Datasheet > LM21212-2

LM21212-2

更新时间： 2024-11-09 11:33:59

品牌	Logo	应用领域
美国国家半导体 - NSC		/
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10页	1136K
描述
Evaluation Board provides a solution to examine the high efficiency

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LM21212-2 数据手册

National Semiconductor

Application Note 2140

Michael Hartshorne

May 11, 2011

LM21212-2 Evaluation

Board

The LM21212-2 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 over 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 LM21212-2 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 LM21212-2 buck switching regulator. The

LM21212-2 is capable of driving up to 12A of continuous load

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

internal reference. The LM21212-2 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 LM21212-2 has a

programmable switching frequency can be set between 300

kHz and 1.55 MHz with an external resistor. The dual function

soft-start/tracking pin can be used to control the startup re-

sponse of the LM21212-2, and the precision enable pin can

be used to easily sequence the LM21212-2 in applications

with sequencing requirements.

Evaluation Board Schematic

30157201

301572

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