p

´

´

´

ff

1

1

C

=

2

R

25 kHz

f

p

´

´

´

z

1

ff

1

=

= 25 kHz

2

R

C

1

OUT

REF

2

R

V

V

1

R

æ

ö

=

´

+

ç

÷

è

ø

TLV62065

V

= 1.8 V

up to 2 A

OUT

R

360 k

1

Ω

R

180 k

2

Ω

V

= 2.9 V to 5.5 V

IN

C

10

OUT

µ

F

C

10

IN

µ

F

PVIN

AVIN

EN

MODE

AGND

PGND

SW

FB

C

22 pF

ff

L

1.0 H

m

TLV62065

www.ti.com

SLVSAC4B – NOVEMBER 2010 – REVISED DECEMBER 2015

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 TLV62065 is a high-efficiency synchronous step-down DC/DC converter providing up to 2-A output current.

8.2 Typical Application

Figure 8. TLV62065 1.8-V Adjustable Output Voltage Configuration

8.2.1 Design Requirements

The device operates over an input voltage range from 2.9 V to 5.5 V. The output voltage is adjustable using an

external feedback divider.

8.2.2 Detailed Design Procedure

8.2.2.1 Output Voltage Setting

The output voltage can be calculated by Equation 2 with an internal reference voltage VREF typically 0.6 V.

(2)

To minimize the current through the feedback divider network, R2 should be within the range of 120 kΩ to 360

k

Ω. The sum of R1 and R2 should not exceed approximately 1 MΩ, to keep the network robust against noise. An

external feed-forward capacitor Cff is required for optimum regulation performance. Lower resistor values can be

used. R1 and Cff places a zero in the loop. The right value for Cff can be calculated by Equation 3 and

Equation 4:

(3)

(4)

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