Datasheet

V = 0.765 x

OUT

1 +

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TPS54528DDA

TPS54528

SLVSAY4C –JULY 2011–REVISED MARCH 2014

www.ti.com

9 Applications and Implementation

9.1 Application Information

The TPS54528 is designed to provide up to a 2-A output current from an input voltage source ranging from 4.5 V

to 18 V. The output voltage is configurable from 0.76 V to 6 V. A simplified design procedure for a 1.05-V output

is shown below .

9.2 Typical Application

Figure 12. 5-A Synchronous Step-Down (Buck) Converter

9.2.1 Design Requirements

Figure 12 shows the schematic of the design example.

To begin the design process, the user must know a few application parameters:

• Input voltage range

• Output voltage

• Output current

• Output voltage ripple

• Input voltage ripple

9.2.2 Detailed Design Procedure

9.2.2.1 Output Voltage Resistors Selection

The output voltage is set with a resistor divider from the output node to the VFB terminal. It is recommended to

use 1% tolerance or better divider resistors. Start by using Equation 3 to calculate V

OUT

To improve efficiency at light loads consider using larger value resistors, high resistance is more susceptible to

noise, and the voltage errors from the VFB input current are more noticeable.

(3)

Product Folder Links: TPS54528