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LM5143-Q1

ACTIVE

3.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller

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LM5143A-Q1 ACTIVE Automotive, 3.5-V to 65-V low-IQ, dual output, stackable synchronous buck DC-DC controller This product is recommended for new designs.

LM5143-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck Iout (max) (A) 40 Vin (max) (V) 65 Vin (min) (V) 3.5 Vout (max) (V) 55 Vout (min) (V) 0.6 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Multiple Outputs, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, Tracking, UVLO Fixed EMI features Spread Spectrum Duty cycle (max) (%) 99 Iq (typ) (A) 0.000015 Number of phases 4 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
Rating Automotive Topology Buck Iout (max) (A) 40 Vin (max) (V) 65 Vin (min) (V) 3.5 Vout (max) (V) 55 Vout (min) (V) 0.6 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Multiple Outputs, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, Tracking, UVLO Fixed EMI features Spread Spectrum Duty cycle (max) (%) 99 Iq (typ) (A) 0.000015 Number of phases 4 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
VQFNP (RWG) 40 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
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 65 V
    • 1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 55 V
    • 150°C maximum junction temperature
    • Shutdown mode current: 4 µA typical
    • No-load standby current: 15 µA typical
  • Two interleaved synchronous buck channels
    • Dual-channel or single-output multiphase
    • 65-ns tON(min) for high VIN/VOUT ratio
    • 60-ns tOFF(min) for low dropout
  • Inherent protection features for robust design
    • Hiccup-mode overcurrent protection
    • Independent ENABLE and PGOOD functions
    • VCC, VDDA, and gate-drive UVLO protection
    • Thermal shutdown protection with hysteresis
  • Optimized for ultra-low EMI requirements
    • Slew-rate controlled adaptive gate drivers
    • Spread spectrum reduces peak emissions
    • Optimized for CISPR 25 Class 5 requirements
  • Switching frequency from 100 kHz to 2.2 MHz
    • SYNC in and SYNC out capability
    • Selectable diode emulation or FPWM
  • VQFNP-40 pacakge with wettable flank pins
  • Create a custom design using the LM5143-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
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 65 V
    • 1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 55 V
    • 150°C maximum junction temperature
    • Shutdown mode current: 4 µA typical
    • No-load standby current: 15 µA typical
  • Two interleaved synchronous buck channels
    • Dual-channel or single-output multiphase
    • 65-ns tON(min) for high VIN/VOUT ratio
    • 60-ns tOFF(min) for low dropout
  • Inherent protection features for robust design
    • Hiccup-mode overcurrent protection
    • Independent ENABLE and PGOOD functions
    • VCC, VDDA, and gate-drive UVLO protection
    • Thermal shutdown protection with hysteresis
  • Optimized for ultra-low EMI requirements
    • Slew-rate controlled adaptive gate drivers
    • Spread spectrum reduces peak emissions
    • Optimized for CISPR 25 Class 5 requirements
  • Switching frequency from 100 kHz to 2.2 MHz
    • SYNC in and SYNC out capability
    • Selectable diode emulation or FPWM
  • VQFNP-40 pacakge with wettable flank pins
  • Create a custom design using the LM5143-Q1 with WEBENCH Power Designer

The LM5143-Q1 is a 65-V synchronous buck DC/DC controller for high-current single or dual outputs. The device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on-time of 65 ns gives large step-down ratios, enabling the direct conversion from 12-V, 24-V, or 48-Vautomotive inputs to low-voltage rails for reduced system complexity and solution cost. The LM5143-Q1 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

Current is sensed using the inductor DCR for highest efficiency or an optional shunt resistor for high accuracy. The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM5143-Q1 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.

The LM5143-Q1 is a 65-V synchronous buck DC/DC controller for high-current single or dual outputs. The device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on-time of 65 ns gives large step-down ratios, enabling the direct conversion from 12-V, 24-V, or 48-Vautomotive inputs to low-voltage rails for reduced system complexity and solution cost. The LM5143-Q1 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

Current is sensed using the inductor DCR for highest efficiency or an optional shunt resistor for high accuracy. The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM5143-Q1 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.
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Top documentation Type Title Format options Date
* Data sheet LM5143-Q1 Automotive 3.5-V to 65-V Dual Synchronous Buck Controller With Low IQ datasheet (Rev. C) PDF | HTML 02 Jun 2021
Application note Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 02 Oct 2024
Application note How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck PDF | HTML 16 Aug 2023
Functional safety information LM5143-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) PDF | HTML 09 May 2022
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Selection guide Automotive Infotainment EE Buck Converter/Controller Selection Guide (Rev. B) 15 Apr 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Technical article Powering levels of autonomy: a quick guide to DC/DC solutions for SAE autonomy lev 18 Nov 2020
Functional safety information Streamlining Functional Safety Certification in Automotive and Industrial 09 Jun 2020
White paper 簡化汽車及工業領域的功 能安全認證 09 Jun 2020
White paper 자동차 및 산업 분야의 기능적 안전성 인증 간소화 09 Jun 2020
Application note LM5143-Q1 4-phase Buck Regulator Design (Rev. A) PDF | HTML 28 Apr 2020
Technical article Powering infotainment systems of the future PDF | HTML 07 Oct 2019
Application brief IC Package Features Lead to Higher Reliability in Automotive Systems 20 Feb 2019
Technical article Searching for the newest innovations in power? Find them at APEC PDF | HTML 09 Feb 2019
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 13 Nov 2017

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