LTC4076EDD#TR Linear Technology, LTC4076EDD#TR Datasheet - Page 7

• Manufacturer Part Number: LTC4076EDD#TR
• Description: IC CHARG BATT LI-ON USB 10DFN
• Manufacturer: Linear Technology

Specifications of LTC4076EDD#TR

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.3 V ~ 8 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-WFDFN Exposed Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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, R
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:
ITERM (Pin 3): Termination Current Threshold Program.
The termination current threshold, I
connecting a resistor, R
by the following formula:
When the battery current, I
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.
U
I
I
I
BAT
BAT
TERMINATE
=
=
R
R
V
V
U
IUSB
IUSB
IUSB
I I USB
=
•
•
R
100
1000
200
ITERM
U
V
ITERM
(
HPWR LOW
(
HPWR HIGH
BAT
, to ground. I
, falls below the termination
=
=
TERMINATE
)
)
TERMINATE
, is set by
is set
IUSB
,
 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, R
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:
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.
I
BAT
IDC
=
, to ground. When charging in constant-current
R
V
IDC
IDC
•1000
LTC4076
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