LM2795 Datasheet Text
LM2794, LM2795
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SNVS168L
- JANUARY 2002
- REVISED MAY 2013
LM2794 /LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
Check for Samples: LM2794, LM2795
Features
1
- 2 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
APPLICATIONS
- White LED Display Backlights
- White LED Keypad Backlights
- 1-Cell Li-Ion Battery-Operated Equipment Including PDAs, Hand-Held PCs, Cellular Phones
DESCRIPTION
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 acmodate four White LEDs. The switching frequency is 325kHz. (min.) to keep the conducted noise spectrum away from sensitive frequencies within portable RF devices....
