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LM2745MTC
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LM2745MTC

  • Category:Controller controller
  • Product Name:Prebias startup and synchronous buck controller from the optional clock
  • Manufacturers:NSC
  • Production Batch Number:10+
  • Encapsulation:TSSOP
  • Stock Status:There is stock
  • Stock Quantity:20000
  • Minimum order quantity: 1
  • Details:Click here to find the LM2745MTC pdf
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  • Product introduction

peculiarity

  • Switching frequency from 50 kHz to 1 MHz
  • Switching frequency synchronization range 250 kHz to 1 MHz (LM2745 only)
  • Start the output load with pre-bias
  • The power stage input voltage is from 1V to 14V
  • The input voltage in the control phase is from 3V to 6V
  • The output voltage can be adjusted down to 0.6V
  • The power is well marked and turned off
  • Output overvoltage and undervoltage detection
  • ± 1.5% feedback voltage with temperature accuracy
  • 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 provides a simple down-conversion output voltage as low as 0.6V. Although rated for the 3 to 6V IC control section, the driver section is designed to accept high input rails up to 14V. The use of adaptive, non-overlapping MOSFET gate drivers helps avoid potential pass-through issues 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 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 synchronization of external clock signals with switching frequency ranges from 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 capability start-up for prebiased outputs, 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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  • Convert down from 3.3V
  • Cable modem, DSL and ADSL
  • Laser printers and inkjet printers
  • Low voltage power module
  • DSP, ASIC core and I/O

andLM2745MTCRelated ICs are:


Model Manufacturers lot number encapsulation illustrate
LM2745MTC/NOPB   10+11+   Hong Kong spot, imported original
LM2745MTCX NSC 10+ SSOP-14 Prebias startup and synchronous buck controller from the optional clock
LM2745MTC NSC 10+ TSSOP Prebias startup and synchronous buck controller from the optional clock

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