LM22677QTJ-ADJ/NOPB

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 42-V N-channel MOSFET switch that can provide up to 5 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, thus 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 (typical). The LM22677 also has built-in thermal shutdown, and current limiting to protect against accidental overloads.

Applications

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

Key features

• Wide Input Voltage Range: 4.5 V to 42 V
• Internally Compensated Voltage Mode Control Stable With Low ESR Ceramic Capacitors
• 100 mΩ N-Channel MOSFET
• Output Voltage Options:
• -ADJ (Outputs as Low as 1.285 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 Operating Junction Temperature Range
• Precision Enable Input
• 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)
• NDR (Exposed Pad)