LM2747

ACTIVE

1-V to 14-V, voltage mode synchronous buck controller with pre-bias startup and optional clock sync

A newer version of this product is available

open-in-new Compare alternates
Similar functionality to the compared device
TPS546A24A ACTIVE 2.95-V to 18-V, stackable 10-A synchronous SWIFT™ buck converter with pin-strapping and PMBus Upgraded PMBus and faster switching frequency.

Product details

Vin (min) (V) 1 Vin (max) (V) 14 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 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 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
  • ±1% Feedback Voltage Accuracy Over Temperature
  • Switching Frequency from 50 kHz to 1 MHz
  • Switching Frequency Synchronize Range 250 kHz to 1 MHz
  • 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
  • Low-Side Adjustable Current Sensing
  • Adjustable Soft-Start
  • Tracking and Sequencing with Shutdown and Soft Start Pins
  • 14-Pin TSSOP Package

All trademarks are the property of their respective owners.

  • ±1% Feedback Voltage Accuracy Over Temperature
  • Switching Frequency from 50 kHz to 1 MHz
  • Switching Frequency Synchronize Range 250 kHz to 1 MHz
  • 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
  • Low-Side Adjustable Current Sensing
  • Adjustable Soft-Start
  • Tracking and Sequencing with Shutdown and Soft Start Pins
  • 14-Pin TSSOP Package

All trademarks are the property of their respective owners.

The LM2747 is a high-speed synchronous buck regulator controller with a feedback voltage accuracy of ±1%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control section of the IC is rated for 3 to 6V, the driver section is 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 LM2747 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 LM2747 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 LM2747 is a high-speed synchronous buck regulator controller with a feedback voltage accuracy of ±1%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control section of the IC is rated for 3 to 6V, the driver section is 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 LM2747 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 LM2747 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.

Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 8
Type Title Date
* Data sheet LM2747 Synch Buck Cntrlr w/Pre-bias Startup 7 Optional Clk Synch datasheet (Rev. B) 28 Mar 2013
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
EVM User's guide AN-1449 LM2747 Evaluation Board (Rev. A) 06 May 2013
EVM User's guide AN-1641 LM2747-19A Demo Board (Rev. A) 06 May 2013
Application note AN-1603 LM274X Reference Designs (Rev. C) 01 May 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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Package Pins CAD symbols, footprints & 3D models
TSSOP (PW) 14 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos