Home Power management DC/DC switching regulators DC/DC controllers
Home
Power management
DC/DC switching regulators
DC/DC controllers

LM25143-Q1

ACTIVE

Automotive, 3.5-V to 42-V low-Iq, dual output, stackable synchronous buck DC-DC controller

Order now
Data sheet

LM25143-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck Controller Iout (max) (A) 100 Vin (max) (V) 42 Vin (min) (V) 3.5 Vout (max) (V) 36 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, UVLO adjustable EMI features Spread Spectrum Duty cycle (max) (%) 99 Iq (typ) (A) 0.000015 Number of phases 2 Operating temperature range (°C) -40 to 150
Rating Automotive Topology Buck Controller Iout (max) (A) 100 Vin (max) (V) 42 Vin (min) (V) 3.5 Vout (max) (V) 36 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, UVLO adjustable EMI features Spread Spectrum Duty cycle (max) (%) 99 Iq (typ) (A) 0.000015 Number of phases 2 Operating temperature range (°C) -40 to 150
VQFN (RHA) 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 42 V
    • 1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 36 V
    • 150°C maximum junction temperature
    • 3.3-µA typical shutdown mode current
    • 15-µA typical no-load standby current
  • 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
    • Adjustable output voltage soft start
    • VCC, VDDA, and gate-drive UVLO protection
    • Thermal shutdown protection with hysteresis
  • Optimized for CISPR 25 class 5EMI requirements
    • Slew-rate controlled adaptive gate drivers
    • Spread spectrum reduces peak emissions
  • 100-kHz to 2.2-MHz switching frequency
    • SYNC in and SYNC out capability
    • Selectable diode emulation or FPWM modes
  • VQFN-40 package with wettable flank pins
  • Create a custom design using the LM25143-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 42 V
    • 1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 36 V
    • 150°C maximum junction temperature
    • 3.3-µA typical shutdown mode current
    • 15-µA typical no-load standby current
  • 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
    • Adjustable output voltage soft start
    • VCC, VDDA, and gate-drive UVLO protection
    • Thermal shutdown protection with hysteresis
  • Optimized for CISPR 25 class 5EMI requirements
    • Slew-rate controlled adaptive gate drivers
    • Spread spectrum reduces peak emissions
  • 100-kHz to 2.2-MHz switching frequency
    • SYNC in and SYNC out capability
    • Selectable diode emulation or FPWM modes
  • VQFN-40 package with wettable flank pins
  • Create a custom design using the LM25143-Q1 with WEBENCH Power Designer

The LM25143-Q1 is a 42-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VIN range controllers, 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 provides large step-down ratios, enabling the direct conversion from 12-V or 24-V automotive inputs to low-voltage rails for reduced system complexity and cost. The LM25143-Q1 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered automotive systems. Power the LM25143-Q1 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.

The LM25143-Q1 is a 42-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VIN range controllers, 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 provides large step-down ratios, enabling the direct conversion from 12-V or 24-V automotive inputs to low-voltage rails for reduced system complexity and cost. The LM25143-Q1 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered automotive systems. Power the LM25143-Q1 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.
filter Find other DC/DC controllers
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Pin-for-pin with same functionality to the compared device
LM5143A-Q1 ACTIVE Automotive, 3.5-V to 65-V low-IQ, dual output, stackable synchronous buck DC-DC controller Higher VIN alternative product.
Same functionality with different pin-out to the compared device
LM25148-Q1 ACTIVE Automotive 42-V synchronous buck DC/DC controller with ultra-low IQ Single output stackable to two phases
LM25149-Q1 ACTIVE 42-V automotive synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter Single output stackable to two phases with active EMI filter

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 5
Top documentation Type Title Format options Date
* Data sheet LM25143-Q1 Automotive 3.5-V to 42-V Dual Synchronous Buck Controller With Low IQ datasheet PDF | HTML 20 May 2022
Application note How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck PDF | HTML 16 Aug 2023
Functional safety information LM25143-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 09 May 2022
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Application note LM5143-Q1 4-phase Buck Regulator Design (Rev. A) PDF | HTML 28 Apr 2020

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

LM25143-Q1 PSpice Transient Model

SNVMCA4.ZIP (336 KB) - PSpice Model
Download
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
Download
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

PMP31202 — Four-phase buck converter 700-W reference design

This reference design is a 700-W buck converter using the LM5143A-Q1 device. Due to low dead times, ultra-strong drivers and the ability to adjust the rising and falling edges individually, the resulting efficiency is 98%. Because of reduced loss, the board area measures 150 mm × 125 mm, with a (...)
Test report: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RHA) 40 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos