FAN54300 Datasheet, PDF (27/43 Pages) Fairchild Semiconductor – USB-Compliant, Dual-Power Input, Single-Cell, Li-Ion Switching Charger with USB-OTG Boost Regulator

CHARGE STATE
VBAT < VSHORT
NO
PWRIN OK?
YES
Disable Charging
Indicate
PWRIN Fault
Enable ISHORT ,
Reset Safety Reg
Indicate Charging
YES
PWM Charging
Indicate Charging
NO
PWRIN OK?
YES
t15MIN
Timeout?
NO
Disable Charging
Indicate
PWRIN Fault
t15MIN
Timeout?
NO
YES
YES
Indicate Timer Fault
Set CE#
NO
NO
Charge
Configuration
State
NO
Charge
Configuration
State
IOUT < ITERM
Termination enabled
VBAT > VOREG–VRCH
YES
Stop Charging
Enable IDET for tDETECT
HIGHZ Mode
Indicate Charge
Complete
VBAT < VOREG–VRCH
YES
NO
VBAT < VOREG–VRCH
YES
Reset Safety Reg
Delay tINT
Battery Removed
Reset Charge
Parameters
Figure 49. Charge Mode Flow Chart
HZ State
T32Sec
ARMED AND
CE# = 0?
YES Charge State
DISABLE
PIN
LOW
Stop t32SEC
HIGH
Reset t15MIN
if running
NO
NO
Has t15MIN
and CE# = 0
START t15MIN
YES
NO
VBAT < VOREG
for 262 ms?
YES
Figure 50. Charge Configuration Flow Chart
RUN
t32SEC
NO
HZ or CE# set?
YES
VBAT > VLOWV?
YES
HIGH
NO
DISABLE
PIN
LOW
Charge State
Figure 51. HZ-State Flow Chart
© 2010 Fairchild Semiconductor Corporation
FAN54300 • Rev. 1.0.4
27
www.fairchildsemi.com