Rainbow Electronics MAX1507 User Manual

General Description

The MAX1507 is an intelligent, stand-alone constant-cur­rent, constant-voltage (CCCV), thermally regulated linear
charger for a single-cell lithium-ion (Li+) battery. The
MAX1507 integrates the current-sense circuit, MOS pass
element, and thermal-regulation circuitry, and also elimi­nates the reverse-blocking Schottky diode to create the
simplest and smallest charging solution for hand-held
equipment.

The MAX1507 functions as a stand-alone charger to
control the charging sequence from the prequalification
state through fast-charge, top-off charge, and full­charge indication.

Proprietary thermal-regulation circuitry limits the die
temperature when fast charging or while exposed to
high ambient temperatures, allowing maximum charg­ing current without damaging the IC.

The MAX1507 achieves high flexibility by providing an
adjustable fast-charge current and thermal regulation
setpoints. Other features include the charging status
(CHG) of the battery and an active-low control input (EN).

The MAX1507 accepts a +4.25V to +13V supply, but dis­ables charging when the input voltage exceeds +7V to
protect against unqualified or faulty AC adapters. The
MAX1507 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 pack­age 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 Programmable Die-Temperature

Regulation Control (+90°C, +100°C, and +130°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 (VL) and

Charge-Enable Input (EN)

♦ Soft-Start Limits Inrush Current
♦ Charge Status Output (CHG) for LED or

Microprocessor Interface

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

0.8mm High

MAX1507

Linear Li+ Battery Charger with Integrated Pass FET

and Thermal Regulation in 3mm x 3mm Thin DFN

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

Typical Operating Circuit

19-2899; Rev 0; 6/03

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.

PART TEMP RANGE PIN-PACKAGE

MAX1507ETA -40°C to +85°C 8 Thin DFN-EP* AGW

TOP

MARK

TOP VIEW

3mm x 3mm THIN DFN

BATT

TEMP

CHG

8

76

MAX1507

3

2

1

IN

VL

GND

INPUT

4.25V TO 13V

EN

5

4

ISET

ON

IN

1µF

MAX1507

CHG

OFF

EN

VL

0.47µF

BATT

1µF

ISET

TEMP

GND

Li+

4.2V

2.80kΩ

MAX1507

Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFN

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= 5V, V

BATT

= 4.0V, TEMP = EN = CHG = unconnected, R

ISET

= 2.8kΩ to GND, CVL= 0.47µF, BATT bypassed to GND with 1µF,

T

A

= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

IN, CHG to GND .....................................................-0.3V to +14V

VL, BATT, ISET, EN, TEMP to GND ..........................-0.3V to +6V

VL to IN...................................................................-14V to +0.3V

IN to BATT Continuous Current.............................................0.9A

Continuous Power Dissipation (T

A

= +70°C)

8-Pin TDFN (derate 24.4mW/°C above+70°C) ..........1951mW

Short-Circuit Duration.................................................Continuous

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Input Voltage Range 013V

Input Operating Range 4.25 6.50 V

ACOK Trip Point, IN

Overvoltage Lockout Trip Point

VL Output Voltage IVL = 100µA 3.3 V

VL Load Regulation IVL = 100µA to 2mA -71 -200 mV

VL Temperature Coefficient IVL = 100µA -2 mV/°C

VL Undervoltage Lockout Trip Point

BATT Input Current

Maximum RMS Charge Current 0.8 A

Battery Regulation Voltage I

BATT Removal Detection Threshold V

PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN - V

V

IN

VIN rising 6.5 7 7.5

V

IN

Charging (IIN - I
Disabled, EN = VL 0.8 1.5IN Input Current

OFF state (V

VIN rising 2.95

Hysteresis 0.17

V

IN

EN = VL 4 10

BATT

BATT

, VIN rising 20 40 60

BATT

- V

, VIN falling 15 30 45

BATT

hysteresis 0.11

= 0 to 4V 3 10

= 0

rising 4.4 4.67 4.9 V

)12

BATT

= V

IN

= 4.0V) 0.065

BATT

= 0°C to +85°C 4.162 4.2 4.238

T

A

= -40°C to +85°C 4.150 4.2 4.250

T

A

mV

V

mA

V

µA

V

MAX1507

Linear Li+Battery Charger with Integrated Pass FET

and Thermal Regulation in 3mm x 3mm Thin DFN

_______________________________________________________________________________________ 3

Note 1: Limits are 100% production tested at TA= +25°C. Limits over operating temperature range are guaranteed through correla-

tion using statistical quality control (SQC) methods.

