Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Li-Ion, Li-Po TDFN 8 EP (3x3) Surface-mount

General Description

The MAX1508 is an intelligent, stand-alone constant-cur-

rent, constant-voltage (CCCV), thermally regulated linear

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

MAX1508 integrates the current-sense circuit, MOS pass

element, and thermal-regulation circuitry, and also elimi-

nates the reverse-blocking Schottky diode, to create the

simplest and smallest charging solution for hand-held

equipment.

The MAX1508 functions as a stand-alone charger to con-

trol the charging sequence from the prequalification state

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

cation. The MAX1508Y and MAX1508Z eliminate the pre-

qualification state to allow startup into a load without a

battery.

Proprietary thermal-regulation circuitry limits the die

temperature to +100°C when fast charging or while

exposed to high ambient temperatures, allowing maxi-

mum charging current without damaging the IC.

The MAX1508 achieves high flexibility by providing an

adjustable fast-charge current by an external resistor.

Other features include the charging status (CHG) of the

battery, an active-low control input (EN) for the

MAX1508 and MAX1508Z (active-high control input for

the MAX1508Y), and an active-low input power-source

detection output (ACOK).

The MAX1508 accepts a +4.25V to +13V supply, but dis-

ables charging when the input voltage exceeds +7V to

protect against unqualified or faulty AC adapters. The

MAX1508 operates over the extended temperature

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

8-pin thermally enhanced 3mm x 3mm thin DFN pack-

age with 0.8mm height.

Applications

Cellular and Cordless Phones

PDAs

Digital 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 (0.8A max)

♦ Proprietary Die-Temperature Regulation Control

(+100°C)

♦ +4.25V to +13V Input Voltage Range with Input

Overvoltage Protection (OVP) Above +7V

♦ Charge-Current Monitor for Fuel Gauging

♦ Low Dropout Voltage—130mV at 0.425A

♦ Input Power-Source Detection Output (ACOK)

♦ Soft-Start Limits Inrush Current

♦ No Prequalification State for the MAX1508Y and

MAX1508Z

♦ Charge Status Output (CHG) for LED or

Microprocessor Interface

♦ Small 3mm x 3mm 8-Pin Thin DFN Package,

0.8mm High

♦ Active-Low Charge Enable (EN) (MAX1508 and

MAX1508Z)

♦ Active-High Charge Enable (EN) (MAX1508Y)

MAX1508/MAX1508Y/MAX1508Z

Linear Li+ Battery Charger with Integrated Pass FET,

Thermal Regulation, and

ACOK

in 3mm x 3mm TDFN

________________________________________________________________ Maxim Integrated Products 1

ACOK

EN (EN)

ISET

CHG

BATT

GND

3mm x 3mm THIN DFN

TOP VIEW

MAX1508

MAX1508Y

MAX1508Z

( ) ARE FOR THE MAX1508Y ONLY

Pin Configuration

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

TOP

MARK

MAX1508ETA-T

-40°C to +85°C8 Thin DFN-EP*

AHF

MAX1508ETA+T

-40°C to +85°C8 Thin DFN-EP*

AHF

19-2890; Rev 2; 8/05

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.

EVALUATION KIT

AVAILABLE

Bluetooth is a trademark of Ericsson.

*EP = Exposed paddle.

+Denotes lead-free package.

Ordering Information continued at end of data sheet.

Typical Operating Circuit appears at end of data sheet.

Summary of content (11 pages)

