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Buck controllers (external switch)

LM5119

ACTIVE

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

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Data sheet

LM5119

ACTIVE
Data sheet Order now

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) (mA) 6 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 Control mode current mode Type Controller
Vin (min) (V) 5.5 Vin (max) (V) 65 Vout (min) (V) 0.8 Vout (max) (V) 64 Iout (max) (A) 15 Iq (typ) (mA) 6 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 Control mode current mode Type Controller
WQFN (RTV) 32 25 mm² 5 x 5
  • 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
  • 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

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.

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
* Data sheet LM5119 Wide Input Range Dual Synchronous Buck Controller datasheet (Rev. I) PDF | HTML 29 Jan 2018
Analog Design Journal Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 29 Aug 2023
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 03 Jul 2018
More literature LM5119, LM25119 Quick Start Calculator (Rev. B) 03 Feb 2017
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
Technical article Power Tips: The ground plane – a critical element in noise management of switching regulators 19 Aug 2015
Technical article Power Tips: Design considerations for a four-phase 1,200W synchronous buck – part 2 15 Jul 2015
Technical article Power Tips: Four-phase, 1.2-kW design achieves high efficiency at higher currents 10 Jun 2015
White paper Power Management IC (PMIC) Guide for Automotive (Rev. A) 29 Oct 2014
Technical article Exploiting current-mode control for wide Vin DC/DC conversion 15 Aug 2014
More literature LM5119 and LM25119 Design tool 26 Feb 2014
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
User guide AN-2065 LM5119 Evaluation Board (Rev. B) 24 Apr 2013
User guide AN-2103 LM5117 Evaluation Board (Rev. B) 24 Apr 2013
Analog Design Journal 1Q 2012 Issue Analog Applications Journal 31 Jan 2012
Analog Design Journal Benefits of a multiphase buck converter 31 Jan 2012

Design & development

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

Evaluation board

LM5119EVAL — Evaluation Board for the LM5119 Wide Vin Dual Synchronous Buck Controller

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 (...)

User guide: PDF
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Simulation model

LM5119 PSpice Transient Model

SNVM383.ZIP (227 KB) - PSpice Model
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Simulation model

LM5119 Unencrypted PSpice Transient Model

SNVM961.ZIP (4 KB) - PSpice Model
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Calculation tool

LM25119-5119QUICK-CALC — LM(2)5119 Quick Start Calculator

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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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Reference designs

PMP30464 — 96-W/180-W peak dual interleaved buck converter reference design for space constrained applications

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.
Test report: PDF
Schematic: PDF
Reference designs

PMP20804 — Quarter Brick Dual Phase Synchronous Buck Converter for Enterprise Systems Server Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP30168 — 280W Automotive Dual-Phase Synchronous Buck Reference Design with 24VDC Input, 12VDC Output

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP9227 — High Input Voltage Synchronous Buck Provides Two Independent Outputs of 28V at 2A and 16V at 4A

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).
Test report: PDF
Schematic: PDF
Reference designs

PMP10260 — 24Vdc Input (Double Car Battery) Automotive Multiphase Sync-Buck Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Package Pins Download
WQFN (RTV) 32 View options
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