LTC3214

1

3214fa

TYPICAL APPLICATIO

APPLICATIO S

FEATURES

DESCRIPTIO

PDAs and Digital Cameras

■

General Lighting and/or Flash/Strobe Applications

■

Low Noise Constant Frequency Operation*

■

Automatic Mode Switching

× 3mm DFN Package,

All Components <1mm High)

■

Open, Shorted LED Protection

Ω LED Current Sense Resistor

■

3mm

× 3mm 10-Lead DFN Package

500mA Camera

LED Charge Pump

The LTC

DC/DC converter capable of driving high current LEDs at

up to 500mA from a 2.9V to 4.5V input. Low external

parts count (two flying capacitors, one programming

the LTC3214 ideally suited for small, battery-powered

applications.

Built-in soft-start circuitry prevents excessive inrush cur-

rent during start-up. High switching frequency enables the

use of small external capacitors.

Output current level is programmed by an external resis-

tor. LED current is regulated using an internal 110m

Ω

sense resistor. Automatic mode switching optimizes effi-

ciency by monitoring the voltage across the charge pump

and switching modes only when dropout is detected. The

part is available in a low profile 3mm x 3mm 10-lead DFN

package.

C1

2.2

µF

C2

2.2

µF

2.2

µF

4.7

µF

UP TO 500mA

LED

2.9V TO 4.5V

EN

DISABLE ENABLE

LTC3214

3214 TA01a

LED: AOT2015

CPO

0.11

Ω

, 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 6411531.

2.9

100

90

80

70

60

50

40

30

20

10

0

3.3

3.7

3.9

3214 TA01b

3.1

3.5

4.1

4.3

4.5

100mA

50mA

300mA

200mA

LED = AOT2015