LTC3214 datasheet(1/12 Pages) LINER

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LTC3214

1

3214fb

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

500mA Camera

LED Charge Pump

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.

Efﬁciency vs VIN

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

n LED Torch/Camera Light Supply for Cell Phones,

PDAs and Digital Cameras

n General Lighting and/or Flash/Strobe Applications

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.

C1

2.2μF

C2

2.2μF

CIN

2.2μF

CCPO

4.7μF

ILED

UP TO 500mA

LED

ILED

VIN

2.9V TO 4.5V

EN

DISABLE ENABLE

LTC3214

C1+

C1– C2+

C2–

ISET

3214 TA01a

LED: AOT2015

CPO

RSET

0.11Ω

VIN (V)

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

VF = 2.9V TYP AT 100mA

Số phần tương tự - LTC3214

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Linear Technology	LTC3214	184Kb / 12P	500mA Camera LED Charge Pump
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