Datasheet

LTC4055/LTC4055-1
13
4055fb
OPERATION
• CURRENT LIMIT SWITCH FROM V
IN
TO V
OUT
—OFF
• BATTERY CHARGING ON • CHARGE CURRENT C/10 • V
IN
CHARGE SWITCH OPEN
• CHRG PULLED LOW
• ACPR PULLED LOW
V
OUT
CHARGING LOW BATTERY
• CURRENT LIMIT SWITCH FROM V
IN
TO V
OUT
—OFF
• BATTERY CHARGING ON • V
IN
CHARGE SWITCH OPEN
• CHRG PULLED LOW
• ACPR PULLED LOW
V
OUT
CHARGING BATTERY
• BATTERY CHARGING SUSPENDED • CHRG PULLED LOW
NTC FAULT
• CHARGING DISABLED • BATTERY POWERS V
OUT
UVLO
• CHARGING SUSPENDED • CHRG Hi-Z
BATTERY POWERS V
OUT
• CHARGING SUSPENDED • CHRG PULLED LOW
BATTERY POWERS V
OUT
TEMP OK AND BATTERY < 2.8V
TEMP NOT OK
4055 SD
• CURRENT LIMIT SWITCH FROM V
IN
TO V
OUT
—OFF
• ACPR PULLED LOW
V
OUT
POWERS PART
TEMP OK AND BATTERY > 2.8V
BATTERY > 4.1V (4.0V LTC4055-1) AND CHARGER TIMED OUT
TEMP NOT OK
BATTERY > 2.8V
BATTERY < 4.1V (4.0V LTC4055-1)
WALL ADAPTER PRESENT
WALL ADAPTER PRESENT
WALL ADAPTER PRESENT
POWER APPLIED TO V
IN
BATTERY < 2.8V
1/4 TIMEOUT AND BATTERY < 2.8V
1/4 TIMEOUT
AND
BATTERY < 2.8V
BATTERY > 4.1V
(4.0V LTC4055-1)
AND CHARGER
TIMED OUT
• BATTERY CHARGING ON • CHARGE CURRENT C/10 • V
OUT
CHARGE SWITCH OPEN
• CHRG PULLED LOW • BATTERY POWER TO V
OUT
IS OFF
V
IN
CHARGING LOW BATTERY
• CURRENT LIMIT SWITCH FROM V
IN
TO V
OUT
—ON
• BATTERY CHARGING ON • V
IN
CHARGE SWITCH OPEN
• CHRG PULLED LOW
V
IN
CHARGING BATTERY
• BATTERY CHARGING SUSPENDED • CHRG PULLED LOW
NTC FAULT
TEMP OK AND BATTERY < 2.8V
TEMP NOT OK
TEMP OK AND BATTERY > 2.8V
TEMP NOT OK
• CURRENT LIMIT SWITCH FROM V
IN
TO V
OUT
—ON
V
IN
POWERS PART
BATTERY < 2.8V
WALL ADAPTER PRESENT
BATTERY < 4.1V
(4.0V LTC4055-1)
BATTERY < 2.8V
BATTERY > 2.8V
(V
IN
AND V
OUT
) < UVLO
BATTERY > 2.8V
V
OUT
< V
BAT
V
OUT
> V
BAT
• CHRG IS Hi-Z • BATTERY POWER TO V
OUT
—DISABLED
BAD BATTERY
• CHRG IS Hi-Z • BATTERY POWER TO V
OUT
—DISABLED
LOW BATTERY
• CHRG IS Hi-Z • BATTERY POWER TO V
OUT
—DISABLED
BAD BATTERY
• CHARGING DISABLED • ALL SWITCHES OPEN
SHUTDOWN
SHUTDOWN
V
OUT
< V
BAT
V
OUT
> V
BAT
SHDN
Operational State Diagram