REG1117屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由美國德州儀器公司制造生產(chǎn)的REG1117穩(wěn)壓器 - 線性線性穩(wěn)壓器用于提供穩(wěn)定的輸出電壓，無論負(fù)載電流、輸入電壓或環(huán)境因素如何變化，這些輸出電壓通常都要保持不變。它們的工作原理要求輸入電壓維持在高于所需的輸出電壓，而且要超出某個(gè)最小量，并且在工作時(shí)會將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對于大多數(shù)應(yīng)用而言，雖然這種穩(wěn)壓器的效率低于開關(guān)模式的穩(wěn)壓器，但它們通常更適合對噪聲高度敏感的應(yīng)用。

FEATURES

FIXED AND ADJUSTABLE VERSIONS

2.85V MODEL FOR SCSI-2 ACTIVE

TERMINATION

OUTPUT CURRENT:

REG1117: 800mA max

REG1117A: 1A max

OUTPUT TOLERANCE:
1% max

DROPOUT VOLTAGE:

REG1117: 1.2V max at IO = 800mA

REG1117A: 1.3V max at IO = 1A

INTERNAL CURRENT LIMIT

THERMAL OVERLOAD PROTECTION

SOT-223 AND DDPAK SURFACE-MOUNT

PACKAGES

APPLICATIONS

SCSI-2 ACTIVE TERMINATION

HAND-HELD DATA COLLECTION DEVICES

HIGH EFFICIENCY LINEAR REGULATORS

BATTERY-POWERED INSTRUMENTATION

BATTERY MANAGEMENT CIRCUITS FOR

NOTEBOOK AND PALMTOP PCs

CORE VOLTAGE SUPPLY: FPGA, PLD, DSP,

CPU

DESCRIPTION

The REG1117 is a family of easy-to-use three-terminal

voltage regulators. The family includes a variety of fixedand

adjustable-voltage versions, two currents (800mA and

1A) and two package types (SOT-223 and DDPAK). See

the chart below for available options.

Output voltage of the adjustable versions is set with two

external resistors. The REG1117 low dropout voltage

allows its use with as little as 1V input-output voltage

differential.

Laser trimming assures excellent output voltage accuracy

without adjustment. An NPN output stage allows output

stage drive to contribute to the load current for maximum

efficiency.