LM706A0-Q1: IBB Configuration for BUCK only IC

Hi David,

DAVID SABALESKY said:

I would like to know if you can use the LM706A0-Q1RRX IC, buck, for an inverting configuration?

Yes, it can be used in an IBB configuration.

DAVID SABALESKY said:

Please refer any application notes for this IC that are relative to the IBB or just Inverting configuration.

At the moment, there are no IBB related application notes for the LM706A0-Q1.

DAVID SABALESKY said:

Normally most BUCK-BOOST ICs are capable of IBB.

Yes, I agree.

Ben

Hello Ben,

Thank you for the prompt response. I would like to use two of these ICs. One for +Vrail and the other for -Vrail. 

I am converting +24 to +/-15V. Currently TI has limited supply of TPSM and TLVM series DC/DC modules.

We are looking at using +10K units and it is frustrating not being able to get stock.

The LM70xxx series ICs are readily available, and we have to do an alternate PCB layout due to shortages.

Due to the large input voltage (65V), I believe there are no issues with overvoltage. Vin (IBB) = 24+ abs|-15| = 39V.

There is plenty of headroom for the IBB configuration.

If you see any issue, please relate them to me. I am currently in design processes. 

We have been using Vishay SIC466 for IBB, and I am going to propose using the LM706A0-Q1 IC instead.

Preliminary evaluation suggests that the TI part has better performance characteristics.

Your support is greatly appreciated.

Sincerely,

David

Hi David,

What is max load current for both rails? Have you reached out to your local TI rep to rectify the issue of not getting the modules?

Ben

Hi Ben,

I have not reached out, but if you have a contact, I will call him immediately.

We use 1x TPSM63610RDFR (+15V rail), 1x TLVM13610RDFR (+5V rail), and 3x TLVM13640RDLR (+5V, +3.3V, +1.2V rails) for each pcb.

Again, we are looking at production in +10K units.

The max load on the +/-15V rails is 6A. 

If you have any other possible solutions, I would be grateful for the insight.

Currently, the -15V uses Vishay Sic466 and the +15V rail uses a TPSM63610RDFR.

Due to global shortage the TLVM13610RDFR (+5V rail) was swapped out for a TPSM86838RCGR.

The TPSM86838RCGR has limited range of options, that is from what I have gathered upon comparing the two devices.

Non the less it has to be used to do limited or no global supply.

I do not like redesigns due to global shortages.

Thank you,

David

Hi David,

I understand your situation. Where are you located? 

Ben

Atlanta, GA

HI David,

What is the name of your company?

Ben

Hi David,

I have contacted our internal product marketing engineer and he will dispatch a sales contact to work with you on getting the modules you need. 

Let me know if you have any other questions. If there are no further questions, please close the thread by clicking on "resolved". Thanks and good luck to you.

Ben

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