TPS3851: Schematic Review

sonali zodage

Part Number: TPS3851

Tool/software:

Hello TI,

We are using TPS3851H33EDRBR for our application. Can you please review the attached schematic and let us know your valuable feedback.

CH4_MsoM_B.pdf

Thanks,

Sonali

1 month ago

0 Henry Naguski 1 month ago

TI__Intellectual 1320 points

Hi Sonali,

The AND gate on the output is not required, as TPS3851 has open-drain outputs. The RESET and WDO pins can be tied together and you can use a single pull-up resistor to achieve the same behavior as the AND gate. Additionally, the buffer you have on the input is not required and can be removed.

-Henry

0 sonali zodage 1 month ago in reply to Henry Naguski

Intellectual 365 points

Hello,

Thanks for your quick response.

Could you please confirm if the 120Ω resistor and 0.1μF capacitor on the MR pin are correct?
Also, do we need to add a TVS diode for SW2?

Thanks,

Sonali

0 Henry Naguski 1 month ago in reply to sonali zodage

TI__Intellectual 1320 points

Sonali,

The RC filter for debouncing the switch is not required, as the reset signal will be asserted for the reset timeout period (200ms in the case of TPS3851). See this application note for more information: Using The Manual Reset On Voltage Supervisors to Debounce a Pushbutton Switch

A TVS diode is not strictly required, but if the circuit is to be used in an ESD prone setting then it would help protect the device.

-Henry

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TPS3851: Schematic Review