LM22671MRX-5.0/NOPB

The LM22671 switching regulator uses a minimal number of external components to provide all the functions needed to implement a high-efficiency, high-voltage step-down regulator. This easy-to-use regulator integrates a 42V N-channel MOSFET switch capable of delivering up to 500 mA of load current, with excellent line and load regulation and high efficiency (>90%). Voltage-mode control provides a short minimum on-time, enabling the widest input-to-output voltage ratio. Internal loop compensation eliminates the tedious task of calculating loop compensation components. The regulator is available in both a fixed 5V output and an adjustable output voltage option. The default switching frequency is set at 500 kHz, allowing the use of small external components while providing good transient response. The frequency can also be adjusted over a range of 200 kHz to 1 MHz using 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 optimized regulator control and system power sequencing. In shutdown mode, the regulator quiescent current is only 25 μA (typical). Adjustable soft-start is available by selecting a single external capacitor. The LM22671 also incorporates thermal shutdown and current limiting to protect the device against accidental overload.

Applications

• Industrial control
• Telecom and datacom systems
• Embedded systems
• Conversion from 24V, 12V, and 5V standard input power rails

Key features

• Wide input voltage range: 4.5V to 42V
• Internal compensation voltage mode control
• Stable with low ESR ceramic capacitors
• 200mΩ N-channel MOSFET
• Output voltage options:
• ADJ (minimum output voltage 1.285V)
• 5.0 (fixed output voltage 5V)
• ±1.5% feedback reference accuracy
• Default switching frequency 500kHz
• Adjustable switching frequency and synchronization
• Operating junction temperature range: -40°C to 125°C
• Precision enable pin
• Integrated bootstrap diode
• Adjustable soft-start
• Full WEBENCH enabled
• LM22671-Q1 is an automotive-grade product compliant with AEC-Q100 Grade 1 (operating junction temperature range -40°C to +125°C)
• Small outline (SO) PowerPAD (exposed pad)