LM239DR Texas Instruments 开关稳压器 500mA SD Vtg Reg

1 Features 3 Description

1 The LM22674 switching regulator provides all of the • Wide Input Voltage Range: 4.5 V to 42 V

functions necessary to implement an efficient high

• Internally Compensated Voltage Mode Control voltage step-down (buck) regulator using a minimum

• Stable with Low ESR Ceramic Capacitors of external components. This easy to use regulator

• 200 mΩ N-Channel MOSFET incorporates a 42 V N-channel MOSFET switch

capable of providing up to 500 mA of load current.

• Output Voltage Options: Excellent line and load regulation along with high -ADJ (Outputs as Low as 1.285 V) efficiency (> 90%) are featured. Voltage mode control -5.0 (Output Fixed to 5 V) offers short minimum on-time, allowing the widest

• ±1.5% Feedback Reference Accuracy ratio between input and output voltages. Internal loop

• Switching Frequency of 500 kHz compensation means that the user is free from the

tedious task of calculating the loop compensation

• –40°C to 125°C Operating Junction Temperature components. Fixed 5 V output and adjustable output Range voltage options are available. A switching frequency

• Precision Enable Pin of 500 kHz allows for small external components and

good transient response. A precision enable input • Integrated Boot-Strap Diode

allows simplification of regulator control and system • Integrated Soft-Start

power sequencing. In shutdown mode the regulator

• Fully WEBENCH® Enabled draws only 25 μA (typ). Built in soft-start (500 μs, typ)

• LM22674-Q1 is an Automotive Grade Product saves external components. The LM22674 also has

that is AEC-Q100 Grade 1 Qualified (–40°C to built in thermal shutdown, and current limiting to

+125 protect against accidental overloads. °C Operating Junction Temperature)

• SO PowerPAD (Exposed Pad) The LM22674 device is a member of Texas

Instruments' SIMPLE SWITCHER®

family. The

SIMPLE SWITCHER®

2 Applications concept provides for an easy

to use complete design using a minimum number of

• Industrial Control external components and the TI WEBENCH® design

• Telecom and Datacom Systems tool. TI's WEBENCH®

tool includes features such as

external component calculation, electrical simulation, • Embedded Systems

thermal simulation, and Build-It boards for easy

• Conversions from Standard 24 V, 12 V and 5 V

design-in. Input Rails