Datasheet > LTC3230

LTC3230

更新时间： 2024-11-06 14:58:19

品牌	Logo	应用领域
亚德诺 - ADI		驱动驱动器
页数	文件大小	规格书
16页	225K
描述
具有双 LDO 的 5-LED 主/副显示屏驱动器

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中文翻译

获取价格

数据手册

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LTC3230 数据手册

LTC3230

5-LED Main/Sub Display

Driver with Dual LDO

FEATURES

DESCRIPTION

TheLTC^®3230isalownoisechargepumpDC/DCconverter

designed to drive 4 Main LEDs and 1 Sub LED, plus two

200mA linear regulators to provide additional system

power.TheLTC3230chargepumprequiresonlyfoursmall

ceramic capacitors and one current set resistor to form a

complete LED power supply and current controller.

■

Low Noise Charge Pump Provides High Efﬁciency

with Automatic Mode Switching

■

Multimode Operation: 1x, 1.5x, 2x

■

Full-Scale Current Set Resistor

Up to 125mA Total LED Current

■

Single Wire Enable/Brightness Control for Main and

Sub Display LEDs

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.

Main and Sub full-scale current settings are programmed

by a single external resistor.

■

32:1 Linear LED Brightness Control

■

Dual 200mA Linear Regulators

■

Four 25mA Low Dropout Main LED Current Sources

■

One 25mA Low Dropout Sub LED Current Source

■

Low Noise Constant Frequency Operation

■

Charge pump efﬁciency is optimized based on the voltage

across the LED current sources. The part powers up in 1x

modeandautomaticallyswitchestothenexthighermode,

1.5x and subsequently 2x, whenever any LED current

source approaches dropout.

Low Shutdown Current: 3μA

■

Internal Soft-Start Limits Inrush Current During

Start-Up and Mode Switching

■

Open/Short LED Protection

■

No Inductors

■

20-Lead 3mm × 3mm QFN Package

Two 200mA linear regulators have independent enable

and output voltage select pins. Each regulator can be set

to one of three pre-selected output voltages with tri-level

input pins. The regulators may be enabled independently

of the charge pump.

APPLICATIONS

■

Multi-LED Driver and Dual LDO Supplies for Cell

Phone, PDA, Digital Camera and PND Applications

, 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 LTC3230 is available in a low proﬁle (0.75mm) 3mm

× 3mm 20-lead QFN package.

TYPICAL APPLICATION

1 F

Efﬁciency vs V_INVoltage

100

125mA

C1P C1M C2P C2M

CPO

MAIN

SUB

= 2.7V

TO 5.5V

2.2 F

1 F

LTC3230

ENM

ENS

ENM

ENS

MLED1

MLED2

MLED3

MLED4

SLED

ENLDO1

ENLDO2

3230 TA01a

LDO1

1.5V

1 F

200mA

4 LEDs AT 9mA/LED

= 3V

= 25°C

2.8V

200mA

LDO2

SET

GND

SET

1 F

17.4k

3.4 3.6 3.8

(V)

4.2 4.4

3.2

ENM OR ENS

3230 TA01b

SET BRIGHTNESS LEVEL ON

OFF

3230fa

12 3 4 5 6 7...16

中文翻译

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与LTC3230相关器件

型号	品牌	获取价格	描述	数据表
LTC3230EUD#PBF	Linear	获取价格	LTC3230 - 5-LED Main/Sub Display Driver with Dual LDO; Package: QFN; Pins: 20; Temperature
LTC3230EUD#TRPBF	Linear	获取价格	LTC3230 - 5-LED Main/Sub Display Driver with Dual LDO; Package: QFN; Pins: 20; Temperature
LTC3230EUD-PBF	Linear	获取价格	5-LED Main/Sub Display Driver with Dual LDO
LTC3230EUD-TRPBF	Linear	获取价格	5-LED Main/Sub Display Driver with Dual LDO
LTC3240	Linear	获取价格	3.3V/2.5V Step-Up/ Step-Down Charge Pump DC/DC Converter
LTC3240	ADI	获取价格	3.3V/2.5V 升压/降压型充电泵 DC/DC 转换器
LTC3240-2.5	Linear	获取价格	Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump
LTC3240-2.5_15	Linear	获取价格	3.3V/2.5V Step-Up/ Step-Down Charge Pump DC/DC Converter
LTC3240-3.3	Linear	获取价格	Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump
LTC3240-3.3_15	Linear	获取价格	3.3V/2.5V Step-Up/ Step-Down Charge Pump DC/DC Converter

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