11 Power Supply Recommendations

11.1 Supply

The UCD7K devices accept an input range of 4.5 V to 15 V. The device has an internal precision linear regulator

that produces the 3V3 output from this VDD input. A separate pin, PVDD, not connected internally to the VDD

supply rail provides power for the output drivers. In all applications the same bus voltage supplies the two pins. It

is recommended that a low value of resistance be placed between the two pins so that the local capacitance on

each pin forms low pass filters to attenuate any switching noise that may be on the bus.

Although quiescent VDD current is low, total supply current will be higher, depending on the gate drive output

current can be calculated from:

relatively low ESR should be connected to the PVDD pin, to help deliver the high current peaks to the load. The

capacitors should present a low impedance characteristic for the expected current levels in the driver application.

The use of surface mount components for all bypass capacitors is highly recommended.

11.2 Reference and External Bias Supply

All devices in the UCD7K family are capable of supplying a regulated 3.3-V rail to power various types of

external loads such as a microcontroller or an ASIC. The onboard linear voltage regulator is capable of sourcing

up to 10 mA of current. For normal operation, place a minimum of 0.22 µF of ceramic capacitance from the

reference pin to ground.

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UCD7100

SLUS651E – MARCH 2005 – REVISED NOVEMBER 2021

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