LM2794 Datasheet | Texas Instruments

LM2794, LM2795 .ti. 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 - 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 80m A 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 - 325k Hz 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 80m A of load current to acmodate four White LEDs. The switching frequency is 325k Hz. (min.) to keep the conducted noise spectrum away from sensitive frequencies within portable RF devices. Basic Application...