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LM517701

ACTIVO

Controlador buck-boost bidireccional de 4 interruptores y VIN amplia de 78 V

Detalles del producto

Rating Catalog Topology Buck-Boost Vin (max) (V) 78 Vin (min) (V) 2.8 Vout (max) (V) 78 Vout (min) (V) 3.3 Features Adjustable current limit, Dynamic voltage scaling, Enable, Frequency synchronization, Light-load efficiency, Load Disconnect, Power good, Spread Spectrum, Synchronous rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 60 Duty cycle (max) (%) 100 EMI features Frequency Dithering, Spread Spectrum
Rating Catalog Topology Buck-Boost Vin (max) (V) 78 Vin (min) (V) 2.8 Vout (max) (V) 78 Vout (min) (V) 3.3 Features Adjustable current limit, Dynamic voltage scaling, Enable, Frequency synchronization, Light-load efficiency, Load Disconnect, Power good, Spread Spectrum, Synchronous rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 60 Duty cycle (max) (%) 100 EMI features Frequency Dithering, Spread Spectrum
HTSSOP (DCP) 38 62.08 mm² 9.7 x 6.4
  • Wide input range from 3.5V to 78V (85V absolute maximum)
    • Minimum 2.8V when V(BIAS) > 3.5V
  • Output voltage from 3.3V to 78V
  • Low shutdown IQ of 3µA
  • Low operating IQ of 60µA
  • 3% reverse current limit accuracy for precise charging currents
  • Average input and output current monitor or limiter
  • Dynamic output voltage tracking for PWM or analog input signals
  • Power save mode (PSM) selectable for high light load efficiency
  • Two integrated high-voltage supply LDOs with automatic selection
  • Fixed frequency across all operating modes (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching up to 1.8MHz for small solution and component size
    • External clock synchronization
  • Spread spectrum operation selectable
  • Adjustable undervoltage protection
  • Hiccup overcurrent and short protection
  • Wide input range from 3.5V to 78V (85V absolute maximum)
    • Minimum 2.8V when V(BIAS) > 3.5V
  • Output voltage from 3.3V to 78V
  • Low shutdown IQ of 3µA
  • Low operating IQ of 60µA
  • 3% reverse current limit accuracy for precise charging currents
  • Average input and output current monitor or limiter
  • Dynamic output voltage tracking for PWM or analog input signals
  • Power save mode (PSM) selectable for high light load efficiency
  • Two integrated high-voltage supply LDOs with automatic selection
  • Fixed frequency across all operating modes (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching up to 1.8MHz for small solution and component size
    • External clock synchronization
  • Spread spectrum operation selectable
  • Adjustable undervoltage protection
  • Hiccup overcurrent and short protection

The LM51770x is a four switch buck-boost controller. The device provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports high efficiency with low output loads due to its low quiescence currents. In power save mode, the device supports high efficiency close to 99% efficiency over the full range of the output current. The LM51770x runs at a fixed switching frequency, which is set through the RT or SYNC pin. The switching frequency remains the same during buck, boost, and buck-boost operation. The integrated and optional average current monitor helps monitor and limit input and output current of the LM51770x. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).

The LM51770x is a four switch buck-boost controller. The device provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports high efficiency with low output loads due to its low quiescence currents. In power save mode, the device supports high efficiency close to 99% efficiency over the full range of the output current. The LM51770x runs at a fixed switching frequency, which is set through the RT or SYNC pin. The switching frequency remains the same during buck, boost, and buck-boost operation. The integrated and optional average current monitor helps monitor and limit input and output current of the LM51770x. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).

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Documentación técnica

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Tipo Título Fecha
* Data sheet LM51770x 78V Wide VIN Bidirectional 4-Switch Buck-Boost Controller datasheet (Rev. A) PDF | HTML 20 ago 2025

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

LM5177EVM-HP — Módulo de evaluación LM5177 con controlador reductor-elevador de cuatro interruptores

El LM5177EVM-HP demuestra un diseño flexible de reductor-elevador de alta alimentación que utiliza el controlador reductor-elevador LM5177 de amplia alimentación. El módulo de evaluación está configurado para funcionar con un rango de tensión de entrada de 4.2 V a 36 V y proporcionar una salida (...)
Guía del usuario: PDF | HTML
Herramienta de cálculo

LM51770-QUICKSTART-CALC LM51770 BuckBoost Quickstart Calculator Tool

LM51770 BuckBoost Quickstart Calculator Tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck-boost converter based on the LM51770.
Productos y hardware compatibles

Productos y hardware compatibles

Productos
Controladores CA/CC y CC/CC (FET externo)
LM51770 Controlador buck-boost bidireccional de 4 interruptores y VIN amplia de 78 V LM51770-Q1 Controlador buck-boost bidireccional de 4 interruptores y VIN amplia de 78 V LM517701 Controlador buck-boost bidireccional de 4 interruptores y VIN amplia de 78 V
Desarrollo de hardware
Placa de evaluación
LM51770EVM-HV Módulo de evaluación controlador buck-boost LM51770
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
HTSSOP (DCP) 38 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

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