LTC4055 Linear Technology, LTC4055 Datasheet - Page 12

• Manufacturer Part Number: LTC4055
• Description: USB Power Controller and Li-Ion Linear Charger
• Manufacturer: Linear Technology

OPERATIO
LTC4055
Table 1. Operating Modes—PowerPath States
Current Limited Input Power (IN1/IN2 to OUT)
Input Powered Charger (IN1/IN2 to BAT)
Output Powered Charger (OUT to BAT)
Ideal Diode (BAT to OUT)
Table 2. Operating Modes—Pin Currents vs Programmed Currents (Charging from IN1/IN2)
*Charge current shuts off when V
12
WALL PRESENT
WALL PRESENT
WALL PRESENT
WALL PRESENT
PROGRAMMING
Y
X
X
X
X
X
N
Y
X
X
X
X
X
N
N
X
X
X
X
Y
X
X
X
X
I
I
I
CL
CHG
CL
= I
< I
< I
CHG
CHG
CL
U
SHUTDOWN
SHUTDOWN
SHUTDOWN
SHUTDOWN
N
N
N
N
X
Y
X
X
X
X
X
Y
X
X
X
X
X
Y
X
X
X
Y
X
X
OUT
drops below V
SUSPEND
SUSPEND
SUSPEND
SUSPEND
X
X
Y
X
X
X
N
X
X
X
X
X
X
X
X
Y
X
X
X
N
X
X
X
X
OUTPUT CURRENT
I
I
OUT
OUT
I
OUT
I
BAT
I
I
I
I
I
OUT
OUT
OUT
< (I
> (I
OUT
OUT
OUT
= I
V
V
V
, i.e., when I
OUT
V
CL
CL
CL
> I
BAT
IN
< I
> I
= I
> I
< I
IN
> 4.35V
= I
– I
– I
CL
CL
CL
CL
CL
CL
> 3.8V
> 4.35V V
N
N
N
N
X
X
X
X
X
Y
X
X
X
X
X
Y
X
X
X
X
Y
> 2.8V
X
X
Y
*
CHG
CHG
CHG
)
)
OUT
V
V
exceeds I
IN
IN
OUT
> (V
> (V
V
> (V
BAT
OUT
OUT
IN
X
X
X
X
N
X
Y
X
X
X
X
N
X
Y
X
X
X
N
X
Y
> V
X
X
N
Y
CL
+ 100mV)
+ 100mV)
+ 100mV)
.
OUT
BATTERY CURRENT
I
BAT
I
I
I
I
I
BAT
BAT
BAT
BAT
BAT
I
BAT
= I
I
I
= I
= I
= I
= I
= I
BAT
BAT
CHG
CL
= I
CL
CL
CL
CL
V
= 0
= 0
V
V
OUT
– I
CHG
– I
– I
– I
– I
IN
IN
– I
OUT
OUT
OUT
OUT
OUT
> (V
> (V
OUT
> (V
BAT
BAT
BAT
V
N
N
N
X
X
X
X
X
Y
X
X
X
X
X
Y
X
X
X
X
Y
X
X
X
X
IN
+ 100mV)
+ 100mV)
+ 100mV)
OUTPUT CHARGER ENABLED
INPUT CHARGER ENABLED
CURRENT LIMIT ENABLED
I
IN
INPUT CURRENT
= I
I
I
I
I
I
I
I
I
DIODE ENABLED
IN
IN
IN
IN
IN
IN
IN
IN
Q
= I
= I
= I
= I
= I
= I
= I
= I
+ I
Q
Q
Q
Q
Q
Q
Q
Q
CHG
+ I
+ I
+ I
+ I
+ I
+ I
+ I
+ I
N
N
N
N
N
N
Y
N
N
N
N
N
N
Y
N
N
N
N
N
Y
N
N
N
Y
CL
CL
CL
CL
CL
CL
CL
CL
+ I
OUT
4055p