LM22672 - 具有可调频率的 1A SIMPLE SWITCHER? 降压稳压器

LM22672是TI德州仪器公司的一款转换器（集成开关）产品，LM22672是具有可调频率的 1A SIMPLE SWITCHER? 降压稳压器，本站介绍了LM22672的封装应用图解、特点和优点、功能等，并给出了与LM22672相关的TI元器件型号供参考。

LM22672 - 具有可调频率的 1A SIMPLE SWITCHER? 降压稳压器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品特性

Wide Input Voltage Range: 4.5 V to 42 V
Internally Compensated Voltage Mode Control
Stable with Low ESR Ceramic Capacitors
200 mΩ N-Channel MOSFET
Output Voltage Options: -ADJ (Outputs as Low as 1.285 V) -5.0 (Output Fixed to 5 V)
±1.5% Feedback Reference Accuracy
500 kHz Default Switching Frequency
Adjustable Switching Frequency and Synchronization
–40°C to 125°C Junction Temperature Range
Precision Enable Input
Integrated Boot-Strap Diode
Adjustable Soft-Start
Fully WEBENCH® Enabled
LM22672-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (–40°C to +125°C Junction Temperature)
SO PowerPAD (Exposed Pad)

产品应用

Industrial Control
Telecom and Datacom Systems
Embedded Systems
Conversions from Standard 24 V, 12 V and 5 V Input Rails

Simplified Application Schematic

产品说明

The LM22672 switching regulator provides all of the functions necessary to implement an efficient high voltage step-down (buck) regulator using a minimum of external components. This easy to use regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 1 A of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available.

The default switching frequency is set at 500 kHz allowing for small external components and good transient response. In addition, the frequency can be adjusted over a range of 200 kHz to 1 MHz with a single external resistor. The internal oscillator can be synchronized to a system clock or to the oscillator of another regulator. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typ). An adjustable soft-start feature is provided through the selection of a single external capacitor. The LM22672 also has built in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22672 is a member of Texas Instruments' SIMPLE SWITCHER® family. The SIMPLE SWITCHER® concept provides for an easy to use complete design using a minimum number of external components and the TI WEBENCH® design tool. TI's WEBENCH® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM22672, LM22672-Q1	HSOP (8)	4.89 mm x 3.90 mm

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