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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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Data sheet

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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

Vin (min) (V) 3.5 Vin (max) (V) 65 Iout (max) (A) 100 Operating temperature range (°C) -40 to 150 Control mode current mode Topology Buck Rating Automotive Vout (min) (V) 0.6 Vout (max) (V) 55 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 Iq (typ) (µA) 15 Duty cycle (max) (%) 99 Number of phases 2 TI functional safety category Functional Safety-Capable
Vin (min) (V) 3.5 Vin (max) (V) 65 Iout (max) (A) 100 Operating temperature range (°C) -40 to 150 Control mode current mode Topology Buck Rating Automotive Vout (min) (V) 0.6 Vout (max) (V) 55 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 Iq (typ) (µA) 15 Duty cycle (max) (%) 99 Number of phases 2 TI functional safety category Functional Safety-Capable
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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Technical documentation

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Type Title 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

Design & development

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

Evaluation board

LM5143-Q1EVM-2100 — Dual-channel automotive synchronous buck controller evaluation module

The LM5143-Q1-EVM2100 high density evaluation module (EVM) is designed to showcase the performance of the LM5143-Q1 high performance, dual-channel, automotive synchronous buck DC/DC buck controller. It operates over a wide input voltage range of 3.5 V to 36 V to deliver fixed 5-V and 3.3-V outputs (...)
User guide: PDF
Not available on TI.com
Simulation model

LM5143-Q1 PSpice Transient Model

SNVMBN0.ZIP (150 KB) - PSpice Model
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Calculation tool

LM5143DESIGN-CALC — LM5143-Q1 Controller Quickstart Design Tool

This stand-alone tool facilitates and assists with the design of a DC/DC buck regulator based on the LM5143-Q1 synchronous buck DC/DC controller with low IQ. The user can expeditiously arrive at an optimized design to meet the application requirements.

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM25143 — 3.5-V to 42-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ LM25143-Q1 — Automotive, 3.5-V to 42-V low-Iq, dual output, stackable synchronous buck DC-DC controller LM5143 — 3.5-V to 65-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ LM5143-Q1 — 3.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller LM5143A-Q1 — Automotive, 3.5-V to 65-V low-IQ, dual output, stackable synchronous buck DC-DC controller
Hardware development
Evaluation board
LM5143-Q1EVM-2100 — Dual-channel automotive synchronous buck controller evaluation module
Software
Calculation tool
LM5143DESIGN-CALC — LM5143-Q1, LM5143A-Q1, LM5143, LM25143-Q1 and LM25143 controller quick start design tool
Download
PCB layout

LM5143-Q1 PCB Source Files

SNVR474.ZIP (2613 KB)
Download
Reference designs

PMP23468 — 48V input, 875W peak power, multiphase buck converter reference design for audio systems

This reference design provides protection and power for automotive audio systems. Operation with a 48VDC input was tested across the full output voltage range: 6VDC to 35VDC. The design exhibits a peak efficiency of 97% at nominal load, and no significant output voltage undershoot and overshoot for (...)
Test report: PDF
Reference designs

PMP23380 — Automotive 24VIN to 60VIN, 60A two-phase converter reference design

This reference design offers power for automotive advanced driver assistance systems (ADAS), infotainment and cluster applications. Operation is over the full automotive range including battery voltage surges to 60-V. The design exhibits a peak conversion efficiency of 93% to 96% in the 24-VIN to (...)
Test report: PDF
Reference designs

PMP23404 — 24-VIN to 60-VIN, 300-W automotive two-phase converter reference design

This reference design offers power for automotive advanced driver assistance systems (ADAS), infotainment and cluster applications. Operation is over the full automotive range including battery voltage surges to 60 V. The design exhibits a peak conversion efficiency of 93% to 96% in the 24-VIN to (...)
Test report: PDF
Reference designs

PMP23262 — 200-W automotive two-phase synchronous buck converter reference design

This reference design provides power for Automotive Advanced Driver Assistance System (ADAS) designs, and infotainment and cluster applications. Operation for automotive applications include battery voltage surges to 32 V and dips to 6 V due to cold cranking. Peak conversion efficiency of 94 % to (...)
Test report: PDF
Reference designs

PMP31210 — 700-W, four-phase buck converter reference design with extended input voltage range

This reference design is a 700-W buck converter using the LM5143A-Q1 device. Due to low dead times, strong drivers and the ability to adjust the rising and falling edges individually, the resulting efficiency is 98%. Board area is minimized because of reduced loss. It is 150 mm × 125 mm with a low (...)
Test report: PDF
Reference designs

PMP30670 — Automotive wide VIN front-end reference design for digital cockpit processing units

This reference design shows a power tree for automotive digital cockpit applications. The LM74700-Q1 provides low-loss reverse polarity protection to the system followed by an input filter. The LM5143-Q1 dual-synchronous buck converter provides a 3.3-V rail, which can support up to 15 A for a (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
VQFNP (RWG) 40 Ultra Librarian
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