ELECTRICAL CHARACTERISTICS (continued)

(VIN= 5V, V

BATT

= 4.0V, TEMP = EN = CHG = unconnected, R

ISET

= 2.8kΩ to GND, CVL= 0.47µF, BATT bypassed to GND with 1µF,

T

A

= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

BATT Removal Detection-Threshold Hysteresis 200 mV

Minimum BATT Bypass Capacitance 1 µF/A

Fast-Charge Current-Loop System Accuracy V

Precharge Current System Accuracy

V

Precharge Threshold Voltage V

BATT

Current-Sense Amplifier Gain, I
in Fast Charge Mode

Regulator Dropout Voltage (V

EN Logic Input Low Voltage 4.25V < VIN < 6.5V 0.52 V
EN Logic Input High Voltage 4.25V < VIN < 6.5V 1.3 V
EN Internal Pulldown Resistor 100 200 400 kΩ
CHG Output Low Current V

CHG Output High Leakage Current V

Full Battery Detection Current Threshold
(as a Percentage of the Fast-Charge Current)

PARAMETER CONDITIONS MIN TYP MAX UNITS

= 3.5V 478 520 562 mA

BATT

Percentage of the fast-charge current,

= 2.2V

V

BATT

TEMP = VL 130

TEMP = floating 100Die-Temperature-Regulation Set Point

TEMP = GND 90

rising 2.3 2.5 2.7 V

BATT

to I

SET

IN

BATT

- V

)V

BATT

= 500mA, V

I

BATT

= 4.1V, I

BATT

= 1V 5 12 20 mA

CHG

= 13V

CHG

falling 5 10 15 %

I

BATT

51015%

= 1.4V 0.880 0.958 1.035 mA/A

ISET

= 425mA 130 200 mV

BATT

TA = +25°C1

T

= +85°C 0.002

A

°C

µA

MAX1507

Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFN

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VIN= 5V, V

BATT

= 4.0V, TEMP = EN = CHG = unconnected, R

ISET

= 2.8kΩ to GND, CIN= 1µF, C

BATT

= 1µF, CVL= 0.47µF, TA=

+25°C, unless otherwise noted.)

0

0.5

1.0

1.5

2.0

SUPPLY CURRENT

vs. INPUT VOLTAGE

MAX1507 toc01

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

0

6

8

2

410

12

I

BATT

= 0

0

0.5

1.0

1.5

2.0

DISABLED-MODE SUPPLY

CURRENT vs. INPUT VOLTAGE

MAX1507 toc02

INPUT VOLTAGE (V)

DISABLED-MODE SUPPLY CURRENT (mA)

0

EN = VL

6

8

4210

12

200

100

400

300

500

600

0

150

50

350

250

450

550

02.01.0 3.0 4.00.5 2.51.5 3.5 4.5

CHARGE CURRENT

vs. BATTERY VOLTAGE

MAX1507 toc03

BATTERY VOLTAGE (V)

CHARGE CURRENT (mA)

TEMP = VL

0

200

100

400

300

500

600

150

50

350

250

450

550

06824 101217935 1113

CHARGE CURRENT

vs. INPUT VOLTAGE

MAX1507 toc04

INPUT VOLTAGE (V)

CHARGE CURRENT (mA)

TEMP = VL

0

200

100

400

300

500

600

150

50

350

250

450

550

0 0.160.08 0.24 0.400.360.04 0.200.12 0.28 0.32

CHARGE CURRENT

vs. INPUT-VOLTAGE HEADROOM

MAX1507 toc05

VIN - V

BATT

(V)

CHARGE CURRENT (mA)

V

BATT

= 4.0V

4.186

4.180

4.198

4.192

4.204

4.210

4.189

4.183

4.201

4.195

4.207

-40 10-15 35 60 85

BATTERY REGULATION VOLTAGE

vs. TEMPERATURE

MAX1507 toc06

TEMPERATURE (°C)

BATTERY REGULATION VOLTAGE (V)

600

540

500

460

400

420

580

560

520

480

440

-40 10-15 356085

CHARGE CURRENT

vs. AMBIENT TEMPERATURE

MAX1507 toc07

AMBIENT TEMPERATURE (°C)

CHARGE CURRENT (mA)

TEMP = VL

0

300

700

500

900

200

100

600

400

800

1000

-40 10-15 35 60 85

CHARGE CURRENT

vs. AMBIENT TEMPERATURE (TEMP = VL)

MAX1507 toc08

AMBIENT TEMPERATURE (°C)

CHARGE CURRENT (mA)

V

BATT

= 4.0V

V

BATT

= 3.6V

R

ISET

= 1.87kΩ