锂电池充电管理芯片MAX1908-MAX8765A数据手册及典型应用

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General Description

The MAX1908/MAX8724/MAX8765/MAX8765A highly

integrated, multichemistry battery-charger control ICs

simplify the construction of accurate and efficient charg-

ers. These devices use analog inputs to control charge

current and voltage, and can be programmed by the host

or hardwired. The MAX1908/MAX8724/MAX8765/

MAX8765A achieve high efficiency using a buck topology

with synchronous rectification.

The MAX1908/MAX8724/MAX8765/MAX8765A feature

input current limiting. This feature reduces battery

charge current when the input current limit is reached

to avoid overloading the AC adapter when supplying

the load and the battery charger simultaneously. The

MAX1908/MAX8724/MAX8765/MAX8765A provide out-

puts to monitor current drawn from the AC adapter (DC

input source), battery-charging current, and the pres-

ence of an AC adapter. The MAX1908’s conditioning

charge feature provides 300mA to safely charge deeply

discharged lithium-ion (Li+) battery packs.

The MAX1908 includes a conditioning charge feature

while the MAX8724/MAX8765/MAX8765A do not.

The MAX1908/MAX8724/MAX8765/MAX8765A charge two

to four series Li+ cells, providing more than 5A, and are

available in a space-saving, 28-pin, thin QFN package (5mm

× 5mm). An evaluation kit is available to speed designs.

Applications

Notebook and Subnotebook Computers

Personal Digital Assistants

Handheld Terminals

Features

o ±0.5% Output Voltage Accuracy Using Internal

Reference (±0.4% for MAX8765A, 2-/3-Cell Only)

o ±4% Accurate Input Current Limiting

o ±5% Accurate Charge Current

o Analog Inputs Control Charge Current and

Charge Voltage

o Outputs for Monitoring

Current Drawn from AC Adapter

Charging Current

AC Adapter Presence

o Up to 17.6V Battery-Voltage Set Point

o Maximum 28V Input Voltage

o > 95% Efficiency

o Shutdown Control Input

o Charge Any Battery Chemistry

Li+, NiCd, NiMH, Lead Acid, etc.

MAX1908/MAX8724/MAX8765/MAX8765A

Low-Cost Multichemistry Battery Chargers

________________________________________________________________

Maxim Integrated Products

IINP

CSSP

CSSN

DHI

BST

DLOV

SHDN

ICHG

ACIN

ACOK

REFIN

ICTL

GND

15161718192021

VCTL

BATT

CELLS

CSIN

CSIP

PGND

DLO

7654321

CCV

CCI

CCS

REF

CLS

LDO

DCIN

MAX1908

MAX8724

MAX8765

MAX8765A

THIN QFN

TOP VIEW

Pin Configuration

Ordering Information

MAX1908

MAX8724

MAX8765

MAX8765A

AC ADAPTER

INPUT

TO EXTERNAL

LOAD

LDO

FROM HOST µP

10µH

0.015Ω

BATT+

DCIN

REFIN

VCTL

ICTL

ACIN

ACOK

SHDN

ICHG

IINP

CCV

CCI

CCS

CELLS

LDO

BST

DLOV

DHI

DLO

PGND

CSIP

CSIN

BATT

REF CLS

GND

CSSP CSSN

0.01Ω

Minimum Operating Circuit

19-2764; Rev 5; 11/09

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX1908ETI+ -40°C to +85°C 28 Thin QFN-EP*

MAX8724ETI+ -40°C to +85°C 28 Thin QFN-EP*

MAX8765ETI+ -40°C to +85°C 28 Thin QFN-EP*

MAX8765AETI+ -40°C to +85°C 28 Thin QFN-EP*

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

MAX1908/MAX8724/MAX8765/MAX8765A

Low-Cost Multichemistry Battery Chargers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

DCIN

= V

CSSP

= V

CSSN

= 18V, V

BATT

= V

CSIP

= V

CSIN

= 12V, V

REFIN

= 3V, V

VCTL

= V

ICTL

= 0.75 x V

REFIN

, CELLS = open, CLS =

REF, V

BST

- V

= 4.5V, ACIN = GND = PGND = 0, C

LDO

= 1µF, LDO = DLOV, C

REF

= 1µF; CCI, CCS, and CCV are compensated

per Figure 1a; T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

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.

