5 V to 1.2 V

2.2 μH, 2.2 MHz

1st L-C Only

Figure 8-8. Efficiency vs Load Current

5 V to 1.8 V

2.2 μH, 2.2 MHz

1st L-C Only

Figure 8-9. Efficiency vs Load Current

12 V to 1.2 V

2.2 μH, 1 MHz

1st L-C Only

Figure 8-10. Output Voltage vs Load Current

9 Power Supply Recommendations

The power supply to the TPS6291x needs to have a current rating according to the supply voltage, output

voltage, and output current of the TPS6291x.

10 Layout

10.1 Layout Guidelines

A proper layout is critical for the operation of any switched mode power supply, especially at high switching

frequencies. Therefore, the PCB layout of the TPS6291x demands careful attention to ensure best performance.

A poor layout can lead to issues like bad line and load regulation, instability, increased EMI radiation, and noise

sensitivity. Refer to the Five Steps to a Great PCB Layout for a Step-Down Converter Technical Brief for a

detailed discussion of general best practices. Specific recommendations for the device are listed below.

• The input capacitor or capacitors should be placed as close as possible to the VIN and PGND pins of the

device. This is the most critical component placement. Route the input capacitors directly to the VIN and

PGND pins avoiding vias.

• Place the inductor close to the SW pin. Minimize the copper area at the switch node.

• Place the output capacitor ground close to the PGND pin and route it directly avoiding vias. Minimize the

length of the connection from the inductor to the output capacitor.

www.ti.com

TPS62912, TPS62913

SLVSFP4 – AUGUST 2020

Copyright © 2020 Texas Instruments Incorporated

Submit Document Feedback

27

Product Folder Links: TPS62912 TPS62913