Datasheet > TC1267VET

TC1267VET

更新时间： 2024-11-21 22:19:59

品牌	Logo	应用领域
美国微芯 - MICROCHIP		调节器输出元件 PC
页数	文件大小	规格书
14页	491K
描述
400mA PCI LDO

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中文翻译

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数据手册

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TC1267VET 数据手册

TC1267

400mA PCI LDO

Features

General Description

• Glitch Free Transition Between Input Sources

• Automatic Input Source Selection

• External PMOS Bypass Switch Control

• Built-in 5V Detector

The TC1267 is an application-specific, low dropout

regulator (LDO), specifically intended for use in PCI

peripheral card applications complying with PCI Power

Management (PCI 2.0). It provides an uninterrupted,

3.3V output voltage when the main (5V) or auxiliary

(3.3V) input voltage supplies are present.

• 1% Regulated Output Voltage Accuracy

• 400mA Load Current Capability

• Kelvin Sense Input

The TC1267 consists of an LDO, a voltage threshold

detector, external switchover logic and gate drive

circuitry. It functions as a conventional LDO as long as

• Low Ground Current, Independent of Load

the voltage on the main supply input (V ) is above the

lower threshold (3.90V typical). Should the voltage on

Applications

fall below the lower threshold, the LDO is disabled

• PCMCIA

and an external P-channel MOSFET is automatically

turned on, connecting the auxiliary supply input to

• PCI

• Network Interface Cards (NICs)

• Cardbus^TMTechnology

• Desktop Computers

and ensuring an uninterrupted 3.3V output. The

OUT,

main supply is automatically selected, if both the main

and auxiliary input supplies are present, and transition

from one input supply to the other is ensured glitch-

free. High integration, automatic secondary supply

switchover, Kelvin sensing, and small size make the

TC1267 the optimum LDO for PCI 2.0 applications.

Device Selection Table

Junction

Temp. Range

Part Number

Package

Functional Block Diagram

TC1267VET

5-Pin DDPAK

-5°C to +95°C

Pin Configuration

5-Pin DDPAK

Detect

AUX

Tab is GND

Bandgap

Reference

TC1267

–

E/A

OUT

GND

2 3 4

2002 Microchip Technology Inc.

DS21378B-page 1

12 3 4 5 6 7...14

中文翻译

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