LTC3214EDD 데이터 시트보기 (PDF) - Linear Technology

부품명

상세내역

일치하는 목록

LTC3214EDD

500mA Camera LED Charge Pump

Linear Technology 

LTC3214

500mA Camera

LED Charge Pump

FEATURES

n Low Noise Constant Frequency Operation

n High Efficiency: Up to 94%

n Multi-Mode Operation: 1x, 1.5x or 2x Boost Modes

n Automatic Mode Switching

n High Output Current: Up to 500mA

n Tiny Application Circuit (3mm × 3mm DFN Package,

All Components <1mm High)

n Automatic Soft-Start

n Output Disconnect

n Open, Shorted LED Protection

n No Inductors

n Internal 110mΩ LED Current Sense Resistor

n 3mm × 3mm 10-Lead DFN Package

APPLICATIONS

n LED Torch/Camera Light Supply for Cell Phones,

PDAs and Digital Cameras

n General Lighting and/or Flash/Strobe Applications

DESCRIPTION

The LTC®3214 is a low noise, high current charge pump

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 resistor and

two bypass capacitors at VIN and CPO) make 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 resistor.

LED current is regulated using an internal 110mΩ sense

resistor. Automatic mode switching optimizes efficiency

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 × 3mm 10-lead

DFN package.

L, 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.

TYPICAL APPLICATION

C1

2.2μF

C2

2.2μF

2.9V TO 4.5V

CIN

2.2μF

DISABLE ENABLE

C1+ C1– C2+ C2–

VIN

CPO

LTC3214

ILED

EN

ISET

0.11Ω

RSET

3214 TA01a

LED: AOT2015

LED

CCPO

4.7μF

ILED

UP TO 500mA

Efficiency vs VIN

100

100mA 200mA

90

300mA

80

70

60

50mA

50

40

30

20

10 LED = AOT2015

VF = 2.9V TYP AT 100mA

0

2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5

VIN (V)

3214 TA01b

3214fb

1

Share Link: