ltc4097 Linear Technology Corporation, ltc4097 Datasheet - Page 9

• Manufacturer Part Number: ltc4097
• Description: Usb/wall Adapter Standalone Li-ion/polymer Battery Charger
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
IUSB (Pin 9): 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 USBIN
input using the following formula:
IDC (Pin 10): Charge Current Program for Wall Adapter
Power. The charge current is set by connecting a resistor,
R
this pin servos to 1V. The voltage on this pin can be used
IDC
I
BAT
, to ground. When charging in constant current mode,
=
R
V
IUSB
IUSB
• 1000
IUSB
,
to measure the battery current delivered from the DCIN
input using the following formula:
GND (Pin 11): Ground.
BAT (Pin 12): Charger Output. This pin provides charge
current to the battery and regulates the fi nal fl oat voltage
to 4.2V.
Exposed Pad (Pin 13): Ground. The exposed backside
of the package is ground and must be soldered to the
PC board ground for electrical connection and maximum
heat transfer.
I
BAT
=
R
V
IDC
IDC
•1000
LTC4097
9
4097f