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LM70840-Q1

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Automotive, high-density, 4.5V to 80V input, 4A low-EMI synchronous DC/DC step-down converter

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Data sheet

LM70840-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 4 Vin (min) (V) 4.5 Vin (max) (V) 80 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Low Noise, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Stackable, Thermal shutdown, UVLO adjustable EMI features Spread Spectrum Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 55 Iq (typ) (µA) 6.5 Duty cycle (max) (%) 99
Rating Automotive Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 4 Vin (min) (V) 4.5 Vin (max) (V) 80 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Low Noise, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Stackable, Thermal shutdown, UVLO adjustable EMI features Spread Spectrum Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 55 Iq (typ) (µA) 6.5 Duty cycle (max) (%) 99
VQFN (RRX) 29 36 mm² 6 x 6
  • 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
  • Optimized 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 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
  • Optimized 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 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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Technical documentation

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* Data sheet LM708x0-Q1 80V, 8A/6A/4A, Automotive, High-Efficiency Buck Converters Optimized for High Power Density datasheet (Rev. A) PDF | HTML 21 Jun 2024
Application note Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 02 Oct 2024
Functional safety information LM708x0-Q1 Functional Safety FIT Rate, FMD, and Pin FMA (Rev. A) PDF | HTML 27 Aug 2024
Application note Reducing Conducted EMI in a Buck Converter for 48 V Automotive Applications PDF | HTML 13 Dec 2023
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Technical article Using DC/DCs buck converters to power modern safety features in commercial vehicle PDF | HTML 27 Jul 2020
Technical article How to meet European Commission ADAS requirements with TI DC/DC converters PDF | HTML 09 May 2019
Technical article Top three qualities to consider when designing a video doorbell power supply PDF | HTML 25 Sep 2018
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 05 Sep 2018
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
Technical article Effects of IC package on EMI performance PDF | HTML 22 May 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM706A0QEVM — LM706A0-Q1 evaluation module

The LM706A0-Q1 high-density evaluation module (EVM) is designed to use a regulated or non-regulated high-voltage input rail ranging from 8V to 65V to produce a tightly regulated output voltage of 3.3V at load currents up to 10A. This wide VIN range DC/DC solution offers outsized voltage rating and (...)

User guide: PDF | HTML
Not available on TI.com
Evaluation board

LM70880QEVM — LM70880-Q1 evaluation module

The LM70880QEVM high-density evaluation module is designed to use a regulated or non-regulated high-voltage input rail ranging from 8V to 72V to produce a tightly regulated output voltage of 5V at load currents up to 8A. The LM70880-Q1 features high conversion efficiency, superior thermal (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

LM70880-Q1 PSpice Transient model (Rev. A)

SNVMCD7A.ZIP (3292 KB) - PSpice Model
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Calculation tool

LM70XX0-CALC — LM70XX0 quickstart design tool calculator

Quickstart calculator for LM70XX0
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM704A0-Q1 — Automotive, High-density, 4.5V to 45V input, 10A low-EMI synchronous DC/DC step-down converter LM70660 — High-density, 4.5V to 65V input, 6A low-EMI synchronous DC/DC step-down converter LM706A0 — High-density, 4.5V to 65V input, 10A low-EMI synchronous DC/DC step-down converter LM706A0-Q1 — Automotive, High-density, 4.5V to 65V input, 10A low-EMI synchronous DC/DC step-down converter LM70840 — High-density, 4.5V to 80V input, 4A low-EMI synchronous DC/DC step-down converter LM70840-Q1 — Automotive, high-density, 4.5V to 80V input, 4A low-EMI synchronous DC/DC step-down converter LM70860 — High-density, 4.5V to 80V input, 6A low-EMI synchronous DC/DC step-down converter LM70860-Q1 — Automotive, high-density, 4.5V to 80V input, 6A low-EMI synchronous DC/DC step-down converter LM70880 — High-density, 4.5V to 80V input, 8A low-EMI synchronous DC/DC step-down converter LM70880-Q1 — Automotive, high-density, 4.5-V to 80-V input, 8-A low-EMI synchronous DC/DC step-down converter
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VQFN (RRX) 29 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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