Part # LM2687 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2687 Low Noise Regulated Switched Capacitor Voltage Inverter


Part Details:

LM2687 April 2003 Low LM2687Low Noise Regulated Switched Capacitor Voltage Noise InverterGeneral Description Features Regulated The LM2687 CMOS Negative Regulated Switched Capacitor n Inverts and regulates the input supply voltage Voltage Inverter delivers a very low noise adjustable output n Small MSOP-8 or LLP-8 package for an input voltage in the range of +2.7V to +5.5V. Four low n 91% typical charge pump power efficiency at 10mA cost capacitors are used in this circuit to provide up to 10mA n Low output ripple (1mV typical) of output current. The regulated output for the LM2687 is n Shutdown lowers Quiescent current to 0.05 µA (typical) adjustable between -1.5V and -5.2V. The LM2687 operatesat 100 kHz (typical) switching frequency to reduce output Applications Switched resistance and voltage ripple. With an operating current ofonly 500 µA (charge pump power efficiency greater than n Wireless Communication Systems 90% with most loads) and 0.05 µA typical shutdown current, n Cellular Phone Power Amplifier Biasing the LM2687 provides ideal performance for cellular phone n Interface Power Supplies power amplifier bias and other low current, low noise nega- n Handheld Instrumentation tive voltage needs. The device comes in a small 8-pin MSOP n Laptop Computers and PDA s or LLP package. Capacitor Typical Application Circuit Voltage Inverter 10118001 Connection Diagrams 8-Pin MSOP 8-Pin LLP 10118002 10118025 © 2003 National Semiconductor Corporation DS101180 www.national.com Ordering Information for MSOP Package LM2687 Device Order Number Package Number Package Marking* Supplies As LM2687MM MUA08A S12A


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LM2687.pdf Datasheet