LTC3576 Datasheet, PDF (25/48 Pages) Linear Technology – Switching Power Manager with USB On-the-Go + Triple Step-Down DC/DCs

OPERATION
LTC3576/LTC3576-1
Battery Charger Flow Chart
POWER ON/
ENABLE CHARGER
CLEAR EVENT TIMER
ASSERT CHRG LOW
YES
NTC OUT OF RANGE
NO
BAT < 2.85V
BATTERY STATE
BAT > V_FLOAT – E
CHARGE AT
100V/R_PROG (C/10 RATE)
2.85V < BAT < V_FLOAT – E
CHARGE AT
1030V/R_PROG RATE
CHARGE WITH
FIXED VOLTAGE
(V_FLOAT)
RUN EVENT TIMER
PAUSE EVENT TIMER
RUN EVENT TIMER
INHIBIT CHARGING
PAUSE EVENT TIMER
CHRG CURRENTLY ^YES
HIGH-Z
NO
INDICATE
NTC FAULT
AT CHRG
NO
TIMER > 30 MINUTES
YES
INHIBIT CHARGING
INDICATE BATTERY
FAULT AT CHRG
NO
BAT > 2.85V
YES
NO
TIMER > 4 HOURS
YES
STOP CHARGING
BAT RISING
YES
THROUGH
V_RECHRG
NO
BAT FALLING
YES
THROUGH
V_RECHRG
NO
CHRG HIGH-Z
NO
BAT < V_RECHRG
YES
NO
I_BAT < C/10
YES
CHRG HIGH-Z
3576 FLOW
3576f
25