LM2853-1.2EVAL National Semiconductor, LM2853-1.2EVAL Datasheet

LM2853-1.2EVAL

Manufacturer Part Number

LM2853-1.2EVAL

Description

BOARD EVAL LM2853-1.2

Manufacturer

National Semiconductor

Series

PowerWise®, SIMPLE SWITCHER®r

Datasheets

1.LM2853MH-3.3NOPB.pdf (12 pages)

2.LM2853-1.2EVAL.pdf (4 pages)

Specifications of LM2853-1.2EVAL

Main Purpose

DC/DC, Step Down

Outputs And Type

1, Non-Isolated

Voltage - Output

1.2V

Current - Output

Voltage - Input

3 ~ 5.5V

Regulator Topology

Buck

Frequency - Switching

550kHz

Board Type

Fully Populated

Utilized Ic / Part

LM2853

Lead Free Status / RoHS Status

Not applicable / Not applicable

Power - Output

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LM2853 Evaluation Board

Introduction

The LM2853 synchronous SIMPLE SWITCHER

lator is a synchronous switching regulator capable of deliv-

ering up to 3A of current into a load. The LM2853 represents

the ultimate in ease of use, as internal type-3 compensation

minimizes the necessary external components and eases

the selection of those components. The LM2853 is capable

of accepting an input voltage between 3.0V and 5.5V and

delivering an output voltage that is factory programmable

from 0.8V to 3.3V in 100mV increments. The nominal switch-

ing frequency of the LM2853 is 550 kHz.

The LM2853 Evaluation Board was designed to accommo-

date three standard output voltage options (1.2V/1.8V/3.3V)

Schematic

Bill Of Material

BYP

GRM31CR60J476ME19

GRM21BR71C105KA01

LM2853MH-x.x/NOPB

TPSD227X06R0050

VJ0805Y222KXXA

DO3316P-472

Part Number

AN202018

Capacitor

3A Buck

Inductor

Type

buck regu-

ETSSOP-14

DO3316P

D Case

1206

0805

0603

Size

National Semiconductor

Application Note 1513

Jeff Kissinger

October 2006

using the same layout and external components. Just five

external components are included on the board, and the

entire 3A power supply occupies a minimum amount of

space (1.2” by 0.82”) on a two layer PCB without sacrificing

efficiency or performance. The input voltage can be varied

over the entire operating range of the LM2853 (3.0V to 5.5V)

for testing purposes. Also, the board is designed to be stable

with all standard LM2853 voltage options, so if another

voltage option needs to be tested, the LM2853 IC can be

removed and replaced with the desired option.

Parameters

(50 mΩ)

220 µF

4.7 µH

2.2 nF

47 µF

1 µF

x.xV

QTY

20201803

Vishay-Vitramon

Vishay-Sprague

Coilcraft

Vendor

Murata

www.national.com

NSC

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LM2853-1.2EVAL Summary of contents

Page 1

... Introduction The LM2853 synchronous SIMPLE SWITCHER lator is a synchronous switching regulator capable of deliv- ering current into a load. The LM2853 represents the ultimate in ease of use, as internal type-3 compensation minimizes the necessary external components and eases the selection of those components. The LM2853 is capable of accepting an input voltage between 3 ...

Page 2

... RMS 450 kΩ = 2.97 ms ≈ RMS soft-start time will allow the LM2853 to start up gracefully without triggering over-current protection, regard- less of the operating conditions 1.8V) rating in a small RMS RMS to GND ...

Page 3

... LM2853. Also, in order to help conduct heat to the ground plane and away from the LM2853, an array of vias is used to connect the exposed pad to the ground plane, instead of a single via. Finally, the sense pin trace is inten- tionally routed away from the SW node to minimize any EMI pickup ...

Page 4

... National Semiconductor and the National Semiconductor logo are trademarks or registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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