MAX1879EUA 参数 Datasheet PDF下载

Simple, Efficient, 1-Cell Li+ Pulse Charger

Simplified State Diagram

CHARGING POWER REMOVED

(FROM ANY STATE)

SHUTDOWN

PMOS FET: OFF

LED: OFF

CHARGING POWER

APPLIED

V

BATT

< 4.0V OR PULL THERM HIGH

MAX1879

V

BATT

> 2.2V

POWER-ON RESET

8.0mA PRECHARGE: ON

PMOS FET: OFF

LED: OFF

BATT NOT INSTALLED OR V

BATT

< 2.2V

(ASYNCHRONOUSLY, FROM ANY STATE)

PREQUALIFICATION

8.0mA PRECHARGE: ON

PMOS FET: OFF

LED: 50% DUTY CYCLE, 2Hz

TEMPERATURE

NOT OK

OR V

BATT

< 2.5V

2.5V < V

BATT

< 4.2V

V

BATT

4.2V

V

BATT

< 2.5V

V

BATT

> 4.0V

DONE

PMOS FET: OFF

LED: OFF

CHARGE

PMOS FET: PULSED

LED: ON

EVERY 9s

TEMPERATURE OK

V

BATT

< 2.5V

CHARGE QUALIFICATION

PMOS FET: OFF

LED: ON

BATT REGULATION VOLTAGE

(e.g., 4.2V) HAS BEEN REACHED

AND

FET ON-TIME

<

1

FET OFF-TIME

8

TEMPERATURE

NOT OK

(LED: 50% DUTY CYCLE, 2Hz)

EVERY 9S

TOP-OFF

PMOS FET: PULSED

LED: OFF

TOTAL TIME = 6.25hr

TEMPERATURE OK

V

BATT

< 2.5V

TOP-OFF QUALIFICATION

PMOS FET: OFF

LED: OFF

TEMPERATURE

NOT OK

(LED: OFF)

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