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LM2687 - Low Noise Regulated Switched Capacitor Voltage

Datasheet Summary

Description

The LM2687 CMOS Negative Regulated Switched Capacitor Voltage Inverter delivers a very low noise adjustable output for an input voltage in the range of +2.7V to +5.5V.

Four low cost capacitors are used in this circuit to provide up to 10mA of output current.

Features

  • n n n n n Inverts and regulates the input supply voltage Small MSOP-8 package 91% typical charge pump power efficiency at 10mA Low output ripple (1mV typical) Shutdown lowers Quiescent current to 0.05 µA (typical).

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Datasheet Details

Part number LM2687
Manufacturer National Semiconductor
File Size 222.31 KB
Description Low Noise Regulated Switched Capacitor Voltage
Datasheet download datasheet LM2687 Datasheet
Additional preview pages of the LM2687 datasheet.

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LM2687 Low Noise Regulated Switched Capacitor Voltage Inverter August 1999 LM2687 Low Noise Regulated Switched Capacitor Voltage Inverter General Description The LM2687 CMOS Negative Regulated Switched Capacitor Voltage Inverter delivers a very low noise adjustable output for an input voltage in the range of +2.7V to +5.5V. Four low cost capacitors are used in this circuit to provide up to 10mA of output current. The regulated output for the LM2687 is adjustable between −1.5V and −5.2V. The LM2687 operates at 100 kHz (typical) switching frequency to reduce output resistance and voltage ripple. With an operating current of only 500 µA (charge pump power efficiency greater than 90% with most loads) and 0.
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