LTC4067 データシートの表示（PDF） - Linear Technology

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LTC4067

USB Power Manager with OVP and Li-Ion/Polymer Charger

Linear Technology 

LTC4067

USB Power Manager

with OVP and

Li-Ion/Polymer Charger

FEATURES

Programmable Input Current Limit:

■ Single Resistor at CLPROG Pin to Set and Monitor

Input Current

Battery Charger/Ideal Diode/Controller:

■ 13V Overvoltage Protection

■ Full Featured Battery Charger with 4.2V Float

■ Up to 1.25A Programmable Charge Current

■ Thermal Regulation Maximizes Charge Current

Without Risk of Overheating

■ Internal 2 Hour Termination Timer from Onset of

Voltage Mode Charging

■ Automatic Load Switchover to Battery Power with

Internal Ideal Diode and Drive Output for Optional

External MOSFET

■ NTC Thermistor Input

■ Bad Battery Time-Out Detection

■ 4mm × 3mm 12-Lead DFN Package

U

APPLICATIO S

■ Automatic Battery Charging/Load Switchover

■ Backup Battery Charger

■ Uninterrupted Supplies

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

All other trademarks are the property of their respective owners.

DESCRIPTIO

The LTC®4067 is a USB power management and Li-Ion/

Polymer battery charger designed for portable battery

powered applications. The part controls total current used

by the USB peripheral for operation and battery charging.

The total input current may be left unregulated, or it may

be limited to 20% or 100% of the programmed value up

to 1.5A (typically 500mA). Battery charge current is au-

tomatically reduced such that the sum of the load current

and the charge current does not exceed the programmed

input current.

With the addition of an external P-channel MOSFET the

LTC4067 can withstand voltages up to 13V.

The LTC4067 includes a complete constant current/con-

stant voltage linear charger for single cell Li-Ion batteries.

The float voltage applied to the battery is held to a tight

0.4% tolerance, and charge current is programmed using

an external resistor to ground. An end-of-charge status

output, ⎯C⎯H⎯R⎯G, indicates full charge. Also featured is an

NTC thermistor input used to monitor battery temperature

while charging.

The LTC4067 is available in a 12-lead low profile 4mm ×

3mm DFN package.

TYPICAL APPLICATIO

WALL

OR

USB

OVI

OUT

10nF

OVP

ILOAD

10μF

IN

BAT

1μF

10μF

LTC4067

1-CELL

Li-Ion

ILIM0

CHRG

ILIM1

PROG

CLPROG GND

2k

4067 TA01

ILIM0 ILIM1 IIN(MAX)

L H O (SUSPEND)

L

L 200V/RCLPROG

2k

H

H 1000V/RCLPROG

H L FIXED (2A)

OVP Response to Ramp Input at OVI

VOVI

5V/DIV

5V TO 12V

IIN

500mA/DIV

VOUT

5V/DIV

VOVP

5V/DIV

VBAT = 4.2V

1ms/DIV

4067 TA01b

4067f

1

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