LTC4077EDD 查看數據表（PDF） - Linear Technology

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LTC4077EDD

Dual Input Standalone Li-Ion Battery Charger

Linear Technology 

U

OPERATIO

Status Indicators

The charge status output (C⎯ H⎯ R⎯ G⎯ ) has two states: pull-down

and high impedance. The pull-down state indicates that

the LTC4077 is in a charge cycle. Once the charge cycle

has terminated or the LTC4077 is disabled, the pin state

becomes high impedance. The pull-down state is capable

of sinking up to 10mA.

LTC4077

The power supply status output (⎯P⎯W⎯R) has two states:

pull-down and high impedance. The pull-down state

indicates that power is present at either DCIN or USBIN.

If no power is applied at either pin, the ⎯P⎯W⎯R pin is high

impedance, indicating that the LTC4077 lacks sufficient

power to charge the battery. The pull-down state is capable

of sinking up to 10mA.

STARTUP

BAT < 2.9V

DCIN POWER APPLIED

ONLY USB POWER APPLIED

POWER SELECTION

TRICKLE CHARGE

MODE

1/10th FULL CURRENT

CHRG STATE: PULLDOWN

DCIN POWER

REMOVED

USBIN POWER

REMOVED OR

DCIN POWER

APPLIED

TRICKLE CHARGE

MODE

1/2 OR 1/10th FULL CURRENT

CHRG STATE: PULLDOWN

BAT < 2.9V

BAT > 2.9V

BAT > 2.9V

2.9V < BAT

CHARGE

MODE

FULL CURRENT

CHRG STATE: PULLDOWN

IBAT < ITERMINATE

IN VOLTAGE MODE

CHARGE

MODE

FULL CURRENT

CHRG STATE: PULLDOWN

2.9V < BAT

IBAT < ITERMINATE

IN VOLTAGE MODE

BAT < 4.1V

STANDBY

MODE

NO CHARGE CURRENT

CHRG STATE: Hi-Z

STANDBY

MODE

NO CHARGE CURRENT

CHRG STATE: Hi-Z

BAT < 4.1V

EN

DRIVEN LOW

SHUTDOWN

MODE

IDCIN DROPS TO 20mA

CHRG STATE: Hi-Z

EN

DRIVEN HIGH

DCIN POWER

REMOVED

EN

DRIVEN HIGH

USBIN POWER

REMOVED OR

DCIN POWER

APPLIED

SHUTDOWN

MODE

IUSBIN DROPS TO 18mA

CHRG STATE: Hi-Z

EN

DRIVEN LOW

4075 F01

Figure 1. LTC4077 State Diagram of a Charge Cycle

4077f

11

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