MAX1894

更新时间： 2024-09-15 22:57:59

品牌	Logo	应用领域
美信 - MAXIM		电池
页数	文件大小	规格书
16页	307K
描述
Advanced Li+ Battery-Pack Protectors

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MAX1894 数据手册

19-2278; Rev 0; 4/02

Advanced Li+ Battery-Pack Protectors

General Description

Features

The MAX1894/MAX1924 are lithium-ion/lithium-polymer

(Li+) battery-pack protector ICs for 3- or 4-series Li+ bat-

tery packs. The MAX1894/MAX1924 enhance the useful

operating life of Li+ batteries by monitoring individual cell

voltages and preventing over/undervoltage conditions.

The MAX1894/MAX1924 also protect the battery pack

against charge current, discharge current, and pack-

short fault conditions.

ꢀ Protect Against Cell Overvoltage

Factory Programmable Limits from 4V to 4.4V

Accurate to ±±.ꢀ5

ꢀ Protect Against Cell Undervoltage

Factory Programmable Limits from 2V to 3.2V

Accurate to ±2.±5

ꢀ Protect Against Charge, Discharge, and Pack-

In case of a fault condition, on-board drivers control

external P-channel MOSFETs, which disconnect the cells

from the pack external terminals. The external protection

MOSFETs are connected in a common-source configura-

tion that does not require external pullup resistors. The

MAX1894/MAX1924 use only one current-sense resistor

to achieve the protection features. All protection thresh-

olds and delays do not require any external components

and are trimmed at the factory.

Short Current Faults

ꢀ Automatically Trickle Charges Deeply Discharged

Cells

ꢀ Fully Integrated MOSFET Drivers Do Not Require

Pullup Resistors

ꢀ ±.8µA (typ) Shutdown Supply Current Prevents

Deep Discharge of Cells

ꢀ 3±µA (typ) Operating Supply Current

ꢀ 28V (max) Input Voltage

If any cell voltage drops below the undervoltage thresh-

old, the MAX1894/MAX1924 disconnect the pack from

the load and power down to prevent deep discharge of

the pack. The MAX1894/MAX1924 offer a trickle-charge

feature, which provides a low-current path to safely

charge a deeply discharged pack. The MAX1894/

MAX1924 also have two logic-level inputs, which can be

used by a microcontroller to disable the protection

MOSFETs and to put the device in shutdown. The

MAX1894/MAX1924 have low quiescent current (30µA

typ) and ultra-low shutdown current (0.8µA typ) to pre-

vent deep-cell discharge.

ꢀ Available in Small 16-Pin QSOP Package

Pin Configuration

TOP VIEW

B4P

16 SRC

15 DSO

CGO

B3P

IC3

B2P

IC2

B1P

IC1

13 TKO

12 SHDN

11 CTL

10 PKN

The MAX1894X is designed for 4-series battery packs,

without hysteresis on the protection thresholds. The

MAX1924V and MAX1924X include hysteresis for the 3-

and 4-series packs, respectively.

MAX1894

MAX1924

Applications

QSOP

3- or 4-Series Li+ Battery Packs

Ordering Information

OVERVOLTAGE

THRESHOLD HYSTERESIS

PART

TEMP RANGE

PIN-PACKAGE

CELLS

OVERVOLTAGE

MAX1894XEEE

MAX1924VEEE

MAX1924XEEE

-40°C to +85°C

16 QSOP

4.25V*

4.35V*

Yes

*Contact factory for alternative threshold voltages.

Typical Applications Circuits appear at end of data sheet.

________________________________________________________________ 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...16

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与MAX1894相关器件

型号	品牌	获取价格	描述	数据表
MAX1894EVKIT	MAXIM	获取价格	Evaluation Kits for the MAX1894/MAX1924
MAX1894-MAX1924	MAXIM	获取价格	Advanced Li+ Battery-Pack Protectors
MAX1894XEEE	MAXIM	获取价格	Advanced Li+ Battery-Pack Protectors
MAX1894XEEE+	MAXIM	获取价格	暂无描述
MAX1894XEEE-T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, PDSO16, 0.150 INCH, 0.025 INCH PITCH, QSOP
MAX1895	MAXIM	获取价格	High-Efficiency, Wide Brightness Range, CCFL Backlight Controllers
MAX1895EGI	MAXIM	获取价格	High-Efficiency, Wide Brightness Range, CCFL Backlight Controllers
MAX1895EGI-T	MAXIM	获取价格	Fluorescent Light Controller, Voltage-mode, 1A, 300kHz Switching Freq-Max, PQCC28, 5 X 5 M
MAX1895ETI	MAXIM	获取价格	High-Efficiency, Wide Brightness Range, CCFL Backlight Controllers
MAX1895EVSYS	MAXIM	获取价格	Evaluation Systems for the MAX1895/MAX1995

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