Part # LM2795 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2794 LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control


Part Details:

Brightness LM2794/LM2795 March 2004 LM2794/LM2795 Control Current Regulated Switched Capacitor LED Supply withAnalog and PWM Brightness Control Current General Description Features The LM2794/95 is a fractional CMOS charge-pump that n Regulated current sources with ±0.5% matching provides four regulated current sources. It accepts an input between any two outputs voltage range from 2.7V to 5.5V and maintains a constant n High efficiency 3/2 boost function current determined by an external sense resistor. Regulated n Drives one, two, three or four white LEDs The LM2794/5 delivers up to 80mA of load current to accom- n 2.7V to 5.5V Input Voltage modate four White LEDs. The switching frequency is n Up to 80mA output current 325kHz. (min.) to keep the conducted noise spectrum away n Analog brightness control from sensitive frequencies within portable RF devices. n Active-low or high shutdown input ( 94/95) Brightness can be controlled by both linear and PWM tech- n Very small solution size and no inductor niques. A voltage between 0V and 3.0V may be applied to n 2.3µA (typ.) shutdown current the BRGT pin to linearly vary the LED current. Alternatively, Switched n 325kHz switching frequency (min.) a PWM signal can be applied to the SD pin to vary theperceived brightness of the LED. The SD pin reduces the n Constant Frequency generates predictable noise spectrum operating current to 2.3µA (typ.) The LM2794 is shut downwhen the SD pin is low, and the LM2795 is shut down when n Standard Micro SMD-14 package: 2.08mm X 2.403mm the SD pin is high. X 0.845mm High The LM2794/95 is available in a micro SMD-14 CSP pack- n Thin Micro SMD-14 package: 2.08mm X 2.403mm X 0.600mm High Capacitor age. Applicationsn White LED Display Backlights n White LED Keypad Backlights n 1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones LED Basic Application Circuit Supply with Analog and


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LM2795.pdf Datasheet