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SNVS416C – NOVEMBER 2005 – REVISED FEBRUARY 2016 LM27951 White LED Adaptive 1.5×/1× Switched-Capacitor Current Driver
1 Features 3 Description The LM27951 is a switched capacitor white-LED
driver capable of driving up to four LEDs with 30 mA
through each LED. Its four 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 2.8 V to 5.5 V and
requires only four low-cost ceramic capacitors. 1 Input Voltage Range: 2.8 V to 5.5 V
Drives up to Four LEDs With up to 30 mA each
Regulated Current Sources with 0.2% (Typical)
Matching
3/2Г—, 1Г— Gain Transition Based on LED VЖ’
Peak Efficiency Over 85%
PWM Brightness Control
Very Small Solution Size -No Inductor
Fixed 750-kHz Switching Frequency …
