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LM2751SDX-B Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2751SDX-B Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page LM2751 Regulated 2X, 1.5X Switched Capacitor White LED Driver General Description The LM2751 is a constant frequency switched capacitor charge pump with regulated output voltage options of 4.5V, and 5.0V. Over the input voltage range of 2.8V to 5.5V the LM2751 provides up to 150mA of output current and requires only four low-cost ceramic capacitors. The LM2751 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or 2. The proper gain for maintaining regulation is chosen so that efficiency is maximized over the input voltage range. LM2751 uses constant frequency pre-regulation to minimize conducted noise on the input and provide a predictable switching frequency. The switching frequency is program- mable to 725kHz, 300kHz, 37kHz, or 9.5kHz. LM2751 is available in a 10-pin Leadless Leadframe No- Pullback Package: LLP-10. Features n Regulated Output Options: 4.5V, 5.0V n Output Voltage Regulated within 3% n Peak Efficiency Over 90% n 150mA (4.5V) or 80mA (5.0V) Output Current Capability n Input Voltage Range: 2.8V to 5.5V n Low Input and Output Voltage Ripple n < 1µA Typical Shutdown Current n Small Solution Size - NO INDUCTOR n Programmable 725kHz, 300kHz, 37kHz, or 9.5kHz Switching Frequencies n 10-pin LLP No-Pullback Package: 3mm x 3mm x 0.8mm Applications n White LED Display Backlights n White LED Keypad Backlights n General Purpose 2x, 1.5x Regulated Charge Pump Typical Application Circuit 20112101 LM2751 2x/1.5x Efficiency vs. 2x Charge Pump Effciency 20112128 April 2005 © 2005 National Semiconductor Corporation DS201121 www.national.com |
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