LTC4075HVX 查看數據表（PDF） - Linear Technology

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LTC4075HVX

High Voltage Dual Input Li-Ion/Polymer Battery Charger

Linear Technology 

FEATURES

■ 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

■ No External MOSFET, Sense Resistor or Blocking

Diode Needed

■ Thermal Regulation Maximizes Charge Rate Without

Risk of Overheating*

■ Preset Charge Voltage with ±0.35% Accuracy

■ Programmable Charge Current Termination

■ 40μA USB Suspend Current in Shutdown

■ Independent “Power Present” Status Outputs

■ Charge Status Output

■ Automatic Recharge

■ Available in a Thermally Enhanced, Low Profile

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

APPLICATIONS

■ Cellular Telephones

■ Handheld Computers

■ Portable MP3 Players

■ Digital Cameras

LTC4075HVX

High Voltage Dual Input

Li-Ion/Polymer Battery

Charger

DESCRIPTION

The LTC®4075HVX 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

LTC4075HVX 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 LTC4075HVX

terminates the charge cycle when the charge current drops

below the programmed termination threshold after the

final float voltage is reached.

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. No trickle charge allows full current from the charger

when a load is connected directly to the battery.

, 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

Dual Input Battery Charger for Single-Cell Li-Ion

WALL

ADAPTER

USB

PORT

1μF

LTC4075HVX

DCIN

BAT

USBIN

1μF

IUSB

2k

IDC

ITERM

1% 1.24k

GND

1%

800mA (WALL)

500mA (USB)

+ 4.2V

SINGLE CELL

Li-Ion BATTERY

2k

1%

4075hvx TA01

Charge Current vs Supply Voltage

900

RIDC = 1.24k

800

RIUSB = 2k

VBAT = 3.5V

700

CHARGE FROM DCIN

600

500

400

CHARGE

300

FROM USBIN

200

100

0

2 3 4 5 6 7 8 19 20

SUPPLY VOLTAGE (V)

4075hvx TA01b

4075hvxf

1

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