TPS61088: Reducing output current when device is in shutdown

Derek

Part Number: TPS61088

Hello, my application is boosting the voltage from 3 'C' cells to 6V to run a motor. Nominal motor current is 200mA but can be as high as 1A when it's close to stalling.

I'm currently using the TPS61088 but I discovered that even when the device is in shutdown it's still outputting ~4V due to an internal diode.

Looks like the only way to cut this current is to use a 2A load switch on the input, right?

Do you have another boost converter that will turn off the output completely? This is important for battery life.

Thanks,

Derek

over 6 years ago

0 Helen chen over 6 years ago

TI__Mastermind 40080 points

Dear Derek,

Please specify your Vin range? And the Vout is 6V, right?

0 Derek over 6 years ago in reply to Helen chen

Mastermind 9792 points

Vin is 3.3V to 4.5V. Vout is 6V, yes.

0 Helen chen over 6 years ago in reply to Derek

TI__Mastermind 40080 points

Dear Sir,

For the TPS61088, the input is connected to the output side through the upper side FET body diode even it is in the shutdown mode. So yes, you can add a load switch to disconnect it with the load.

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TPS61088: Reducing output current when device is in shutdown