MAX1879EUA-T Maxim Integrated Products, MAX1879EUA-T Datasheet - Page 7

• Manufacturer Part Number: MAX1879EUA-T
• Description: Battery Management 1-Cell Li+ Pulse Charger
• Manufacturer: Maxim Integrated Products

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Simple, Efficient, 1-Cell Li+ Pulse Charger
V
V
BATT
BATT
< 2.5V
< 2.5V
CHARGING POWER REMOVED
(FROM ANY STATE)
(LED: 50% DUTY CYCLE, 2Hz)
TOP-OFF QUALIFICATION
CHARGE QUALIFICATION
PMOS FET: OFF
LED: ON
PMOS FET: OFF
LED: OFF
TEMPERATURE NOT OK
TEMPERATURE NOT OK
(LED: OFF)
8.0mA PRECHARGE: ON
PMOS FET: OFF
LED: 50% DUTY CYCLE, 2Hz
TEMPERATURE NOT OK
PREQUALIFICATION
OR V
BATT
EVERY 9S
< 2.5V
2.5V < V
EVERY 9s
PMOS FET: OFF
LED: OFF
SHUTDOWN
V
BATT
BATT
< 4.2V
TEMPERATURE OK
> 2.2V
TEMPERATURE OK
PMOS FET: PULSED
LED: ON
PMOS FET: PULSED
LED: OFF
V
8.0mA PRECHARGE: ON
PMOS FET: OFF
LED: OFF
BATT
TOP-OFF
CHARGE
POWER-ON RESET
CHARGING POWER
< 2.5V
V
BATT
APPLIED
BATT REGULATION VOLTAGE
(e.g., 4.2V) HAS BEEN REACHED
AND
4.2V
FET OFF-TIME
FET ON-TIME
TOTAL TIME = 6.25hr
Simplified State Diagram
(ASYNCHRONOUSLY, FROM ANY STATE)
BATT NOT INSTALLED OR V
<
V
BATT
1
8
< 4.0V OR PULL THERM HIGH
PMOS FET: OFF
LED: OFF
V
BATT
DONE
> 4.0V
BATT
< 2.2V
7