LTC4096_15 Datasheet, PDF (1/16 Pages) Linear Technology – Dual Input Standalone Li-Ion Battery Chargers

LTC4096/LTC4096X
Dual Input Standalone
Li-Ion Battery Chargers
FEATURES
■ _{Charges Single-Cell Li-Ion Battery from Wall}
Adapter and USB Inputs
■ _{Automatic Input Detection (DC Input has Charging}
Priority)
■ _{Charge Current Programmable up to 1.2A from}
Wall Adapter Input
■ _{C/X Charge Current Termination}
■ _{Input Power Present Output (PWR) with 120mA}
Drive Capability
■ _{Independent DC, USB Charge Current Programming}
■ _{Preset Float Voltage with ±0.6% Accuracy}
■ _{Thermal Regulation Maximizes Charge Rate Without}
Risk of Overheating*
■ _{Charge Status Output}
■ _{Automatic Recharge}
■ _{20µA Charger Quiescent Current in Shutdown}
■ _{Available in a Thermally Enhanced, Low Profile}
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
APPLICATIONS
■ _{Cellular Telephones}
■ _{MP3 Players}
■ _{Portable Handheld Devices}
DESCRIPTION
The LTC^®4096/LTC4096X are standalone linear chargers
that are capable of charging a single-cell Li-Ion or Li-Poly-
mer battery from both wall adapter and USB inputs. The
chargers can detect power at the inputs and automatically
select the appropriate power source for charging.
No external sense resistor or blocking diode is required
for charging due to the internal MOSFET architecture.
Internal thermal feedback regulates the battery charge
current to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The float voltage is fixed at 4.2V and the charge current
is programmed with an external resistor. The LTC4096
terminates the charge cycle when the charge current drops
below the user programmed termination threshold after
the final float voltage is reached. The LTC4096 can be put
into shutdown mode reducing the DCIN supply current to
20µA, the USBIN supply current to 10µA, and the battery
drain current to less than 2µA even with power applied
to both inputs.
Other features include trickle charge (LTC4096 only), auto-
matic recharge, undervoltage lockout, charge status output
and power present output with 120mA drive capability.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents including 6522118.
TYPICAL APPLICATION
Dual Input Battery Charger for Single-Cell Li-Ion Battery
WALL
ADAPTER
USB
PORT
1mF
1mF _{ON OFF}
1.24k
2k
LTC4096
DCIN
BAT
USBIN PWR
SUSP
IDC
CHRG
IUSB ITERM
GND
800mA (WALL)
500mA (USB)
+ ^4.2V
1k
Li-Ion
BATTERY
2k
4096 TA01
Complete Charge Cycle (1100mAh Battery)
1000
800
600
400
200
0
4.2
4.0
3.8
3.6
3.4
5.0
2.5
0
CONSTANT VOLTAGE
USBIN = 5V
T_A = 25°C
R_IDC = 1.24k
R_IUSB = 2k
0 0.5 1.0 1.5 2.0 2.5 3.0
TIME (HR)
4096 TA01b
4096xf
1