5.5-65V Wide Vin, Current Mode Dual Synchronous Buck Controller


Product details


Vin (Min) (V) 5.5 Vin (Max) (V) 65 Vout (Min) (V) 0.8 Vout (Max) (V) 64 Iout (Max) (A) 15 Iq (Typ) (uA) 6000 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 750 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 125 Regulated outputs (#) 2 Number of Phases 2 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

WQFN (RTV) 32 25 mm² 5 x 5 open-in-new Find other Buck controllers (external switch)


  • Emulated Peak Current Mode Control
  • Wide Operating Range (5.5 V to 65 V)
  • Easily Configurable for Dual Outputs or Interleaved Single Output
  • Robust 3.3-A Peak Gate Drive
  • Switching Frequency Programmable to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch-Over to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package

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The LM5119 device is a dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. The LM5119 device drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach pad to aid thermal dissipation.

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Technical documentation

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Type Title Date
* Datasheet LM5119 Wide Input Range Dual Synchronous Buck Controller datasheet (Rev. I) Jan. 29, 2018
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) Jul. 03, 2018
Selection guide Control-Mode Quick Reference Guide (Rev. A) Sep. 14, 2017
More literature LM5119, LM25119 Quick Start Calculator (Rev. B) Feb. 03, 2017
Application note Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
Technical article Power Tips: The ground plane – a critical element in noise management of switching regulators Aug. 19, 2015
Technical article Power Tips: Design considerations for a four-phase 1,200W synchronous buck – part 2 Jul. 15, 2015
Technical article Power Tips: Four-phase, 1.2-kW design achieves high efficiency at higher currents Jun. 10, 2015
White paper Power Management IC (PMIC) Guide for Automotive (Rev. A) Oct. 29, 2014
Technical article Exploiting current-mode control for wide Vin DC/DC conversion Aug. 15, 2014
More literature LM5119 and LM25119 Design tool Feb. 26, 2014
White paper Wide VIN power management ICs simplify white paper (Rev. A) Sep. 19, 2013
User guide AN-2065 LM5119 Evaluation Board (Rev. B) Apr. 24, 2013
User guide AN-2103 LM5117 Evaluation Board (Rev. B) Apr. 24, 2013
Application note 1Q 2012 Issue Analog Applications Journal Jan. 31, 2012
Application note Benefits of a multiphase buck converter Jan. 31, 2012

Design & development

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Hardware development

document-generic User guide

The LM5119EVAL evaluation board provides the design engineer with a fully functional dual output buck converter, employing the LM5119 Dual Emulated Current Mode Synchronous Buck Controller. The evaluation board is designed to provide both 10V and 5V outputs over an input range of 14V to 55V. Also (...)

Design tools & simulation

SNVM383.ZIP (227 KB) - PSpice Model
SNVM961.ZIP (4 KB) - PSpice Model
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 (...)
  • 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
  • (...)
LM(2)5119 Quick Start Calculator

Reference designs

96-W/180-W peak dual interleaved buck converter reference design for space constrained applications
PMP30464 — This is a dual, interleaved buck converter reference design, which covers an input voltage range of 17.0 V to 60.0 V. The output voltage is 12.0 V with a maximum load current of 15.0 A. The design has been space optimized and supports an average load current of 8.0 A.
document-generic Schematic document-generic User guide
Quarter Brick Dual Phase Synchronous Buck Converter for Enterprise Systems Server Reference Design
PMP20804 — PMP20804 is a dual-phase synchronous buck converter reference design utilizing the LM5119 dual synchronous buck controller I.C. The design accepts an input voltage of 20V to 40V and provides a 12V output capable of supplying 33A of current to the load. This represents a power density design of (...)
document-generic Schematic document-generic User guide
280W Automotive Dual-Phase Synchronous Buck Reference Design with 24VDC Input, 12VDC Output
PMP30168 — This 280W two phase synchronous buck converter for automotive applications is designed for a nominal input voltage of 24V to 28V with support for cranking (down to 18V) and load dump < 58V. It provides up to 20A output current at an output voltage of 12 to 14V, which can be set externally through (...)
document-generic Schematic document-generic User guide
High Input Voltage Synchronous Buck Provides Two Independent Outputs of 28V at 2A and 16V at 4A
PMP9227 The LM5119 controller allows the user to have two separate regulated outputs or the capability to combine the outputs (of the same voltage) into a two-phase regulator. This design operates from a 36V - 51V input and regulates 28V@2A (with transients up to 7A) and 16V@4A (with transients up to 6A).
document-generic Schematic document-generic User guide
24Vdc Input (Double Car Battery) Automotive Multiphase Sync-Buck Reference Design
PMP10260 This high-efficiency, high-power reference design uses the LM5119 two-phase synchronous-buck controller to regulate 14.4V at 60A. This design can be used to supply single car battery power from a double battery system, often found in trucks. Features include input EMI filtering, output hot swap (...)
document-generic Schematic document-generic User guide
33Vin to 60Vin; 12Vout @ 30A; Dual-Phase Synchronous Buck Converter
PMP7990 A dual-phase synchronous buck converter accepting an input voltage of 33Vin to 60Vin and providing an output of 12Vout capable of supplying 30A
Design files
12V/400W Dual-Phase 1/4 Brick Buck Converter Reference Design Delivers 97% Peak Efficiency
PMP7819 This 400W ¼ brick DC/DC converter leverages the LM5119’s dual-phase capability to drive a 33A load in an industry-standard ¼ brick module footprint. This compact design delivers 97% peak efficiency while maintaining balanced current through each phase, which reduces thermal stress and enables (...)
Dual Phase Synchronous Buck (30Vout@10A)
PMP7885 — This is a dual-phase, synchronous buck converter with an input voltage range of 30.6V-to-37.4Vin and providing an output of 30Vout @ 10A.
Design files
Dual Phase Synchronous Buck
PMP7884 — This is a dual-phase, synchronous buck converter with an input voltage range of 30.6V-to-37.4Vin and an output of 9Vout @ 15A.
Design files

CAD/CAE symbols

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