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MAX8606

USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN

Maxim Integrated 

19-3795; Rev 1; 12/08

EVAALVUAAILTAIOBNLEKIT

USB/AC Adapter, Li+ Linear Battery Charger

with Integrated 50mΩ Battery Switch in TDFN

General Description

The MAX8606 complete 1-cell Li+ battery charge-man-

agement IC operates from either a USB port or AC

adapter. It integrates a battery disconnect switch, cur-

rent-sense circuit, PMOS pass element, and thermal-

regulation circuitry, while eliminating the external

reverse-blocking Schottky diode, to create a simple

and small charging solution. The charging sequence

initiates from power-OK indication, through prequalifi-

cation, fast-charge, top-off charge, and finally charg-

ing-complete indication for single-cell Li+ batteries.

Charging is controlled using constant current, constant

voltage, or constant die-temperature (CCCVCTJ) regu-

lation for safe operation in handhelds.

Two logic inputs (EN1 and EN2) select suspend mode,

100mA, 500mA, or ≤1A input current limits to suit USB

requirements. Proprietary thermal-regulation circuitry

limits the die temperature to +100°C to prevent exces-

sive heat on the system PC board. Additional safety

features include an NTC thermistor input (THM) and

internal timers to protect the battery. A 3.5V to 4.2V SYS

output, in conjunction with the low-RDSON battery

switch, powers the system even when the battery is

deeply discharged or not installed. The IC also offers a

+3.3V/500µA output (VL), a charging status flag (CHG),

and an input-supply detection flag (POK). The

MAX8606 operates from a +4.25V to +5.5V supply and

includes undervoltage lockout below +3.4V and over-

voltage protection up to +14V.

Applications

Cellular Phones, Smartphones, PDAs

Digital Cameras, MP3 Players

USB Appliances, Charging Cradles and Docks

TOP VIEW

Pin Configuration

14 13 12 11 10 9 8

MAX8606

12 34 567

Features

♦ Small 3mm x 3mm Thermally Enhanced TDFN

Package (0.8mm max height)

♦ USB-Compliant Suspend Mode (20µA)

♦ Selectable 100mA, 500mA, and Up to 1A Input

Current Limits

♦ USB or AC Adapter Input

♦ +6V to +14V Input Overvoltage Protection

♦ Input UVLO Below +4V Rising (3.5V Falling)

♦ Automatic Current Sharing Between Battery

Charging and System

♦ Die Temperature Regulation (+100°C)

♦ Prequal, Fast-Charge, and Top-Off Timers

♦ Low Dropout Voltage, 250mV at 0.5A

♦ NTC Thermistor Input

♦ Charge Status and Input-Supply Detection Flags

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX8606ETD+ -40°C to +85°C 14 TDFN 3mm x

3mm (T1433-1)

+Denotes lead-free/RoHS-compliant package.

TOP

MARK

AAF

Typical Operating Circuit

USB/AC-ADAPTER

OVP UP TO 14V

INPUT

CURRENT

SELECTION

μP

STAND-ALONE

IN

GND

VL

CONTROL

STATUS

INDICATORS

CHG

POK

SYS 3.5V TO 4.2V

0.1μF

EN1

BAT

EN2

THM

TMR

Li+

SETI

MAX8606

TDFN

________________________________________________________________ Maxim Integrated Products 1

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.

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