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LM27951 Datasheet

Part NameDescriptionManufacturer
LM27951 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver National-Semiconductor
National ->Texas Instruments National-Semiconductor
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General 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 3.0V to 5.5V and requires only four low-cost ceramic capacitors.

Features
■ 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: 3.0V to 5.5V
■ PWM Brightness Control
■ Very Small Solution Size - NO INDUCTOR
■ Fixed 750kHz Switching Frequency
■ <1µA Shutdown Current
■ 14-pin LLP Package: 4.0mm X 3.0mm X 0.8mm

Applications
■ White LED Display Backlights
■ White LED Keypad Backlights
■ General Purpose LED Lighting

 

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