MAX1887

更新时间： 2024-11-04 22:57:59

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
33页	1015K
描述
Quick-PWM Slave Controllers for Multiphase, Step-Down

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MAX1887 数据手册

19-2188; Rev 1; 9/02

Quick-PWM Slave Controllers for

Multiphase, Step-Down Supplies

General Description

Features

The MAX1887/MAX1897 step-down slave controllers are

intended for low-voltage, high-current, multiphase DC-to-

DC applications. The MAX1887/MAX1897 slave con-

trollers can be combined with any of Maxim’s

Quick-PWM™ step-down controllers to form a multiphase

DC-to-DC converter. Existing Quick-PWM controllers,

such as the MAX1718, function as the master controller,

providing accurate output voltage regulation, fast tran-

sient response, and fault protection features.

Synchronized to the master’s low-side gate driver, the

MAX1887/MAX1897 include the Quick-PWM constant on-

time controller, gate drivers for a synchronous rectifier,

active current balancing, and precision current-limit cir-

cuitry.

o Quick-PWM Slave Controller

o Precise, Active Current Balance (±±1.25m ꢀ

o Accurate, Adjustable Current-Li5it Threshold

o Opti5ized for Low-Output moltages (≤.mꢀ

o 4m to .8m Battery Input Range

o Fixed 300kHz (MAX±887ꢀ or Selectable

.00kHz/300kHz/220kHz (MAX±897ꢀ Switching

Frequency

o Drive Large Synchronous-Rectifier MOSFETs

o 2.2µA (typꢀ I

Supply Current

o .0µA Standby Supply Current

The MAX1887/MAX1897 provide the same high effi-

ciency, ultra-low duty factor capability, and excellent

transient response as other Quick-PWM controllers. The

MAX1887/MAX1897 differentially sense the inductor

currents of both the master and the slave across cur-

rent-sense resistors. These differential inputs and the

adjustable current-limit threshold derived from an exter-

nal reference allow the slave controller to accurately

balance the inductor currents and provide precise cur-

rent-limit protection. The MAX1887/MAX1897’s dual-

purpose current-limit input also allows the slave

controller to automatically enter a low-power standby

mode when the master controller shuts down.

o <±µA Shutdown (MAX±897ꢀ Supply Current

o S5all ±6-Pin QSOP (MAX±887ꢀ, Co5pact

.0-Pin 255 x 255 QFN (MAX±897ꢀ, or

.0-Pin 255 x 255 Thin QFN (MAX±897ꢀ

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX±887EEE -40°C to +85°C 16 QSOP

MAX±897EGP*

-40°C to +85°C 20 QFN 5mm 5mm

MAX1897ETP -40°C to +85°C 20 Thin QFN 5mm 5mm

The MAX1887 triggers on the rising edge of the mas-

ter’s low-side gate driver, which staggers the on-times

of both master and slave, providing out-of-phase oper-

ation that can reduce the input ripple current and con-

sequently the number of input capacitors. The

MAX1897 features a selectable trigger polarity, allowing

out-of-phase or simultaneous in-phase operation.

*Contact factory for availability.

Pin Configuration

TOP VIEW

19 18

17 16

Applications

CM+

CM-

TON

Notebook Computers

CPU Core Supply

Single-Stage (BATT to V

) Converters

CORE

SHDN

MAX1897

Two-Stage (5V to V

) Converters

CORE

CS-

CS+

Servers/Desktop Computers

Telecom

Typical Operating Circuit appears at end of data sheet.

THIN QFN 255 x 255

Pin Configurations continued at end of data sheet.

Quick-PWM is a registered trademark of Maxim Integrated

Products, Inc.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...33

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与MAX1887相关器件

型号	品牌	获取价格	描述	数据表
MAX1887EEE	MAXIM	获取价格	SMPS Controller
MAX1887EEE+	MAXIM	获取价格	Switching Controller, 40A, 300kHz Switching Freq-Max, BICMOS, PDSO16, QSOP-16
MAX1887EEE+T	MAXIM	获取价格	Switching Controller, 40A, 300kHz Switching Freq-Max, BICMOS, PDSO16, QSOP-16
MAX1887EEE-T	MAXIM	获取价格	Switching Controller, 40A, 300kHz Switching Freq-Max, BICMOS, PDSO16, QSOP-16
MAX1888	MAXIM	获取价格	Low-Cost Integrated Offset Logic for Notebook CPU Power Supplies
MAX1888EUA	MAXIM	获取价格	Low-Cost Integrated Offset Logic for Notebook CPU Power Supplies
MAX1888EUA+	MAXIM	获取价格	Analog Circuit, 1 Func, CMOS, PDSO8, MICRO MAX PACKAGE-8
MAX1888EUA-T	MAXIM	获取价格	Analog Circuit, 1 Func, CMOS, PDSO8, MICRO MAX PACKAGE-8
MAX1889	MAXIM	获取价格	Triple-Output TFT LCD Power Supply with Fault Protection
MAX1889EGE	MAXIM	获取价格	Triple-Output TFT LCD Power Supply with Fault Protection

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