VIN

PGND

12 V

VOUT

VS+

1.02 kO

1.0 V

VADJ

PGOOD

VG

AGND

10 kO

5V

TPSM84A21

Copyright © 2016, Texas Instruments Incorporated

16

TPSM84A21

SLVSDF7A – DECEMBER 2016 – REVISED JULY 2017

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Product Folder Links: TPSM84A21

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Copyright © 2016–2017, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TPSM84A21 is a synchronous series capacitor step down DC-DC power module. It is used to convert a

higher DC voltage to a lower DC voltage with a maximum output current of 10 A. The following design

procedure can be used to select components for the TPSM84A21. Alternately, the WEBENCH® software

may be used to generate complete designs. When generating a design, the WEBENCH software utilizes an

iterative design procedure and accesses comprehensive databases of components. Please visit

www.ti.com/webench for more details.

8.2 Typical Application

The TPSM84A21 includes both input and output capacitors internal to the device, therefore it only requires a

voltage setting resistor and possibly a pull-up resistor on the PGOOD pin in most applications. Figure 17 shows a

typical TPSM84A21 schematic with only the minimum required components.

Figure 17. Typical Application Schematic

8.2.1 Design Requirements

For this design example, use the parameters listed in Table 3 and follow the design procedures below.

Table 3. Design Parameters

DESIGN PARAMETER

VALUE

Input Voltage VIN

12 V typical

Output Voltage VOUT

1.0 V

Output Current Rating

10 A

Key care-abouts

Tight transient response, small footprint, high efficiency, PGOOD signal

Transient Response Requirements

±2% voltage deviation, 5 A load step, 5 A/µs slew rate