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LTC4097 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4097
Description  USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4097 Datasheet(HTML) 1 Page - Linear Technology

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LTC4097
1
4097f
LTC4097
DCIN
USBIN
IUSB
IDC
BAT
VNTC
HPWR
NTC
ITERM
1.24k
1%
2k
1%
2k
1%
WALL
ADAPTER
USB
PORT
1
µF
1
µF
+
4.2V
SINGLE CELL
Li-Ion BATTERY
800mA (WALL)
100mA/500mA (USB)
4097 TA01
GND
T
TIME (HR)
0
4.2
200
0
400
800
600
1000
1.5
2.5
4097 TA01b
3.6
3.4
5.0
4.0
3.8
2.5
0
0.5
1.0
2.0
3.0
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.24k
RIUSB = 2k
HPWR = 5V
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
USB/Wall Adapter
Standalone Li-Ion/Polymer
Battery Charger
The LTC®4097 is a standalone linear battery charger that
is capable of charging a single-cell Li-Ion or Li-Polymer
battery from both wall adapter and USB inputs. The charger
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 LTC4097
terminates the charge cycle when the charge current drops
below the user programmed termination threshold after
the final float voltage is reached. The LTC4097 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, automatic recharge,
undervoltage lockout, charge status output, an NTC therm-
istor input used to monitor battery temperature and VNTC
power present output with 120mA drive capability.
Dual Input Battery Charger for Single-Cell Li-Ion Battery
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents including 6522118.
Charges Single-Cell Li-Ion/Polymer Battery from
Wall Adapter and USB Inputs
Automatic Input Detection (Wall Adapter Input has
Charging Priority)
Charge Current Programmable up to 1.2A from
Wall Adapter Input
Programmable Charge Current Termination
NTC Thermistor Input for Temperature Qualified
Charging
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) 12-Lead (3mm × 2mm) DFN Package
Cellular Telephones
MP3 Players
Portable Handheld Devices
Complete Charge Cycle (1100mAh Battery)


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