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LM27951 Datasheet

Part NameDescriptionManufacturer
LM27951 White LED Adaptive 1.5×/1× Switched-Capacitor Current Driver TI
Texas Instruments TI
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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.

Features
• 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
• 3/2×, 1× Gain Transition Based on LED Vƒ
• Peak Efficiency Over 85%
• PWM Brightness Control
• Very Small Solution Size - No Inductor
• Fixed 750-kHz Switching Frequency
• < 1-µA Shutdown Current

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

 

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