Startseite Energiemanagement AC/DC- und DC/DC-Controller (externer FET)

LM2745

AKTIV

1-V- bis 14-V-Synchron-Abwärtsregler im Spannungsmodus mit Vorspannungsstart und optionaler Taktsync

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Ähnliche Funktionalität wie verglichener Baustein
TPS546B24A AKTIV Stapelbarer synchroner Abwärtswandler der SWIFT™-Reihe, 2,95 bis 18 V, 20 A, mit Pin-Strapping und P Upgraded converter with PMBus, extended operating temperature and faster switching frequency.

Produktdetails

Vin (min) (V) 1 Vin (max) (V) 14 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Topology Buck Rating Catalog Vout (min) (V) 0.6 Vout (max) (V) 12 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Iq (typ) (µA) 1700 Duty cycle (max) (%) 86 Number of phases 1
Vin (min) (V) 1 Vin (max) (V) 14 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode Voltage mode Topology Buck Rating Catalog Vout (min) (V) 0.6 Vout (max) (V) 12 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Iq (typ) (µA) 1700 Duty cycle (max) (%) 86 Number of phases 1
TSSOP (PW) 14 32 mm² 5 x 6.4
  • Switching Frequency from 50 kHz to 1 MHz
  • Switching Frequency Synchronize Range 250 kHz to 1 MHz (LM2745 Only)
  • Startup with a Pre-biased Output Load
  • Power Stage Input Voltage from 1V to 14V
  • Control Stage Input Voltage from 3V to 6V
  • Output Voltage Adjustable Down to 0.6V
  • Power Good Flag and Shutdown
  • Output Overvoltage and Undervoltage Detection
  • ±1.5% Feedback Voltage Accuracy Over Temperature
  • Low-side Adjustable Current Sensing
  • Adjustable Soft-start
  • Tracking and Sequencing with Shutdown and Soft Start Pins
  • TSSOP-14 Package

All trademarks are the property of their respective owners.

  • Switching Frequency from 50 kHz to 1 MHz
  • Switching Frequency Synchronize Range 250 kHz to 1 MHz (LM2745 Only)
  • Startup with a Pre-biased Output Load
  • Power Stage Input Voltage from 1V to 14V
  • Control Stage Input Voltage from 3V to 6V
  • Output Voltage Adjustable Down to 0.6V
  • Power Good Flag and Shutdown
  • Output Overvoltage and Undervoltage Detection
  • ±1.5% Feedback Voltage Accuracy Over Temperature
  • Low-side Adjustable Current Sensing
  • Adjustable Soft-start
  • Tracking and Sequencing with Shutdown and Soft Start Pins
  • TSSOP-14 Package

All trademarks are the property of their respective owners.

The LM2745/8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit.

The LM2745/8 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2745 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency.

Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail.

The LM2745/8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit.

The LM2745/8 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2745 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency.

Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail.

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Technische Dokumentation

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Alle anzeigen 8
Typ Titel Datum
* Data sheet LM2745/48 Synch Buck Controller w/ Pre-Bias Startup & Optional Clk Synch datasheet (Rev. E) 03 Apr 2013
User guide LM2745 & LM2748 Buck Controller Evaluation Module User's Guide (Rev. B) PDF | HTML 09 Feb 2022
User guide LM2745 Buck Controller Evaluation Module User's Guide (Rev. B) PDF | HTML 07 Feb 2022
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
Application note AN-1603 LM274X Reference Designs (Rev. C) 01 Mai 2013
Application note Current Limit Foldback Improves Short Circuit Protection in LM274X Family (Rev. B) 23 Apr 2013
Application note Optmiz Pwr Cntrlr Dsigns thru Utiliz Freq & Sync, Ext Ref, Trking & Precis EN 24 Apr 2008

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