LM5122

ACTIVE

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

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Product details

Parameters

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 open-in-new Find other Boost controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 HTSSOP (PWP) 24 34 mm² 7.7 x 4.4 open-in-new Find other Boost controllers (external switch)

Features

  • 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

All trademarks are the property of their respective owners.

open-in-new Find other Boost controllers (external switch)

Description

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.

open-in-new Find other Boost controllers (external switch)
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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 17
Type Title Date
* Datasheet LM5122 Wide-Input Synchronous Boost Controller With Multiple Phase Capability datasheet (Rev. H) Jun. 09, 2017
Technical articles How to add overvoltage protection to a synchronous boost controller Sep. 17, 2018
White papers An overview of radiated EMI specifications for power supplies Jun. 05, 2018
White papers An overview of conducted EMI specifications for power supplies Feb. 01, 2018
Application notes Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout Nov. 13, 2017
Application notes Designing the front-end DC/DC conversion stage to withstand automotive transient Jan. 18, 2017
User guides PMLK Boost Experiment Book (Rev. A) Aug. 31, 2016
White papers Under the Hood of a Multiphase Synchronous Rectified Boost Converter Oct. 02, 2015
White papers Under the Hood of a Multiphase Synchronous Rectified Boost Converter (PPT) Oct. 02, 2015
Technical articles Power Tips: Synchronize your SEPIC Apr. 29, 2015
Technical articles Exploiting current-mode control for wide Vin DC/DC conversion Aug. 14, 2014
White papers How to design boost, SEPIC or flyback regulators with wide VIN power ICs Jul. 29, 2014
Technical articles Power Tips: Power Supplies for Car Audio Mar. 28, 2014
Application notes Automated Frequency Response Analyzer Oct. 09, 2013
White papers Wide VIN power management ICs simplify white paper (Rev. A) Sep. 19, 2013
User guides LM5122EVM-1PH User's Guide Apr. 22, 2013
User guides LM5122EVM-2PH User's Guide Apr. 22, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
99
Description
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 start (...)
Features
  • 9V to 20V Input Range
  • 24V/4.5A output
  • 250kHz switching frequency
  • Selectable light load switching mode
  • Easy accessible test points
EVALUATION BOARDS Download
document-generic User guide
149
Description
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 designed (...)
Features
  • 9V to 20V Input Range
  • 28V/7.0A output
  • 250kHz switching frequency
  • Pulse Skipping at light load
  • Dual Phase Interleaved Operation
EVALUATION BOARDS Download
document-generic User guide
89
Description

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 (...)

Features
  • Two different IC sections to expand the learning experience:  TPS55340 & LM5122
  • Each section is configurable with jumpers for different exercises
  • The TI-PMLK Boost Experiment Board is accompanied by a downloadable TI-PMLK Boost Experiment Lab Book
EVALUATION BOARDS Download
document-generic User guide
99
Description

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 (...)

Features
  • Two different IC sections to expand the learning experience:  TPS55340 & LM5122
  • Each section is configurable with jumpers for different exercises
  • The Boost Board is accompanied by a bound version of the Boost Experiments Book

Design tools & simulation

SIMULATION MODELS Download
SNVM416B.ZIP (56 KB) - PSpice Model
SIMULATION MODELS Download
SNVM494B.ZIP (52 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVM495B.TSC (188 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMAV2.TSC (729 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMBC0A.ZIP (78 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

Many TI reference designs include the LM5122 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options
HTSSOP (PWP) 24 View options

Ordering & quality

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