LTC4076EDD 查看數據表（PDF） - Linear Technology

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LTC4076EDD

Dual Input Standalone Li-Ion Battery Charger

Linear Technology 

LTC4076

PI FU CTIO S

USBIN (Pin 1): USB Input Supply Pin. Provides power to

the battery charger. The maximum supply current is 650mA.

This pin should be bypassed with a 1µF capacitor.

IUSB (Pin 2): Charge Current Program for USB Power.

The charge current is set by connecting a resistor, RIUSB,

to ground. When charging in constant-current mode, this

pin servos to 1V. The voltage on this pin can be used to

measure the battery current delivered from the USB input

using the following formula:

IBAT

=

VIUSB

RIUSB

• 1000

(HPWR

=

HIGH)

IBAT

=

VIUSB

RIUSB

• 200

(HPWR

= LOW)

ITERM (Pin 3): Termination Current Threshold Program.

The termination current threshold, ITERMINATE, is set by

connecting a resistor, RITERM, to ground. ITERMINATE is set

by the following formula:

ITERMINATE

=

100V

RITERM

When the battery current, IBAT, falls below the termination

threshold, charging stops and the CHRG output becomes

high impedance.

This pin is internally clamped to approximately 1.5V. Driv-

ing this pin to voltages beyond the clamp voltage should

be avoided.

PWR (Pin 4): Open-Drain Power Supply Status Output.

When the DCIN or USBIN pin voltage is sufficient to begin

charging (i.e. when the supply is greater than the under-

voltage lockout threshold and at least 180mV above the

battery terminal), the PWR pin is pulled low by an internal

N-channel MOSFET. Otherwise PWR is high impedance.

This output is capable of sinking up to 10mA, making it

suitable for driving an LED.

CHRG (Pin 5): Open-Drain Charge Status Output. When

the LTC4076 is charging, the CHRG pin is pulled low by

an internal N-channel MOSFET. When the charge cycle is

completed, CHRG becomes high impedance. This output

is capable of sinking up to 10mA, making it suitable for

driving an LED.

EN (Pin 6): Charge Enable Input. A logic low on this pin

enables the charger. If left floating, an internal 2MΩ pull-

down resistor defaults the LTC4076 to charge mode . Pull

this pin high for shutdown.

HPWR (Pin 7): HPWR Enable Input. Used to control the

amount of current drawn from the USB port. A logic high

on the HPWR pin sets the charge current to 100% of the

current programmed by the IUSB pin. A logic low on the

HPWR pin sets the charge current to 20% of the current

programmed by the IUSB pin. An internal 2MΩ pull-down

resistor defaults the HPWR pin to its low current state.

IDC (Pin 8): Charge Current Program for Wall Adapter

Power. The charge current is set by connecting a resis-

tor, RIDC, to ground. When charging in constant-current

mode, this pin servos to 1V. The voltage on this pin can

be used to measure the battery current delivered from the

DC input using the following formula:

IBAT

=

VIDC

RIDC

• 1000

BAT (Pin 9): Charger Output. This pin provides charge

current to the battery and regulates the final float voltage

to 4.2V.

DCIN (Pin 10): Wall Adapter Input Supply Pin. Provides

power to the battery charger. The maximum supply

current is 950mA. This should be bypassed with a 1μF

capacitor.

Exposed Pad (Pin 11): GND. The exposed backside of the

package is ground and must be soldered to PC board ground

for electrical connection and maximum heat transfer.

4076fa

7

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