Datasheet

LTC4085-3/LTC4085-4
13
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WALL PRESENT SUSPEND V
IN
> 3.8V V
IN
> (V
OUT
+ 100mV) V
IN
> (V
BAT
+ 100mV) CURRENT LIMIT ENABLED
YXX X X N
XYX X X N
XXNX X N
XXX N X N
XXX X N N
NNY Y Y Y
Table 1. Operating Modes—PowerPath States
Current Limited Input Power (IN to OUT)
Battery Charger (OUT to BAT)
WALL PRESENT SUSPEND V
OUT
> 4.35V V
OUT
> (V
BAT
+ 100mV) CHARGER ENABLED
XXN X N
XXX N N
XXYYY
Ideal Diode (BAT to OUT)
WALL PRESENT SUSPEND V
IN
V
BAT
> V
OUT
V
BAT
> 2.8V DIODE ENABLED
XXXXNN
XXXNXN
XXXYYY
Operating Modes—Pin Currents vs Programmed Currents (Powered from IN)
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
CL
– 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
CL
> I
CHG
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
OPERATION