| 摘要 |
Power supply sequencing systems and methods are disclosed. In one embodiment, a programmable charge pump supplies a programmable current source, which drives an external NFET that controls whether power is supplied to a device or a portion of circuitry. The maximum voltage and the turn-on ramp rate supplied to the NFET are programmable and, therefore, the NFET can be operated safely within its rated limits without requiring external protection devices. If a high-voltage output terminal is not required to drive an external NFET, the output terminal, in accordance with another embodiment, may be configured to function as an open drain logic output terminal. |
