LTC4099 datasheet(32/52 Pages) LINER

32 / 52 page

LTC4155

4155fc

OPERATION

Figure 7. Battery Charger Flow Chart

Figure 8. Standard Thermistor Network

CLEAR LOW BATTERY

AND SAFETY TIMERS

NTC OUT-OF-RANGE

INDICATE NTC FAULT

CHARGE AT

CONSTANT CURRENT

PAUSE SAFETY TIMER

CHARGE AT

FIXED VOLTAGE

RUN SAFETY TIMER

RUN LOW BATTERY TIMER

POWER AVAILABLE

TIMER > 30 MINUTES

SAFETY TIMER

EXPIRED

VBAT > 2.8V

VBAT < VRECHRG

IBAT < C/x

YES

VBAT > VFLOAT –

VBAT < 2.8V

2.8V < VBAT < VFLOAT –

STOP CHARGING

INDICATE BATTERY FAULT

VBAT RISING

THROUGH VRECHRG

BAT FALLING

THROUGH VRECHRG

INDICATE CHARGING

STOPPED

INDICATE CONSTANT

VOLTAGE, I < C/x

4155 F07

YES

TIMER IN 8 HOUR -

C/x MODE

YES

VBAT

INDICATE

CONSTANT CURRENT

INDICATE CONSTANT

VOLTAGE, I > C/x

INDICATE LOW CELL VOLTAGE

TRICKLE CHARGE (8%)

RNTC

RBIAS

LTC4155

4155 F08

NTC

NTCBIAS

LTC4099 데이터시트(PDF) 32 Page - Linear Technology

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