Inicio Gestión de la energía Controladores CA/CC y CC/CC (FET externo)
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Gestión de la energía
Controladores CA/CC y CC/CC (FET externo)

LM25119

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Controlador reductor síncrono doble con modo de corriente y entrada de tensión amplia de 4.5-42 V

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LM25119

ACTIVO
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Detalles del producto

Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 40 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Multiphase Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 41.3 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 6000 Duty cycle (max) (%) 98 Number of phases 2
Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 40 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Multiphase Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 41.3 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 6000 Duty cycle (max) (%) 98 Number of phases 2
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.
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Documentación técnica

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Tipo Título Fecha
* Data sheet LM25119 Wide Input Range, Dual Synchronous Buck Controller datasheet (Rev. I) PDF | HTML 29 ene 2018
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 abr 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 PDF | HTML 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 abr 2013
User guide AN-2066 LM25119 Evaluation Board (Rev. B) 24 abr 2013
User guide AN-2103 LM5117 Evaluation Board (Rev. B) 24 abr 2013
User guide AN-2112 LM25117 Evaluation Board (Rev. B) 24 abr 2013
Analog Design Journal 1Q 2012 Issue Analog Applications Journal 31 ene 2012
Analog Design Journal Benefits of a multiphase buck converter 31 ene 2012

Diseño y desarrollo

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Placa de evaluación

LM25119EVAL — Placa de evaluación LM25119 para controlador reductor síncrono doble de Vin amplia

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. (...)

Guía del usuario: PDF
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Modelo de simulación

LM25119 PSpice Transient Model

SNVM384.ZIP (227 KB) - PSpice Model
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Modelo de simulación

LM25119 TINA-TI Transient Reference Design (LOAD TRANSIENT)

SNVM484.TSC (154 KB) - TINA-TI Reference Design
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Modelo de simulación

LM25119 TINA-TI Transient Reference Design (STARTUP)

SNVM483.TSC (224 KB) - TINA-TI Reference Design
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Modelo de simulación

LM25119 TINA-TI Transient Spice Model

SNVM482.ZIP (26 KB) - TINA-TI Spice Model
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Modelo de simulación

LM25119 Unencrypted PSpice Transient Model

SNVM865.ZIP (4 KB) - PSpice Model
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Herramienta de cálculo

LM25119-5119QUICK-CALC — Calculadora de inicio rápido LM(2)5119

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Diseños de referencia

PMP20021 — Diseño de referencia de un convertidor buck sincrónico de dos fases con voltaje de entrada de 24 V (

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.
Test report: PDF
Esquema: PDF
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
WQFN (RTV) 32 Ultra Librarian
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Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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