multiple output linear regulator or multiple output switching regulator which is to be used

Swaminath Katte

Other Parts Discussed in Thread: TPS65023

I am designing multi-rail type power supply for microprocessor based system. It includes supply like 1.2V 0.85A (For Core), 3.3V 0.9A (For I/Os and peripheral) and system will operate on 400MHz clock signal. Which regulator is to be used for this type of application linear or switching . What all parameters I should consider while selecting regulator (except efficiency).

I got two IC in power management section one is linear regulator (TPS 70302) and other one is switching regulator ( TPS65023) . Please suggest which one is best?

over 9 years ago

0 JohnTucker over 9 years ago

TI__Guru**** 191445 points

Most will choose a switching regulator for your application. If you do not care about efficiency, you could use a linear regulator though. What is your input voltage?

0 Swaminath Katte over 9 years ago in reply to JohnTucker

Prodigy 50 points

hi,

Input voltage is 5 to 7VDC. If i use linear regulator then what will be the effect on output voltage(response) for 400MHz switching load.

0 JohnTucker over 9 years ago in reply to Swaminath Katte

TI__Guru**** 191445 points

400 MHz is far beyond the bandwidth of the regulator. It will appear as ripple on the output voltage.

Power management

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multiple output linear regulator or multiple output switching regulator which is to be used