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LM2742

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2.2-V to 16-V, voltage mode synchronous buck controller with adjustable soft start

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Product details

Vin (min) (V) 2.2 Vin (max) (V) 16 Vout (min) (V) 0.6 Vout (max) (V) 13.5 Iout (max) (A) 20 Iq (typ) (mA) 1.5 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 2000 Features Enable, Power good, Synchronous Rectification Operating temperature range (°C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog Control mode Voltage mode Type Controller
Vin (min) (V) 2.2 Vin (max) (V) 16 Vout (min) (V) 0.6 Vout (max) (V) 13.5 Iout (max) (A) 20 Iq (typ) (mA) 1.5 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 2000 Features Enable, Power good, Synchronous Rectification Operating temperature range (°C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog Control mode Voltage mode Type Controller
TSSOP (PW) 14 32 mm² 5 x 6.4
  • Input Power from 1V to 16V
  • Output Voltage Adjustable down to 0.6V
  • Power Good Flag, Adjustable Soft-start and Output Enable for Easy Power Sequencing
  • Reference Accuracy: 1.5% (0°C–125°C)
  • Current Limit Without Sense Resistor
  • Soft Start
  • Switching Frequency from 50 kHz to 2 MHz
  • 40ns Typical Minimum On-time
  • TSSOP-14 Package

All trademarks are the property of their respective owners.

  • Input Power from 1V to 16V
  • Output Voltage Adjustable down to 0.6V
  • Power Good Flag, Adjustable Soft-start and Output Enable for Easy Power Sequencing
  • Reference Accuracy: 1.5% (0°C–125°C)
  • Current Limit Without Sense Resistor
  • Soft Start
  • Switching Frequency from 50 kHz to 2 MHz
  • 40ns Typical Minimum On-time
  • TSSOP-14 Package

All trademarks are the property of their respective owners.

The LM2742 is a high-speed, synchronous, switching regulator controller. It is intended to control currents of 0.7A to 20A with up to 95% conversion efficiencies. Power up and down sequencing is achieved with the power-good flag, adjustable soft-start and output enable features. The LM2742 operates from a low-current 5V bias and can convert from a 1V to 16V power rail. The part utilizes a fixed-frequency, voltage-mode, PWM control architecture and the switching frequency is adjustable from 50kHz to 2MHz by setting the value of an external resistor. Current limit is achieved by monitoring the voltage drop across the on-resistance of the low-side MOSFET, which enables on-times on the order of 40ns, one of the best in the industry. The wide range of operating frequencies gives the power supply designer the flexibility to fine-tune component size, cost, noise and efficiency. The adaptive, non-overlapping MOSFET gate-drivers and high-side bootstrap structure helps to further maximize efficiency. The high-side power FET drain voltage can be from 1V to 16V and the output voltage is adjustable down to 0.6V.

The LM2742 is a high-speed, synchronous, switching regulator controller. It is intended to control currents of 0.7A to 20A with up to 95% conversion efficiencies. Power up and down sequencing is achieved with the power-good flag, adjustable soft-start and output enable features. The LM2742 operates from a low-current 5V bias and can convert from a 1V to 16V power rail. The part utilizes a fixed-frequency, voltage-mode, PWM control architecture and the switching frequency is adjustable from 50kHz to 2MHz by setting the value of an external resistor. Current limit is achieved by monitoring the voltage drop across the on-resistance of the low-side MOSFET, which enables on-times on the order of 40ns, one of the best in the industry. The wide range of operating frequencies gives the power supply designer the flexibility to fine-tune component size, cost, noise and efficiency. The adaptive, non-overlapping MOSFET gate-drivers and high-side bootstrap structure helps to further maximize efficiency. The high-side power FET drain voltage can be from 1V to 16V and the output voltage is adjustable down to 0.6V.

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Type Title Date
* Data sheet LM2742 N-Chan FET Synch Buck Reg Cntrlr for Low Output Voltages datasheet (Rev. C) 28 Mar 2013
User guide LM2742 Buck Controller Evaluation Module User's Guide (Rev. B) PDF | HTML 24 Jan 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 Automated Frequency Response Analyzer 09 Oct 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
Application note Power Management Considerations for FPGAs and ASICs 22 Mar 2007

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