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TPS7A10: LDO Selection

Daniel De Sousa
Intellectual 570 points
Part Number: TPS7A10
Other Parts Discussed in Thread: TPS74901, TPS74701, TPS74801,

Hi there, I am looking for an LDO with the following specifications:
VIN = 1V1
VOUT = 0.8V
IOUT peak = 150 mA
Vout tolerance = 0.78V min - 0.82V max

1. Would the TPS7A1008PDSE be a good fit for this application?

In the datasheet, they mention "To make sure that the output voltage is well regulated and dynamic performance is optimum, the input supply must be at least VOUT(nom) + 0.5 V and VBIAS = VOUT(nom) + 1.05 V."

Please confirm if okay. We can use a 5V bias voltage

2. Would the TPS74901 / TPS74801 / TPS74701 be better fits? My concern is that they have a max output voltage tolerance of +/- 2%. Does this take into account the tolerance of the output resistor divider that would be required for this part? If we plan on using 1% feedback resistors, would this work?


Thanks in advance

  • 0
    TI__Genius 13095 points

    Hi Daniel,

    TPS7A10 seems like a great fit for your application, many customers use TPS7A10 with less than 500mV between Vin and Vout, especially at lower load like yours. From a DC accuracy point of view you will be very close to +-1.5% (-40C to 125C) which is better than your listed requirement. Since your Vin to Vout differential is not 500mV, there will be a slight degradation in the accuracy but the change due to Vin line regulation is 0.001% per Volt so you're talking about a VERY small change. 

    The comment in the datasheet about a well regulated supply is just a note to make sure that any line transients on Vin do not put the LDO into dropout.

    Your second question is a good one, because adjustable LDO accuracy specs do not account for the external resistors (since a customer could use 0.1% resistors or they could use 10%), so it looks like TPS7A10 would be the better choice for your applications.