TPS82085

2.5V to 6V

R1

80.6k

R2

162k

V

IN

POWER GOOD

VOUT

FB

VIN

GND

EN

PG

C2

22µF

R3

499k

V

OUT

1.2V/3A

C1

10µF

TPS82085

SLVSCN4B – OCTOBER 2014 – REVISED AUGUST 2015

www.ti.com

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 TPS82085 is a synchronous step-down converter power module whose output voltage is adjusted by

component selection. The following section discusses the design of the external components to complete the

power supply design for several input and output voltage options by using typical applications as a reference.

8.2 Typical Applications

8.2.1

1.2-V Output Application

Figure 4. 1.2-V Output Application

8.2.1.1 Design Requirements

For this design example, use the input parameters shown in Table 1.

Table 1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Input voltage range

2.5 V to 6 V

Output voltage

1.2 V

Output ripple voltage

< 20 mV

Output current rating

3 A

Table 2 lists the components used for the example.

Table 2. List of Components

REFERENCE

DESCRIPTION

MANUFACTURER

C1

10µF, Ceramic Capacitor, 10V, X7R, size 0805, GRM21BR71A106KE51

Murata

22µF, Ceramic Capacitor, 6.3V, X7R, size 0805, CL21B226MQQNNNE

Samsung

C2

or

or

22µF, Ceramic Capacitor, 6.3V, X7S, size 0805, C2012X7S1A226M125AC

TDK

R1

Depending on the output voltage, 1% accuracy

Std

R2

162k

Ω, 1% accuracy

Std

R3

499k

Ω, 1% accuracy

Std

10

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