LTC4055-1_15 Datasheet, PDF (12/24 Pages) Linear Technology – USB Power Controller and Li-Ion Charger

LTC4055/LTC4055-1
OPERATION
Table 1. Operating Modes—PowerPath States Current Limited Input Power (IN1/IN2 to OUT)
WALL PRESENT SHUTDOWN SUSPEND V_IN > 3.8V
Y
X
X
X
V_IN > (V_OUT + 100mV)
X
V_IN > (V_BAT + 100mV)
X
X
Y
X
X
X
X
X
X
Y
X
X
X
X
X
X
N
X
X
X
X
X
X
N
X
X
X
X
X
X
N
N
N
N
Y
Y
Y
Input Powered Charger (IN1/IN2 to BAT)
WALL PRESENT SHUTDOWN SUSPEND V_IN > 4.35V
Y
X
X
X
V_IN > (V_OUT + 100mV)
X
V_IN > (V_BAT + 100mV)
X
X
Y
X
X
X
X
X
X
Y
X
X
X
X
X
X
N
X
X
X
X
X
X
N
X
X
X
X
X
X
N
N
N
N
Y
Y
Y
Output Powered Charger (OUT to BAT)
WALL PRESENT SHUTDOWN SUSPEND V_IN > 4.35V
N
X
X
X
V_OUT > (V_IN + 100mV)
X
V_OUT > (V_BAT + 100mV)
X
X
Y
X
X
X
X
X
X
X
N
X
X
X
X
X
X
N
X
X
X
X
X
X
N
Y
N
X
Y
Y
Y
Ideal Diode (BAT to OUT)
WALL PRESENT SHUTDOWN SUSPEND V_BAT > 2.8V
V_BAT > V_OUT
V_IN
X
Y
X
X
X
X
X
X
X
N
X
X
X
X
X
X
N
X
X
N
X
Y
Y
X
CURRENT LIMIT ENABLED
N
N
N
N
N
N
Y
INPUT CHARGER ENABLED
N
N
N
N
N
N
Y
OUTPUT CHARGER ENABLED
N
N
N
N
N
Y
DIODE ENABLED
N
N
N
Y
Table 2. Operating Modes—Pin Currents vs Programmed Currents (Charging from IN1/IN2)
PROGRAMMING
OUTPUT CURRENT
BATTERY CURRENT
I_CL = I_CHG
I_OUT < I_CL
I_OUT = I_CL = I_CHG
I_OUT > 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_CL < I_CHG
I_OUT < I_CL
I_OUT > I_CL*
*Charge current shuts off when V_OUT drops below V_BAT, i.e., when I_OUT exceeds I_CL.
I_BAT = I_CHG – I_OUT
I_BAT = 0
I_BAT = I_CL – I_OUT
I_BAT = I_CHG
I_BAT = I_CL – I_OUT
I_BAT = 0
I_BAT = I_CL – I_OUT
I_BAT = I_CL – I_OUT
I_BAT = I_CL – I_OUT
12
INPUT CURRENT
I_IN = I_Q + I_CL
I_IN = I_Q + I_CL
I_IN = I_Q + I_CL
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_IN = I_Q + I_CL
I_IN = I_Q + I_CL
4055fb