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參數資料
| 型號： | CAT4237TD |
| 英文描述： | High Voltage CMOS Boost White LED Driver |
| 中文描述： | 高電壓的CMOS升壓白光LED驅動器 |
| 文件頁數： | 1/13頁 |
| 文件大小： | 533K |
| 代理商： | CAT4237TD |
CAT4237
2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1 of 13
Doc. No. 5013, Rev. A
High Voltage CMOS Boost White LED Driver
Features
Drives 6 to 8 White LEDs in series from 3V
Up to 87% Efficiency
Low Quiescent Ground Current 0.6mA
Adjustable Output Current (up to 40mA)
High Frequency 1MHz Operation
High Voltage Power Switch
Shutdown current less than 1
μ
A
Open LED low power mode
Automatic Shutdown at 1.9V (UVLO)
Thermal shutdown protection
Thin SOT23 5-Lead (1mm max height)
Applications
Color LCD and keypad Backlighting
Cellular Phones
Handheld Devices
Digital Cameras
PDAs
Portable Game Machine
Ordering Information
Part
Number
CAT4237TS
TSOT23-5
CAT4237TD
TSOT23-5
Lead Free
1
Note 1: NiPdAu Lead Plating
Pin Configuration
Package
Quantity
per Reel
3000
3000
Package
Marking
LS
LT
Product Description
The CAT4237 is a DC/DC step-up converter that
delivers an accurate constant current ideal for
driving LEDs. Operation at a constant switching
frequency of 1MHz allows the device to be used
with small value external ceramic capacitors and
inductor. LEDs connected in series are driven
with a regulated current set by the external
resistor R1. LED currents up to 40mA can be
supported over a wide range of input supply
voltages from 2.8V to 5.5V, making the device
ideal for battery-powered applications. The
CAT4237 high-voltage output stage is perfect for
driving six, seven or eight white LEDs in series
with inherent current matching in LCD backlight
applications.
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 “zero” quiescent current.
In addition to thermal protection and overload
current limiting, the device also enters a very low
power operating mode during “Open LED” fault
conditions. The device is housed in a low profile
(1mm max height) 5-lead thin SOT23 package for
space critical applications.
Top View
5-Lead Thin SOT23
1mm max height
Typical Application Circuit
L: Sumida CDRH3D16-330
D: Central CMDSH05-4 (rated 40V)
C2: Taiyo Yuden UMK212BJ224 (rated 50V)
相關PDF資料 |
PDF描述 |
|---|---|
| CAT4237TS | High Voltage CMOS Boost White LED Driver |
| CAT4240 | 6 Watt Boost LED Driver |
| CAT4240TD-GT3 | 6 Watt Boost LED Driver |
| CAT507BP | 3.3V 32K/64K x 16/18 Dual-Port Static RAM |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| CAT4237TD-26771T3 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT4237TD-GT3 | 功能描述:LED照明驅動器 LED Driver,Boost 8 LED,series RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4237TD-GT3 | 制造商:ON Semiconductor 功能描述:IC, WHITE LED DRIVER, BOOST, TSOT-23-5 |
| CAT4237TD-T3 | 功能描述:LED照明驅動器 High Voltage Boost White LED RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4237TS | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
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