TLV1117: Stability of the LDO with 1uF capacitor

Shaury Anand

Part Number: TLV1117
Other Parts Discussed in Thread: TLV767,

Hi,
Is below circuit stable with 1uF ceramic output capacitor? The datasheet says that -this device is designed to be stable with tantalum and
aluminum electrolytic output capacitors having an ESR between 0.2 Ω and 10 Ω.

Regards,

Shaury

over 2 years ago

0 Nick Butts over 2 years ago

TI__Mastermind 43215 points

Shaury,

This device needs minimum 200mΩ ESR for the output cap. Ceramic caps have about 10mΩ ~ 20mΩ ESR so they are not suitable for this device without a series resistor.

Have they considered the TLV767? It is an improved, cost-effective device but is not P2P. It looks like in their schematic they are looking for a P2P drop-in to replace a device already on the board.

Regards,

Nick

0 Shaury Anand over 2 years ago in reply to Nick Butts

TI__Intellectual 1540 points

Hi Nick,

In the previous schematic I used LP3869 that is stable with ceramic capacitors. I didn't realize TLV1117 is not stable with ceramic capacitors. Is there a p2p that is stable with ceramic capacitors.

Regards,

Shaury

0 Nick Butts over 2 years ago in reply to Shaury Anand

TI__Mastermind 43215 points

Shaury,

I looked through our portfolio and I don't believe we have anything that will work as a drop-in here.

Regards,

Nick

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TLV1117: Stability of the LDO with 1uF capacitor