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LM704A0-Q1

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Automotive, High-density, 4.5V to 45V input, 10A low-EMI synchronous DC/DC step-down converter

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Data sheet

LM704A0-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) 10 Vin (min) (V) 4.5 Vin (max) (V) 45 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, Stackable, Thermal shutdown, UVLO adjustable EMI features Spread Spectrum Control mode Current Vout (min) (V) 0.8 Vout (max) (V) 36 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) 10 Vin (min) (V) 4.5 Vin (max) (V) 45 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, Stackable, Thermal shutdown, UVLO adjustable EMI features Spread Spectrum Control mode Current Vout (min) (V) 0.8 Vout (max) (V) 36 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 45V
    • Shutdown mode current: 2.3µA
    • No-load IQ regulating 12V to 5V: 15.5µA
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 36V
    • 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 LM704A0-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 45V
    • Shutdown mode current: 2.3µA
    • No-load IQ regulating 12V to 5V: 15.5µA
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 36V
    • 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 LM704A0-Q1 with the WEBENCH Power Designer

The LM704A0-Q1 is a low-IQ, wide-VIN synchronous buck converter designed for an input voltage range of 4.5V to 45V and delivering up to 10A of output current at fixed output voltages of 3.3V, 5V, 12V, or an adjustable output.

The LM704A0-Q1 uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM704A0-Q1 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 20A of output current.

The LM704A0-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 LM704A0-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 LM704A0-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 LM704A0-Q1 is a low-IQ, wide-VIN synchronous buck converter designed for an input voltage range of 4.5V to 45V and delivering up to 10A of output current at fixed output voltages of 3.3V, 5V, 12V, or an adjustable output.

The LM704A0-Q1 uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM704A0-Q1 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 20A of output current.

The LM704A0-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 LM704A0-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 LM704A0-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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* Data sheet LM704A0-Q1 45V, 10A, Automotive, High-Efficiency Buck Converter Designed for High Power Density datasheet PDF | HTML 18 Sep 2024
Functional safety information LM704A0-Q1 Functional Safety FIT Rate, FMD, and Pin FMA PDF | HTML 07 Oct 2024

Design & development

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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 (...)

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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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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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