NCP1840:Fully Programmable Multi-Channel LED Driver
The NCP1840 is a highly integrated general purpose LED driver with the ability to drive up to eight LEDs. A high efficiency, low noise, quad mode charge pump allows the use of higher forward voltage LEDs while automatically maintaining a low operating battery voltage. Each of the eight driver currents is fully programmable, each utilizing a 5-bit current DAC. The current can be turned on or off achieving various dimming levels using a programmable 6-bit counter. The full-scale current of all eight current DACs is set by an external resistor. The NCP1840 requires only five small ceramic capacitors and one resistor to form a complete LED power supply and current controller. By utilizing a fourth mode (1.33x), the NCP1840's charge pump optimizes efficiency based on the voltage across the LED current sources. 1.33x mode can offer approximately 10 percent more efficiency than a typical 1.5x mode. The device powers up in 1x mode and will automatically boost to higher modes whenever any enabled LED current source begins to enter dropout. The first dropout switches the device into 1.33x mode, and subsequent dropouts switch the NCP1840 into 1.5x and 2x modes, respectively.
技术特性
- Serial input and serial or parallel output
- Enable input for output control
- Serial output enables cascade connection
- Low supply current (30µA typ. during standby ICC≤40µA)
- Serial input/output levels compatible with typical CMOS devices
- High-withstand-voltage LED driver with open drain output
High withstand voltage (VDS < 42V)
High-current drive (IO max = 100mA)
- Operating temperature range Ta = -25 to 75°C
- Output malfunction protection circuit , Reset input pin , VCC decrease voltage confirmation
应用
- Notebook Battery Power Indicator
- Multi-LED Status Indicators
- Small Format Display Drivers
- True-Green LED Applications
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终端产品
- Notebook Computers
- Toys and Games
- Electronic Musical Instruments
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 |
| NCP1840Q8A6MNG |
Active |
|
Fully Programmable Multi-Channel LED Driver, NCP1840Q8A6MN |
QFN-20 |
485E-01 |
1 |
Tube |
92 |
$1.5 |
| NCP1840Q8A6MNTWG |
Active |
|
Fully Programmable Multi-Channel LED Driver, NCP1840Q8A6MNTWG |
QFN-20 |
485E-01 |
1 |
Tape and Reel |
2500 |
$1.5 |
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