CAT4237:LED Driver, Boost, 8 LED, series
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 1 MHz 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 40 mA can be supported over a wide range of input supply voltages from 2.8 V to 5.5 V, 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.
技术特性
- Drives 6 to 8 White LEDs in series from 3 V
- Up to 87% efficiency
- Low Quiescent Ground Current 0.6 mA
- Adjustable Output Current (up to 40 mA)
- High Frequency 1 MHz Operation
- High Voltage Power Switch
- Shutdown current less than 1 µA
- Open LED low power mode
- Automatic Shutdown at 1.9 V (UVLO)
- Thermal shutdown protection
- Digital Still Cameras
应用
- Color LCD and Keypad Backlighting
- Digital Cameras
终端产品
- Mobile Phones
- Portable Gaming Systems
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封装图 PACKAGE DIMENSIONS
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订购信息 Ordering Information
| 产品 |
状况 |
Compliance |
具体说明 |
封装 |
MSL* |
容器 |
预算价格 (1千个数量的单价） |
| 类型 |
外形 |
类型 |
数量 |
| CAT4237TD-GT3 |
Active |
|
LED Driver, Boost, 8 LED, series |
TSOT-23-5 |
419AE |
1 |
Tape and Reel |
3000 |
$0.5333 |
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