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LM70880-Q1

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Automotive, high-density, 4.5-V to 80-V input, 8-A low-EMI synchronous DC/DC step-down converter

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Data sheet

LM70880-Q1

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Data sheet Order now

Product details

Iout (max) (A) 8 Vin (min) (V) 4.5 Vin (max) (V) 80 Type DC/DC converter 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 Control mode Peak-Current Vout (min) (V) 0.8 Vout (max) (V) 55 Rating Automotive Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000065
Iout (max) (A) 8 Vin (min) (V) 4.5 Vin (max) (V) 80 Type DC/DC converter 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 Control mode Peak-Current Vout (min) (V) 0.8 Vout (max) (V) 55 Rating Automotive Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000065
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
  • Synchronous DC/DC converter with a versatile buck controller and robust power MOSFETs
    • Wide input voltage range: 4.5 V to 80 V
    • 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable outputs from 0.8 V to 55 V
    • Dual-phase control enables paralleling two devices for higher current applications
    • Shutdown mode current: 2.3 µA
    • No-load sleep current: 6.5 µA
  • Optimized for low EMI requirements
    • Facilitates CISPR 25 Class 5 compliance
    • Pin-selectable ±8% dual-random spread spectrum reduces peak emissions
    • Switching frequency: 200 kHz to 2.2 MHz
    • 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
  • 6-mm × 6-mm thermally optimized, RoHS compliant, QFN-29 package with Pb-Free plating
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Synchronous DC/DC converter with a versatile buck controller and robust power MOSFETs
    • Wide input voltage range: 4.5 V to 80 V
    • 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable outputs from 0.8 V to 55 V
    • Dual-phase control enables paralleling two devices for higher current applications
    • Shutdown mode current: 2.3 µA
    • No-load sleep current: 6.5 µA
  • Optimized for low EMI requirements
    • Facilitates CISPR 25 Class 5 compliance
    • Pin-selectable ±8% dual-random spread spectrum reduces peak emissions
    • Switching frequency: 200 kHz to 2.2 MHz
    • 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
  • 6-mm × 6-mm thermally optimized, RoHS compliant, QFN-29 package with Pb-Free plating

The LM70880-Q1 is a compact, easy-to-use, 4.5-V to 80-V, ultra-low I Q, synchronous step-down DC/DC converter featuring a versatile buck controller and a pair of power MOSFETs designed for delivering of up to 8 A of output current at fixed output voltages of 3.3 V, 5 V, 12 V, or an adjustable output.

The converter uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM70880-Q1 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 16 A of output current.

The LM70880-Q1 features a unique Dual Random Spread Spectrum (DRSS) function that combines a low-frequency triangular modulation with a high-frequency cycle-by-cycle random modulation for improved EMI performance across a high range of radio frequency bands.

Additional features of the LM70880-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 2.75-ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM70880-Q1 converter comes in a 6-mm × 6-mm thermally-optimized, 29-pin QFN package. The three die-attach pads (VIN, SW, and PGND) improve thermal performance and board level reliability (BLR).

The LM70880-Q1 is a compact, easy-to-use, 4.5-V to 80-V, ultra-low I Q, synchronous step-down DC/DC converter featuring a versatile buck controller and a pair of power MOSFETs designed for delivering of up to 8 A of output current at fixed output voltages of 3.3 V, 5 V, 12 V, or an adjustable output.

The converter uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM70880-Q1 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 16 A of output current.

The LM70880-Q1 features a unique Dual Random Spread Spectrum (DRSS) function that combines a low-frequency triangular modulation with a high-frequency cycle-by-cycle random modulation for improved EMI performance across a high range of radio frequency bands.

Additional features of the LM70880-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 2.75-ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM70880-Q1 converter comes in a 6-mm × 6-mm 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 80-V, 8-A/6-A/4-A, Automotive, High-Efficiency Buck Converters Optimized for High Power Density datasheet PDF | HTML 06 Sep 2023
EVM User's guide LM70880-Q1 Buck Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 06 Mar 2024
Certificate LM70880QEVM EU Declaration of Conformity (DoC) 20 Jul 2023

Design & development

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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
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Reference designs

PMP31291 — 27W inverting buck-boost reference design

This reference design is a flexible and compact power supply providing a negative output voltage rail. The design includes a LM70880-Q1 device (a 80V, 8A high efficiency buck converter). The output voltage value can be selected among three predefined settings: - 7 V / -10 V / -11 V.
Test report: PDF
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VQFN (RRX) 29 View options
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