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LTC4075EDD Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4075EDD
Description  Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4075EDD Datasheet(HTML) 1 Page - Linear Technology

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LTC4075/LTC4075X
1
4075Xf
The LTC®4075/LTC4075X are standalone linear chargers
that are capable of charging a single-cell Li-Ion 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 LTC4075
terminates the charge cycle when the charge current drops
below the programmed termination threshold after the
final float voltage is reached. With power applied to both
inputs, the LTC4075/LTC4075X 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.
Other features include automatic recharge, undervoltage
lockout, charge status outputs, and “power present”
status outputs to indicate the presence of wall adapter
or USB power.
Dual Input Battery Charger for Single-Cell Li-Ion
LTC4075
DCIN
USBIN
IUSB
IDC
BAT
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)
500mA (USB)
4075 TA01
GND
Dual Input USB/AC
Adapter Standalone Li-Ion
Battery Chargers
TIME (HR)
0
4.2
200
0
400
800
600
1000
1.5
2.5
4075 TA01b
3.6
3.4
5.0
4.0
3.8
2.5
0
–2.5
0.5
1.0
2.0
3.0
CONSTANT VOLTAGE
USBIN = 5V
TA = 25°C
RIDC = 1.25k
RIUSB = 2k
Complete Charge Cycle (1100mAh Battery)
, 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, 6700364
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
Charges 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
No External MOSFET, Sense Resistor or Blocking
Diode Needed
Thermal Regulation Maximizes Charging Rate
Without Risk of Overheating*
Preset Charge Voltage with ±0.6% Accuracy
Programmable Charge Current Termination
18µA USB Suspend Current in Shutdown
Independent “Power Present” Status Outputs
Charge Status Output
Automatic Recharge
Available Without Trickle Charge (LTC4075X)
Available in a Thermally Enhanced, Low Profile
(0.75mm) 10-Lead (3mm × 3mm) DFN Package
Cellular Telephones
Handheld Computers
Portable MP3 Players
Digital Cameras


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