PAGE 1
9-2890; Rev 2; 8/05 KIT ATION EVALU E L B A AVAIL Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN ♦ Soft-Start Limits Inrush Current ♦ No Prequalification State for the MAX1508Y and MAX1508Z ♦ Charge Status Output (CHG) for LED or Microprocessor Interface ♦ Small 3mm x 3mm 8-Pin Thin DFN Package, 0.
PAGE 2
MAX1508/MAX1508Y/MAX1508Z Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN ABSOLUTE MAXIMUM RATINGS IN, CHG to GND .....................................................-0.3V to +14V VL, BATT, ISET, EN, EN, ACOK to GND ..................-0.3V to +6V VL to IN...................................................................-14V to +0.3V IN to BATT Continuous Current.............................................0.
PAGE 3
Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN (VIN = 5V, VBATT = 4.0V, ACOK = EN = CHG = unconnected (for the MAX1508 and MAX1508Z), EN = VL (for the MAX1508Y,) RISET = 2.8kΩ to GND, CVL = 0.47µF, BATT bypassed to GND with 1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
Typical Operating Characteristics (VIN = 5V, VBATT = 4.0V, ACOK = EN = CHG = unconnected, EN = VL (MAX1508Y), RISET = 2.8kΩ to GND, CIN = 1µF, CBATT = 1µF, CVL = 0.47µF, TA = +25°C, unless otherwise noted.) 1.0 0.5 EN = VL (MAX1508/1508Z) EN = GND (MAX1508Y) 1.5 1.0 0.5 4 6 8 10 12 0 2 4 6 8 0 1 2 3 4 INPUT VOLTAGE (V) INPUT VOLTAGE (V) BATTERY VOLTAGE (V) CHARGE CURRENT vs. INPUT VOLTAGE CHARGE CURRENT vs. INPUT-VOLTAGE HEADROOM BATTERY REGULATION VOLTAGE vs.
PAGE 5
Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN PIN NAME 1 VL Internally Generated Logic Supply for Chip. Bypass VL to GND with a 0.47µF capacitor. 2 IN Input Supply Voltage. Bypass IN to GND with a 1µF capacitor to improve line noise and transient rejection. 3 GND Ground. Connect GND and exposed pad to a large copper trace for maximum power dissipation. 4 ISET Charge-Current Program and Fast-Charge Current Monitor.
PAGE 6
MAX1508/MAX1508Y/MAX1508Z Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN CHG Charge Indicator Output Soft-Start CHG is an open-drain current source for indicating charge status. Table 1 describes the state of CHG during different stages of operation. CHG is a nominal 12mA current source suitable for driving a charge-indication LED.
PAGE 7
Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN MAX1508/MAX1508Y/MAX1508Z ASYNCHRONOUS FROM ANYWHERE VIN > 7V + VBATT > VIN + EN = HIGH SHUTDOWN VBATT < 2.5V ND V A AND 7 T < V IN > V BAT V IN = LOW EN PRECHARGE 10% CHARGE CURRENT LED = ON (MAX1508 ONLY) CHARGER = OFF LED = OFF VIN > 7V + VBATT > VIN + EN = HIGH VBATT < 2.4V VBATT > 2.
PAGE 8
MAX1508/MAX1508Y/MAX1508Z Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN Capacitor Selection Connect a ceramic capacitor from BATT to GND for proper stability. Use a 1µF X5R ceramic capacitor for most applications. Connect a 1µF ceramic capacitor from IN to GND. Use a larger input bypass capacitor for high input voltages or high charging currents to reduce supply noise. Connect a 0.47µF ceramic capacitor from VL to GND.
PAGE 9
Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN MAX1508/MAX1508Y/MAX1508Z 4.2V Li+ IN AC/DC ADAPTER BATT 1µF 1µF MAX1508 MAX1508Y GND MAX1508Z CHG VI/O SYSTEM VL ACOK ISET EN (EN) 0.47µF 2.8kΩ CHARGE-CURRENT MONITOR VI/O LOW: CHARGE, HIGH: FULL OR OFF ( ) ARE FOR THE MAX1508Y ONLY Figure 3. µP-Interfaced Li+ Battery Charger 4.2V Li+ VBUS IN BATT 1µF 1µF GND CHG MAX1508 MAX1508Y MAX1508Z VL VI/O GND SYSTEM ACOK 0.
PAGE 10
Ordering Information (continued) PART TEMP RANGE PIN-PACKAGE TOP MARK MAX1508YETA-T -40°C to +85°C 8 Thin DFN-EP* AIL MAX1508YETA+T -40°C to +85°C 8 Thin DFN-EP* AIL MAX1508ZETA-T -40°C to +85°C 8 Thin DFN-EP* AIK MAX1508ZETA+T -40°C to +85°C 8 Thin DFN-EP* AIK Typical Operating Circuit INPUT 4.25V TO 13V IN BATT Li+ 4.2V 1µF 1µF MAX1508 MAX1508Y MAX1508Z CHG ISET OFF *EP = Exposed paddle. +Denotes lead-free package. EN (EN) ON VL ACOK 2.80kΩ GND 0.
PAGE 11
Linear Li+ Battery Charger with Integrated Pass FET, Thermal Regulation, and ACOK in 3mm x 3mm TDFN COMMON DIMENSIONS MIN. MAX. D 0.70 2.90 0.80 3.10 E A1 2.90 0.00 3.10 0.05 L k 0.20 0.40 0.25 MIN. A2 0.20 REF. SYMBOL A PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e DOWNBONDS ALLOWED T633-1 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF NO T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF NO T833-1 8 1.50±0.