LM27951SDX

LM27951 www.ti.com SNVS416B – NOVEMBER 2005 – REVISED MAY 2013 LM27951 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver Check for Samples: LM27951 FEATURES DESCRIPTION • • The LM27951 is a switched capacitor white-LED driver capable of driving up to 4 LEDs with 30mA through each LED. Its 4 tightly regulated current sources ensure excellent LED current and brightness matching. LED drive current is programmed by an external sense resistor. The LM27951 operates over an input voltage range from 2.8V to 5.5V and requires only four low-cost ceramic capacitors. 1 2 • • • • • • • • Drives up to 4 LEDs with up to 30mA each Regulated current sources with 0.2%(typ.) matching 3/2x, 1x Gain transition based on LED VF Peak Efficiency Over 85% Input Voltage Range: 2.8V to 5.5V PWM Brightness Control Very Small Solution Size - NO INDUCTOR Fixed 750kHz Switching Frequency