LM5122

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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 Type Controller Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Boost controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 24 34 mm² 7.7 x 4.4 HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 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

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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
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 and flyback regulators with wide VIN boost pwr ICs Jul. 29, 2014
Selection guides Wide VIN DC/DC power solutions: industrial, automotive, and comms applications Jun. 06, 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
$99.00
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
$149.00
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
$89.00
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
$99.00
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

Reference designs

REFERENCE DESIGNS Download
Tiny SEPIC reference design with 12-V/ 2.5-A output
PMP30491 This reference design is a 12-V pre regulator reference design for multiple automotive applications powering up to 36-W. The used SEPIC topology allows to step up and step down the input voltage, so cranking down to 5-V is supported; the controller LM5122 itself allows cranking down to 3-V at (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Power Reference Design for 450W Automotive Audio Amplifier
PMP7837 The PMP7837 is a 4-phase synchronous boost converter that can take a 6-17V input and put out 24V at 450W. It is used for powering up to eight 50W automotive trunk amplifiers. The 4-phase synchronous design with 450kHz switching frequency per phase results in a compact and efficient circuit well (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
154W Synchronous Boost Converter Reference Design
PMP21277 — PMP21277 is a single-phase synchronous boost converter reference design using the LM5122 boost controller IC. The design accepts an input voltage of 10.8Vin to 13.2Vin (12Vin Nominal) and provides an output of
20.5Vout capable of supplying 7.5A of continuous current to the load. The design was built (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
25W Isolated Synchronous Flyback Reference Design
PMP10541 — PMP10541 is an isolated synchronous flyback converter reference design which utilizes the LM5122 controller for industrial applications. The switching frequency is set to 230 kHz for high efficiency at a nominal output power of 25W. A planar power transformer provides good coupling and thermal (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
98% 135W Single Phase Boost Reference Design
PMP21274 — PMP21274 is a single-phase boost utilizing the LM5122 controller. This reference design can operate from 12V to 50V. The design has an output of 54V and capable of sourcing 2.5A continuous current. LM5112 has a bypass function where Vin is equal or greater than the set output voltage, the device (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
200W Synchronous Boost Audio Amplifier Reference Design
PMP20093 — The PMP20093 reference design is a synchronous boost converter that operates from 9V - 16Vin and supplies 35V @ 5.72A out (200W) which is ideally suited for audio applications.  Operation at 250KHz delivers compact size and greater than 97% full load efficiency.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Tiny SEPIC Reference Design with 12V/ 2A Max Output
PMP30232 — The PMP30232 reference design operates at an input voltage range of 6V to 18V. Cranking is possible for voltages as low as 5V and load dump for voltages to 36V. The output voltage is 12V @ 2A. This reference design uses the SEPIC topology as a cost effective alternative for 4 switch buck-boost (for (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Tiny SEPIC Reference Design Suitable for Cranking and Dump
PMP30210 — The PMP30210 reference design accepts an input voltage range of 5V to 42V. Cranking is possible for voltages as low as 4V and load dump for voltages to 60V. The output voltage is 5V@1A. 
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
6V-16V Input Four Phase Synchronous Boost Converter Audio Amplifier (25V@24A) Reference Design
PMP11112 — This 600W four phase synchronous boost  supplies 25V @ 24A from a 6V - 16V input. Four phase operation allows fewer input and output capacitors and better thermal balancing with surface mount components.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
125W Non-Isolated Inverting Buck Boost for Telecom -48V Applications Reference Design
PMP20371 — PMP20371 is a synchronous buck boost design utilizing the LM5122 for telecom applications. This design has a minimum operating input voltage of -35V and a maximum input voltage of -60V.  Switching frequency is set to 150kHz. The design is built on PMP20371 PCB, 4 layer board with 2oz copper on (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
12Vin to 50Vin; 54Vout @ 2.5A; Single-Phase Synchronous Boost Converter Reference Design
PMP7970 PMP7970 is a synchronous boost converter utilizing the LM5122 for industrial applications. This design has a minimum operating input voltage of 12V and a maximum input voltage of 54V. Capable of deliverying 135W power to the load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
12Vin to 67Vin, 54Vout at 4.8A, 260W Dual-Phase Boost Reference Design
