Help interpreting a voltage regulator data sheet.

[DTJ]

Does this voltage regulator require a diode across it to discharge any capacitance on its output when the power supply is removed?

TS9011SCX RFG
3.3V out reg, 250mA, Max 12V in.

http://docs-asia.electrocomponents.com/webdocs/1386/0900766b813863e7.pdf

The data sheet says:

A 1µF or greater can be used as an output capacitor. TS9011 are prevented device failure under the
worst operation condition with both thermal shutdown and current fold-back.

It does not show a diode across the pass element in the block diagram in the data sheet.

 

[Ian.M]

It shows a MOSFET as the series pass device, so its body diode will already provide some protection, shunting reverse current.  Its probably dissipation limited, and as the pass transistor SOA graph is unknown, it would be advisable to be conservative and if there is a significant chance of the input being hard shorted to ground or dropping at a rate that would pull more than 400mA (assuming the body diode can handle the regulator short circuit current) back out of the output capacitor for more than a few us, add a Schottky diode, either antiparallel or in series with the input.

[DTJ]

It shows a MOSFET as the series pass device, so its body diode will already provide some protection, shunting reverse current.  Its probably dissipation limited, and as the pass transistor SOA graph is unknown, it would be advisable to be conservative and if there is a significant chance of the input being hard shorted to ground or dropping at a rate that would pull more than 400mA (assuming the body diode can handle the regulator short circuit current) back out of the output capacitor for more than a few us, add a Schottky diode, either antiparallel or in series with the input.

Ok, thanks Ian. I have a series diode on the input so I guess I can rely on that.