LM5146-Q1

VQFN (RGY)

20

16 mm² 4.5 x 3.5

AEC-Q100 qualified for automotive applications:
- Device temperature grade 1: –40°C to +125°C ambient temperature range
Functional Safety-Capable
- Documentation available to aid functional safety system design
Versatile synchronous buck DC/DC controller
- Wide input voltage range of 5.5 V to 100 V
- 150°C maximum junction temperature
- 0.8-V reference with ±1% feedback accuracy
- Adjustable output voltage from 0.8 V to 60 V
- 40-ns t_ON(min) for high V_IN / V_OUT ratio
- 140-ns t_OFF(min) for low dropout
- Lossless R_DS(on) or shunt current sensing
- Optimized for CISPR 25 Class 5 requirements
Switching frequency from 100 kHz to 1 MHz
- SYNC In and SYNC Out capability
- Selectable diode emulation or FPWM
7.5-V gate drivers for standard V_TH MOSFETs
- 14-ns adaptive dead-time control
- 2.3-A source and 3.5-A sink capability
Inherent protection features for robust design
- Adjustable output voltage soft start
- Hiccup-mode overcurrent protection
- Input UVLO with hysteresis
- VCC and gate-drive UVLO protection
- Precision enable input and open-drain PGOOD indicator for sequencing and control
- Thermal shutdown protection with hysteresis
20-pin VQFN package with wettable flanks
Create a custom design using the LM5146-Q1 with WEBENCH Power Designer

AEC-Q100 qualified for automotive applications:
- Device temperature grade 1: –40°C to +125°C ambient temperature range
Functional Safety-Capable
- Documentation available to aid functional safety system design
Versatile synchronous buck DC/DC controller
- Wide input voltage range of 5.5 V to 100 V
- 150°C maximum junction temperature
- 0.8-V reference with ±1% feedback accuracy
- Adjustable output voltage from 0.8 V to 60 V
- 40-ns t_ON(min) for high V_IN / V_OUT ratio
- 140-ns t_OFF(min) for low dropout
- Lossless R_DS(on) or shunt current sensing
- Optimized for CISPR 25 Class 5 requirements
Switching frequency from 100 kHz to 1 MHz
- SYNC In and SYNC Out capability
- Selectable diode emulation or FPWM
7.5-V gate drivers for standard V_TH MOSFETs
- 14-ns adaptive dead-time control
- 2.3-A source and 3.5-A sink capability
Inherent protection features for robust design
- Adjustable output voltage soft start
- Hiccup-mode overcurrent protection
- Input UVLO with hysteresis
- VCC and gate-drive UVLO protection
- Precision enable input and open-drain PGOOD indicator for sequencing and control
- Thermal shutdown protection with hysteresis
20-pin VQFN package with wettable flanks
Create a custom design using the LM5146-Q1 with WEBENCH Power Designer

The LM5146-Q1 100-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5146-Q1 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance 48-V battery automotive applications, ADAS (surround view ECU) and HEV/EV systems.

Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications

The LM5146-Q1 100-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5146-Q1 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance 48-V battery automotive applications, ADAS (surround view ECU) and HEV/EV systems.

Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications

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Technical documentation

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	Type	Title	Date
*	Data sheet	LM5146-Q1 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. B)	02 Jun 2021
	Selection guide	Buck Converter Quick Reference Guide (Rev. B)	08 Apr 2021
	Functional safety information	LM5146-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution (Rev. A)	12 Jun 2020
	Technical article	How to meet European Commission ADAS requirements with TI DC/DC converters	09 May 2019
	Application note	IC Package Features Lead to Higher Reliability in Automotive Systems	20 Feb 2019
	Application note	Improving RF Power Amplifier Efficiency in 5G Radio Systems	05 Sep 2018
	User guide	LM5146-Q1EVM User's Guide	10 Aug 2018
	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 note	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

LM5146-Q1-EVM12V — Synchronous buck controller evaluation module

The LM5146-Q1-EVM12V high density evaluation module (EVM) is designed to showcase the performance of the LM5146-Q1 high performance, synchronous buck DC-DC buck controller with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a (...)

User guide

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Simulation model

LM5146-Q1 PSpice Unencrypted Transient Model (Rev. A)

SNVMBL1A.ZIP (129 KB) - PSpice Model

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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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Calculation tool

LM5146DESIGN-CALC — LM5146-Q1 synchronous buck controller quickstart design tool

Welcome to the LM5146-Q1 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the LM5146-Q1 95-V synchronous buck controller. As such, the user can expeditiously arrive at an optimized design to meet the (...)

User guide

Gerber file

LM5146-Q1 Synchronous Buck Controller Design Tool (Rev. A)

SNVC220A.ZIP (2577 KB)

PCB layout

LM5146-Q1-EVM12V PCB Layout Files

SNVR473.ZIP (7838 KB)

PCB layout

LM5145EVM-HD-20A PCB Layout Files

SNVR500.ZIP (1493 KB)

Reference designs

PMP30600-TH — 20-A automotive pre-regulator reference design with extended input voltage range for trucks

This reference design is a 100-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 100 kHz to ensure low noise operation. This IC (LM5146-Q1) is designed for automotive with the ability to handle load dump for truck applications. A (...)

Reference designs

PMP30600-TL — 10-A automotive pre-regulator reference design with extended input voltage range for trucks

This reference design is a 50-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 250 kHz to ensure low noise operation. This IC (LM5146-Q1) is designed for automotive with the ability to handle load dump for truck applications. A (...)

Reference designs

PMP30600-AL — 10-A automotive pre-regulator reference design

This reference design is a 50-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 400 kHz to ensure low noise operation. A resistor-capacitor (RC) snubber attenuates noise in the RF band to reduce radiated emissions. To reduce system EMI, (...)

Reference designs

PMP30600-AH — 20-A automotive pre-regulator reference design

This reference design is a 100-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 250 kHz to ensure low noise operation. A resistor-capacitor (RC) snubber attenuates noise in the RF band to reduce radiated emissions. To reduce system EMI, (...)