Looking for power...

Hello, 

We're looking for power solution for one of our video oriented projects.

This device is powered from +12V battery or from +5V USB (used for software updates and configuration, video section is not powered)

We need +5V for CAN transceivers, +3.3V and +1.8V for all other devices (video processor, ADV7125 DAC, main MCU).

Actually we're using :

2x step down +5V regulators (LM2574) - one for main MCU, second for video section - powered down in deep sleep mode

2x 3.3V LDO regulators (digital, the estimated power consumption is 170mA and 300mA max)

2x 1.8V LDO regulators (digital and analog, the estimated power consumption is 200mA and 250mA max)

Now we need to add an ADV7611 HDMI receiver and USB charging circuit to produce +5V 1.2A max so we can't keep the existing design.

We're looking for a compact (small inductors and capacitors) solution, any advice is welcome

Thank you!

Parents
  • 0
    •  Analog Employees 
    on Aug 6, 2012 9:37 PM

    Dim,

    let's start with the LDOs, which I assume you are running them from the 5V rail.

    You could consider the ADP222 (dual 300mA) or the ADP323 (tripple 200mA).

    The Linear Regulator design tool will help you with determine if these devices will handle the power dissipation (depending on your ambient temperature), most of the time we recommend dropping some voltage external with a resistor (the tool will help you with that).

    Also the ADP323 can be used with 2 of the rails paralleled to give you a 200mA and a 400mA output (the tool will also handle that. Here is the link:

    Linear Regulator Parametric Search and Multi-Rail Design Tool http://download.analog.com/PMP/ADI_LinearRegulators.zip

    For generating the 5V I assume you still want to generate 2 separate rails?

    The ADP2323 may be a good option for you. This device has integrated high side FETs and use external low side FET. Since it is a dual channel you can use a dual low side FETs (one for each channel)

    Again here is the tool that can help you with the design (BOM optimization, Schematics, Performance data, etc) you just need to replace the 2 single FETs with an equivalent dual.

    ADP232x Buck Regulator Design Tool v. 4.5 (ADP2323, ADP2325)

    If you interested in other option, you can identify what parts may meet your needs using ADIsimPower

    www.analog.com/ADIsimPower

    and download the appropriate tool.

    LucaV

Reply
  • 0
    •  Analog Employees 
    on Aug 6, 2012 9:37 PM

    Dim,

    let's start with the LDOs, which I assume you are running them from the 5V rail.

    You could consider the ADP222 (dual 300mA) or the ADP323 (tripple 200mA).

    The Linear Regulator design tool will help you with determine if these devices will handle the power dissipation (depending on your ambient temperature), most of the time we recommend dropping some voltage external with a resistor (the tool will help you with that).

    Also the ADP323 can be used with 2 of the rails paralleled to give you a 200mA and a 400mA output (the tool will also handle that. Here is the link:

    Linear Regulator Parametric Search and Multi-Rail Design Tool http://download.analog.com/PMP/ADI_LinearRegulators.zip

    For generating the 5V I assume you still want to generate 2 separate rails?

    The ADP2323 may be a good option for you. This device has integrated high side FETs and use external low side FET. Since it is a dual channel you can use a dual low side FETs (one for each channel)

    Again here is the tool that can help you with the design (BOM optimization, Schematics, Performance data, etc) you just need to replace the 2 single FETs with an equivalent dual.

    ADP232x Buck Regulator Design Tool v. 4.5 (ADP2323, ADP2325)

    If you interested in other option, you can identify what parts may meet your needs using ADIsimPower

    www.analog.com/ADIsimPower

    and download the appropriate tool.

    LucaV

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