US 2020/0028503 A1 · SEMICONDUCTOR DEVICE AND ELECTRONIC CONTROL DEVICE

Abstract

A semiconductor device and electronic control device capable of shutting off the reverse current flow from a load to a power supply is provided. The power transistor QN1 is provided between the positive power supply terminal Pi2(+) and the load-driving terminal Po2(+), and has a source and a back-gate coupled to the positive power supply terminal Pi2(+). The power transistor QN2 is provided in series with the power transistor QN1, and its sources and backgates are coupled to the load-driving terminal Po2(+). The booster CP1a charges the gates of the power transistors QN1. The gate discharge circuit DCG1a discharges the gate charge of the power transistor QN1 to the source when the potential of the negative power supply terminal Pi2(−) is higher than the potential of the positive power supply terminal Pi2(+).

Claims20

Dependent claims

A semiconductor device comprising:

a positive power supply terminal and a negative power supply terminal coupled to a power supply and
a load drive terminal coupled to a load;
wherein a source and a back gate of a first power transistor is coupled to the positive power supply terminal side and a drain of the first power transistor is coupled to the load drive terminal side;
and
wherein a source and a back gate of a second power transistor is coupled to the load drive terminal and a drain of the second power transistor is coupled to the positive power supply terminal;
and
a first boost circuit for charging a gate of the first power transistor;
and
a first gate discharge circuit for discharging gate potential of the first power transistor to the source when the potential of the negative power terminal is higher than the potential of the positive power terminal.

6 more elements

An electronic control device comprising:

a microcontroller and a relay device and a battery and a load;
wherein the relay device is comprising;
a positive power supply terminal and a negative power supply terminal coupled to the battery and
a load drive terminal coupled to a load;
wherein a source and a back gate of a first power transistor is coupled to the positive power supply terminal side and a drain of the first power transistor is coupled to the load drive terminal side;
and
wherein a source and a back gate of a second power transistor is coupled to the load drive terminal and a drain of the second power transistor is coupled to the positive power supply terminal;
and
a first boost circuit for charging a gate of the first power transistor;
and
a first gate discharge circuit for discharging gate potential of the first power transistor to the source when the potential of the negative power terminal is higher than the potential of the positive power terminal.

8 more elements

Dependencies are inferred from the claim text.

Semiconductor device and electronic control device

Life of this patent

Semiconductor device and electronic control device

Life of this patent

Abstract

Claims20