LM2794TL/NOPB
ActiveCURRENT REGULATED SWITCHED CAPACITOR LED SUPPLY WITH ANALOG AND PWM BRIGHTNESS CONTROL
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LM2794TL/NOPB
ActiveCURRENT REGULATED SWITCHED CAPACITOR LED SUPPLY WITH ANALOG AND PWM BRIGHTNESS CONTROL
Technical Specifications
Parameters and characteristics for this part
| Specification | LM2794TL/NOPB |
|---|---|
| Applications | Backlight |
| Current - Output / Channel [custom] | 20 mA |
| Dimming | Analog, PWM |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Outputs | 4 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -30 °C |
| Package / Case | 14-WFBGA, DSBGA |
| Supplier Device Package | 14-DSBGA |
| Topology | Switched Capacitor (Charge Pump) |
| Type | DC DC Regulator |
| Voltage - Output | 3.8 V |
| Voltage - Supply (Max) | 5.5 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 2.03 | |
| 10 | $ 1.83 | |||
| 25 | $ 1.72 | |||
| 100 | $ 1.47 | |||
| Digi-Reel® | 1 | $ 2.03 | ||
| 10 | $ 1.83 | |||
| 25 | $ 1.72 | |||
| 100 | $ 1.47 | |||
| Tape & Reel (TR) | 250 | $ 0.97 | ||
| 500 | $ 0.85 | |||
| Texas Instruments | SMALL T&R | 1 | $ 1.53 | |
| 100 | $ 1.26 | |||
| 250 | $ 0.91 | |||
| 1000 | $ 0.68 | |||
Description
General part information
LM2794 Series
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.
Documents
Technical documentation and resources
