Timed current boost for DMOST driver with rapid turn-on and low quiescent current.

摘要

A power DMOST driver employs a diff-amp gate driver (14) that operates at a relatively low quiescent current when the DMOST (13) is on. Means are included for switching the DMOST (13) off and on in response to a control signal. When the DMOST (13) is to be switched from off to on the diff-amp tail current (I1) is briefly raised to a substantially higher value so that the DMOST parasitic gate capacitance (21,22) can quickly be driven to the on level. The tail current differential is large and determined by geometrically controlled IC quantities.