MAX8672

更新时间： 2024-10-01 04:41:39

品牌	Logo	应用领域
美信 - MAXIM		电池
页数	文件大小	规格书
17页	258K
描述
Complete Backup Management IC for NiMH Batteries

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数据手册

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MAX8672 数据手册

19-0653; Rev 0; 11/06

Complete Backup Management

IC for NiMH Batteries

MAX8672

General Description

Features

o Charges 1- or 2-Cell NiMH Backup Batteries

o Programmable Charge Current

The MAX8672 complete power manager for backup

batteries in smart devices offers feature-programmable

battery charging and main-system backup. The device

includes a charger for 1- or 2-cell NiMH backup batter-

ies. A low-quiescent current synchronous-rectified

boost converter and LDO supply up to 20mA during

system backup. The BST output is internally set to regu-

late at 3.05V. The MAX8672 LDO is powered from the

boost converter output and is adjustable from 1.5V to

3.05V.

o DC Trickle Charge Mode for Maximum Cell Life

o Deep-Recovery Charge Restores Cells < 1V

o Programmable Charge Timer

o Programmable Charge-Voltage Limit and Battery

UVLO

o Reverse Current Blocking on BATT, LDO, and

Boost—No Diodes Needed

The MAX8672 features programmable charge current,

undervoltage lockout (UVLO), and maximum cell volt-

age. Charging is controlled by both a timer and ther-

mistor monitor. Battery UVLO prevents excessive

battery discharge and keeps inactive-battery drain cur-

rent below 50nA. In addition, both LDO and boost con-

verter outputs block reverse current so that diodes are

not needed when connecting these outputs directly to

system supplies. The MAX8672 requires that a valid

system supply be present before system backup oper-

ation can occur.

o No Battery Drain When Off (< 50nA)

o Thermistor Sensing Disables Standard Charge

o Battery Restart Charge Threshold Prevents

Overcharge

Ordering Information

PART

PIN-PACKAGE

PKG CODE

MAX8672ETD+T

14 TDFN-14 (3mm x 3mm)

T14334+2

The MAX8672 operates in the -40°C to +85°C extended

operating temperature range.

+Denotes lead-free package.

The MAX8672 is available in a 14-pin, 3mm x 3mm TDFN

package and is rated for -40°C to +85°C operation.

Typical Operating Circuit

Applications

PDA, Palmtop, and Wireless Handhelds

THRM

Smart Cell Phones

MAX8672

2.7V TO 5.5V INPUT

Pin Configuration

CHGV

TOP VIEW

CHGI

TRKI

14 13 12 11 10

FBL

LDO

BST

BATT

BACKUP BATTERY

CONNECTION

MAX8672

1.75V

3.05V

GND

TDFN

(3mm x 3mm)

________________________________________________________________ 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...17

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与MAX8672相关器件

型号	品牌	获取价格	描述	数据表
MAX8672ETD+	MAXIM	获取价格	暂无描述
MAX8672ETD+T	MAXIM	获取价格	Complete Backup Management IC for NiMH Batteries
MAX8677A	MAXIM	获取价格	1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector
MAX8677A	ADI	获取价格	1.5A、USB/AC适配器双输入充电器与智能电源选择器
MAX8677AETG+	MAXIM	获取价格	1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector
MAX8677AETG+T	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, BICMOS, 4 X 4 MM, 0.80 MM HEIGHT, LEA
MAX8677C	MAXIM	获取价格	1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector
MAX8677C	ADI	获取价格	1.5A、USB/AC适配器双输入充电器与智能电池选择器
MAX8677CETG	MAXIM	获取价格	1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector
MAX8677CETG+	MAXIM	获取价格	暂无描述

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