LTC4076 查看數據表（PDF） - Linear Technology

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LTC4076

Dual Input Standalone Li-Ion Battery Charger

Linear Technology 

OPERATIOU

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 LTC4076 lacks sufficient

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

of sinking up to 10mA.

Thermal Limiting

An internal thermal feedback loop reduces the programmed

charge current if the die temperature attempts to rise above

LTC4076

a preset value of approximately 105°C. This feature protects

the LTC4076 from excessive temperature and allows the

user to push the limits of the power handling capability of

a given circuit board without risk of damaging the device.

The charge current can be set according to typical (not

worst-case) ambient temperature with the assurance that

the charger will automatically reduce the current in worst-

case conditions. DFN power considerations are discussed

further in the Applications Information section.

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

1/10th FULL CURRENT

CHRG STATE: PULLDOWN

BAT < 2.9V

BAT > 2.9V

2.9V < BAT

CHARGE

MODE

FULL CURRENT

CHRG STATE: PULLDOWN

IBAT < ITERMINATE

IN VOLTAGE MODE

BAT > 2.9V

CHARGE

MODE

FULL CURRENT⇒HPWR = HIGH

1/5 FULL CURRENT⇒HPWR = LOW

2.9V < BAT

CHRG STATE: PULLDOWN

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 20µA

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 18µA

CHRG STATE: Hi-Z

EN

DRIVEN LOW

4076 F01

Figure 1. LTC4076 State Diagram of a Charge Cycle

4076fa

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