DCIN, CSSP, CSSN, ACOK to GND.......................-0.3V to +30V

BST to GND ............................................................-0.3V to +36V

BST to LX..................................................................-0.3V to +6V

DHI to LX...................................................-0.3V to (V

BST

+ 0.3V)

LX to GND .................................................................-6V to +30V

BATT, CSIP, CSIN to GND .....................................-0.3V to +20V

CSIP to CSIN or CSSP to CSSN or

PGND to GND ....................................................-0.3V to +0.3V

CCI, CCS, CCV, DLO, ICHG,

IINP, ACIN, REF to GND.......................-0.3V to (V

LDO

+ 0.3V)

DLOV, VCTL, ICTL, REFIN, CELLS, CLS,

LDO, SHDN to GND .............................................-0.3V to +6V

DLOV to LDO.........................................................-0.3V to +0.3V

DLO to PGND .........................................-0.3V to (V

DLOV

+ 0.3V)

LDO Short-Circuit Current...................................................50mA

Continuous Power Dissipation (T

= +70°C)

28-Pin Thin QFN (5mm × 5mm)

(derate 20.8mW/°C above +70°C) .........................1666.7mW

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

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

Storage Temperature Range .............................-60°C to +150°C

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CHARGE-VOLTAGE REGULATION

VCTL

= V

REFIN

-0.5 +0.5

VCTL

= V

REFIN

/20 -0.5 +0.5

Battery-Regulation Voltage

Accuracy

(MAX1908/MAX8724/MAX8765

(2, 3, or 4 Cells) and MAX8765A

(4 Cells Only))

VCTL

= V

LDO

-0.5 +0.5

VCTL

= V

REFIN

-0.4 +0.4

VCTL

= V

REFIN

/20 -0.4

+0.4

Battery-Regulation Voltage

Accuracy (MAX8765A, 2 or 3

Cells Only)

VCTL

= V

LDO

-0.4

+0.4

VCTL Default Threshold V

VCTL

rising 4.0 4.1 4.2 V

REFIN Range (Note 1) 2.5 3.6 V

REFIN Undervoltage Lockout V

REFIN

falling 1.20 1.92 V

CHARGE-CURRENT REGULATION

CSIP-to-CSIN Full-Scale Current-

Sense Voltage

ICTL

= V

REFIN

71.25 75 78.75 mV

ICTL

= V

REFIN

-5 +5

ICTL

= V

REFIN

x 0.6 -5 +5

ICTL

= V

LDO

-6 +6

MAX8765/MAX8765A only; V

ICTL

= V

REFIN

0.036

-45 +45

Charging-Current Accuracy

MAX8724 only; V

ICTL

= V

REFIN

x 0.058 -33 +33

Charge-Current Gain Error

(MAX8765/MAX8765A Only)

-2 +2 %

Charge-Current Offset

(MAX8765/MAX8765A Only)

-2 +2 mV

ICTL Default Threshold V

ICTL

rising 4.0 4.1 4.2 V

BATT/CSIP/CSIN Input Voltage

Range

0 19 V

MAX1908/MAX8724/MAX8765/MAX8765A

Low-Cost Multichemistry Battery Chargers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

DCIN

= V

CSSP

= V

CSSN

= 18V, V

BATT

= V

CSIP

= V

CSIN

= 12V, V

REFIN

= 3V, V

VCTL

= V

ICTL

= 0.75 x V

REFIN

, CELLS = open, CLS =

REF, V

BST

- V

= 4.5V, ACIN = GND = PGND = 0, C

LDO

= 1µF, LDO = DLOV, C

REF

= 1µF; CCI, CCS, and CCV are compensated

per Figure 1a; T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DCIN

= 0V or V

ICTL

= 0V or V

SHDN

= 0V

CSIP/CSIN Input Current

Charging 400

650

µA

Cycle-by-Cycle Maximum Current

Limit

RS2 = 0.015mΩ 6.0 6.8 7.5

ICTL Power-Down Mode

Threshold Voltage

(MAX1908/MAX8724 Only)

