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LM70880-Q1

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Synchron-DC/DC-Abwärtswandler mit hoher Dichte für den Automobilbereich mit 4,5-V- bis 80-V-Eingang

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Datenblatt

LM70880-Q1

AKTIV
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Produktdetails

Rating Automotive Topology Buck Iout (max) (A) 8 Vin (max) (V) 80 Vin (min) (V) 4.5 Vout (max) (V) 55 Vout (min) (V) 0.8 Features Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Over Current Protection, Power good, Soft Start Fixed, Stackable, Thermal shutdown, UVLO adjustable EMI features Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000065 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
Rating Automotive Topology Buck Iout (max) (A) 8 Vin (max) (V) 80 Vin (min) (V) 4.5 Vout (max) (V) 55 Vout (min) (V) 0.8 Features Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Over Current Protection, Power good, Soft Start Fixed, Stackable, Thermal shutdown, UVLO adjustable EMI features Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000065 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
VQFN (RRX) 29 36 mm² (6 mm × 6 mm)
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Synchronous DC/DC converter with a versatile buck controller and robust power MOSFETs
    • Wide input voltage range: 4.5V to 80V
    • Shutdown mode current: 2.3µA
    • No-load IQ regulating 48V to 5V: 8.2µA
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 55V
    • Dual-phase operation enabling output currents up to 16A
  • Designed for low EMI requirements
    • Facilitates CISPR 25 Class 5 compliance
    • Pin-selectable ±8% dual-random spread spectrum reduces peak emissions
    • Switching frequency: 200kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
  • Inherent protection features for robust design
    • Internal hiccup-mode overcurrent protection
    • Enable, power good, and thermal shutdown
    • Internal or external loop compensation
  • 6mm × 6mm thermally optimized, RoHS compliant, QFN-29 package with Pb-free plating
  • Create a custom design using the LM708x0-Q1 with the WEBENCH Power Designer
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Synchronous DC/DC converter with a versatile buck controller and robust power MOSFETs
    • Wide input voltage range: 4.5V to 80V
    • Shutdown mode current: 2.3µA
    • No-load IQ regulating 48V to 5V: 8.2µA
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 55V
    • Dual-phase operation enabling output currents up to 16A
  • Designed for low EMI requirements
    • Facilitates CISPR 25 Class 5 compliance
    • Pin-selectable ±8% dual-random spread spectrum reduces peak emissions
    • Switching frequency: 200kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
  • Inherent protection features for robust design
    • Internal hiccup-mode overcurrent protection
    • Enable, power good, and thermal shutdown
    • Internal or external loop compensation
  • 6mm × 6mm thermally optimized, RoHS compliant, QFN-29 package with Pb-free plating
  • Create a custom design using the LM708x0-Q1 with the WEBENCH Power Designer

The LM708x0-Q1 is a family of low-IQ, wide-VIN synchronous buck converters designed for an input voltage range of 4.5V to 80V and delivering up to 8A of output current at fixed output voltages of 3.3V, 5V, 12V, or an adjustable output.

The LM708x0-Q1 uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM708x0-Q1 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 16A of output current.

The LM708x0-Q1 features a unique Dual Random Spread Spectrum (DRSS) function that combines low-frequency triangular and high-frequency cycle-by-cycle random modulations for improved EMI performance across a wide range of frequency bands.

Additional features of the LM708x0-Q1 include 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, internal 2.8ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM708x0-Q1 converter comes in a 6mm × 6mm thermally-optimized, 29-pin QFN package. The three die-attach pads (VIN, SW, and PGND) improve thermal performance and board level reliability (BLR).

The LM708x0-Q1 is a family of low-IQ, wide-VIN synchronous buck converters designed for an input voltage range of 4.5V to 80V and delivering up to 8A of output current at fixed output voltages of 3.3V, 5V, 12V, or an adjustable output.

The LM708x0-Q1 uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM708x0-Q1 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 16A of output current.

The LM708x0-Q1 features a unique Dual Random Spread Spectrum (DRSS) function that combines low-frequency triangular and high-frequency cycle-by-cycle random modulations for improved EMI performance across a wide range of frequency bands.

Additional features of the LM708x0-Q1 include 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, internal 2.8ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM708x0-Q1 converter comes in a 6mm × 6mm thermally-optimized, 29-pin QFN package. The three die-attach pads (VIN, SW, and PGND) improve thermal performance and board level reliability (BLR).
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Technische Dokumentation

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* Datenblatt LM708x0-Q1 80V, 8A/6A/4A, Automotive, High-Efficiency Buck Converters Designed for High Power Density datasheet (Rev. A) PDF | HTML 21.06.2024
Whitepaper Design Considerations for 48V Automotive Body Motor Applications PDF | HTML 17.02.2026
Anwendungshinweis Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 02.10.2024
Informationen zur funktionalen Sicherheit LM708x0-Q1 Functional Safety FIT Rate, FMD, and Pin FMA (Rev. A) PDF | HTML 27.08.2024
Anwendungshinweis Reducing Conducted EMI in a Buck Converter for 48 V Automotive Applications PDF | HTML 13.12.2023
Zertifikat LM70880QEVM EU Declaration of Conformity (DoC) 20.07.2023
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21.04.2021
Technischer Artikel Using DC/DCs buck converters to power modern safety features in commercial vehicle PDF | HTML 27.07.2020
Technischer Artikel How to meet European Commission ADAS requirements with TI DC/DC converters PDF | HTML 09.05.2019
Technischer Artikel Top three qualities to consider when designing a video doorbell power supply PDF | HTML 25.09.2018
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 05.09.2018
Whitepaper An overview of radiated EMI specifications for power supplies 05.06.2018
Technischer Artikel Effects of IC package on EMI performance PDF | HTML 22.05.2018
Whitepaper An overview of conducted EMI specifications for power supplies 01.02.2018

Design und Entwicklung

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Evaluierungsplatine

LM70880QEVM — LM70880-Q1-Evaluierungsmodul

Das High-Density-Evaluierungsmodul LM70880QEVM wurde für die Verwendung einer geregelten oder nicht geregelten Hochspannungseingangsschiene im Bereich von 8V bis 72V entwickelt, um eine streng geregelte Ausgangsspannung von 5V bei Lastströmen bis zu 8A zu erzeugen. Der LM70880-Q1 zeichnet sich (...)
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Simulationsmodell

LM70880-Q1 PSpice Transient model (Rev. A)

SNVMCD7A.ZIP (3292 KB) - PSpice-Modell
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Berechnungstool

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Dieses Referenzdesign ist eine flexible und kompakte Stromversorgung mit negativer Ausgangsspannung. Das Design enthält einen LM70880-Q1-Baustein (einen hocheffizienten 80 V-8 A-Abwärtswandler). Die Ausgangsspannung kann unter drei vordefinierten Einstellungen ausgewählt werden: - 7 V / -10 V / -11 (...)

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