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LTC3230

更新时间： 2023-12-20 18:46:19
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

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LTC3230 数据手册

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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  
C1  
1 F  
C2  
1 F  
Efficiency vs VIN Voltage  
100  
90  
125mA  
C1P C1M C2P C2M  
CPO  
MAIN  
SUB  
V
= 2.7V  
IN  
TO 5.5V  
80  
70  
V
IN  
C3  
2.2 F  
C6  
1 F  
LTC3230  
D1  
D2  
D3  
D4  
D5  
60  
50  
40  
ENM  
ENS  
ENM  
ENS  
MLED1  
MLED2  
MLED3  
MLED4  
SLED  
ENLDO1  
ENLDO2  
V1  
3230 TA01a  
30  
LDO1  
1.5V  
C4  
1 F  
200mA  
20  
4 LEDs AT 9mA/LED  
V2  
V
T
= 3V  
= 25°C  
R
2.8V  
200mA  
LDO2  
F
A
SET  
10  
0
R
GND  
SET  
C5  
1 F  
17.4k  
1%  
3
3.4 3.6 3.8  
(V)  
4
4.2 4.4  
3.2  
V
IN  
ENM OR ENS  
3230 TA01b  
SET BRIGHTNESS LEVEL ON  
OFF  
3230fa  
1
1234567...16

中文翻译

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