Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Li-Ion, Li-Po TDFN 8 EP (2x2) Surface-mount

General Description

The MAX8808X/MAX8808Y/MAX8808Z intelligent,

stand-alone constant-current/constant-voltage (CCCV),

thermally regulated linear chargers are designed for

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

MAX8808X/MAX8808Y/MAX8808Z integrate the cur-

rent-sense circuit, MOS pass element, and thermal-reg-

ulation circuitry, and eliminate the reverse-blocking

Schottky diode to create the simplest and smallest

charging solution for handheld equipment.

The MAX8808X functions as a stand-alone charger to

control the charging sequence from the prequalification

state through fast-charge, top-off charge, and full-

charge indication. The MAX8808Y and MAX8808Z elimi-

nate the prequalification state to allow startup into a load

without a battery. Proprietary thermal-regulation circuitry

limits the die temperature when fast-charging or while

exposed to high ambient temperatures, allowing maxi-

mum charging current without damaging the IC.

The MAX8808X/MAX8808Y/MAX8808Z achieve high

flexibility by providing an adjustable fast-charge current

with an external resistor. Other features include a bat-

tery charging-status indicator (CHG), an active-low con-

trol input (EN) for the MAX8808X and MAX8808Z

(active-high control input for the MAX8808Y), and an

active-low input power-source detection output (ACOK).

The MAX8808X/MAX8808Y/MAX8808Z accept a

+4.25V to +15V supply, but disable charging when the

input voltage exceeds +7V to protect against unquali-

fied or faulty AC adapters. The MAX8808X/MAX8808Y/

MAX8808Z operate over the extended temperature

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

8-pin thermally enhanced 2mm x 2mm TDFN package

with 0.8mm (max) height.

Applications

Cellular and Cordless Phones

Smartphones and PDAs

Digital Still Cameras and MP3 Players

USB Appliances

Charging Cradles and Docks

Bluetooth

Equipment

Features

♦ Stand-Alone Linear 1-Cell Li+ Battery Charger

♦ No External FET, Reverse Blocking Diode, or

Current-Sense Resistor Required

♦ Programmable Fast-Charge Current (1A max)

♦ Proprietary Die Temperature Regulation Control

(+115°C)

♦ +4.25V to +15V Input Voltage Range with Input

OVP Above +7V

♦ Charge-Current Monitor for Fuel Gauging

♦ Low Dropout Voltage—300mV at 500mA

♦ Input Power-Source Detection Output (ACOK) and

Charge-Enable Input (EN or EN)

♦ Soft-Start Limits Inrush Current

♦ Charge-Status Output (CHG) for LED or

Microprocessor (µP) Interface

♦ Tiny 2mm x 2mm 8-Pin TDFN Package, 0.8mm

(max) Height

MAX8808X/MAX8808Y/MAX8808Z

1A Linear Li+ Battery Chargers with Integrated Pass

FET and Thermal Regulation in 2mm x 2mm TDFN

________________________________________________________________ Maxim Integrated Products 1

PART PIN-PACKAGE

TOP

MARK

MAX8808XETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)

AAC

MAX8808YETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)

AAB

MAX8808ZETA+ 8 TDFN-EP* 2mm x 2mm (T822-1)

AAA

Ordering Information

MAX8808X

MAX8808Y

MAX8808Z

4.2V

Li+

4.25V TO 15V

*MAX8808Y USES ACTIVE-HIGH LOGIC FOR EN.

CHG

ISET VL

GND

EN*

BATT

ACOK

OFF

Typical Operating Circuit

19-3670; Rev 0; 4/05

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.

Pin Configuration appears at end of data sheet.

Bluetooth is a registered trademark of Bluetooth SIG.

All devices specified over the -40°C to +85°C operating range.

+Denotes lead-free package.

*EP = Exposed paddle.

EVALUATION KIT

AVAILABLE

Summary of content (13 pages)

