MAX8845Z Maxim Integrated Products, MAX8845Z Datasheet

MAX8845Z

Manufacturer Part Number

MAX8845Z

Description

28V Linear Li+ Battery Chargers

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8845Z.pdf (18 pages)

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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.

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.

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.

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).

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).

19-4405; Rev 0; 3/09

Bluetooth is a registered trademark of Bluetooth SIG.

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.

28V Linear Li+ Battery Chargers with Battery

Cellular and Cordless Phones

Smart Phones and PDAs

Digital Still Cameras

MP3 Players

USB Appliances

Charging Cradles and Docks

Bluetooth

Detection and Overvoltage Protected Output

________________________________________________________________ Maxim Integrated Products

Equipment

General Description

Applications

♦ CCCV, Thermally Regulated Linear 1-Cell Li+

♦ No External MOSFET, Reverse Blocking Diode, or

♦ Programmable Fast-Charge Currents (1A

♦ Programmable Top-Off Current Threshold (MIN)

♦ Input Overvoltage Protected 4.7V Output

♦ Proprietary Die Temperature Regulation Control

♦ 4.25V to 28V Input Voltage Range with Input

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

♦ Input Power-Source Detection Output (POK),

♦ Output for Autobooting (ABO—MAX8845Z,

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

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.

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

MAX8845ZETC+

MAX8845YETC+

Battery Charger

Current-Sense Resistor

(SAFEOUT)

(+115°C)

Overvoltage Protection Above +7.5V

Charge Status Output (CHG), Charge-Enable Input

(EN)

ABO—MAX8845Y)

0.8mm Height (max)

PART

PIN-PACKAGE

12 Thin QFN-EP*

Ordering Information

MARK

ABM

TOP

ABL

Features

RMS

Active high

Active low

ACTIVE

STATE

ABO

max)

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