LM2794
- 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.
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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LM2794,LM2795 Current Reg Switched Cap LED Sup w/Analog & PWM Brightness Control datasheet (Rev. L) | 2013/5/2 | |||
| 白皮書 | Common LED Functions and LED Driver Design Considerations | 2020/9/21 | ||||
| 應用說明 | Switched Cap Circuits Provide Efficient and Functional White LED Drive (Rev. B) | 2013/4/30 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| DSBGA (YPA) | 14 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。