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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 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost, Flyback, Forward, SEPIC Rating Catalog Vout (min) (V) 3 Vout (max) (V) 100 Features Enable, Frequency synchronization, Phase Interleaving, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 4000 Duty cycle (max) (%) 100
Vin (min) (V) 3 Vin (max) (V) 65 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost, Flyback, Forward, SEPIC Rating Catalog Vout (min) (V) 3 Vout (max) (V) 100 Features Enable, Frequency synchronization, Phase Interleaving, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 4000 Duty cycle (max) (%) 100
HTSSOP (PWP) 24 49.92 mm² 7.8 x 6.4 HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • 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
Application note Analysis and Solution of the LM5122 Bypass Function Loss 03 Jun 2024
Technical article How to add overvoltage protection to a synchronous boost controller PDF | HTML 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 brief 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 PDF | HTML 29 Apr 2015
White paper How to design boost, SEPIC or flyback regulators with wide VIN power ICs 29 Jul 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 (...)
User guide: PDF
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 (...)
User guide: PDF
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 (...)

User guide: PDF
Not available on TI.com
Simulation model

LM5122 Dual-Phase TINA-TI Transient Reference Design

SNVMAV2.TSC (729 KB) - TINA-TI Reference Design
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Simulation model

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

SNVM495B.TSC (188 KB) - TINA-TI Reference Design
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Simulation model

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

SNVM494B.ZIP (52 KB) - TINA-TI Spice Model
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Simulation model

LM5122 Unencrypted PSpice Average Model Package (Rev. A)

SNVMBC0A.ZIP (78 KB) - PSpice Model
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Simulation model

LM5122-Q1 PSpice Model (Rev. B)

SNVM416B.ZIP (56 KB) - PSpice Model
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Calculation tool

LM5122-BOOST-CALC — LM5122 quick start calculator

LM5122 quick start calculator for boost topology
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5122 — 3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability LM5122-Q1 — Automotive, 3-V to 65-V wide VIN, current mode synchronous boost controller with multiphase LM5122ZA — 3-V to 65-V wide VIN, current mode synchronous boost controller with multiphase capability
Hardware development
Evaluation board
LM5122EVM-1PH — LM5122EVM-1PH Wide Vin Synchronous Boost Controller Evaluation Module LM5122EVM-2PH — LM5122EVM-2PH Wide Vin Synchronous Boost Controller Evaluation Module
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