Product details

Vin (Min) (V) 5.5 Vin (Max) (V) 75 Vout (Min) (V) 0.8 Vout (Max) (V) 60 Iq (Typ) (uA) 1800 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Enable, Light Load Efficiency, Load Disconnect, Output Discharge, Power Good, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 150 Regulated outputs (#) 1 TI functional safety category Functional Safety-Capable Number of phases 1 Rating Automotive
Vin (Min) (V) 5.5 Vin (Max) (V) 75 Vout (Min) (V) 0.8 Vout (Max) (V) 60 Iq (Typ) (uA) 1800 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Enable, Light Load Efficiency, Load Disconnect, Output Discharge, Power Good, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 150 Regulated outputs (#) 1 TI functional safety category Functional Safety-Capable Number of phases 1 Rating Automotive
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
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 5.5 V to 75 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 tON(min) for high VIN / VOUT ratio
    • 140-ns tOFF(min) for low dropout
    • Lossless RDS(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 VTH 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 LM5145-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
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 5.5 V to 75 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 tON(min) for high VIN / VOUT ratio
    • 140-ns tOFF(min) for low dropout
    • Lossless RDS(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 VTH 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 LM5145-Q1 with WEBENCH Power Designer

The LM5145-Q1 75-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 LM5145-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-power automotive DC/DC regulators, automotive motor drives, and HEV/EV power compliant to LV-148.

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 LM5145-Q1 75-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 LM5145-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-power automotive DC/DC regulators, automotive motor drives, and HEV/EV power compliant to LV-148.

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 LM5145-Q1 Automotive 75-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. A) 08 Jun 2021
Functional safety information LM5145-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 23 Jun 2021
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
User guide LM5145EVM-HD-20A High Density Evaluation Module (Rev. A) 07 Jun 2017
Application note Creating a Dual USB Universal Car Charger From the TPS40170 and Two TPS2511 22 May 2012

Design & development

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

Evaluation board

LM5145EVM-HD-20A — LM5145 Wide VIN Synchronous Buck Controller High Density Evaluation Module

The LM5145EVM-HD-20A high density evaluation module (EVM) is designed to showcase the performance of the LM5145 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 wide (...)
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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 (...)

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Simulation model

LM5145-Q1 PSpice Unencrypted Transient Model Package

SNVMC66.ZIP (301 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 (...)
Calculation tool

LM5145DESIGN-CALC — LM5145 synchronous buck controller design tool

Welcome to the LM5145 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 LM5145 75V synchronous buck controller. As such, the user can expeditiously arrive at an optimized design to meet the (...)
PCB layout

LM5146-Q1-EVM12V PCB Layout Files

SNVR473.ZIP (7838 KB)
PCB layout

LM5145EVM-HD-20A PCB Layout Files

SNVR500.ZIP (1493 KB)
Package Pins Download
VQFN (RGY) 20 View options

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