Datasheet

LTC4055/LTC4055-1
12
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OPERATION
Table 1. Operating Modes—PowerPath States Current Limited Input Power (IN1/IN2 to OUT)
WALL PRESENT SHUTDOWN SUSPEND V
IN
> 3.8V V
IN
> (V
OUT
+ 100mV) V
IN
> (V
BAT
+ 100mV) CURRENT LIMIT ENABLED
Y XXX X X N
X YXX X X N
X XYX X X N
XXXN X X N
X XXX N X N
X XXX X N N
NNNY Y Y Y
Input Powered Charger (IN1/IN2 to BAT)
WALL PRESENT SHUTDOWN SUSPEND V
IN
> 4.35V V
IN
> (V
OUT
+ 100mV) V
IN
> (V
BAT
+ 100mV) INPUT CHARGER ENABLED
Y XXX X X N
X YXX X X N
X XYX X X N
XXXN X X N
X XXX N X N
X XXX X N N
NNNY Y Y Y
Output Powered Charger (OUT to BAT)
WALL PRESENT SHUTDOWN SUSPEND V
IN
> 4.35V V
OUT
> (V
IN
+ 100mV) V
OUT
> (V
BAT
+ 100mV) OUTPUT CHARGER ENABLED
N XXX X X N
X YXX X X N
XXXN X X N
X XXX N X N
X XXX X N N
YNXY Y Y Y
Ideal Diode (BAT to OUT)
WALL PRESENT SHUTDOWN SUSPEND V
BAT
> 2.8V V
BAT
> V
OUT
V
IN
DIODE ENABLED
X YXX X X N
XXXN X X N
X XXX N X N
XNXY Y X Y
Table 2. Operating Modes —Pin Currents vs Programmed Currents (Charging from IN1/IN2)
PROGRAMMING OUTPUT CURRENT BATTERY CURRENT INPUT CURRENT
I
CL
= I
CHG
I
OUT
< I
CL
I
OUT
= I
CL
= I
CHG
I
OUT
> I
CL
I
BAT
= I
CHG
– I
OUT
I
BAT
= 0
I
BAT
= I
CL
– I
OUT
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
I
CHG
< I
CL
I
OUT
< (I
CL
– I
CHG
)
I
OUT
> (I
CL
– I
CHG
)
I
OUT
= I
CL
I
OUT
> I
CL
I
BAT
= I
CHG
I
BAT
= I
CL
– I
OUT
I
BAT
= 0
I
BAT
= I
CL
– I
OUT
I
IN
= I
Q
+ I
CHG
+ I
OUT
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
I
CL
< I
CHG
I
OUT
< I
CL
I
OUT
> I
CL
*
I
BAT
= I
CL
– I
OUT
I
BAT
= I
CL
– I
OUT
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
*Charge current shuts off when V
OUT
drops below V
BAT
, i.e., when I
OUT
exceeds I
CL
.