The LM2787 is a CMOS negative regulated switched capacitor voltage inverter that provides a very low noise adjustable output for devices with an input voltage in the range of +2.7V to +5.5V. This product uses four low-cost capacitors to provide up to 10mA of output current. The regulated output for the LM2787 is adjustable between -1.5V and -5.2V. The LM2787 operates at a switching frequency of 260kHz (typical) to reduce output resistance and voltage ripple. With an operating current of only 400µA (charge pump power efficiency greater than 90% with most loads) and 0.05µA typical shutdown current, the LM2787 is ideal for cellular phone power amplifier bias and other low current, low noise negative voltage needs. The device comes in small 8-Bump micro SMD and thin micro SMD packages.
The LM2787 is a CMOS negative regulated switched‑capacitor voltage inverter that provides a low‑noise, adjustable negative output from an input of 2.7 V to 5.5 V. It uses four low‑cost capacitors to deliver up to 10 mA of output current, with typical switching at 260 kHz, quiescent current of 400 pA, and shutdown current of 0.05 pA. The device is offered in 8‑Bump micro SMD and thin micro SMD packages.
The document includes ordering information, pin descriptions, absolute maximum ratings, electrical characteristics, and application notes such as setting the output voltage, capacitor selection, and mounting guidelines. It also provides performance graphs, physical dimensions, and land‑pattern recommendations for surface‑mount assembly.
| Adjustable Output Voltage | -1.5 V to -5.2 V |
|---|---|
| Typical Switching Frequency | 260 kHz |
| Typical Charge‑Pump Efficiency | 91 % at 10 mA |
| Quiescent Supply Current | 400 pA |
| Shutdown Supply Current | 0.05 pA (typical) |
The shutdown current is typically 0.05 pA.
The device is offered in 8‑Bump micro SMD and thin micro SMD packages.