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Boost controllers (external switch)

LM5122

ACTIVE

3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

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Data sheet

LM5122

ACTIVE
Data sheet Order now

Product details

Vin (Min) (V) 3 Vin (Max) (V) 65 Vout (Min) (V) 3 Vout (Max) (V) 100 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 4 Features Enable, Frequency Synchronization, Phase Interleaving, Synchronous Rectification, UVLO Adjustable Duty cycle (Max) (%) 100 Rating Catalog Operating temperature range (C) -40 to 125
Vin (Min) (V) 3 Vin (Max) (V) 65 Vout (Min) (V) 3 Vout (Max) (V) 100 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 4 Features Enable, Frequency Synchronization, Phase Interleaving, Synchronous Rectification, UVLO Adjustable Duty cycle (Max) (%) 100 Rating Catalog Operating temperature range (C) -40 to 125
HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 HTSSOP (PWP) 24 34 mm² 7.7 x 4.4
  • Maximum Input Voltage: 65 V
  • Minimum Input Voltage: 3 V (4.5 V for Start-Up)
  • Output Voltage up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1% Accuracy
  • Free-Run and Synchronizable Switching to 1 MHz
  • Peak-Current-Mode Control
  • Robust 3-A Integrated Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode-Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • Hiccup-Mode Overload Protection
  • Programmable Line UVLO
  • Programmable Soft Start
  • Thermal Shutdown Protection
  • Low Shutdown Quiescent Current: 9 µA
  • Programmable Slope Compensation
  • Programmable Skip-Cycle Mode Reduces Standby Power
  • Allows External VCC Supply
  • Inductor DCR Current Sensing Capability
  • Multi-phase Capability
  • Thermally Enhanced 20 or 24-Pin HTSSOP
  • Create a Custom Design Using the LM5122 With the WEBENCH® Power Designer
  • Maximum Input Voltage: 65 V
  • Minimum Input Voltage: 3 V (4.5 V for Start-Up)
  • Output Voltage up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1% Accuracy
  • Free-Run and Synchronizable Switching to 1 MHz
  • Peak-Current-Mode Control
  • Robust 3-A Integrated Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode-Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • Hiccup-Mode Overload Protection
  • Programmable Line UVLO
  • Programmable Soft Start
  • Thermal Shutdown Protection
  • Low Shutdown Quiescent Current: 9 µA
  • Programmable Slope Compensation
  • Programmable Skip-Cycle Mode Reduces Standby Power
  • Allows External VCC Supply
  • Inductor DCR Current Sensing Capability
  • Multi-phase Capability
  • Thermally Enhanced 20 or 24-Pin HTSSOP
  • Create a Custom Design Using the LM5122 With the WEBENCH® Power Designer

The LM5122 is a multi-phase capable synchronous boost controller intended for high-efficiency synchronous boost regulator applications. The control method is based upon peak-current-mode control. Current-mode control provides inherent line feed forward, cycle-by-cycle current limiting, and ease of loop compensation.

The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved by two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode-emulation mode also enables discontinuous-mode operation for improved efficiency at light load conditions.

An internal charge pump allows 100% duty cycle for high-side synchronous switch (bypass operation). A 180° phase shifted clock output enables easy multi-phase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup-mode current limit, and adjustable line undervoltage lockout.

The LM5122 is a multi-phase capable synchronous boost controller intended for high-efficiency synchronous boost regulator applications. The control method is based upon peak-current-mode control. Current-mode control provides inherent line feed forward, cycle-by-cycle current limiting, and ease of loop compensation.

The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved by two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode-emulation mode also enables discontinuous-mode operation for improved efficiency at light load conditions.

