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LM25119

ACTIVO

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

Detalles del producto

Rating Catalog Topology Multiphase Iout (max) (A) 40 Vin (max) (V) 42 Vin (min) (V) 4.5 Vout (max) (V) 41.3 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Duty cycle (max) (%) 98 Iq (typ) (A) 0.006 Number of phases 2 Operating temperature range (°C) -40 to 125
Rating Catalog Topology Multiphase Iout (max) (A) 40 Vin (max) (V) 42 Vin (min) (V) 4.5 Vout (max) (V) 41.3 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Duty cycle (max) (%) 98 Iq (typ) (A) 0.006 Number of phases 2 Operating temperature range (°C) -40 to 125
WQFN (RTV) 32 25 mm² (5 mm × 5 mm)
  • 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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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LM25119 Wide Input Range, Dual Synchronous Buck Controller datasheet (Rev. I) PDF | HTML 29/01/2018
Informe Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10/04/2019
Informe Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 3/07/2018
Guía de selección Power Management Guide 2018 (Rev. R) 25/06/2018
Artículo técnico How to use dual buck controllers to power PMICs in automotive applications PDF | HTML 8/11/2017
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21/07/2016
Informe Power Management IC (PMIC) Guide for Automotive (Rev. A) 29/10/2014
Más documentación LM5119 and LM25119 Design tool 26/02/2014
Analog Design Journal 1Q 2012 Issue Analog Applications Journal 31/01/2012
Analog Design Journal Benefits of a multiphase buck converter 31/01/2012

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

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) - Modelo PSpice
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Modelo de simulación

LM25119 TINA-TI Transient Reference Design (LOAD TRANSIENT)

SNVM484.TSC (154 KB) - Diseño de referencia TINA-TI
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Modelo de simulación

LM25119 TINA-TI Transient Reference Design (STARTUP)

SNVM483.TSC (224 KB) - Diseño de referencia TINA-TI
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Modelo de simulación

LM25119 TINA-TI Transient Spice Model

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

LM25119 Unencrypted PSpice Transient Model

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

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

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Diseño de referencia

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

Este convertidor buck sincrónico bifásico permite obtener componentes más pequeños con un mejor rendimiento térmico distribuido que un diseño monofásico equivalente. Logra una alta eficiencia, utiliza inductores pequeños y cabe fácilmente en una superficie de PCB pequeña de 70 mm × 70 mm.
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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
WQFN (RTV) 32 Ultra Librarian

Pedidos y calidad

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