MAX1925 datasheet(5/16 Pages) MAXIM

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Switch-Mode 1-Cell Li+ Chargers

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Note 1: When the AC adapter is unplugged or if the charger is shut down, BATT drain is less than 10µA.

Note 2: These specifications guarantee the thermistor interface detects a fault at the correct temperature (0°C to +5°C cold temper-

ature and 45°C to +50°C hot temperature) with Philips NTC Thermistor Series 640-6, 2322-640-63103, 10.0K at +25°C, ±5%

(or equivalent).

Note 3: A fault is generated if VTHRM lower than 1.4V during the cold test or higher than 1.4V during the hot test. Hot and cold tests

occur on alternate CT clock transitions.

Note 4: Specifications to -40°C are guaranteed by design and not production tested.

ELECTRICAL CHARACTERISTICS (continued)

(VPGND = VGND = 0, VINP = VIN = VCHG = 5V, VBATT = VCS = VEN = 4V, THRM = 10k

Ω to GND, CCT = 100nF, TA = -40°C to +85°C,

unless otherwise noted. Typical values are at TA = +25°C.) (Note 4)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

CHG Output High Leakage

Current

V CHG = 12V

µA

ACON High Leakage

V ACON = 12V

µA

ACON Sink Current

V ACON = 0.4V

THERMISTOR MONITOR

THRM Sense Current for Hot

Qualification

342

363

µA

THRM Sense Current for Cold

Qualification

47.3

50.3

µA

THRM Sense-Voltage Trip Point

(Note 3)

1.379

1.421

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