LTC3201

1

3201f

APPLICATIO S

TYPICAL APPLICATIO

FEATURES

DESCRIPTIO

The LTC

charge pump DC/DC converter specifically designed for

powering white LEDs. The part produces a low noise

boosted supply capable of supplying 100mA of output

current. LED current is regulated for accurate and stable

backlighting. A 3-bit DAC provides output current adjust

for brightness control.

Low external parts count (one small flying capacitor and

three small bypass capacitors) and small MSOP-10 pack-

age size make the LTC3201 ideally suited for space con-

strained applications. An input noise filter further reduces

input noise, thus enabling direct connection to the battery.

High switching frequency enables the use of small external

capacitors.

The LTC3201 contains overtemperature protection and

can survive an indefinite output short to GND. Internal

soft-start circuitry also prevents excessive inrush current

on start-up. A low current shutdown feature disconnects

than 1

µA.

s

White LED Backlighting

s

Programmable Boost Current Source

s

Input Noise Filter Minimizes Supply Noise

s

Constant Frequency Operation

s

3-Bit LED Current Control

s

No Inductors

s

s

Output Current: 100mA

s

s

1.8MHz Switching Frequency

s

Soft-Start Limits Inrush Current at Turn-On

s

Short-Circuit and Overtemperature Protected

s

Available in 10-Pin MSOP Package

100mA Ultralow Noise

Charge Pump LED Supply

with Output Current Adjust

Ultralow Noise White LED Driver

with Adjustable Current Control

Input Current Ripple

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

LTC3201

CM

CP

D0-D2

FILTER

GND

FB

1

µF

1

µF

0.22

µF

0.22

µF

56

Ω

56

Ω

56

Ω

UP TO

6-WHITE LEDs

Li ION

LED

CURRENT

ADJUST

3

3201 TA01a

+

• • •

3201 TA01b

50mA/DIV

100ns/DIV