MAX1908 datasheet(2/27 Pages) MAXIM

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Low-Cost Multichemistry Battery Chargers

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VREFIN = 3V, VVCTL = VICTL = 0.75 x VREFIN, CELLS = float, CLS =

REF, VBST - VLX = 4.5V, ACIN = GND = PGND = 0, CLDO = 1µF, LDO = DLOV, CREF = 1µF; CCI, CCS, and CCV are compensated

per Figure 1a; TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +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 (VBST + 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 (VLDO + 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 (VDLOV + 0.3V)

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

Continuous Power Dissipation (TA = +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

VVCTL = VREFIN (2, 3, or 4 cells)

-0.5

+0.5

VVCTL = VREFIN / 20 (2, 3, or 4 cells)

-0.5

+0.5

Battery Regulation Voltage

Accuracy

VVCTL = VLDO (2, 3, or 4 cells)

-0.5

+0.5

VCTL Default Threshold

VVCTL rising

4.0

4.1

4.2

REFIN Range

(Note 1)

2.5

3.6

REFIN Undervoltage Lockout

VREFIN falling

1.20

1.92

CHARGE CURRENT REGULATION

CSIP-to-CSIN Full-Scale Current-

Sense Voltage

VICTL = VREFIN

71.25

78.75

VICTL = VREFIN

-5

VICTL = VREFIN x 0.6

-5

VICTL = VLDO

-6

Charging Current Accuracy

MAX8724 only: VICTL = VREFIN x 0.058

-33

+33

ICTL Default Threshold

VICTL rising

4.0

4.1

4.2

BATT/CSIP/CSIN Input Voltage

Range

VDCIN = 0 or VICTL = 0 or SHDN = 0

CSIP/CSIN Input Current

Charging

400

650

µA

Cycle-by-Cycle Maximum Current

Limit

IMAX

RS2 = 0.015

Ω

6.0

6.8

7.5

ICTL Power-Down Mode

Threshold Voltage

VICTL rising

REFIN /

100

REFIN /

VVCTL = VICTL = 0 or 3V

-1

ICTL, VCTL Input Bias Current

VDCIN = 0, VVCTL = VICTL= VREFIN = 5V

-1

µA

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