JAJSCO4C November 2016 – September 2020 TPS22976
The TPS22976 is a 5.7-V, dual-channel, 14-mΩ (typical) RON load switch in a 14-pin WSON package. Each channel can support a maximum continuous current of 6 A and is controlled by an on and off GPIO-compatible input. To reduce the voltage drop in high current rails, the device implements N-channel MOSFETs. Note that the ON pins must be connected and cannot be left floating. The device has a configurable slew rate for applications that require specific rise-time, which controls the inrush current. By controlling the inrush current, power supply sag can be reduced during turnon. Furthermore, the slew rate is proportional to the capacitor on the CT pin. See the Adjustable Rise Time section to determine the correct CT value for a desired rise time.
The internal circuitry is powered by the VBIAS pin, which supports voltages from 2.5 V to 5.7 V. This circuitry includes the charge pump, QOD (optional), and control logic. When a voltage is applied to VBIAS, and the ON1,2 pins transition to a low state, the QOD functionality is activated. This connects VOUT1 and VOUT2 to ground through the on-chip resistor. The typical pulldown resistance (RPD) is 230 Ω.
During the off state, the device prevents downstream circuits from pulling high standby current from the supply. The integrated control logic, driver, power supply, and output discharge FET eliminates the need for any external components, reducing solution size and bill of materials (BOM) count.