- Switching frequency from 50 kHz to 1 megahertz
- Switching frequency synchronization range 250 kHz to 1 MHz (LM2745 only)
- Start and pre-bias output loads
- The power stage input voltage is from 1V to 14V
- The input voltage of the control stage is from 3V to 6V
- The output voltage can be adjusted as low as 0.6V
- Power well marked and shut down
- Outputs overvoltage and undervoltage detection
- ± 1.5% feedback voltage accuracy with temperature
- Low-side adjustable current sensing
- Adjustable soft start
- Tracking and sequencing of shutdown and soft-start pins
- TSSOP - 14 package
illustrate
The LM2745/8 is a high-speed synchronous buck regulator controller with an accurate feedback voltage accuracy of ± 1.5%. It can provide simple downconversion output voltages as low as 0.6V. While the IC control section is rated for 3 to 6V, the drive section is designed to accept up to 14V high input power rails. The use of adaptive, 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 LM2745/8 features a fixed-frequency voltage-mode PWM control architecture, which is regulated from 50 kHz to 1 MHz with an external resistor. In addition, the LM2745 allows for synchronization of external clock signals with a switching frequency range of 250 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 load capacity start of pre-biased outputs, 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.
apply
- Downward conversion from 3.3V
- Cable modems, DSL, and ADSL
- Laser printers and inkjet printers
- Low voltage power module
- DSP, ASIC core and I/O
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