LM9061MXSLASHNOPB datasheet(20/33 Pages) TI1

20 / 33 page

LM9061, LM9061-Q1

SNOS738H – APRIL 1995 – REVISED JANAURY 2015

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7.4 Device Functional Modes

7.4.1 Operation With VCC > 30 V

If VCC increases to more than typically 30 V the LM9061 will turn off the MOSFET to protect the load from

excessive voltage. When VCC has returned to the normal operating range the device will return to normal

operation without requiring toggling the ON/OFF input. This feature will allow MOSFET operation to continue in

applications that are subject to periodic voltage transients, such as automotive applications.

7.4.2 Operation With VCC < 6.2 V

When VCC falls below the UVSO threshold of 6.2 V the charge pump will be disabled and the gate will be

discharged at the Normal-OFF current sink rate, typically 110

μA.

7.4.3 Operation With ON/OFF Control

In the ON state, the charge pump voltage, which is well above the available VCC supply, is directly applied to the

gate of the MOSFET. When commanded OFF a 110 µA current sink discharges the gate capacitances of the

MOSFET for a gradual turn-OFF characteristic to minimize the duration of inductive load transient voltages and

further protect the power MOSFET.

7.4.4 MOSFET Latch-OFF

In the event of excessive power dissipation in the MOSFET as detected by the LM9061 sense and threshold

pins, the MOSFET is latched OFF to prevent permanent failure. It will not restart until the ON/OFF Input is

toggled low then high.

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LM9061MX/NOPB Datasheet(PDF) 20 Page - Texas Instruments