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LM5149

AKTIV

Synchroner DC/DC-Abwärtscontroller mit 80 V, extrem niedrigem IQ und integriertem aktivem EMI-Filter

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Datenblatt

LM5149

AKTIV
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Produktdetails

Rating Catalog Topology Buck Iout (max) (A) 20 Vin (max) (V) 80 Vin (min) (V) 3.5 Vout (max) (V) 55 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Synchronous Rectification, UVLO adjustable EMI features Active EMI filter, Spread Spectrum Duty cycle (max) (%) 99 Iq (typ) (A) 0.0000095 Number of phases 2 Operating temperature range (°C) -40 to 150
Rating Catalog Topology Buck Iout (max) (A) 20 Vin (max) (V) 80 Vin (min) (V) 3.5 Vout (max) (V) 55 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Synchronous Rectification, UVLO adjustable EMI features Active EMI filter, Spread Spectrum Duty cycle (max) (%) 99 Iq (typ) (A) 0.0000095 Number of phases 2 Operating temperature range (°C) -40 to 150
VQFN (RGY) 24 19.25 mm² (5.5 mm × 3.5 mm)
  • Functional Safety-Capable
  • Two integrated EMI mitigation mechanisms
    • Active EMI Filter for enhanced EMI performance at lower frequencies
    • Selectable dual random spread spectrum (DRSS) for enhanced EMI performance across low and high-frequency bands
    • EMI reduced by an average of 25 dBµV
    • Reduces the external differential-mode input filter size by 50% and lowers systems cost
    • Optimized for CISPR 32 Class B requirements
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 80 V
    • 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V
    • 150°C maximum junction temperature
    • Shutdown mode current: 2.3 µA
    • No-load sleep current: 9.5 µA
    • Stackable up to two phases
    • Advanced dropout with frequency foldback
  • Switching frequency from 100 kHz to 2.2 MHz
    • SYNC in and SYNC out capability
  • Inherent protection features for robust design
    • Internal hiccup-mode overcurrent protection
    • ENABLE and PGOOD functions
    • VCC, VDDA, and gate-drive UVLO protection
    • Internal or external loop compensation
    • Thermal shutdown protection with hysteresis
  • Create a custom design using the LM5149 with WEBENCH Power Designer
  • Functional Safety-Capable
  • Two integrated EMI mitigation mechanisms
    • Active EMI Filter for enhanced EMI performance at lower frequencies
    • Selectable dual random spread spectrum (DRSS) for enhanced EMI performance across low and high-frequency bands
    • EMI reduced by an average of 25 dBµV
    • Reduces the external differential-mode input filter size by 50% and lowers systems cost
    • Optimized for CISPR 32 Class B requirements
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 80 V
    • 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V
    • 150°C maximum junction temperature
    • Shutdown mode current: 2.3 µA
    • No-load sleep current: 9.5 µA
    • Stackable up to two phases
    • Advanced dropout with frequency foldback
  • Switching frequency from 100 kHz to 2.2 MHz
    • SYNC in and SYNC out capability
  • Inherent protection features for robust design
    • Internal hiccup-mode overcurrent protection
    • ENABLE and PGOOD functions
    • VCC, VDDA, and gate-drive UVLO protection
    • Internal or external loop compensation
    • Thermal shutdown protection with hysteresis
  • Create a custom design using the LM5149 with WEBENCH Power Designer

The LM5149 is a 80-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM5149 can be set up in interleaved dual-phase mode with accurate current sharing for high-current applications. The device can operate with VIN as low as 3.5 V, at nearly 100% duty cycle if needed.

The LM5149 has two unique EMI reduction features: active EMI filter and dual random spread spectrum (DRSS). The active EMI filter senses any noise or ripple voltage on the DC input bus and injects an out-of-phase cancellation signal to reduce the disturbance. DRSS combines low-frequency triangular and high-frequency randomized modulations to mitigate EMI across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.

Additional features of the LM5149 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator and bootstrap diode, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM5149- controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with an exposed pad to aid in thermal dissapation.

The LM5149 is a 80-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM5149 can be set up in interleaved dual-phase mode with accurate current sharing for high-current applications. The device can operate with VIN as low as 3.5 V, at nearly 100% duty cycle if needed.

The LM5149 has two unique EMI reduction features: active EMI filter and dual random spread spectrum (DRSS). The active EMI filter senses any noise or ripple voltage on the DC input bus and injects an out-of-phase cancellation signal to reduce the disturbance. DRSS combines low-frequency triangular and high-frequency randomized modulations to mitigate EMI across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.

Additional features of the LM5149 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator and bootstrap diode, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM5149- controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with an exposed pad to aid in thermal dissapation.
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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LM5149 80-V, Synchronous, Buck, DC/DC Controller with Ultra-Low IQ and Integrated Active EMI Filter datasheet (Rev. A) PDF | HTML 24.01.2023
Anwendungshinweis Power Supply Designs for eBike That Meet the New GB42295 National Standard 10.07.2025
Anwendungshinweis Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 02.10.2024
Anwendungshinweis How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck PDF | HTML 16.08.2023
Informationen zur funktionalen Sicherheit LM5149 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 16.12.2022
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21.04.2021

Design und Entwicklung

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Evaluierungsplatine

LM25149-Q1EVM-2100 — LM25149-Q1 Synchroner DC/DC-Abwärtsregler (5,5 bis 36 V) mit niedrigem Ruhestrom – Evaluierungsmodul

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Evaluierungsplatine

LM5149-Q1EVM-400 — LM5149-Q1 Evaluierungsmodul, synchroner DC/DC-Abwärtsregler, 72 V, niedriger IQ, mit aktivem EMI-Fil

Das kompakte Evaluierungsmodul (EVM) LM5149-Q1EVM-400 wurde dafür entwickelt, die Leistung des hochleistungsfähigen synchronen DC/DC-Abwärtscontrollers LM5149-Q1 für die Automobilindustrie zu demonstrieren. Das EVM arbeitet über einen großen Eingangsspannungsbereich von 15 V bis 72 V, um einen (...)

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Simulationsmodell

LM5149-Q1 PSPICE Transient Model

SNVMCB8.ZIP (87 KB) - PSpice-Modell
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Berechnungstool

LM5149-LM25149DESIGN-CALC — AEF-Schnellstart-Designtool für Abwärts-Controller LM5149/-Q1 und LM25149/-Q1

Willkommen beim Schnellstart-Designtool für die Modelle LM5149, LM5149-Q1 und LM25149, LM25149-Q1. Dieses eigenständige Tool unterstützt Stromversorgungsingenieure und ermöglicht diesen das Design eines DC/DC-Abwärtsreglers basierend auf der oben genannten Controller-Familie. Somit kann der (...)
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