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LTC4078XEDD-TRPBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4078XEDD-TRPBF
Description  Dual Input Li-Ion Battery Charger with Overvoltage Protection
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4078XEDD-TRPBF Datasheet(HTML) 1 Page - Linear Technology

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LTC4078X
1
4078xf
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Input Li-Ion Battery
Charger with Overvoltage Protection
The LTC®4078X is a standalone linear charger that is
capable of charging a single-cell Li-Ion/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.
The LTC4078X features a maximum 22V rating for both
wall adapter and USB inputs, although charging stops if
the selected power source exceeds the overvoltage limit.
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 LTC4078X
terminates the charge cycle when the charge current drops
below the programmed termination threshold after the
final float voltage is reached.
Other features include battery present detection, automatic
recharge, undervoltage lockout, charge status outputs, and
“power present” status outputs to indicate the presence of
wall adapter or USB power. The device is offered in a low
profile (0.75mm) 3mm × 3mm 10-lead DFN package.
22V Maximum Voltage for Wall Adapter and
USB Inputs
Charge Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
Automatic Input Power Detection and Selection
Charge Current Programmable Up to 950mA from
Wall Adapter Input
Overvoltage Lockout for Wall Adapter and USB Inputs
Battery Detection Input Disables Charger When No
Battery is Present
No External MOSFET, Sense Resistor or Blocking
Diode Needed
Thermal Regulation Maximizes Charge Rate Without
Risk of Overheating*
Preset Charge Voltage with ±0.6% Accuracy
Programmable Charge Current Termination
40µA USB Suspend Current in Shutdown
Charge Status Output
Automatic Recharge
No Trickle Charge
Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
Cellular Telephones
Handheld Computers
Portable MP3 Players
Digital Cameras
, 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, 6700364.
High Voltage Dual Input Battery Charger
for Li-Ion Battery Pack
LTC4078X
DCIN
USBIN
IUSB
IDC
BAT
ITERM
BATDET
1.24k
1%
3.9k
2k
1%
2k
1%
WALL
ADAPTER
USB
PORT
1
µF
1
µF
+
4.2V
Li-Ion
BATTERY
PACK
800mA (WALL)
500mA (USB)
4078X TA01
GND
SUPPLY VOLTAGE (V)
2
900
800
700
600
500
400
300
200
100
0
19
345678
20
4078x TA01b
RIDC = 1.24k
RIUSB = 2k
VBAT = 3.5V
VBATDET = 0V
CHARGE FROM DCIN
CHARGE
FROM USBIN
Charger Current vs Supply Voltage


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