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Things to avoid when using voltage regulators?

Power Supply Design - Multiple Voltage RegulatorsConnecting several power regulators to a single voltage inputUsing Linear Voltage Regulators in Series?Different power sources for pcbEnsuring common ground in a circuit with several voltage requirementsWhy do linear voltage regulators have minimum output voltage > 0 VPower circuit with several voltage regulators — design rulesthe proper way to wire up multiple supply railscan I use Two Same Power supply sharing input in single circuit?Power source project

3

$begingroup$

My project has components that operate at 3 different voltages (9, 5 and 3.3). I would like to only deal with one power source. Is it alright to feed one 12 V power source to 3 voltage regulators? Is there a smarter way of getting everything powered from a common source? I want to avoid placing the components in series.

power-supply voltage-regulator

share|improve this question

asked 4 hours ago

DanielPatrickDanielPatrick

161

New contributor

DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
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  $begingroup$
  Questions which seek a list of thoughts really don't fit the stack exchange model. You are right to realize that putting diverse loads in series is generally not workable outside of special cases given special consideration. When dropping 12v to 3.3v with a linear regulator, consider that this is only 22.5% efficient - if your load takes substantial current you will turn a lot of electricity into heat in the regulator.
  $endgroup$
  – Chris Stratton
  4 hours ago
  
  
  

  
  
  
  


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  $begingroup$
  Another issue would be if all circuits share a common ground or not.
  $endgroup$
  – DrMoishe Pippik
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The PC industry has dealt with this issue long ago and standardized on feedforward tightly coupled single regulators sharing a common transformer with regulation on the main 5V supply and tight cross-regulation , load specs. But what are your specs?
  $endgroup$
  – Sunnyskyguy EE75
  3 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  what wrong with having them in series to help spread the heat?
  $endgroup$
  – dandavis
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @dandavis, "what wrong with having them in series" - it depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient).
  $endgroup$
  – Ale..chenski
  2 hours ago
  

  
  
  
  

add a comment | 

3

$begingroup$

My project has components that operate at 3 different voltages (9, 5 and 3.3). I would like to only deal with one power source. Is it alright to feed one 12 V power source to 3 voltage regulators? Is there a smarter way of getting everything powered from a common source? I want to avoid placing the components in series.

power-supply voltage-regulator

share|improve this question

asked 4 hours ago

DanielPatrickDanielPatrick

161

New contributor

DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Questions which seek a list of thoughts really don't fit the stack exchange model. You are right to realize that putting diverse loads in series is generally not workable outside of special cases given special consideration. When dropping 12v to 3.3v with a linear regulator, consider that this is only 22.5% efficient - if your load takes substantial current you will turn a lot of electricity into heat in the regulator.
  $endgroup$
  – Chris Stratton
  4 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Another issue would be if all circuits share a common ground or not.
  $endgroup$
  – DrMoishe Pippik
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The PC industry has dealt with this issue long ago and standardized on feedforward tightly coupled single regulators sharing a common transformer with regulation on the main 5V supply and tight cross-regulation , load specs. But what are your specs?
  $endgroup$
  – Sunnyskyguy EE75
  3 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  what wrong with having them in series to help spread the heat?
  $endgroup$
  – dandavis
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @dandavis, "what wrong with having them in series" - it depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient).
  $endgroup$
  – Ale..chenski
  2 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

My project has components that operate at 3 different voltages (9, 5 and 3.3). I would like to only deal with one power source. Is it alright to feed one 12 V power source to 3 voltage regulators? Is there a smarter way of getting everything powered from a common source? I want to avoid placing the components in series.

power-supply voltage-regulator

share|improve this question

asked 4 hours ago

DanielPatrickDanielPatrick

161

New contributor

DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this question

asked 4 hours ago

DanielPatrickDanielPatrick

161

New contributor

DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 4 hours ago

DanielPatrickDanielPatrick

161

New contributor

DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 hours ago

DanielPatrickDanielPatrick

161

New contributor

DanielPatrick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 hours ago

DanielPatrickDanielPatrick

161

1 Answer
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oldest

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7

$begingroup$

The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:

Or Texas Instruments TPS65400:

Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:

This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.

Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.

Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.

share|improve this answer

edited 8 mins ago

answered 3 hours ago

Ale..chenskiAle..chenski

28.2k11866

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Great answer. Thanks!
  $endgroup$
  – Leroy105
  1 hour ago
  

  
  
  
  

add a comment | 

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7

$begingroup$

The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:

Or Texas Instruments TPS65400:

Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:

This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.

Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.

Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.

share|improve this answer

edited 8 mins ago

answered 3 hours ago

Ale..chenskiAle..chenski

28.2k11866

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Great answer. Thanks!
  $endgroup$
  – Leroy105
  1 hour ago
  

  
  
  
  

add a comment | 

7

$begingroup$

The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:

Or Texas Instruments TPS65400:

Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:

This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.

Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.

Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.

share|improve this answer

edited 8 mins ago

answered 3 hours ago

Ale..chenskiAle..chenski

28.2k11866

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Great answer. Thanks!
  $endgroup$
  – Leroy105
  1 hour ago
  

  
  
  
  

add a comment | 

$begingroup$

The problem of having multiple voltages to different parts of design has been solved by electronics industry with so-called multi-channel PMIC - Power management IC. Here is an example from Allegro A4490:

Or Texas Instruments TPS65400:

Here is an example (from my junk box) of how the power distribution block looks in reality (Proscan 4K 40" TV), using RT6914 PMIC:

This is a fairly common solution for many classes of devices: tablet/phones, TY-sets, set-top boxes, computer monitors, you name it. This is the standard technique.

Obviously a hybrid power topology is used, some regulators are in series, some are from parallel multi-channel PMIC. It should be remembered that the power-on and power-off sequencing usually has certain timing requirements, and a all-in-one single-IC PMIC has easier means to control the sequence.

Overall the topology of regulators depends on required amperage of each rail. If you need 9V@100mA and 3.3V@5A, it is uneconomical to make 9V@3A regulator before the 3.3V one (I assume switchers, even if smaller Vout/Vin ratio is somewhat more efficient). If you have a bunch of low-current consumers at low voltages while, say, the main power goes to 5V rail, then it is perfectly fine to have the other regulators fed from 5V rail. An example could be the "hybrid" power architecture of Intel ATOM SoC platform, Powering SoC.

share|improve this answer

edited 8 mins ago

answered 3 hours ago

Ale..chenskiAle..chenski

28.2k11866

$endgroup$

share|improve this answer

edited 8 mins ago

answered 3 hours ago

Ale..chenskiAle..chenski

28.2k11866

answered 3 hours ago

Ale..chenskiAle..chenski

28.2k11866

answered 3 hours ago

Ale..chenskiAle..chenski

28.2k11866