An internal charge pump allows 100% duty cycle for high-side synchronous switch (bypass operation). A 180° phase shifted clock output enables easy multi-phase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup-mode current limit, and adjustable line undervoltage lockout.
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Technical documentation

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Type Title Date
* Data sheet LM5122 Wide-Input Synchronous Boost Controller With Multiple Phase Capability datasheet (Rev. H) PDF | HTML 09 Jun 2017
Technical article How to add overvoltage protection to a synchronous boost controller 17 Sep 2018
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018
Application note Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 13 Nov 2017
Analog Design Journal Designing the front-end DC/DC conversion stage to withstand automotive transient 18 Jan 2017
User guide PMLK Boost Experiment Book (Rev. A) 31 Aug 2016
White paper Under the Hood of a Multiphase Synchronous Rectified Boost Converter 02 Oct 2015
White paper Under the Hood of a Multiphase Synchronous Rectified Boost Converter (PPT) 02 Oct 2015
Technical article Power Tips: Synchronize your SEPIC 29 Apr 2015
Technical article Exploiting current-mode control for wide Vin DC/DC conversion 15 Aug 2014
White paper How to design boost, SEPIC or flyback regulators with wide VIN power ICs 29 Jul 2014
Technical article Power Tips: Power Supplies for Car Audio 28 Mar 2014
Application note Automated Frequency Response Analyzer 09 Oct 2013
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
EVM User's guide LM5122EVM-1PH User's Guide 22 Apr 2013
EVM User's guide LM5122EVM-2PH User's Guide 22 Apr 2013

Design & development

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

Evaluation board

LM5122EVM-1PH — LM5122EVM-1PH Wide Vin Synchronous Boost Controller Evaluation Module

The LM5122EVM-1PH evaluation module (EVM) provides the design engineer with a fully functional synchronous boost converter to evaluate the Texas Instruments LM5122 synchronous boost controller IC. The EVM provides 24V output at up to 4.5A current from a 9V to 20V input. The EVM is designed to (...)
Not available on TI.com
Evaluation board

LM5122EVM-2PH — LM5122EVM-2PH Wide Vin Synchronous Boost Controller Evaluation Module

The LM5122EVM-2PH evaluation module (EVM) provides the design engineer with a fully functional dual phase synchronous boost converter to evaluate the Texas Instruments LM5122 synchronous boost controller IC. The EVM provides 28V output at up to 7A current from a 9V to 20V input. The EVM is (...)
Not available on TI.com
Evaluation board

PMLKBOOSTEVM — TI-PMLK Boost Experiment Board using TPS55340 & LM5122

The TI-PMLK Boost Experiment Board is part of the TI Power Management Lab Kit (TI-PMLK) series. TI-PMLK series provides hands on learning to reinforce power supply knowledge. The modular format allows users to customize the TI-PMLK series experience in a way that makes the most impact on (...)

document-pdfAcrobat User guide
Not available on TI.com
Evaluation board

PMLKBOOSTEVMB — TI-PMLK Boost Experiment Board using TPS55340 & LM5122 with TI-PMLK Boost Experiment Lab Book

The TI-PMLK Boost Experiment Board is part of the TI Power Management Lab Kit (TI-PMLK) series. TI-PMLK series provides hands on learning to reinforce power supply knowledge. The modular format allows users to customize the TI-PMLK series experience in a way that makes the most impact on (...)

document-pdfAcrobat User guide
Not available on TI.com
Simulation model

LM5122-Q1 PSpice Model (Rev. B) LM5122-Q1 PSpice Model (Rev. B)

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Simulation model

LM5122 TINA-TI Transient Spice Model (Rev. B) LM5122 TINA-TI Transient Spice Model (Rev. B)

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Simulation model

LM5122 TINA-TI Transient Reference Design (Rev. B) LM5122 TINA-TI Transient Reference Design (Rev. B)

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Simulation model

LM5122 Dual-Phase TINA-TI Transient Reference Design LM5122 Dual-Phase TINA-TI Transient Reference Design

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Simulation model

LM5122 Unencrypted PSpice Average Model Package (Rev. A) LM5122 Unencrypted PSpice Average Model Package (Rev. A)

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Simulation tool

PSPICE-FOR-TI PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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