Texas Instruments LM22677

Description

The LM22677 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 5A 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 loopcompensation 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. A switching frequency of 500 kHz allows for small external components and good transient response. An adjustable soft-start feature is provided through the selection of a singleexternal capacitor. In addition, the switch current limit can be programmed with a single external resistor, allowing solution optimization. The LM22677 also has built in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22677 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.

Features

• Wide Input Voltage Range: 4.5V to 42V
• Internally Compensated Voltage Mode Control
• Stable with low ESR Ceramic Capacitors
• 100 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 Operating JunctionTemperature Range
• Precision Enable Pin
• Integrated Boot-Strap Diode
• Integrated Soft-Start
• Fully WEBENCH® enabled
• LM22677-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (-40°C to +125°C Operating Junction Temperature)
• PFM (Exposed Pad)

Typical applications

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

More information

• Datasheet
• IC product information