LTC4075XEDD Linear Technology Corporation, LTC4075XEDD Datasheet

LTC4075XEDD

Manufacturer Part Number

LTC4075XEDD

Description

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC4075XEDD.pdf (16 pages)

Specifications of LTC4075XEDD

Case

DFN8

Date_code

0530+

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APPLICATIO S

FEATURES

■

TYPICAL APPLICATIO

ADAPTER

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 Proﬁ le

(0.75mm) 10-Lead (3mm × 3mm) DFN Package

Cellular Telephones

Handheld Computers

Portable MP3 Players

Digital Cameras

WALL

PORT

USB

1µF

Dual Input Battery Charger for Single-Cell Li-Ion

1µF

1.24k

DCIN

USBIN

IUSB

IDC

LTC4075

GND

ITERM

BAT

800mA (WALL)

500mA (USB)

4.2V

SINGLE CELL

Li-Ion BATTERY

4075 TA01

DESCRIPTIO

Adapter Standalone Li-Ion

The LTC

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 ﬂ oat voltage is ﬁ xed 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

ﬁ nal ﬂ oat 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.

All other trademarks are the property of their respective owners.

*Protected by U.S. patents, including 6522118, 6700364

, LTC and LT are registered trademarks of Linear Technology Corporation.

4075/LTC4075X are standalone linear chargers

Complete Charge Cycle (1100mAh Battery)

1000

–2.5

800

600

400

200

4.0

3.8

3.6

3.4

5.0

4.2

2.5

Dual Input USB/AC

LTC4075/LTC4075X

0.5

Battery Chargers

1.0

CONSTANT VOLTAGE

TIME (HR)

1.5

USBIN = 5V

2.0

IDC

IUSB

= 25°C

= 1.25k

= 2k

2.5

4075 TA01b

3.0

4075Xfa

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