- The power stage input voltage is from 1V to 16V
- The input voltage in the control phase is from 3V to 5.5V
- The output voltage can be adjusted down to 0.6V
- The power is well marked and turned off
- Output overvoltage and undervoltage detection
- ± 1% feedback voltage with temperature accuracy
- Low-side adjustable current sensing
- Adjustable soft-start
- Tracking and sequencing of shutdown and soft-start pins
- Switching frequency from 50 kHz to 1 MHz
- Bare pad TSSOP - 14 package
illustrate
The LM2746 is a high speed synchronous buck regulator controller with feedback voltage accuracy ± 1%. It provides a simple down-conversion output voltage as low as 0.6V. Although the control section of the IC is rated from 3 to 5.5V, the driver section is designed to accept input rails up to 16V. The use of non-overlapping MOSFET gate drivers helps avoid potential pass-through problems while maintaining high efficiency. ICs are designed as a more cost-effective option with only N-channel MOSFETs driving high-side and low-side positions. Sensing provides a simple, adjustable current to limit the voltage drop of the low-side switch.
The fixed-frequency voltage-mode PWM control structure is adjustable from 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 power good (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 implement accurate tracking with external rail sequencing purposes.
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- Cable modem, DSL and ADSL
- Laser printers and inkjet printers
- Low voltage power module
- DSP, ASIC core and I/O
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