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LTC4076 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4076
Description  Dual Input Standalone Li-Ion Battery Charger
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4076 Datasheet(HTML) 7 Page - Linear Technology

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LTC4076
7
4076fa
USBIN (Pin 1): USB Input Supply Pin. Provides power to
thebatterycharger.Themaximumsupplycurrentis650mA.
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:
I
V
R
HPWR HIGH
I
V
R
BAT
IUSB
IUSB
BAT
IUSB
=
=
=
(
)
1000
IIUSB
HPWR LOW
(
)
200
=
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:
I
V
R
TERMINATE
ITERM
=
100
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:
I
V
R
BAT
IDC
IDC
=
•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
packageisgroundandmustbesolderedtoPCboardground
for electrical connection and maximum heat transfer.
PI FU CTIO S


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