PMP7979 PMP7979 is a synchronous dual-phase boost power supply using the LM5122 controllers. The design accepts an input voltage of 12 V to 67 V, and boosts a 54-V output rail that is capable of sourcing 4.8-A continuous current. The LM5122 has an internal current source to keep the high-side FET to run at (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Multi-Phase Boost with a 35V in and 38 to 55 Volt Output
PMP7869 — PMP7869 is a 35 Volts multi-phase synchronous Boost with 38 to 55 volts out at 6 Amps continuous.
Design files
REFERENCE DESIGNS Download
30W Isolated Synchronous Flyback Converter Reference Design
PMP10506 PMP10506 is an isolated synchronous flyback converter using the LM5122 controller IC. The design accepts an input voltage of 9Vin to 60Vin and provides an isolated output of 5Vout capable of supplying 6A of continuous current to the load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
6V to 8.4V input, 12Vout @ 84A Peak Pulse Multi-Phase Boost Converter Reference Design
PMP7921 PMP7921 is a multi-phase boost converter. The design accepts an input voltage of 7V to 8V, and outputs 12V, capable of providing 84A peak current for 5msec. The design outputs 1000W of peak power, and peak efficiency reaches 96%.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
14Vin to 15.5Vin, 24Vout @ 8A Synchronous Boost Converter Reference Design
PMP9386 PMP9385 is a synchronous dual-phase boost converter accepts an input voltage of 14V to 15.5V, and outputs 24V, capable of providing 8A of current to the load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
12.5Vin to 15.5Vin, 24Vout @ 8A Synchronous Boost Converter Reference Design
PMP9385 PMP9385 is a Single-Phase Synchronous Boost Converter which accepts an input voltage of 12.5Vin to 15.5Vin and provides an output of 24Vout capable of supplying a maximum of 8A of current to the load. Design uses an LM5122 Synchronous Boost controller and CSD18531Q5A FETs.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
9 to 60Vin 12Vout @ 5A Single-Phase Isolated Synchronous Flyback Converter Reference Design
PMP9256 PMP9256 is an isolated synchronous flyback converter utilizing the LM5122 for industrial applications. The benefit of using a synchronous flyback is higher efficiency compared to a non-synchronous flyback.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Public Announcement Audio Reference Design utilizing best in class Boost Controller
PMP10710 PMP10710 is a 200W design for public announcement audio system which can be used in 100W +100W Stereo or 200W Woofer Applications. The design is broadly divided into four main stages:
  1. Single-Phase Synchronous Boost Converter using the LM5122 controller IC.  The design accepts an input voltage of (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
135W Single-Phase Synchronous Boost Converter Reference Design
PMP9431 The PMP9431 reference design is a high-efficiency single-phase synchronous boost converter using the LM5122 controller IC. The design accepts an input voltage of 12Vin to 50Vin and provides an output of 54Vout capable of supplying 2.5A of current to the load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High-Efficiency Adjustable Output Synchronous Boost Converter Reference Design
PMP10538 PMP10538 is a Single-Phase Synchronous Boost Converter using the LM5122 controller IC. The design accepts an input voltage of 18Vin to 20Vin and provides an output of 30Vout to 54Vout, capable of supplying 1.7A of continuous current to the load or 0A to 3.4A Max. The output voltage can be adjusted (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High-Efficiency 4 Phase Synchronous Boost Conv for Automotive Trunk Amplifier App Reference Design
PMP7969 PMP7969 is a very high efficiency 4 phase boost controller synchronizable to external clock. Light load efficiency is excellent due to phase shedding capability. Synchronous rectifier also improves efficiency. High effective switching frequency obtained with multiphase over single phase, and current (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
270W Dual-Phase Boost Converter for Automotive Applications Reference Design
PMP9595 This two-phase boost operates from 6V - 36Vin and supplies 18V at 15A out (inputs higher than 18V pass through to the output). Small surface mount components are realized thanks to a high switching frequency and ripple cancellation on input and output capacitors.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
144W Single-Phase Synchronous Boost Converter With DCR Current Sensing
PMP9393 PMP9393 is a Single-Phase Synchronous Boost Converter which utilizes the LM5122 controller IC.  The design accepts an input voltage of 18Vin to 20Vin and provides an output of 48Vout capable of supplying a maximum of 3A of current to the load. DCR current sensing has been implemented in order (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
12V@5A Synchronous SEPIC Converter Reference Design
PMP10886 This reference design operates from a 6V to 16V input and supplies 12V @ 5A out. It utilizes the LM5122 synchronous boost controller to operate as a synchronous SEPIC converter.  The circuit achieves greater than 95% efficiency at maximum load.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Highly Efficient and Compact 100W Automotive Amplifier Reference Design with Boost Converter
PMP9484 PMP9484 is a 100W highly efficient and compact automotive amplifier reference design which can be used in 50W +50W stereo or 100W woofer applications.  The design is broadly divided into three main stages:
1.) Highly efficient single-phase synchronous boost converter using the LM5122 controller (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Power Solution for an Automotive Voltage Stabilizer
