SGM3803

The SGM3803 is a constant frequency, current mode, synchronous step-up switching regulator with 200mA negative charge pump inverter which generates an unregulated negative output voltage from an input voltage range of 1.4V to 5.5V. The device is typically used to generate +5V and -5V from battery.

High switching frequency minimizes the sizes of inductor and capacitor. The device requires only three external capacitors for a complete DC/DC charge pump inverter. Integrated power MOSFETs and internal compensation of boost DC/DC make the SGM3803 simple to use and optimized for compact solutions.

The negative charge pump inverter of the SGM3803 is capable of providing 200mA output current. The typical conversion efficiency exceeds 80% over a wide output current range.

The SGM3803 boost DC/DC enters the power-save mode at light loads to maintain high efficiency. Anti-ringing control circuitry reduces EMI concerns by damping the inductor in discontinuous mode. The SGM3803 boost DC/DC provides true output disconnect, thus allowing VOUT1 to go to zero volt during shutdown without drawing any current from the input source. The SGM3803 supports 1.8V logic for control.

The output voltage of the boost DC/DC can be programmed by an external resistor divider. Boost DC/DC and negative charge pump inverter have independent enable control.

The device is available in a TDFN-3×3-12L package. It operates over an ambient temperature range of -40℃ to +85℃.