PAGE 1
9-3670; Rev 0; 4/05 KIT ATION EVALU E L B AVAILA 1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN Features The MAX8808X/MAX8808Y/MAX8808Z intelligent, stand-alone constant-current/constant-voltage (CCCV), thermally regulated linear chargers are designed for charging a single-cell lithium-ion (Li+) battery.
PAGE 2
MAX8808X/MAX8808Y/MAX8808Z 1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN ABSOLUTE MAXIMUM RATINGS IN to GND ...............................................................-0.3V to +16V VL, BATT, EN, ACOK, CHG to GND.........................-0.3V to +6V VL, ISET to GND .......................................................-0.3V to +4V VL to IN................................................................-16.3V to +0.3V IN to BATT Continuous Current......
PAGE 3
1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN (VIN = 5V, VBATT = 4.0V, R ACOK = R CHG = 100kΩ to 5V, EN = unconnected (for the MAX8808X and MAX8808Z), EN = VL (for the MAX8808Y), RISET = 2.8kΩ to GND, CVL = 0.47µF, CBATT = 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Prequal Charge Current CONDITIONS Percentage of the fast-charge current, VBATT = 2.
PAGE 4
Typical Operating Characteristics (VIN = 5V, VBATT = 4.0V, ACOK = EN = unconnected, RISET = 2.8kΩ to GND, CIN = 1µF, CBATT = 1µF, CVL = 0.47µF, TA = +25°C, unless otherwise noted.) DISABLED-MODE SUPPLY CURRENT vs. INPUT VOLTAGE 700 1.4 1.2 1.0 0.8 0.6 600 500 400 300 200 0.4 900 800 700 600 MAX8808Y/ MAX8808Z 500 400 MAX8808X 300 200 0.2 100 0 0 2 4 6 8 10 12 14 16 VEN = 5V OR VEN = 0V 100 0 0 INPUT VOLTAGE (V) 2 4 6 8 10 12 14 16 CHARGE CURRENT vs.
PAGE 5
1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN PIN NAME FUNCTION 1 IN Input Supply Voltage. Bypass IN to GND with a 1µF or larger ceramic capacitor to improve line noise and input transient rejection. 2 VL Internally Generated Logic Supply for IC. Bypass VL to GND with a 0.47µF ceramic capacitor. 3 GND Ground. Connect GND and exposed pad to a large copper ground plane for maximum power dissipation.
PAGE 6
MAX8808X/MAX8808Y/MAX8808Z 1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN exceeds 2.5V, the charger soft-starts as it enters the fast-charge stage. In the MAX8808X/MAX8808Y/ MAX8808Z, the fast-charge current level is programmed through a resistor from ISET to GND. As the battery voltage approaches 4.2V, the charging current is reduced.
PAGE 7
1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN AND D N < 7V VIN VBATT A D E > L VIN ENAB IC MAX8808X VBATT < 2.5V VIN > 7V OR VBATT > VIN OR IC DISABLED VBATT < 2.4V MAX8808Y/ MAX8808Z ASYNCHRONOUS FROM ANYWHERE VIN > 7V OR VBATT > VIN OR IC DISABLED V VIN IN < > 7 IC VB V AN EN ATT D AB AN LE D D PREQUAL 10% CHARGE CURRENT CHG = LOW MAX8808X/MAX8808Y/MAX8808Z SHUTDOWN CHARGER = OFF CHG = HIGH VBATT > 2.
PAGE 8
MAX8808X/MAX8808Y/MAX8808Z 1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN VL Internal Voltage Regulator The MAX8808X/MAX8808Y/MAX8808Z linear chargers contain an internal linear regulator to supply the power for the IC. Bypass VL to GND with a 0.47µF ceramic capacitor. VL is regulated to 3.0V whenever the input voltage is above the battery voltage. CHG Charge-Indicator Output CHG is an open-drain output that indicates charge status.
PAGE 9
1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN Application Circuits Stand-Alone Li+ Charger The MAX8808X/MAX8808Y/MAX8808Z provide a complete Li+ charging solution. Figure 3 shows a standalone Li+ battery charger. The 2.8kΩ resistor connected to ISET sets a charging current of 465mA. The LED connected to the CHG output indicates when either fast-charge or precharge qualification has begun.
PAGE 10
MAX8808X/MAX8808Y/MAX8808Z 1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN USB-Powered Li+ Charger The universal serial bus (USB) provides a high-speed serial communication port as well as power for the remote device. The MAX8808X/MAX8808Y/MAX8808Z can be configured to charge a battery at the highest current possible from the host port. Figure 5 shows the MAX8808X as a USB battery charger.
PAGE 11
1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN Chip Information ACOK CHG 8 EN (EN) TOP VIEW BATT PROCESS: BiCMOS 7 6 5 2 3 4 GND ISET IN 1 VL MAX8808 TDFN ( ) INDICATES THE MAX8808Y.
PAGE 12
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 8L TDFN EXPOSED PADS.EPS MAX8808X/MAX8808Y/MAX8808Z 1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN PACKAGE OUTLINE 8L TDFN EXPOSED PAD, 2x2x0.
PAGE 13
1A Linear Li+ Battery Chargers with Integrated Pass FET and Thermal Regulation in 2mm x 2mm TDFN COMMON DIMENSIONS SYMBOL MIN. MAX. A 0.70 0.80 D 1.90 2.10 E 1.90 2.10 A1 0.00 0.05 L 0.20 0.40 k 0.25 MIN. A2 0.20 REF. PACKAGE VARIATIONS PKG. CODE N D2 E2 e T822-1 8 0.70±0.10 1.30±0.10 0.50 TYP. JEDEC SPEC b [(N/2)-1] x e DOWNBONDS ALLOWED MO229 0.25±0.05 1.50 REF NO PACKAGE OUTLINE 8L TDFN EXPOSED PAD, 2x2x0.