Datasheet > LM21212-1

LM21212-1

更新时间： 2024-11-23 11:33:59

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
10页	1129K
描述
evaluation board provides a solution to examine the high efficiency

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LM21212-1 数据手册

National Semiconductor

Application Note 2107

Michael Hartshorne

March 21, 2011

LM21212-1 Evaluation

Board

The LM21212-1 evaluation board has been optimized to work

from 2.95V to 5.5V, achieving a balance between overall so-

lution size and regulator efficiency. The evaluation board

measures just under 2” x 2” on a four layer PCB, and exhibits

a junction-to-ambient thermal impedance (θ_JA) of 24°C/W

with no air flow. The power stage and compensation compo-

nents of the LM21212-1 evaluation board have been opti-

mized for an input voltage of 5V, but for testing purposes, the

input can be varied across the entire operating range. The

output voltage of the evaluation board is nominally 1.2V, but

this voltage can be easily changed to any voltage between

0.6V and V_INby modifying the feedback resistor network.

Introduction

This evaluation board provides a solution to examine the high

efficiency LM21212-1 buck switching regulator. The

LM21212-1 is capable of driving up to 12A of continuous load

current with excellent output voltage accuracy due to its ±1%

internal reference. This device also features a clock synchro-

nization input that allows the switching frequency to be syn-

chronized to an external clock source. The 300 kHz to 1.5

MHz frequency synchronization range enables the user to

minimize the power stage component size, while still allowing

for high efficiency. The LM21212-1 is capable of down con-

verting from an input voltage between 2.95V and 5.5V. Fault

protection features include current limit, output power good,

and output over-voltage protection. The dual function soft-

start/tracking pin can be used to control the startup response

of the LM21212-1, and the precision enable pin can be used

to easily sequence the LM21212-1 in applications with se-

quencing requirements.

Evaluation Board Schematic

30144801

301448

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