LTC4055EUF-TRPBF View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC4055EUF-TRPBF

USB Power Controller and Li-Ion Charger

Linear Technology 

LTC4055/LTC4055-1

OPERATION

Table 1. Operating Modes—PowerPath States Current Limited Input Power (IN1/IN2 to OUT)

WALL PRESENT SHUTDOWN SUSPEND VIN > 3.8V

Y

X

X

X

VIN > (VOUT + 100mV)

X

VIN > (VBAT + 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 VIN > 4.35V

Y

X

X

X

VIN > (VOUT + 100mV)

X

VIN > (VBAT + 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 VIN > 4.35V

N

X

X

X

VOUT > (VIN + 100mV)

X

VOUT > (VBAT + 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 VBAT > 2.8V

VBAT > VOUT

VIN

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

ICL = ICHG

IOUT < ICL

IOUT = ICL = ICHG

IOUT > ICL

ICHG < ICL

IOUT < (ICL – ICHG)

IOUT > (ICL – ICHG)

IOUT = ICL

IOUT > ICL

ICL < ICHG

IOUT < ICL

IOUT > ICL*

*Charge current shuts off when VOUT drops below VBAT, i.e., when IOUT exceeds ICL.

IBAT = ICHG – IOUT

IBAT = 0

IBAT = ICL – IOUT

IBAT = ICHG

IBAT = ICL – IOUT

IBAT = 0

IBAT = ICL – IOUT

IBAT = ICL – IOUT

IBAT = ICL – IOUT

12

INPUT CURRENT

IIN = IQ + ICL

IIN = IQ + ICL

IIN = IQ + ICL

IIN = IQ + ICHG + IOUT

IIN = IQ + ICL

IIN = IQ + ICL

IIN = IQ + ICL

IIN = IQ + ICL

IIN = IQ + ICL

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