LM5146-Q1

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100-V synchronous buck DC/DC controller with wide duty cycle range

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Product details

Parameters

Vin (Min) (V) 5.5 Vin (Max) (V) 100 Vout (Min) (V) 0.8 Vout (Max) (V) 60 Iout (Max) (A) 30 Iq (Typ) (mA) 1.75 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO Adjustable Operating temperature range (C) -40 to 150 Regulated outputs (#) 1 Number of Phases 1 Rating Automotive open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VQFN (RGY) 20 16 mm² 4.5 x 3.5 open-in-new Find other Buck controllers (external switch)

Features

  • AEC-Q100 Qualified for Automotive Applications:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Temperature Range
  • Versatile Synchronous Buck DC/DC Controller
    • Wide Input Voltage Range of 5.5 V to 100 V
    • Adjustable Output Voltage From 0.8 V to 60 V
    • Voltage-mode Control With Line Feedforward
  • Meets CISPR 25 EMI Standard
  • Lossless RDS(on) or Shunt Current Sensing
  • Switching Frequency From 100 kHz to 1 MHz
    • SYNC In and SYNC Out Capability
  • 40-ns Minimum On-Time for High VIN / VOUT Ratio
  • 140-ns Minimum Off-Time for Low Dropout
  • 0.8-V Reference With ±1% Feedback Accuracy
  • 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
    • Low-Side Soft Start for Prebiased Start-Up
  • Adjustable Soft Start or Optional Voltage Tracking
  • Precision Enable Input and Open-Drain Power-Good Indicator for Sequencing and Control
  • Inherent Protection Features for Robust Design
    • Hiccup-Mode Overcurrent Protection
    • Input UVLO With Hysteresis
    • VCC and Gate-Drive UVLO Protection
    • Thermal Shutdown Protection With Hysteresis
  • 20-Pin VQFN Package With Wettable Flanks
  • Create a Custom Design Using the LM5146-Q1 With WEBENCH® Power Designer

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Description

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. Measuring the voltage drop across the low-side MOSFET or with an optional current sense resistor gives cycle-by-cycle overcurrent protection. 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 voltage-mode controller with line feedforward drives external high-side and low-side N-channel power switches with robust 7.5-V gate drivers suitable for standard-threshold MOSFETs. Adaptively-timed gate drivers with 2.3-A source and 3.5-A sink capability minimize body diode conduction during switching transitions, reducing switching losses and improving thermal performance when driving MOSFETs at high input voltage and high frequency. The LM5146-Q1 can be powered from the output of the switching regulator or another available source, further improving efficiency.

A 180° out-of-phase clock output relative to the internal oscillator at SYNCOUT works well for cascaded or multi-channel power supplies to reduce input capacitor ripple current and EMI filter size. Additional features of the LM5146-Q1 include a configurable soft start, an open-drain power-good monitor for fault reporting and output monitoring, monotonic start-up into prebiased loads, integrated VCC bias supply regulator and bootstrap diode, external power supply tracking, precision enable input with hysteresis for adjustable line undervoltage lockout (UVLO), hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM5146-Q1 controller is offered in a 4.5-mm × 3.5-mm thermally enhanced, 20-pin VQFN package with additional spacing for high-voltage pins and wettable flanks for optical inspection of solder joint fillets.

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Technical documentation

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Type Title Date
* Datasheet LM5146-Q1 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. A) Nov. 15, 2018
Application notes LM5146-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution (Rev. A) Jun. 12, 2020
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
Technical articles How to meet European Commission ADAS requirements with TI DC/DC converters May 08, 2019
Application notes IC Package Features Lead to Higher Reliability in Automotive Systems Feb. 20, 2019
Application notes Improving RF Power Amplifier Efficiency in 5G Radio Systems Sep. 05, 2018
User guides LM5146-Q1EVM User's Guide Aug. 10, 2018
White papers An overview of radiated EMI specifications for power supplies Jun. 05, 2018
White papers An overview of conducted EMI specifications for power supplies Feb. 01, 2018
Application notes Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout Nov. 13, 2017

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
75
Description

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 wide (...)

Features
  • 15-V to 85-V input voltage range
  • 12-V output voltage with 1% setpoint accuracy
  • Rated for up to 8 A of load current
  • 400-kHz switching frequency
  • Resistor divider to EN/UVLO to faciltate programmable input voltage UVLO
  • Fully assembled, tested and proven PCB layout with small footprint

Design tools & simulation

SIMULATION MODELS Download
SNVMBL1A.ZIP (129 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOLS Download
LM5146-Q1 synchronous buck controller quickstart design tool
LM5146DESIGN-CALC — 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 (...)
document-generic User guide
Features
  • Determine output filter inductance and input and output capacitances
  • Select components for soft-start, input UVLO, OCP and output voltage setpoint
  • Optimize compensation values and pole/zero placement in terms of control loop stability using crossover frequency as a performance metric
  • Inspect regulator (...)
GERBER FILES Download
SNVC220A.ZIP (2577 KB)
PCB LAYOUTS Download
SNVR473.ZIP (7838 KB)

Reference designs

REFERENCE DESIGNS Download
20-A automotive pre-regulator reference design with extended input voltage range for trucks
PMP30600-TH — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
10-A automotive pre-regulator reference design with extended input voltage range for trucks
PMP30600-TL — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
10-A automotive pre-regulator reference design
PMP30600-AL — 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, the (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
20-A automotive pre-regulator reference design
PMP30600-AH — 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, the (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RGY) 20 View options

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