GND

FB

EN

VIN

SW

VIN = 5V

C1

R3

D1

L1

LM2830

R2

R1

C2

VO = 1.2V @ 1.0A

LM2830, LM2830-Q1

SNVS454E – AUGUST 2006 – REVISED DECEMBER 2014

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 device operates with input voltage in the range of 3.3 V to 5.5 V and provide regulated output voltage up to

1 A of continuous DC load. This device is optimized for high efficiency operation with minimum number of

external components. Also, high switching frequency allows use of small surface-mount components enabling

very small solution size. For component selection, see Detailed Design Procedure.

8.2 Typical Applications

8.2.1 LM2830X Design Vo = 1.2 V at 1.0A

Figure 19. LM2830X (1.6 MHz): Vin = 5 V, Vo = 1.2 V at 1.0-A Schematic

8.2.1.1 Design Requirements

This device must be able to operate at any voltage within input voltage range.

Load Current must be defined to properly size the inductor, input and output capacitors. Inductor should be able

to handle full expected load current as well as the peak current generated during load transients and start up.

Inrush current at startup will depend on the output capacitor selection. More details are provided in Detailed

Design Procedure.

Device has an enable (EN) pin that is used to enable and disable the device. This pin is active high and should

not be left floating in application.

8.2.1.2 Detailed Design Procedure

Table 1. Bill of Materials

PART ID

PART VALUE

MANUFACTURER

PART NUMBER

U1

1.0-A Buck Regulator

TI

LM2830X

C1, Input Cap

22 µF, 6.3 V, X5R

TDK

C3216X5ROJ226M

C2, Output Cap

22 µF, 6.3 V, X5R

TDK

C3216X5ROJ226M

D1, Catch Diode

0.3 Vf Schottky 1.5 A, 30 VR

TOSHIBA

CRS08

12

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