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

LM51231-Q1

ACTIVO

Controlador elevador síncrono con VIN amplia de 2.2 MHz y seguimiento de tensión de salida

Detalles del producto

Vin (min) (V) 0.8 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost Rating Automotive Vout (min) (V) 5 Vout (max) (V) 57 Features Adjustable current limit, Bypass Mode, Dynamic Voltage Scaling, Enable, Frequency synchronization, Hiccup mode protection, Improved max. duty cycle, Light Load Efficiency, Power good, Spread Spectrum, Synchronization, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 11 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
Vin (min) (V) 0.8 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost Rating Automotive Vout (min) (V) 5 Vout (max) (V) 57 Features Adjustable current limit, Bypass Mode, Dynamic Voltage Scaling, Enable, Frequency synchronization, Hiccup mode protection, Improved max. duty cycle, Light Load Efficiency, Power good, Spread Spectrum, Synchronization, Synchronous Rectification, Tracking, UVLO adjustable Iq (typ) (µA) 11 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
VQFN (RGR) 20 12.25 mm² 3.5 x 3.5
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Suited for wide operating range automotive battery powered applications
    • 3.8-V to 42-V input operating range
    • Dynamically programmable VOUT from 5 V to 20 V, or from 15 V to 57 V
    • Minimum boost input 0.8 V when BIAS ≥ 3.8 V
    • Bypass operation when VSUPPLY > VLOAD
  • BIAS shutdown current ≤ 3 µA
  • Small solution size
    • Maximum switching frequency 2.2 MHz
    • Internal boot diode
    • QFN-20 with wettable flanks
  • EMI mitigation and avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100 kHz to 2.2 MHz
    • Selectable switching mode (FPWM, diode emulation)
    • Optional programmable spread spectrum
    • Lead-less package
  • Programmability and flexibility
    • Dynamic VOUT tracking
    • Dynamic switching frequency programming
    • Supports DCR inductor current sensing
    • Programmable input voltage UVLO
    • Adjustable soft start
    • Adaptive dead-time
    • PGOOD indicator
  • Integrated protection features
    • Constant cycle-by-cycle peak current limit over VSUPPLY
    • Overvoltage protection
    • HB-SW short protection
    • Thermal shutdown
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Suited for wide operating range automotive battery powered applications
    • 3.8-V to 42-V input operating range
    • Dynamically programmable VOUT from 5 V to 20 V, or from 15 V to 57 V
    • Minimum boost input 0.8 V when BIAS ≥ 3.8 V
    • Bypass operation when VSUPPLY > VLOAD
  • BIAS shutdown current ≤ 3 µA
  • Small solution size
    • Maximum switching frequency 2.2 MHz
    • Internal boot diode
    • QFN-20 with wettable flanks
  • EMI mitigation and avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100 kHz to 2.2 MHz
    • Selectable switching mode (FPWM, diode emulation)
    • Optional programmable spread spectrum
    • Lead-less package
  • Programmability and flexibility
    • Dynamic VOUT tracking
    • Dynamic switching frequency programming
    • Supports DCR inductor current sensing
    • Programmable input voltage UVLO
    • Adjustable soft start
    • Adaptive dead-time
    • PGOOD indicator
  • Integrated protection features
    • Constant cycle-by-cycle peak current limit over VSUPPLY
    • Overvoltage protection
    • HB-SW short protection
    • Thermal shutdown

The LM51231-Q1 device is a wide input range synchronous boost controller that employs peak current mode control. The device’s wide input range supports automotive cold-crank and load dump. The minimum input voltage can be as low as 0.8 V when BIAS is equal to or greater than 3.8 V. The output voltage can be dynamically programmed by using the tracking function. Bypass mode operation is automatically entered when VSUPPLY > VLOAD, eliminating the body diode drop of the high-side MOSFET. The switching frequency is dynamically programmed with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows a small solution size and fast transient response.

The device has built-in protection features such as peak current limit, which is constant over VSUPPLY, overvoltage protection, and thermal shutdown. External clock synchronization, programmable spread spectrum modulation, and a lead-less package with minimal parasitic, help to reduce EMI and avoid cross talk. Additional features include line UVLO, FPWM, diode emulation, DCR inductor current sensing, programmable soft start, and a power-good indicator

The LM51231-Q1 device is a wide input range synchronous boost controller that employs peak current mode control. The device’s wide input range supports automotive cold-crank and load dump. The minimum input voltage can be as low as 0.8 V when BIAS is equal to or greater than 3.8 V. The output voltage can be dynamically programmed by using the tracking function. Bypass mode operation is automatically entered when VSUPPLY > VLOAD, eliminating the body diode drop of the high-side MOSFET. The switching frequency is dynamically programmed with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows a small solution size and fast transient response.

The device has built-in protection features such as peak current limit, which is constant over VSUPPLY, overvoltage protection, and thermal shutdown. External clock synchronization, programmable spread spectrum modulation, and a lead-less package with minimal parasitic, help to reduce EMI and avoid cross talk. Additional features include line UVLO, FPWM, diode emulation, DCR inductor current sensing, programmable soft start, and a power-good indicator

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Documentación técnica

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Tipo Título Fecha
* Data sheet LM51231-Q1 2.2-MHz Wide VIN Synchronous Boost Controller with VOUT Tracking datasheet PDF | HTML 24 nov 2021
Functional safety information LM51231-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 13 sep 2022

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

LM5123EVM-BST — Módulo de evaluación LM5123 del controlador elevador

El módulo de evaluación LM5123EVM‑BST muestra las características y el rendimiento del controlador elevador síncrono de tensión de entrada amplia LM5123-Q1, que incluye: La configuración estándar está diseñada para proporcionar una salida regulada de 24 V a 100 W, a partir de una tensión de entrada (...)

Guía del usuario: PDF | HTML
Modelo de simulación

LM51231-Q1 PSpice Average Model

SLVMDY8.ZIP (74 KB) - PSpice Model
Modelo de simulación

LM51231-Q1 PSpice Transient Model

SLVMDY7.ZIP (139 KB) - PSpice Model
Símbolo CAD/CAE

LM5123EVM-BST Altium CAD Files

SNVR528.ZIP (1352 KB)
Herramienta de cálculo

LM5123-Q1-DESIGNCALC — Calculadora de inicio rápido LM5123-Q1

Welcome to the quickstart design tool for LM5123-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC boost converter based on the above controller. This tool will help the user expeditiously arrive at an optimized design to meet the application (...)
Herramienta de diseño

TIDA-020033-TD-DESIGN TIDA-020033 test documentation

Productos y hardware compatibles

Productos y hardware compatibles

Productos
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Diseños de referencia

TIDA-020033 — Diseño de referencia de fuente de alimentación automotriz de seguimiento de envolvente acústico y au

Este diseño de referencia muestra un subsistema de audio de clase H con fuente de alimentación de seguimiento de envolvente acústico. El amplificador de audio TAS6584-Q1 rastrea el envolvente acústico de la entrada de audio digital y ajusta la tensión de salida de refuerzo del LM5123-Q1 para (...)
Design guide: PDF
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
VQFN (RGR) 20 Ultra Librarian

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

Soporte y capacitación

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