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2022-09-24 23:33:15
LM2780 - Ultra Low Ripple Switched Capacitor Voltage Source Inverter
The LM2780 is a charge pump that inverts the input voltage at corresponding output voltages ranging from 1.8V to 5.5V to 1.8V to -5.5V. With three or four low-cost external ceramic capacitors, the LM2780 can provide up to 50mA of output current. The LM2780 operates at a typical switching frequency of 12kHz to minimize supply current (60µA typ.). The two charge pumps operate 180° out of phase, significantly reducing output voltage ripple compared to conventional single-phase charge pump circuits. If larger output ripple can be tolerated, optional capacitor C2 can be omitted to reduce solution cost and size. The LM2780 is available in an 8-pin micro SMD chip scale package. See also: LM2781, fast clock (210kHz typ), this version topology with lower output voltage ripple.
Features Inverted Input Voltage Ultra Low Voltage Ripple and Typical Output Impedance 8Ω with Two Jumper Capacitors n18Ω Output Resistance with One Jumper Capacitor
12kHz (typ) switching frequency
8-pin micro SMD package (1.4mm x 1.4mm x 0.5mm)
Applications Cell Phone Pagers Handheld Computers Operational Amplifiers Power Interfaces Power Handheld Instruments