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LQH32CN4R7M11 PDF预览

LQH32CN4R7M11

更新时间： 2024-09-28 12:34:19
品牌 Logo 应用领域
安森美 - ONSEMI 驱动器电感器射频感应器
页数 文件大小 规格书
11页 172K
描述
CMOS White LED Driver

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中文翻译

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LQH32CN4R7M11 数据手册

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CAT32  
CMOS White LED Driver  
Description  
The CAT32 is a DC/DC step up converter that delivers a regulated  
output current. Operation at a constant switching frequency of  
1.2 MHz allows the device to be used with very small value external  
inductor and ceramic capacitors.  
http://onsemi.com  
The CAT32 is targeted to drive multiple white light−emitting diodes  
(LEDs) connected in series and provides the necessary regulated current  
to control the brightness and the color purity. An external resistor R  
SET  
1
controls the output current level. LED currents of up to 40 mA can be  
supported over a wide range of input supply voltages from 2 V to 7 V,  
making the device ideal for battery−powered applications.  
A high voltage output stage allows up to 4 White LEDs to be driven  
in series. Series drive provides inherent current matching.  
LED dimming can be done by using a DC voltage, a logic signal, or  
a pulse width modulation (PWM) signal. The shutdown input pin  
allows the device to be placed in power−down mode with “near zero”  
quiescent current.  
In addition to overcurrent limiting protection, the device also  
includes detection circuitry to ensure protection against open−circuit  
load fault conditions.  
The device is available in a low profile (1 mm max height) 6−lead  
TSOT−23 package.  
TSOT−23  
TD SUFFIX  
CASE 419AF  
PIN CONNECTIONS  
1
VIN  
SW  
GND  
LED  
SHDN  
RSET  
TSOT−23  
1 mm Maximum Height  
q
= 250°C/W (free air)  
JA  
(Top View)  
Features  
• Low Quiescent Ground Current (0.5 mA Typical)  
• Power Efficiency Over 80%  
• Compatible Pinout with LT1932  
MARKING DIAGRAMS  
• Adjustable Output Current (up to 40 mA)  
• High Frequency 1.2 MHz Operation  
• Input Voltage Operation down to 2.0 V  
• Low Resistance (0.5 W) High Voltage Power Switch  
• Drives up to 4 White LEDs in Series  
• Shutdown Current Less than 1 mA  
LLYM  
VFYM  
LL = CAT32TDI−T3  
VF = CAT32TDI−GT3  
Y = Production Year (Last Digit)  
M = Production Month (1−9, A, B, C)  
• Load Fault Protection Against Open−circuits  
• Low Value External Components  
ORDERING INFORMATION  
• Low Profile (1 mm) TSOT−23 6−lead Package  
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS  
Compliant  
Device  
Package  
Shipping  
CAT32TDI−T3  
TSOT−23  
(Pb−Free)  
3,000/  
Tape & Reel  
Applications  
CAT32TDI−GT3  
TSOT−23  
(Pb−Free)  
3,000/  
Tape & Reel  
• Color LCD and Keypad Backlighting  
• Cellular Phones  
• Handheld Terminals  
• Digital Cameras  
• PDAs/Games  
• Portable MP3 Players  
©
Semiconductor Components Industries, LLC, 2010  
1
Publication Order Number:  
March, 2010 − Rev. 4  
CAT32/D  
1234567...11

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