TPS62740: LOAD Pin

Nikos Antoniou

Part Number: TPS62740

Hi everyone,

I will use the TPS62740 in one of my designs. I will utilize the LOAD pin to supply some of the analog and digital components such as Voltage reference, Op Amp, Multiplexer, Flah memory etc.

So I have to use both AVdd and DVdd lines. I will split the LOAD pin output to create these voltage rails as shown below

My questions are:

1. Is this approach correct for creating AVdd and DVdd?

2. I have to decouple both legs or could I decouple right next the LOAD pin? Should I use the same RL filter provided at the datasheet (decoupling the Vout)?

Thanks in advance

Nick

over 4 years ago

0 Davor Pavlovski over 4 years ago

TI__Expert 3611 points

Hi Nick,

I would say that the best practice would be to decouple both the DVdd and AVdd by using LC filters for each leg (for high frequency attenuation a ferrite bead will be much better than an inductor), also bypass capacitors should be placed near the inputs of the ICs. You can read more about this here: Filtering Techniques: Isolating Analog and Digital Power Supplies

I recommend you check the data-sheets of the analog and digital components you are powering, they should have some recommended application circuits.

Regards,

Davor

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TPS62740: LOAD Pin