- 制造厂商：TI
- 产品类别：电源管理
- 技术类目：LED 驱动器 - 背光 LED 驱动器
- 功能描述：具有模拟和 PWM 亮度控制功能的电流调节开关电容器 LED 电源
- 点击这里打开及下载LM2794的技术文档资料
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The LM2794/95 is a fractional CMOS charge-pump that provides four regulated current sources. It accepts an input voltage range from 2.7V to 5.5V and maintains a constant current determined by an external sense resistor.
The LM2794/5 delivers up to 80mA of load current to accommodate four White LEDs. The switching frequency is 325kHz. (min.) to keep the conducted noise spectrum away from sensitive frequencies within portable RF devices.
Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3µA (typ.) The LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high.
The LM2794/95 is available in a DSBGA CSP package.
- Regulated Current Sources with ±0.5% Matching between any Two Outputs
- High Efficiency 3/2 Boost Function
- Drives One, Two, Three or four White LEDs
- 2.7V to 5.5V Input Voltage
- Up to 80mA Output Current
- Analog Brightness Control
- Active-Low or High Shutdown Input ('94/95)
- Very Small Solution Size and no Inductor
- 2.3μA (typ.) Shutdown Current
- 325kHz Switching Frequency (min.)
- Constant Frequency Generates Predictable Noise Spectrum
- Thin DSBGA Package: 2.08mm X 2.403mm X 0.600mm High
All trademarks are the property of their respective owners.
- Number of channels (#)
- 4
- Vin (Min) (V)
- 2.7
- Vin (Max) (V)
- 5.5
- Vout (Min) (V)
- 2.7
- Vout (Max) (V)
- 5.5
- Type
- Capacitive
- Switching frequency (Max) (kHz)
- 675
- LED current per channel (mA)
- 20
- Peak efficiency (%)
- 80
- Topology
- Boost
- Features
- Analog/PWM Mixed Dimming
- Operating temperature range (C)
- -30 to 85
LM2794的完整型号有：LM2794TL/NOPB，以下是这些产品的关键参数及官网采购报价：
LM2794TL/NOPB，工作温度：-30 to 85，封装：DSBGA (YPA)-14，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM2794TL/NOPB的批量USD价格：.683（1000+）
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