ltc4078 Linear Technology Corporation, ltc4078 Datasheet
ltc4078
Manufacturer Part Number
ltc4078
Description
Dual Input Li-ion Battery Charger With Overvoltage Protection
Manufacturer
Linear Technology Corporation
Datasheet
1.LTC4078.pdf
(16 pages)
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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
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
Available Without Trickle Charge (LTC4078X)
Available in a Thermally Enhanced, Low Profi le
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
Cellular Telephones
Handheld Computers
Portable MP3 Players
Digital Cameras
ADAPTER
WALL
PORT
USB
1μF
High Voltage Dual Input Battery Charger
1μF
2k
1%
for Li-Ion Battery Pack
1.24k
1%
DCIN
USBIN
IUSB
IDC
LTC4078
GND
BATDET
ITERM
BAT
Charger with Overvoltage Protection
2k
1%
3.9k
800mA (WALL)
500mA (USB)
+
4.2V
Li-Ion
BATTERY
PACK
4078X TA01
DESCRIPTION
The LTC
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 fl oat voltage is fi xed 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 fi nal fl oat 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
profi le (0.75mm) 3mm × 3mm 10-lead DFN package.
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.
Dual Input Li-Ion Battery
®
4078/LTC4078X are standalone linear chargers
Charger Current vs Supply Voltage
900
800
700
600
500
400
300
200
100
0
2
LTC4078/LTC4078X
3
4
SUPPLY VOLTAGE (V)
5
6
CHARGE FROM DCIN
CHARGE
FROM USBIN
7
R
R
V
V
BAT
BATDET
IDC
IUSB
8
= 1.24k
= 3.5V
= 2k
4078x TA01b
19
= 0V
20
4078xfb
1
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