MAX8845Z

更新时间： 2024-11-09 11:14:31

品牌	Logo	应用领域
美信 - MAXIM		电池
页数	文件大小	规格书
18页	272K
描述
28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output

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MAX8845Z 数据手册

19-4405; Rev 0; 3/09

28V Linear Li+ Battery Chargers with Battery

Detection and Overvoltage Protected Output

Z/MAX845Y

General Description

Features

The MAX8845Z/MAX8845Y are intelligent, stand-alone

constant-current, constant-voltage (CCCV), thermally

regulated linear chargers designed for charging a sin-

gle-cell lithium-ion (Li+) battery. The MAX8845Z/

MAX8845Y integrate a current-sense circuit, MOSFET

pass element, thermal-regulation circuitry, and elimi-

nates the external reverse-blocking Schottky diode to

create the simplest and smallest charging solutions for

handheld equipment.

♦ CCCV, Thermally Regulated Linear 1-Cell Li+

Battery Charger

♦ No External MOSFET, Reverse Blocking Diode, or

Current-Sense Resistor

♦ Programmable Fast-Charge Currents (1A

max)

RMS

♦ Programmable Top-Off Current Threshold (MIN)

♦ Input Overvoltage Protected 4.7V Output

The ICs control the charging sequence from the pre-

qualification state through constant current fast-charge,

top-off charge, and full-charge indication. Proprietary

thermal-regulation circuitry limits the die temperature

during fast-charging or when the ICs are exposed to

high ambient temperatures, allowing maximum charg-

ing current without damaging the ICs.

(SAFEOUT)

♦ Proprietary Die Temperature Regulation Control

(+115°C)

♦ 4.25V to 28V Input Voltage Range with Input

Overvoltage Protection Above +7.5V

♦ Low-Dropout Voltage (300mV at 500mA)

The MAX8845Z/MAX8845Y achieve high flexibility

by providing adjustable fast-charge currents

(SETI) and an adjustable top-off current threshold

(MIN) through external resistors. The MAX8845Z/

MAX8845Y feature a booting assistant circuit that dis-

tinguishes input sources and battery connection and

provides an enable signal (ABO—MAX8845Z and

ABO—MAX8845Y) for system booting.

♦ Input Power-Source Detection Output (POK),

Charge Status Output (CHG), Charge-Enable Input

(EN)

♦ Output for Autobooting (ABO—MAX8845Z,

ABO—MAX8845Y)

♦ Tiny, 3mm x 3mm 12-Pin Thin QFN Package,

The MAX8845Z/MAX8845Y also integrate an overvolt-

age-protected output (SAFEOUT) for low voltage-rated

USB or charger inputs in system, and a battery-pack

detection circuit (DETBAT) that disables the charger

when the battery pack is absent. Other features include

an active-low control input (EN), an active-low input

power source detection output (POK), and a fully

charged top-off threshold detection output (CHG).

0.8mm Height (max)

Ordering Information

ABO

TOP

MARK

PART

PIN-PACKAGE

ACTIVE

STATE

The MAX8845Z/MAX8845Y accept an input supply

range from 4.25V to 28V, but disables charging if the

supply voltage exceeds +7.5V to protect against

unqualified or faulty AC adapters. The IC’s operate over

the extended temperature range (-40°C to +85°C) and

are available in a compact 12-pin, thermally enhanced

thin QFN, 3mm x 3mm package (0.8mm max height).

MAX8845ZETC+ 12 Thin QFN-EP*

MAX8845YETC+ 12 Thin QFN-EP*

ABL

Active high

Active low

ABM

Note: All devices are specified over the -40°C to +85°C oper-

ating temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Applications

Cellular and Cordless Phones

Smart Phones and PDAs

Digital Still Cameras

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

MP3 Players

USB Appliances

Charging Cradles and Docks

Bluetooth^®Equipment

Bluetooth is a registered trademark of Bluetooth SIG.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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与MAX8845Z相关器件

型号	品牌	获取价格	描述	数据表
MAX8845ZETC+	MAXIM	获取价格	28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output
MAX8845ZETC+T	MAXIM	获取价格	暂无描述
MAX8845ZEVKIT	MAXIM	获取价格	Programmable Top-Off Current Threshold
MAX8845ZEVKIT+	MAXIM	获取价格	Programmable Top-Off Current Threshold
MAX8847Y	MAXIM	获取价格	High-Performance Negative Charge Pump for 6 White LEDs in 3mm x 3mm Thin QFN
MAX8847YETE+T	MAXIM	获取价格	High-Performance Negative Charge Pump for 6 White LEDs in 3mm x 3mm Thin QFN
MAX8847Z	MAXIM	获取价格	High-Performance Negative Charge Pump for 6 White LEDs in 3mm x 3mm Thin QFN
MAX8847ZETE+T	MAXIM	获取价格	High-Performance Negative Charge Pump for 6 White LEDs in 3mm x 3mm Thin QFN
MAX8848Y	MAXIM	获取价格	High-Performance Negative Charge Pump for 7 White LEDs in 3mm x 3mm Thin QFN
MAX8848YETE+T	MAXIM	获取价格	High-Performance Negative Charge Pump for 7 White LEDs in 3mm x 3mm Thin QFN

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