential Amplifier Accurately Senses VOUT
Reduced Input and Output Capacitance
Reduced Power Supply Induced Noise
VID DAC Programmable from 1.1V to 1.85V (VRM9.0/9.1)
±10% Power Good Output Indicator
250kHz to 600kHz Per Phase, PLL, Fixed Frequency
PWM, Stage Shedding™ or Burst Mode® Operation
OPTI-LOOP® Compensation Minimizes COUT
Adjustable Soft-Start Current Ramping
Short-Circuit Shutdown Timer with Defeat Option
Overvoltage Soft Latch
Small 36-Lead Narrow (0.209 inch) SSOP Package
QFN 5mm x 7mm 38-Lead Package

应用

Desktop Computers
High Performance Notebook Computers
High Output Current DC/DC Power Supplies

典型应用图

参数

LTC3732 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) *
LTC3732CG	SSOP	36	C	$5.18	$4.35
LTC3732CG#PBF	SSOP	36	C	$5.18	$4.35
LTC3732CG#TR	SSOP	36	C		$4.45
LTC3732CG#TRPBF	SSOP	36	C		$4.45
LTC3732CUHF	QFN	38	C	$5.18	$4.35
LTC3732CUHF#PBF	QFN	38	C	$5.18	$4.35
LTC3732CUHF#TR	QFN	38	C		$4.45
LTC3732CUHF#TRPBF	QFN	38	C		$4.45

LTC3732 数据手册及相关资料下载

数据手册(英文) : LTC3732 - 3-Phase, 5-Bit VID, 600kHz, Synchronous Buck Switching Regulator Controller.PDF
可靠性数据 : R384 Reliability Data .PDF