VCTL

rising

REFIN/

100

REFIN/

VCTL

= V

ICTL

= 0 or 3V -1 +1

ICTL, VCTL Input Bias Current

DCIN

= 0V, V

VCTL

= V

ICTL

= V

REFIN

= 5V -1 +1

µA

DCIN

= 5V, V

REFIN

= 3V -1 +1

REFIN Input Bias Current

REFIN

= 5V -1 +1

µA

ICHG Transconductance

(MAX1908/MAX8724 Only)

ICHG

CSIP

- V

CSIN

= 45mV 2.7 3 3.3 µA/mV

ICHG Transconductance

(MAX8765/MAX8765A Only)

ICHG

CSIP

- V

CSIN

= 45mV 2.85 3 3.15 µA/mV

ICHG Transconductance Error

(MAX8765/MAX8765A Only)

-5 +5 %

ICHG Transconductance Offset

(MAX8765/MAX8765A Only)

-5 +5 µA

CSIP

- V

CSIN

= 75mV -6 +6

CSIP

- V

CSIN

= 45mV -5 +5 ICHG Accuracy

CSIP

- V

CSIN

= 5mV -40 +40

ICHG Output Current V

CSIP

- V

CSIN

= 150mV, V

ICHG

= 0V 350 µA

ICHG Output Voltage V

CSIP

- V

CSIN

= 150mV, ICHG

= open 3.5 V

INPUT-CURRENT REGULATION

CSSP-to-CSSN Full-Scale

Current-Sense Voltage

72 75 78 mV

CLS

= V

REF

-4 +4

CLS

= V

REF

/2 -7.5 +7.5

Input Current-Limit Accuracy

CLS

= 1.1V (MAX8765/MAX8765A only) -10 +10

Input Current-Limit Gain Error

(MAX8765/MAX8765A Only)

-2 +2 %

Input Current-Limit Offset

(MAX8765/MAX8765A Only)

-2 +2 mV

CSSP, CSSN Input Voltage

Range

8 28 V

DCIN

= 0V 0.1 1

CSSP, CSSN Input Current

(MAX1908/MAX8724 Only)

CSSP

= V

CSSN

= V

DCIN

> 8V 350 600

µA

DCIN

= 0V 0.1 1

CSSP Input Current

(MAX8765/MAX8765A Only)

CSSP

= V

CSSN

= 28V

DCIN

= 28V

400 650

µA

MAX1908/MAX8724/MAX8765/MAX8765A

Low-Cost Multichemistry Battery Chargers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

DCIN

= V

CSSP

= V

CSSN

= 18V, V

BATT

= V

CSIP

= V

CSIN

= 12V, V

REFIN

= 3V, V

VCTL

= V

ICTL

= 0.75 x V

REFIN

, CELLS = open, CLS =

REF, V

BST

- V

= 4.5V, ACIN = GND = PGND = 0, C

LDO

= 1µF, LDO = DLOV, C

REF

= 1µF; CCI, CCS, and CCV are compensated

per Figure 1a; T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DCIN

= 0V 0.1 1

CSSN Input Current

(MAX8765/MAX8765A Only)

CSSP

= V

CSSN

= 28V

DCIN

= 28V 0.1 1

µA

CLS Input Range

(MAX1908/MAX8724 Only)

1.6 REF V

CLS Input Range

(MAX8765/MAX8765A Only)

1.1 REF V

CLS Input Bias Current V

CLS

= 2V -1 +1 µA

IINP Transconductance

(MAX1908/MAX8724 Only)

IINP

CSSP

- V

CSSN

= 75mV 2.7 3 3.3 µA/mV

CSSP

- V

CSSN

= 75mV -5 +5

IINP Accuracy

CSSP

- V

CSSN

= 37.5mV -7.5 +7.5

IINP Transconductance

(MAX8765/MAX8765A Only)

IINP

CSSP

- V

CCSN

= 75mV 2.82 3 3.18 µA/mV

IINP Transconductance Error

(MAX8765/MAX8765A Only)

-6 +6 %

IINP Transconductance Offset

(MAX8765/MAX8765A Only)