PMP7919 The PMP7919 is a 2-phase synchronous boost converter that can take a minimum 5.5V input and put out 11.5V or higher at 15A. It is used in the Voltage Quality Module in a start-stop vehicle where warm cranking is not allowed to cause certain electronic loads (such as the head unit) to power cycle (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
51V@1.25A Automotive Range Sync Boost converter
PMP8532 This wide input voltage range boost design operates from an input of 6.5V to 36V and provides two outputs of 51V@1.25A.
Design files
REFERENCE DESIGNS Download
9 to 16Vin 12Vout @ 5A Single-Phase Synchronous Flyback Converter Reference Design
PMP9258 A single-phase synchronous flyback converter accepting an input voltage of 9VDCin to 16VDCin and providing an output of 12VDCout capable of supplying 5A.
REFERENCE DESIGNS Download
Power Solution for an Automotive Voltage Quality Module
PMP7916 The PMP7916 is a boost converter that can be used by a voltage quality module in a start-stop car to condition the battery voltage seen by electronic loads. For such a car to utilize existing electronic assemblies, input voltage to the assemblies is not allowed to dip to 6V during warm cranking or (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Power Solution for an Engineering Equipment Fuel Injector
PMP7967 The PMP7967 converts a DC input of 6V-42V to an output of 90V at 1.5A.  The design uses four interleaved LM5122 boost controllers with each controller switching at 100kHz. The resulting 4-phase boost converter has a ripple frequency of 400kHz. Freqeucny can also be synchronized to an external (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
18 to 20Vin 25 to 85Vout @3A Continuous 5.7A Peak Dual-Phase Sync Boost Converter Reference Design
PMP9309 A dual-phase synchronous boost converter accepting an input voltage of 18VDCin to 20VDCin and providing an output of 25VDCout to 85Vout capable of supplying 3A continuous and 5.7A peak.
Design files
REFERENCE DESIGNS Download
12Vin to 50Vin (67Vin Peak); 48Vout @ 2.5A; Single-Phase Synchronouos Boost Converter
PMP7965 A single-phase synchronous boost converter accepting an input voltage of 12Vin to 50Vin with a peak of 67Vin and providing an output of 48Vout capable of supplying 2.5A of current.
Design files
REFERENCE DESIGNS Download
7.5Vin to 10Vin; 11.5Vout @ 65A; 4-Phase Synchronous Boost Converter
PMP7937 — A 4-phase synchronous boost converter that accepts an input voltage of 7.5Vin to 10Vin and provides an output of 11.5Vout capable of delivering 65A.
Design files
REFERENCE DESIGNS Download
10.8Vin to 13.2Vin; 48Vout @ 7.3A; 4-Phase Synchronous Boost Converter
PMP7944 — A 4-phase synchronous boost converter that accepts an input voltage of 10.8Vin to 13.2Vin providing an output of 48Vout capable of delivering 7.3A.
Design files
REFERENCE DESIGNS Download
18Vin to 20Vin; 53Vout to 84Vout @ 1A; Single-Phase Synchronous Boost Converter
PMP7950 — A single-phase synchronous boost converter that accepts an input voltage of 10.8Vin to 13.2Vin and provides an output of 53Vout to 84Vout capable of delivering 1A.
Design files
REFERENCE DESIGNS Download
6Vin to 16Vin; 12Vout @ 16.7A; Single-Phase Synchronous Boost Converter
PMP7959 — A single-phase synchronous boost converter that accepts an input voltage of 6Vin to 16Vin and provides an output of 12Vout capable of supplying 16.7A.
Design files
REFERENCE DESIGNS Download
48Vin; 110Vout @ 3A; Dual-Phase Non-Synchronous Boost Converter
PMP7973 — A dual-phase non-synchronous boost converter that takes in an input voltage of 48Vin and boosts to 110Vout capable of supplying up to 3A of current.
Design files
REFERENCE DESIGNS Download
12Vin; 20Vout @ 8A; Single-Phase Synchronous Boost Converter
PMP7961 — A single-phase synchronous boost converter that accepts an input voltage of 12V and provides an output of 20Vout capable of supplying 8A.
Design files
REFERENCE DESIGNS Download
Power Solution for an Automotive Fuel Injector
PMP7966 PMP7966 is a 4-phase boost converter rated for 52V output at 2.5A from an input voltage of 6V to 42V. This design uses LM5122 boost controllers at a switching frequency of 100 kHz each phase, resulting in 400 kHz input and output ripple. 680μF aluminum electrolytic capacitors are used at the (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
10.8Vin to 13.2Vin; 12Vout @ 5A; Non-Isolated Synchronous Flyback Converter
PMP7992 — A synchronous flyback converter accepting an input voltage of 10.8Vin to 13.2Vin and providing a non-isolated output of 12Vout capable of supplying 5A.
REFERENCE DESIGNS Download
Automotive Boost Converter with Reverse Battery Protection
PMP7936 — PMP7936 is a boost converter capable of 138W output power and targeted for automotive appli-cations. This design uses the LM5122 synchronous boost current-mode PWM controller. The circuit will start at a minimum input of 6.5V and has an operating input voltage range of 4.5V to 42V. The output is (...)
REFERENCE DESIGNS Download
Synchronous Boost, Where the Output Follows the Input during Overshoot
PMP7896 — PMP7896 is a Sychronous Boost Converter with 12 Volts to 50 volts input and a output of 48 volts at 2.5 Amps continuous. The output follows the input during overshoot.
Design files
REFERENCE DESIGNS Download
Multi-Phase Boost (Step-Up) Converter
PMP7850 — PMP7850 is a Multiphase Boost (Step-Up) reference design with an input of 6 Volts to 8 volts while generating an output of 12 volts out at 17 Amps continuous and a max of 34 amps. This design is used in industrial applications.
Design files

CAD/CAE symbols

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

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