LM2793 Datasheet | National Semiconductor

Description The LM2793 is a highly efficient, semi-regulated 1.5x CMOS charge pump that provides dual constant current outputs. The LM2793 has an input voltage range of 2.7V to 5.5V. To control LED brightness, the amount of current driven to the current-mode outputs can be adjusted with an analog voltage and/or a pulse-width-modulated (PWM) square wave. Pre-regulation of the charge pump minimizes conducted noise on the input. bined with a fixed switching frequency of 500k Hz, the LM2793 is a low-noise solution. The LM2793 is available in a 10-pin Leadless Lead-frame package: LLP-10. Features n Two Regulated Current Outputs, up to 16m A Each, Matched to Within ± 0.3% (typ.) n High Efficiency, 1.5x Regulated Charge Pump n Input Voltage Range: 2.7V to 5.5V n Soft Start Limits Inrush Current n Analog Voltage Brightness Control n PWM Brightness Control n Very Small Solution Size - NO INDUCTOR n 500k Hz Switching Frequency n 3µA (typ.) Shutdown Current n LLP-10 Package: 3.0mm X 3.0mm X 0.8mm 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 n Flat Panel Displays Typical Application Circuit © 2003 National Semiconductor Corporation DS200636 .national. Connection Diagram LM2793 10-pin Leadless Leadframe Package (LLP-10) 3mmx3mmx0.8mm NS Package Number LDA10A Top View Ordering Information Order Number LM2793LD LM2793LDX Package Description LLP-10 LLP-10 Package Marking LM2793 LM2793 Supplied as Tape and Reel (Units) 1000 4500 Pin Description Pin 1 2 3 4 5 6 7 8 Name VIN C1C2+ C1+ POUT D1 D2 SD-BRGT Power supply voltage connection Flying capacitor C1 connection Flying capacitor C2 connection Flying capacitor C1 connection Charge pump output Current source output / LED connection Current source output / LED connection Dual function Shutdown - Brightness. Grounding pin shuts down part. Voltage between 0.75V and 2.75V (typ.)...