Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 41.3 Iout (Max) (A) 40 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
Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 41.3 Iout (Max) (A) 40 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
WQFN (RTV) 32 25 mm² 5 x 5
  • Emulated Peak Current Mode Control
  • Wide Operating Range (4.5 V to 42 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 Switchover to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package
  • Emulated Peak Current Mode Control
  • Wide Operating Range (4.5 V to 42 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 Switchover to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package

The LM25119 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 LM25119 device drives external high-side and low-side N-channel MOS 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 LM25119 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 LM25119 device drives external high-side and low-side N-channel MOS 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.

Download

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 15
Type Title Date
* Data sheet LM25119 Wide Input Range, Dual Synchronous Buck Controller datasheet (Rev. I) 29 Jan 2018
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
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article How to use dual buck controllers to power PMICs in automotive applications 08 Nov 2017
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
White paper Power Management IC (PMIC) Guide for Automotive (Rev. A) 29 Oct 2014
More literature LM5119 and LM25119 Design tool 26 Feb 2014
User guide AN-2065 LM5119 Evaluation Board (Rev. B) 24 Apr 2013
User guide AN-2066 LM25119 Evaluation Board (Rev. B) 24 Apr 2013
User guide AN-2103 LM5117 Evaluation Board (Rev. B) 24 Apr 2013
User guide AN-2112 LM25117 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

LM25119EVAL — Evaluation Board for the LM25119 Wide Vin Dual Synchronous Buck Controller

The LM25119EVAL evaluation board provides the design engineer with a fully functional dual output buck converter, employing the LM25119 Dual Emulated Current Mode Synchronous Buck Controller. The evaluation board is designed to provide both 3.3V and 1.8V outputs over an input range of 6.0V to 36V. (...)

In stock
Limit: 3
Simulation model

LM25119 PSpice Transient Model

SNVM384.ZIP (227 KB) - PSpice Model
Simulation model

LM25119 TINA-TI Transient Spice Model

SNVM482.ZIP (26 KB) - TINA-TI Spice Model
Simulation model

LM25119 TINA-TI Transient Reference Design (STARTUP)

SNVM483.TSC (224 KB) - TINA-TI Reference Design
Simulation model

LM25119 TINA-TI Transient Reference Design (LOAD TRANSIENT)

SNVM484.TSC (154 KB) - TINA-TI Reference Design
Simulation model

LM25119 Unencrypted PSpice Transient Model

SNVM865.ZIP (4 KB) - PSpice Model
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 (...)
Calculation tool

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

Reference designs

PMP10664 — 35W Dual Output Buck for Industrial Application Reference Design

The PMP10664 reference design is a 35W dual-output synchronous buck converter using the LM25119 controller IC.  The design accepts an input voltage of 9.8Vin to 15.1Vin, provides one output of 3.3V capable of supplying 6.5A of current and one output of 3.3V capable of supplying 4A of (...)
Reference designs

PMP20021 — 24V Input Voltage Two Phase Synchronous Buck Converter (12V@20A) Reference Design

This two phase synchronous buck converter allows smaller components with better distributed thermal performance than an equivalent single phase design. It achieves high efficiency, uses small inductors and easily fits in a small PCB area of 70mm x 70mm.
Reference designs

TIDA-00630 — TI USB Type-C Dock Reference Design

The Type-C Dock Board is designed to help evaluate Type-C Dock implementations with video and charging support.  The Type-C Dock offers data and video port expansion and a charging capability for Type-C systems that support USB PD/Alternate mode protocol.  The dock comes with three (...)
Reference designs

PMP9700 — Reference Design - High Efficiency Two-Phase Synchronous Buck Delivers 300W

This two-phase synchronous buck operates from 24VDC and supplies an output of 15V@20A. Operation at 300KHz (per phase) delivers small size and greater than 96% efficiency.
Reference designs

PMP7877 — Power Reference Design for Xilinx® Zynq®-7000

The PMP7877 reference design provides all the rails necessary to power a Xilinx® Zynq®-7000 series SoC.  It operates from an input voltage range of 10.8Vin to 13.2Vin and has seven regulated outputs: 1Vout @ 5A, 1.8Vout @ 2.5A, 1.5Vout @ 6A, 3.3Vout @ 5A, 3.3Vout @ 5A, 5Vout @ 2A, and (...)
Package Pins Download
WQFN (RTV) 32 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos