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MAX8845Y

28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output

Maxim Integrated 

19-4340; Rev 1; 9/09

EVAALVUAAILTAIOBNLEKIT

28V Linear Li+ Battery Chargers with Battery

Detection and Overvoltage Protected Output

General Description

The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W are

intelligent, stand-alone constant-current, constant-volt-

age (CCCV), thermally regulated linear chargers

designed for charging a single-cell lithium-ion (Li+) bat-

tery. The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W

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 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/MAX8845X/MAX8845W

achieve high flexibility by providing adjustable fast-

charge currents (SETI) and an adjustable top-off cur-

rent threshold (MIN) through external resistors. The

MAX8845Z/MAX8845Y/MAX8845X/MAX8845W feature

a booting assistant circuit that distinguishes input

sources and battery connection and provides an

enable signal (ABO—MAX8845Z and ABO—

MAX8845Y/MAX8845X/MAX8845W) for system booting.

The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W also

integrate an overvoltage-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/MAX8845X/MAX8845W

accept an input supply range from 4.25V (4.4V for

MAX8845W only) to 28V, but disable charging if the

supply voltage exceeds +7.5V (+8.0V for MAX8845X

only) to protect against unqualified or faulty AC

adapters. The ICs operate over the extended tempera-

ture range (-40°C to +85°C) and are available in a com-

pact 12-pin, thermally enhanced thin QFN, 3mm x 3mm

package (0.8mm max height).

Applications

Cellular and Cordless Phones

Smart Phones and PDAs

Digital Still Cameras

MP3 Players

USB Appliances

Charging Cradles and Docks

Bluetooth® Equipment

Features

o CCCV, Thermally Regulated Linear 1-Cell Li+

Battery Charger

o No External MOSFET, Reverse Blocking Diode, or

Current-Sense Resistor

o Programmable Fast-Charge Currents (1ARMS max)

o Programmable Top-Off Current Threshold (MIN)

o Input Overvoltage Protected 4.7V Output

(MAX8845Z/MAX8845Y/MAX8845W) or 4.85V

(MAX8845X) (SAFEOUT)

o Proprietary Die Temperature Regulation Control

(+115°C)

o 4.25V (4.4V for MAX8845W only) to 28V Input

Voltage Range with Input Overvoltage Protection

Above +7.5V (+8.0V for MAX8845X only)

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

o Input Power-Source Detection Output (POK),

Charge Status Output (CHG), Charge-Enable Input

(EN)

o Output for Autobooting (ABO—MAX8845Z,

ABO—MAX8845Y/MAX8845X/MAX8845W)

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

0.8mm Height (max)

Ordering Information

PART

PIN-PACKAGE

TOP

MARK

ABO

ACTIVE

STATE

MAX8845ZETC+

MAX8845YETC+

MAX8845XETC+

MAX8845WETC+

12 Thin QFN-EP*

12 Thin QFN-EP*

12 Thin QFN-EP*

12 Thin QFN-EP*

ABL

ABM

ABQ

ABR

Active high

Active low

Active low

Active low

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.

Bluetooth is a registered trademark of Bluetooth SIG.

________________________________________________________________ Maxim Integrated Products 1

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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