TLV3691 - request for supply current vs input voltage plot

Chundra Ramful1

Other Parts Discussed in Thread: TLV3691

Thank you Emrys,

You are correct, this is about a very low power application. As Clemens suggested in his reply, I have been looking for a low voltage comparator and I found the TLV3691 which has an amazingly low operating voltage as well as exceptionally low supply current. Could you please clarify the points raised below?

Does the use of such a device help avoid excessive power consumption when the input signal is slowly evolving close to the +ve and -ve trip points? The time involved may be as long as 30 mins in some instances. Is there any way of minimising power consumption in such a case? If not, I have to review the complete strategy...

Also, contrary to ON Semiconductor and ST Microelectronics (TS880 & NCS2200), the TLV3691 does not provide a plot of current consumption v/s toggling frequency. Any reason? Can I get this information?

Chundra

over 3 years ago

0 Emrys Maier over 3 years ago

TI__Guru* 96591 points

Hi Chundra,

I have split your post to a new forum so that the amplifiers team will respond to your questions regarding the TLV3691.

The original thread is here: https://e2e.ti.com/support/logic/f/151/t/946273

0 Clemens Ladisch over 3 years ago

Guru 244220 points

Comparators are designed for analog inputs, so there are no cross currents. The 0.2 µA specification is the worst case.

Where do you get the reference voltage from? It might make sense to switch off part of the circuit for most of the time.

The TS880 and NCS2200 have shorter propagation delays. The TLV3691 is not used in applications where you care about the toggling frequency.

0 Chuck Sins over 3 years ago in reply to Clemens Ladisch

TI__Mastermind 23425 points

the only point to add is that the integrated hysteresis of the TLV3691 which is 17mV will greatly help when the input remains close to the switching threshold. It helps by requiring the input to overcome the hysteresis level before the output can transition back to the previous output logic level.

Chuck

Amplifiers

Amplifiers forum

TLV3691 - request for supply current vs input voltage plot