LTC3738 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning

The LTC®3738 is a 3-phase 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 technique effectively triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for efficiency and ease of thermal design. Light load efficiency is optimized by using a choice of output Stage Shedding or Pulse Skip mode technology.

The LTC3738 also allows users to program load slope via a resistor for AVP control. Both external and internal thermal sensing are available from the on-chip thermal detector and comparator.

A differential amplifier provides sensing of both the high and low sides of the output voltage.

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. An all- “1” VID detector turns off the regulator after a 1µs timeout.

U.S. Patent Numbers: 5481178, 5994885, 5929620, 6177787, 6144194, 6580258, 6462525, 6593724, 6674274, 6100678 pending on AVP technique

产品特点 Features

3-Phase Controller with Onboard MOSFET Drivers
Programmable Active Voltage Positioning (AVP) with True Current Sensing
Programmable External Thermal Detection or Internal Thermal Sensing
Precise Output Current Matching Optimizes Thermal Performance and Solution Size
Supports Starting into Precharged VOUTS
Differential Amplifier Accurately Senses VOUT
PWM, Pulse Skip and Stage SheddingTM Operation
Synchronizable
210kHz to 530kHz Per Phase, Fixed Frequency
Output Power Good Indicator with Adaptive Blanking
Adjustable Soft-Start Current Ramping
Short-Circuit Shutdown Timer with Defeat Option
OPTI-LOOP® Compensation Minimizes COUT
38-Lead (5mm × 7mm) QFN Package

应用

High Performance Notebook Computers
Servers, Desktop Computers and Workstations

典型应用图

参数

LTC3738 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) *
LTC3738CUHF	QFN	38	C	$5.53	$4.65
LTC3738CUHF#PBF	QFN	38	C	$5.53	$4.65
LTC3738CUHF#TR	QFN	38	C		$4.75
LTC3738CUHF#TRPBF	QFN	38	C		$4.75

LTC3738 数据手册及相关资料下载

数据手册(英文) : LTC3738 - 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning.PDF
可靠性数据 : R384 Reliability Data .PDF