Description
LM2794/LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control May 2003 LM2794/LM2795 Current Regulated Switch.
The LM2794/95 is a fractional CMOS charge-pump that provides four regulated current sources.
Features
* n Regulated current sources with ± 0.5% matching between any two outputs n High efficiency 3/2 boost function n Drives one, two, three or four white LEDs n 2.7V to 5.5V Input Voltage n Up to 80mA output current n Analog brightness control n Active-low or high shutdown input (’94/95) n Very small sol
Applications
* n White LED Display Backlights n White LED Keypad Backlights n 1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones
Basic Application Circuit
20028503
© 2003 National Semiconductor Corporation
DS200285
www. national. com
LM2794/LM2795
Connection Diagram
20028