MAX1757 Maxim, MAX1757 Datasheet - Page 10

• Manufacturer Part Number: MAX1757
• Description: Stand-Alone / Switch-Mode Li Battery Charger with Internal 14V Switch
• Manufacturer: Maxim

Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
10
Table 1. Charging State Table
Reset
Prequalification
Fast Charge
(Constant Current)
Full Charge
(Constant Voltage)
Top-Off
(Constant Voltage)
Done
Over/Undertemperature
Fault
______________________________________________________________________________________
STATE
From initial power on
From done state if battery voltage < recharge voltage
threshold
V
V
From reset state if input power, reference, and internal
bias are within limits
From prequalification state if battery voltage >
undervoltage threshold
From fast-charge state if battery voltage = battery
regulation voltage
From full-charge state if full-charge timer expires
If charging current ≤ 330mA
From top-off state if top-off timer expires
From fast-charge state or full-charge state if battery
temperature is outside limits
From reset state if battery temperature ≥ maximum
battery temperature
From prequalification state if prequalification timer expires
From fast-charge state if fast-charge timer expires
DCIN
BATT
- V
> battery overvoltage threshold
BATT
< dropout threshold
ENTRY CONDITIONS
or
or
or
or
or
or
Timers reset, charging current = 0,
FASTCHG = high, FULLCHG = high,
FAULT = high
Battery voltage ≤ undervoltage threshold,
charging current = (fast-charge current / 10),
timeout = 7.5min typ (C
FASTCHG = low, FULLCHG = high,
FAULT = high
Undervoltage threshold ≤ battery voltage
≤ battery regulation voltage,
charging current = charge current limit,
timeout = 90min typ (C
FASTCHG = low, FULLCHG = high,
FAULT = high
Battery voltage = battery regulation
voltage,
charging current ≤ 330mA,
timeout = 90min typ (C
FASTCHG = high, FULLCHG = low,
FAULT = high
Battery voltage = battery regulation voltage,
charging current ≤ 330mA
timeout = 45min typ
(C
FULLCHG = high, FAULT = high
Recharge voltage threshold ≤ battery,
voltage ≤ voltage limit, charging current = 0,
FASTCHG = high, FULLCHG = high,
FAULT = high
Charge current = 0, timers suspended,
FASTCHG = no change,
FULLCHG = no change,
FAULT = no change
Charging current = 0, FASTCHG = high,
FULLCHG = high, FAULT = low
TIMER1
= 1nF), FASTCHG = high,
STATE CONDITIONS
TIMER2
TIMER1
TIMER1
= 1nF),
= 1nF),
= 1nF),