-10 +10 µA

IINP Output Current V

CSSP

- V

CSSN

= 150mV, V

IINP

= 0V 350 µA

IINP Output Voltage V

CSSP

- V

CSSN

= 150mV, V

IINP

= open 3.5 V

SUPPLY AND LDO REGULATOR

DCIN Input Voltage Range V

DCIN

8 28 V

DCIN

falling 7 7.4

DCIN Undervoltage-Lockout Trip

Point

DCIN

rising 7.5 7.85

DCIN Quiescent Current I

DCIN

8.0V < V

DCIN

< 28V 3.2 6 mA

BATT

= 19V, V

DCIN

= 0V 1

BATT Input Current I

BATT

= 2V to 19V, V

DCIN

= 19.3V 200 500

µA

LDO Output Voltage 8V < V

DCIN

< 28V, no load 5.25 5.4 5.55 V

LDO Load Regulation 0 < I

LDO

< 10mA 34 100 mV

LDO Undervoltage-Lockout Trip

Point

DCIN

= 8V 3.20 4 5.15 V

REFERENCE

REF Output Voltage 0 < I

REF

< 500µA 4.072 4.096 4.120 V

REF Undervoltage-Lockout Trip

Point

REF

falling 3.1 3.9 V

MAX1908/MAX8724/MAX8765/MAX8765A

Low-Cost Multichemistry Battery Chargers

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

DCIN

= V

CSSP

= V

CSSN

= 18V, V

BATT

= V

CSIP

= V

CSIN

= 12V, V

REFIN

= 3V, V

VCTL

= V

ICTL

= 0.75 x V

REFIN

, CELLS = open, CLS =

REF, V

BST

- V

= 4.5V, ACIN = GND = PGND = 0, C

LDO

= 1µF, LDO = DLOV, C

REF

= 1µF; CCI, CCS, and CCV are compensated

per Figure 1a; T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TRIP POINTS

DCIN

falling, referred to V

CSIN

(MAX1908/MAX8724 only)

50 100 150

BATT Power-Fail Threshold

CSSP

falling, referred to V

CSIN

(MAX8765/MAX8765A only)

50 100 150

BATT Power-Fail Threshold

Hysteresis

200 mV

ACIN rising (MAX8765/MAX8765A only) 2.028 2.048 2.068

ACIN Threshold

ACIN rising (MAX1908/MAX8724 only) 2.007 2.048 2.089

ACIN Threshold Hysteresis 0.5% of REF 20 mV

ACIN Input Bias Current V

ACIN

= 2.048V -1 +1 µA

SWITCHING REGULATOR

DHI Off-Time

BATT

= 16V, V

DCIN

= 19V,

CELLS

= V

REFIN

0.36 0.4 0.44 µs

DHI Minimum Off-Time

BATT

= 16V, V

DCIN

= 17V,

CELLS

= V

REFIN

0.24 0.28 0.33 µs

DHI Maximum On-Time 2.5 5 7.5 ms

DLOV Supply Current DLO low 5 10 µA

BST Supply Current DHI high 6 15 µA

BST Input Quiescent Current

DCIN

= 0V, V

BST

= 24.5V,

BATT

= V

= 20V

0.3 1 µA

LX Input Bias Current V

DCIN

= 28V, V

BATT

= V

= 20V

150 500 µA

LX Input Quiescent Current V

DCIN

= 0V, V

BATT

= V

= 20V 0.3 1 µA

DHI Maximum Duty Cycle 99 99.9 %

Minimum Discontinuous-Mode

Ripple Current

0.5 A

Battery Undervoltage Charge

Current

BATT

= 3V per cell (RS2 = 15mΩ),

MAX1908 only, V

BATT

rising

150 300 450 mA

CELLS = GND, MAX1908 only, V

BATT

rising 6.1 6.2 6.3

CELLS = open, MAX1908 only, V

BATT

rising

9.15 9.3 9.45

Battery Undervoltage Current

Threshold

CELLS = V

REFIN

, MAX1908 only, V

BATT

rising 12.2 12.4 12.6

DHI On-Resistance High V

BST

- V

= 4.5V, I

DHI

= +100mA 4 7 Ω

DHI On-Resistance Low V

BST

- V

= 4.5V, I

DHI

= -100mA 1 3.5 Ω

DLO On-Resistance High V

DLOV

= 4.5V, I

DLO

= +100mA 4 7 Ω

DLO On-Resistance Low V

DLOV

= 4.5V, I

DLO

= -100mA 1 3.5 Ω

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