LTC4096X Просмотр технического описания (PDF) - Linear Technology

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LTC4096X

Dual Input Standalone Li-Ion Battery Chargers

Linear Technology 

LTC4096/LTC4096X

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.

Shutdown Supply Current vs

Temperature and VUSBIN

60 SUSP = VUSBIN

VDCIN = 0V

50

40

30

VUSBIN = 5.5V

20

VUSBIN = 4.25V

10

0

–50 –25 0 25 50 75 100

TEMPERATURE (°C)

4096 G28

Undervoltage Lockout Voltage

(Falling) vs Temperature

4.10

4.05

DCIN UVLO

4.00

3.95

3.90

3.85

USBIN UVLO

3.80

3.75

3.70

–50

–25 0 25 50

TEMPERATURE (°C)

75 100

4096 G29

PIN FUNCTIONS

DCIN (Pin 1): Wall Adapter Input Supply Pin. Provides

power to the battery charger. The maximum supply

current is 1.2A. This pin should be bypassed with a 1µF

capacitor.

USBIN (Pin 2): USB Input Supply Pin. Provides power to

the battery charger. The maximum supply current is 1A.

This pin should be bypassed with a 1µF capacitor.

PWR (Pin 3): Power Present Output. When the DCIN or

USBIN pin voltage is sufficient to begin charging (i.e. when

the DCIN or USBIN supply is greater than the undervoltage

lockout thresholds and at least 100mV or 150mV, re-

spectively, above the battery terminal), the PWR pin is

connected to the appropriate input through an internal

P-channel MOSFET. If sufficient voltage to charge is not

present on DCIN or USBIN the PWR pin is high impedance.

This output is able to source up to 120mA.

⎯C⎯H⎯R⎯G (Pin 4): Open-Drain Charge Status Output. When

the LTC4096 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.

SUSP (Pin 5): Charge Enable Input. A logic low on this

pin enables the charger. If left floating, an internal 3.4MΩ

pull-down resistor defaults the LTC4096 to charge mode.

Pull this pin high for shutdown.

ITERM (Pin 6): Charge 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.

IUSB (Pin 7): 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 USBIN

input using the following formula:

IBAT

=

VIUSB

RIUSB

• 1000

4096xf

7

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