LP38693: Difference of "CMOS" LDO

Roy Chou1

Genius 12565 points

Part Number: LP38693
Other Parts Discussed in Thread: TLV755P, , LP5912, TPS745

Hi All,

I would like to know the difference between CMOS LDO(LP38693) and PMOS LDO(TLV755P).

Do we have the technical document between them?

Roy

over 4 years ago

0 Roy Chou1 over 4 years ago

TI__Genius 12565 points

Hi All,

AP7217 is the device that we would like to replace.

Do we have similar LDO device that we could compete? Their pin6 seems like a special function.

Roy

0 Stephen Ziel over 4 years ago

TI__Mastermind 29180 points

Hi Roy,

Both devices are CMOS based devices.
They both use PMOS pass elements.
We could help review the different specifications between the two devices using our online LDO tool, which you can see here, to help you down select between the two, if that helps.

I'll add someone from our marketing team to aid in selection of a P2P device with the AP7217 component.

Thanks,

- Stephen

0 Jose Gonzalez Torres over 4 years ago in reply to Stephen Ziel

TI__Intellectual 1146 points

Hi Roy,

Unfortunately I could not find an exact drop in from our portfolio. However we have many LDOs that have a similar function. We typically call this VDOUT a power good or reset pin.

In TI we have many devices that can perform similar to AP7217. Our TPS745 is our latest released family of 500mA LDOs with integrated power good (reset) but features a wider voltage operation. You can also look at our LP5912 family for fixed output voltage regulation with a power good pin.

0 Roy Chou1 over 4 years ago in reply to Stephen Ziel

TI__Genius 12565 points

Dear Stephen,

Thank you for your reply. I have this question because I review some LDO datasheet, some is showing they are CMOS LDO, the other are not showing. Like I mentioned previous. Why they show they are CMOS LDO, is that a special point that we could promote?

Regards,

Roy

0 Roy Chou1 over 4 years ago in reply to Jose Gonzalez Torres

TI__Genius 12565 points

Hi Jose,

Thank you for your reply, I will choose the suitable part to customer.

Regards,

Roy

0 Stephen Ziel over 4 years ago in reply to Roy Chou1

TI__Mastermind 29180 points

Hi Roy,

There are pro's and con's to CMOS and other types of transistor based LDO's.
The main technology which competes with CMOS is called bipolar junction transistor (BJT).
Most integrated circuit design is now CMOS based, so it would be hard to point at that and use it to promote a component, as the competitor's component is likely also CMOS based.

A good resource which gives the basics of BJT based linear regulators can be found here.
http://www.ti.com/lit/an/snva558/snva558.pdf

Another good resource which discusses both BJT and CMOS based linear regulators can be found here.
http://www.ti.com/lit/an/slva072/slva072.pdf

Thanks,

- Stephen

Power management

Power management forum

LP38693: Difference of "CMOS" LDO