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2022-09-24 23:33:15
LM2787 - Low Noise Regulated Switched Capacitor Voltage
The LM2787's CMOS negatively regulated switched capacitor high voltage inverter provides a very low noise adjustable output in the range of +2.7 V with an input voltage of +5.5 V. Four low-cost capacitors are used in this circuit 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 260 kHz (typ) to reduce output resistance and voltage ripple. With an operating current of only 400µA (greater than 90% of the charge pump's power efficiency at maximum load) and a shutdown current of 0.05µA (typ), the LM2787 provides ideal performance for cell phone power amplifier biasing and other low current, low noise negatives voltage requirements. The device is housed in a small 8-bump micro SMD package.
Features Inverted and Regulated Input Voltage Small 8-Ball Micro SMD Package
91% Typical Charge Pump at 10mA Power Efficiency Low Output Ripple Shutdown Quiescent Current Reduced to 0.05µA (typ)
Applications Wireless Communication Systems Cellular Phones Power Amplifiers Bias Interface Power Supplies Handheld Instruments Laptops and PDAs