TPS22966: I'd like to verify whether the 220-Ohm load is a resistor in the part tied between Vout and ground that is not shown in section 8.2, or is implemented another way (e.g., a high on-resistance FET).

David C

Part Number: TPS22966
Other Parts Discussed in Thread: TPS22918, TPS22976

Hello,

Section 3 of the data sheet on sheet 1 says "a 220-Ohm on-chip load resistor is added for quick output discharge when switch is turned off"

The Functional Block Diagram in section 8.2 shows FETs pulling Vout to ground, or connecting to Vin based on the ON input state.

I'd like to verify whether the 220-Ohm load is a resistor in the part tied between Vout and ground that is not shown in section 8.2, or is implemented another way (e.g., a high on-resistance FET).

Regards,

David

over 5 years ago

0 Alpha H over 5 years ago

TI__Genius 10855 points

Hi David,

Thanks for reaching out on E2E!

QOD is implemented in different ways depending on the load switch device.

The TPS22966 implements QOD using an internal resistor. This allows the device to maintain a constant RQOD pulldown resistance across input voltage, as you can see in Figure 10. For other devices, such as the TPS22918, the device uses a FET to maintain RQOD, and therefore has a higher RQOD at lower VIN voltages (as you can see in Figure 7 of the TPS22918 datasheet).

Let me know if you have any additional questions!

Thanks,

Arthur Huang

To find the latest information on Power Switches, visit www.ti.com/powerswitch

0 Alpha H over 5 years ago in reply to Alpha H

TI__Genius 10855 points

I also recommend switching to the TPS22976, which offers additional features compared to the TPS22966 including a larger VIN range, lower Ron, and thermal shutdown.

Thanks,
Arthur

Power management

Power management forum

TPS22966: I'd like to verify whether the 220-Ohm load is a resistor in the part tied between Vout and ground that is not shown in section 8.2, or is implemented another way (e.g., a high on-resistance FET).