LM66100: LM66100: -80mV ~ 0.25V question

user5872838

Prodigy 90 points

Part Number: LM66100

We use LM66100 to compare BAT & 3.3V
Vin--BAT voltage (3.2V~2.7V)
CE--3.3V (3.135~3.465)

When BAT = 3.2V 3.3V = 3.135
This will encounter VCE-Vin <80mV Vin-VCE <250mV

May I ask if the IC is in DIODE mode (off) or MOS mode(on)?

thanks

over 5 years ago

0 Andy Robles over 5 years ago

TI__Genius 13760 points

Hi,

Welcome to E2E!

Welcome to E2E, a downside of the LM66100 is when voltages being applied on the VIN pin and CE pin are very close in value. I the state you mentioned the device could be either OFF or ON. We con only guarantee the ON or OFF state of the device once the difference in voltages exceed the thresholds described in the datasheet for VON or VOFF.

Best regards,

Andy Robles

0 user5872838 over 5 years ago in reply to Andy Robles

Prodigy 90 points

Thanks for your reply

0 user5872838 over 5 years ago in reply to Andy Robles

Prodigy 90 points

Dear Andy Robles

I have a question.

When no BAT at VIN, only 3.3V input.

Is it okay if VIN floats?

thanks

0 Andy Robles over 5 years ago in reply to user5872838

TI__Genius 13760 points

Hi,

Leaving pins floating is usually never a good idea. Since the behavior of the device is dependent on the voltage value at the VIN and CE pins we would not be able to guarantee its characteristics if the voltage is left floating.

Best regards,

Andy Robles

0 user5872838 over 5 years ago in reply to Andy Robles

Prodigy 90 points

Hi Andy Robles

The schematic is as above, can I remove the resistor inside the red circle ?

Best regards

Power management

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LM66100: LM66100: -80mV ~ 0.25V question