low Quiescent Current 12v boost dc to dc converter regulator

ashok b

Intellectual 440 points

Other Parts Discussed in Thread: TPS61089, LM5155, TPS61088

HI,

we are developing Li-ion battery operated device for the we need boost dc-dc converter with below specification:

1) input voltage: 3v to 5v

2) output voltage 10v@0.5A(max)

3) output voltage 12v@1A(max)

4) With low Quiescent Current less then 1mA.

Please suggest me the any part number suitable to above specifications.

Thanks,

Ashok

over 5 years ago

0 Jasper Li over 5 years ago

TI__Mastermind 46905 points

Hi Ashok,

i would suggest TPS61089

0 Helen chen over 5 years ago

TI__Mastermind 40080 points

Dear Sir,

As what jasper mentioned, TPS61089 is just fit for this application.

Any more questions?

0 ashok b over 5 years ago in reply to Jasper Li

Intellectual 440 points

HI,

Can i Get below specification Boost regulator

1) input voltage: 3v to 5v

2) output voltage 12v@3A(max)

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Dear Sir,

12V/3A is a big output power. Is the 3A a pulsed current? if it is a pulsed short duration current , then TPS61088 is fit for the application. Or you have to use a controller like LM5155.

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi ,

Thanks for your time.

Our design continuous load consumption is 12@2A. So we are decided to use TPS61088RHLR .

Vin : 3.7-4.3V@4Ah lithium polymer Battery.

Vout :12V@2A

is it support for 12V@2A continuous load consumption.

Below attached Block diagram.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Dear Sir,

You can use TPS61088 in your design, thanks!

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi Helen chen,

Thanks for your time and continuous support,

We designed TPS61088 circuit on single layer board.

Is it ok to use Please confirm.

does it affect on any performance issue ?

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Dear Sir,

12V/2A is a big output power, suggest you use a 4 layer board during the layout, or the IC will be very hot and the efficiency will be low.

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi Helen,

Thanks for your time and continuous support.

Can I get any document saying that 4 layers are required.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Hi Ashok,

No, we don't have the document. The EVM board is designed by me, we test the thermal of the two-layer board and the four layer board before. So this is an experience.

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi Helen,

We testing TPS61088RHLR Custom single layer board.We design board For 12@2A. ouput

Input Voltage: 4V@2A

Output Voltage : 12@2A

Before connecting load i am getting 12V. when i connect led load the regulator going bad (damage).

Please suggest me any solution.

Below attached our block diagram and schematics.

Thanks,

Ashok

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

HI Helen,

We are testing TPS61088RHLR custom single layer board.before connecting load i am getting 12V at the output.

when i connect the load the ic going bad(damage)

Below attached our schematics and block diagram.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

What is input 4V/2A mean?

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Input voltage and current to the TPS61088

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Dear Sir,

If the load power is 12V/2A, then the input power at least 12*2/0.88=27.27 W. so if input volatge is 4V, then input current need to be 27.27/4=6.818A . So the 2A is not enough.

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi,

Without connecting any load the ic going bad. when i test the damaged ic the ic SW pins are showing short.

Please confirm our schematics correct or wrong and also inductor value.

Let me know any changes need to be done in schematics.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Dear Sir,

Here comes the review result:

1. R25 change to 200kohm since you choose a very small value 1uH inductor;

2. the compensation network need to change to R23=5k, C2=10nF;

3. please share the inductor spec to us?

Thanks!

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi Sir,

Please find the inductor details below

part number : SPM6530T-1R0M120

Maximum DC Current : 14.1 A

Maximum DC Resistance : 7.81 mOhms

Please let me know if any changes in schematics

and also suggest me the inductor value.

Its urgent.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

The inductor should be OK. So please change the compensation network and change the frequency setting resistor as what I recommended before..

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi ,

I made changes as you suggested.now we are getting 12V output without load.

When i connect 12V@ 0.3A load We are getting output 5V

Please suggest me why it is working like that.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Dear Sir,

Please check whether R19 is well soldered? And what is the behavior when Io=0.1A, 0.2A?

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi Helen,

I checked R19 soldered well.

For Io=0.1A and 0.2A working fine we checked almost 1 hour.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Thanks for the update!

Did you guard the input current?

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi,

our supply support upto 3.7-5V@5A of current.

When i connect 12V@0.3A load output voltage reduces from 12V To 5V.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Hi Ashok,

Please check whether the Ilim pin is well soldered. You can check in this way: check whether there's a diode between the GND and the Ilim pin.If the diode exists, then the IC is well soldered. If not, then u need to resolder the IC.

Another point is: please check the on board input voltage, if the trace is thin and long, then the on board voltage will be low.

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi Helen,

Below attached the ILIM voltages between GND and ILIM pin.

Also the on-board input voltage, I am observing drop of 0.7V (input voltage-3.7V, Observed- 3.0V) when load is connected.

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Dear Sir,

The connection is OK, please move forward!

0 Helen chen over 5 years ago in reply to Helen chen

TI__Mastermind 40080 points

The input voltage drop is really big. The 0.7V drop is tested at 0.2A load current? I wonder when the load current is bigger, then voltage drop will be even higher, which will trigger UVP.

By the way, could you please share the pcb layout with us?

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi Helen,

Please find the attached .brd layout file .

Thanks,

AshokTPS61088.brd

0 ashok b over 5 years ago in reply to ashok b

Intellectual 440 points

Hi Helen,

Are u able to open the .brd file.or shall i send the Pdf file or image.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Dear Sir,

I checked the layout file just now, the layout is pretty good.

I noticed you use a small Vcc cap, did you guard the voltage across the Vcc wehn Io=0.2A;

Did you check whether the Boot pin is well soldered (check the ESD diode anti-paralled with the GND);

What is the inductor datasheet? what is the current rating of the inductor?

0 ashok b over 5 years ago in reply to Helen chen

Intellectual 440 points

Hi Helen,

Please find the answers inline

I checked the layout file just now, the layout is pretty good.

Ans: Thank you for your time

I noticed you use a small Vcc cap, did you guard the voltage across the Vcc wehn Io=0.2A;

Ans: Yeah i checked for 0.2A Input and output voltage not fluctuating.

Did you check whether the Boot pin is well soldered (check the ESD diode anti-paralled with the GND);

Ans : Yeah well soldered

What is the inductor datasheet? what is the current rating of the inductor?

Ans : Inductor in datasheet 2.2uH but i used 1uH from ti web bench i got the value.

Thanks,

Ashok

0 Helen chen over 5 years ago in reply to ashok b

TI__Mastermind 40080 points

Hi Ashok,

Thanks for the update!

Could you attach the datasheet of this 1uH cap? And by the way, please check the value of R19 on board, is it 105k ohm?

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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low Quiescent Current 12v boost dc to dc converter regulator