LMR33620: LMR33620

user744376

Intellectual 420 points

Part Number: LMR33620

LMR33620

In my design the LMR33620 charge a SuperCapacitor bank thrug a shottky diode.

In order to have a precise voltage at the S-Caps the voltage divider sense the voltage directly across the S-Caps.

Question:

When ther is no voltage applied to the Vin pin of LMR33620 how many mA is allowed as backdrive into the FB pin of the IC ?

Jørgen

over 5 years ago

0 Andy Chen over 5 years ago

TI__Mastermind 34065 points

Hi Jorgen

FB pin is high impedance pin which only sink current below uA even DC voltage is applied on FB pin directly. Do NOT apply voltage over -03V~+5.5V range.

B R

Andy

0 user744376 over 5 years ago in reply to Andy Chen

Intellectual 420 points

Hi Andy,

Thank you for your promt reply.

See the attached: SLYA014A - May 2000 Latch-Up, ESD, and Other Phenomena

Please if possible contact the Chip Designer and let me know how many mA the that can be accepted into the the FB pin without this result in latch-up or degradation in the chip.

Jørgen

slya014a.pdf

0 Andy Chen over 5 years ago in reply to user744376

TI__Mastermind 34065 points

Hi Jorgen,

After checking with designer, the FB pin has no latch up issue no matter what VIN pin voltage is (0V--36V range). the FB sink current below uA even it's biased with DC power source directly.

B R

Andy

0 user744376 over 5 years ago in reply to Andy Chen

Intellectual 420 points

Hi Andy,

Thank you

case closed

Jørgen

Power management

Power management forum

LMR33620: LMR33620