TPS74801: Question about drop voltage

mayumi.T

Part Number: TPS74801

Hello,

My customer wants to set "Vo: 1 V, Io: 0.959 A" at "Vin: 1.5 V, Vbias: 3.3 V, Ta: 0 to 60 ° C." using TPS74801.
In order to know the lower limit value of Vin, please tell me the value of "Vdo" under the above conditions.
I would appreciate it if you can get graphs of (Vbias - Vo) versus Vdo when Io is 1A.

Thank you.

over 6 years ago

0 Eric.Preiss over 6 years ago

TI__Expert 4350 points

Hi Mayumi,

With Vbias - Vo = 2.3 V in your application, Vin dropout (Vdo) = 110 mV on the worst case 125 ºC curve in Figure 6.
What is your customer's Vo tolerance requirement? Vin min = Vo max tolerance + Vdo.
For example: Vo = 1 V +/- 5%, then Vin min = 1.05 V + 110 mV = 1.16 V.
There is plenty of margin from Vin = 1.5 V to lower limit value of 1.16 V.

0 mayumi.T over 6 years ago in reply to Eric.Preiss

Expert 1015 points

Thank you very much for your kind response.

I am inquiring to customers.
If there is an answer, I will tell you.
> What is your customer's Vo tolerance requirement?

Best regards,
Mayumi

0 mayumi.T over 6 years ago in reply to Eric.Preiss

Expert 1015 points

Dear Eric,

My customer's output voltage tolerance is ± 5%.
So it is the same as your calculation example.
Thank you very much.

Best Regards,
Mayumi

Power management

Power management forum

TPS74801: Question about drop voltage