The LM2751 is a 2X, 1.5X regulated switched capacitor white LED driver. It offers 4.5V and 5.0V regulated output voltage options and provides up to 150mA of output current in the 2.8V to 5.5V input voltage range, requiring only four low-cost ceramic capacitors. It 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. The LM2751 uses constant frequency pre-regulation to minimize conducted noise on the input and provide a predictable switching frequency. The switching frequency is programmable to 725kHz, 300kHz, 37kHz, or 9.5kHz. The LM2751 is available in a 10-pin Leadless Leadframe No-Pullback package: LLP-10.
The LM2751 is a constant‑frequency switched‑capacitor charge‑pump LED driver that provides regulated 4.5 V or 5.0 V outputs. It operates over an input range of 2.8 V to 5.5 V and can deliver up to 150 mA (4.5 V) or 80 mA (8.0 V) without using an inductor, achieving peak efficiencies above 90 %. The device is offered in a 10‑pin Leadless Leadframe No‑Pullback (LLP‑10) package measuring 3 mm × 3 mm × 0.8 mm.
Key features include selectable gain of 2× or 1.5×, programmable switching frequencies (725 kHz, 300 kHz, 37 kHz, 9.5 kHz), low output ripple (8 mV), and thermal shutdown at 150 °C. Typical applications are white LED display and keypad backlights, and the document provides connection diagrams, pin descriptions, ordering information, and performance graphs.
| Regulated Output Voltage Options | 4.5 V, 5.0 V |
|---|---|
| Output Current Capability | 150 mA (4.5 V) or 80 mA (8.0 V) |
| Input Voltage Range | 2.8 V to 5.5 V |
| Selectable Switching Frequencies | 725 kHz, 300 kHz, 37 kHz, 9.5 kHz |
| Gain Options | 2× or 1.5× |
| Peak Efficiency | >90 % |
| Typical Shutdown Current | <1 µA |
The LM2751 can be configured for a regulated output of either 4.5 V or 5.0 V.
The device operates with an input voltage from 2.8 V up to 5.5 V.
The switching frequency is programmable to 725 kHz, 300 kHz, 37 kHz, or 9.5 kHz.