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LM2611: I need differential 5.6V and 3.3V LDO designs.

User4699
Prodigy 50 points
Part Number: LM2611

Tool/software:

Dear Expert
I need various output voltages from a single input supply in my ADC-DAC design. This can be done with different products and designs.

I kindly ask you to help me which products and designs to use in terms of price performance.
Input Voltage: It is Min.+12VDC and Max.+30VDC.
Output Voltages that i need;
V1: +3.3VDC @ 1,5A as Main system supply.
V2: +5.6VDC @500mA as Opamp and IC feed.(should not exceed 6V)
V3: -5.6VDC @500mA as Negative - Opamp feed.
I appriciated if you feedback with your valuable comments and suggestions.
Best Regards
Volkan

  • 0
    TI__Mastermind 27115 points

    Hi Volkan,

    Do you require fixed switching freq at light load condition?

  • 0 in reply to Andy Chen
    Prodigy 50 points

    Hello Andy, greetings from Istanbul.  First of all Thank you for your response.

    Andy Chen said:
    Do you require fixed switching freq at light load condition?

    Yes you are right.
    Your valuable opinions and suggestions are important to me. I would like to share some of my scenarios that pass through my mind may be as follows..
    Assuming the Input Voltage is in the range of 12-24v,
    Scenario 1;
    First; + 24VDC > Adjustable stepdown converter Topology with right components > +5.6V DC at 1.2A at max. load condition
    Second; +5.6V DC > LDO > +3.3V DC 1.2A at max. load condition
    Third;  +5.6V DC > Inverting Buck-Boost Topology > -5.6V DC 0.5A at max load condition

    Scenario2;
    First; + 24VDC > Adjustable stepdown converter Topology with right components > +3.3V DC at 2A
    Second; +3.3V DC > Sepic Topology > +5.6V DC 0.5A and negative supply.
    But at this point negative supply will reduced abouth -4.9V due to Reserve diode.

    I am stuck at Inverting Buck-Boost, sepic and cuk converter topologies:((

    Could you please guide me with the right design with the right products at the simplest and most effective way ?
    Thank you very much.  
    Volkan

  • 0 in reply to User4699
    Prodigy 50 points

    Andy,

    Output voltages can be designed as +-5.5V with the same information as above.
    Best Regards
    Volkan