Datasheet > LTC3217

LTC3217

更新时间： 2024-09-26 14:57:55

品牌	Logo	应用领域
亚德诺 - ADI		泵
页数	文件大小	规格书
12页	174K
描述
600mA 低噪声多 LED 相机照明灯充电泵

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中文翻译

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数据手册

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LTC3217 数据手册

LTC3217

600mA Low Noise

Multi-LED Camera Light

Charge Pumps

FEATURES

DESCRIPTION

TheLTC^®3217isalownoisechargepumpDC/DCconverter

designed to power four high current LEDs. The LTC3217

requires only four small ceramic capacitors and two cur-

rent set resistors to form a complete LED power supply

and current controller.

Charge Pump Provides High Efﬁciency with

Automatic Mode Switching

Multimode Operation: 1x, 1.5x, 2x

Four Low Dropout LED Outputs

Up to 600mA Total Output Current

Independent Torch and Flash I and Enable Pins

Low Noise Constant Frequency Operation*

PWM Brightness Control via the EN2 Pin

Low Shutdown Current: 4μA

Internal Soft-Start Limits Inrush Current During

Start-Up and Mode Switching

SET

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

rent during start-up and mode changes. High switching

frequency enables the use of small external capacitors.

Independenthighandlowcurrentsettingsareprogrammed

by two external resistors. Shutdown mode and current

output levels are selected via two logic inputs.

Open/Short LED Protection

No Inductors

(3mm x 3mm) 16-Lead QFN Plastic Package

The current through the LEDs is programmed via I

SET1

and I

. In addition, the brightness can be controlled

SET2

by pulse width modulation of the EN2 pin.

The charge pump optimizes efﬁciency based on the volt-

age across the LED current sources. The part powers up

in 1x mode and will automatically switch to boost mode

whenever any enabled LED current source begins to enter

dropout. The ﬁrst dropout switches the part into 1.5x

mode and a subsequent dropout switches the part into

2x mode. The LTC3217 resets to 1x mode whenever the

part is shut down.

APPLICATIONS

Multi-LED Camera Light Supply for Cellphones/

DSCs/PDAs

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.

The LTC3217 is available in a low profile 16-lead

(3mm × 3mm × 0.75mm) QFN package.

TYPICAL APPLICATION

2.2μF

Efﬁciency vs V_BAT

100

100mA

200mA

C1P C1M C2P C2M

400mA

CPO

BAT

2.2μF

LTC3217

AOT-2015HPW-1751B

LED1

LED2

LED3

EN1 (TORCH)

EN2 (FLASH)

EN1

EN2

LED4

GND

TOTAL OUTPUT CURRENT

LED

LED = 2015 HPW AOT

SET1

SET2

EN1

EN2

/PIN

LED

0 (SHUTDOWN)

25mA/LED

75mA/LED

100mA/LED

19.6k

6.49k

3.4 3.6 3.8

(V)

4.2 4.4

3.2

BAT

3217 TA01b

3217 TA01

3217fa

12 3 4 5 6 7...12

中文翻译

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与LTC3217相关器件

型号	品牌	获取价格	描述	数据表
LTC3217EUD	Linear	获取价格	600mA Low Noise Multi-LED Camera Light Charge Pump
LTC3218	Linear	获取价格	400mA Single Wire Camera LED Charge Pump
LTC3218	ADI	获取价格	400mA 单线式相机 LED 充电泵
LTC3218EDDB#PBF	Linear	获取价格	暂无描述
LTC3218EDDB#TRMPBF	Linear	获取价格	LTC3218 - 400mA Single Wire Camera LED Charge Pump; Package: DFN; Pins: 10; Temperature Ra
LTC3218EDDB#TRPBF	Linear	获取价格	LTC3218 - 400mA Single Wire Camera LED Charge Pump; Package: DFN; Pins: 10; Temperature Ra
LTC3218EDDBPBF	Linear	获取价格	400mA Single Wire Camera LED Charge Pump
LTC3218EDDBTRPBF	Linear	获取价格	400mA Single Wire Camera LED Charge Pump
LTC3219	Linear	获取价格	250mA Universal Nine Channel LED Driver
LTC3219	ADI	获取价格	250mA 通用型 9 通道 LED 驱动器

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