LM2746MXA

• The power stage input voltage ranges from 1V to 16V
• The input voltage of the control stage is from 3V to 5.5V
• The output voltage can be adjusted as low as 0.6V
• Power well marked and shut down
• Outputs overvoltage and undervoltage detection
• ± 1% feedback voltage accuracy with temperature
• Low-side adjustable current sensing
• Adjustable soft start
• Tracking and sequencing of shutdown and soft-start pins
• Switching frequency from 50 kHz to 1 megahertz
• Bare pads TSSOP - 14 package

illustrate

The LM2746 is a high-speed synchronous step-down regulator controller with a feedback voltage accuracy ± 1%. It can provide simple downconversion output voltages as low as 0.6V. Although the control section of the IC is rated for 3 to 5.5V, the drive section is designed to accept input rails up to 16V. The use of non-overlapping MOSFET gate drivers helps avoid potential pass-through issues while maintaining high efficiency. ICs are designed to be a more cost-effective option with only N-channel MOSFETs driving high-side and low-side positions. Detection provides a simple, adjustable current limiting voltage drop for low-side switches.

The fixed frequency voltage mode PWM control structure is adjustable with an external resistor from 50 kHz to 1 MHz. This wide range of switching frequencies gives flexibility in power supply design with better trade-offs between component size, cost, and efficiency.

Features include soft start, input undervoltage lockout (UVLO), and good power supply (based on undervoltage and overvoltage detection). In addition, the IC's shutdown pin can be used to provide a start-up delay, and a soft-start pin can be used to perform precise tracking with external rail sequencing purposes.

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• Cable modems, DSL, and ADSL
• Laser printers and inkjet printers
• Low voltage power module
• DSP, ASIC core and I/O