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LTC4078 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4078
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

LTC4078 Datasheet(HTML) 1 Page - Linear Technology

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LTC4078/LTC4078X
1
4078xfb
FEATURES
APPLICATIONS
DESCRIPTION
Dual Input Li-Ion Battery
Charger with Overvoltage Protection
The LTC®4078/LTC4078X are standalone linear chargers
that are capable of charging a single-cell Li-Ion/Polymer
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. The
LTC4078/LTC4078X feature 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 con-
ditions. The float voltage is fixed at 4.2V and the charge
current is programmed with an external resistor. The
LTC4078/LTC4078X terminate 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.
n 22V Maximum Voltage for Wall Adapter and
USB Inputs
n Charge Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
n Automatic Input Power Detection and Selection
n Charge Current Programmable Up to 950mA from
Wall Adapter Input
n Overvoltage Lockout for Wall Adapter and USB Inputs
n Battery Detection Input Disables Charger When No
Battery is Present
n No External MOSFET, Sense Resistor or Blocking
Diode Needed
n Thermal Regulation Maximizes Charge Rate Without
Risk of Overheating*
n Preset Charge Voltage with ±0.6% Accuracy
n Programmable Charge Current Termination
n 40μA USB Suspend Current in Shutdown
n Charge Status Output
n Automatic Recharge
n Available Without Trickle Charge (LTC4078X)
n Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm
× 3mm) DFN Package
n Cellular Telephones
n Handheld Computers
n Portable MP3 Players
n Digital Cameras
High Voltage Dual Input Battery Charger
for Li-Ion Battery Pack
Charger Current vs Supply Voltage
L, 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.
TYPICAL APPLICATION
LTC4078
DCIN
USBIN
IUSB
IDC
BAT
ITERM
BATDET
1.24k
1%
3.9k
2k
1%
2k
1%
WALL
ADAPTER
USB
PORT
1μF
1μF
+
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


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