MAX8844ZEVKIT+ Maxim Integrated Products, MAX8844ZEVKIT+ Datasheet

MAX8844ZEVKIT+

Manufacturer Part Number

MAX8844ZEVKIT+

Description

Evaluation Kit for the MAX8844Z

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8844ZEVKIT.pdf (17 pages)

Specifications of MAX8844ZEVKIT+

Pack_quantity

Comm_code

85437090

Lead_time

175

Current page: 1 of 17
Download datasheet (229Kb)

The MAX8844Z/MAX8844Y intelligent, stand-alone con-

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

lated dual input linear chargers are designed for

charging a single-cell lithium-ion (Li+) battery. The

MAX8844Z/MAX8844Y integrate a current-sense circuit,

MOSFET pass element, thermal-regulation circuitry,

and eliminate the external reverse-blocking Schottky

diode to create the simplest and smallest charging

solutions for handheld equipment.

The IC controls 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 IC is exposed to high

ambient temperatures, allowing maximum charging

current without damaging the IC.

The MAX8844Z/MAX8844Y achieve high flexibility by pro-

viding adjustable fast-charge currents (SETI) and an

adjustable top-off current threshold (MIN) through external

resistors. The IC features a booting assistant circuit that

distinguishes input sources and battery connection and

provides an enable signal (ABO, ABO) for system booting.

The ICs also integrate two input overvoltage-protected

LDO outputs (SAFEOUT, SAFEUSB) for low-voltage-

rated USB or charger inputs in system, and a battery

pack detection circuit (DETBAT) that disables the charg-

er 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 MAX8844Z/MAX8844Y automatically select between

either the USB or IN source. If both sources are present

at the same time, highest priority is given to the IN source.

The IN source is selected to ensure the shortest charging

time for the system since it is able to deliver the highest

current.

The MAX8844Z/MAX8844Y accept an input supply range

from 4.25V to 28V (IN and USB), but disable charging if

the input voltage exceeds +7.5V to protect against

unqualified or faulty AC adapters. The ICs operate over

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

available in a compact 14-pin, thermally enhanced, lead-

free TDFN 3mm x 3mm package (0.8mm max height).

19-4279; 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.

Battery Detection and Overvoltage-Protected Output

Cellular and Cordless

Phones

Smart Phones and PDAs

Digital Still Cameras

MP3 Players

28V Dual Input Linear Li+ Battery Chargers with

________________________________________________________________ Maxim Integrated Products

General Description

EVALUATION KIT

AVAILABLE

USB Appliances

Charging Cradles and

Docks

Bluetooth® Equipment

Applications

♦ CCCV, Thermally Regulated Linear One-Cell Li+

♦ No External MOSFET, Reverse Blocking Diode, or

♦ Programmable Fast-Charge Currents (1A

♦ Programmable Top-Off Current Threshold

♦ 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, MAX8844Z)

♦ Output for Autobooting (ABO, MAX8844Y)

♦ Tiny 3mm x 3mm, 14-Pin TDFN Package, 0.8mm

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

* EP = Exposed pad.

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

ating temperature range.

Typical Operating Circuit and Pin Configuration appear at

end of data sheet.

MAX8844ZETD+

MAX8844YETD+

Battery Charger

Current-Sense Resistor

(SAFEOUT) from IN

(SAFEUSB) from USB

(+115°C)

Overvoltage Protection Above +7.5V

Charge Status Output (CHG), Charge-Enable Input

(EN)

Height (max)

PART

14 TDFN-EP*

PACKAGE

PIN-

Ordering Information

TOP MARK

AEK

AEN

Features

Active high

RMS

Active low

ACTIVE

STATE

ABO

max)

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