Texas Instruments LM22672

Description

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 42V N-channel MOSFET switch capable of providing up to 1A 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 5V 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 1MHz 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 ofregulator 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 omponent calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.

Features

• Wide Input Voltage Range: 4.5V to 42V
• Internally Compensated Voltage Mode Control
• Stable with Low ESR Ceramic Capacitors
• 200 mΩ N-Channel MOSFET
• Output Voltage Options:– ADJ (Outputs as Low as 1.285V)– 5.0 (Output Fixed to 5V)
• ±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)

Typical applications

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

More information

• Datasheet
• IC product information