TPS22965: Vbias and Vin ramp up/down sequence

Devendhiran Kumarasamy

Prodigy 130 points

Part Number: TPS22965
Other Parts Discussed in Thread: TPS22975,

In my design the power on sequence will be happen as given below.

1) Enable will be in logic low state

2) VIN (+3V3) will ramp first. Ramp up time would be 2mS

3) VBIAS (+5V) supply rail will also start to ramp along with VIN. But it has 4ms as Ramp up time.

Does this power on sequence will create any impact on the IC performance?

over 7 years ago

0 Alpha H over 7 years ago

TI__Genius 10855 points

Hi Devendhiran,

Thanks for reaching out. This power-on sequence will be acceptable, there isn't any coupling between VBIAS and VOUT that would cause an issue in this scenario as long as ENABLE is in a low state.

For new designs, I recommend that users switch over to the TPS22975. This device is pin-to-pin with the TPS22965, and offers thermal shutdown which isn't available on the 965.

Best regards,
Arthur Huang

0 Devendhiran Kumarasamy over 7 years ago in reply to Alpha H

Prodigy 130 points

Hi Arthur Huang,

Thanks for your reply.

Power management

Power management forum

TPS22965: Vbias and Vin ramp up/down sequence