100-V synchronous buck DC/DC controller with wide duty cycle range
Product details
Parameters
Package | Pins | Size
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
All trademarks are the property of their respective owners.
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.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LM5146-Q1 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. A) | Nov. 15, 2018 |
Selection guide | Buck Converter Quick Reference Guide (Rev. B) | Apr. 08, 2021 | |
Application note | LM5146-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution (Rev. A) | Jun. 12, 2020 | |
Technical article | How to meet European Commission ADAS requirements with TI DC/DC converters | May 09, 2019 | |
Application note | IC Package Features Lead to Higher Reliability in Automotive Systems | Feb. 20, 2019 | |
Application note | Improving RF Power Amplifier Efficiency in 5G Radio Systems | Sep. 05, 2018 | |
User guide | LM5146-Q1EVM User's Guide | Aug. 10, 2018 | |
White paper | An overview of radiated EMI specifications for power supplies | Jun. 05, 2018 | |
White paper | An overview of conducted EMI specifications for power supplies | Feb. 01, 2018 | |
Application note | 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
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
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
- (...)
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 (...)
Reference designs
Design files
-
download PMP30600 PCB.pdf (862KB) -
download PMP30600 Gerber.zip (62KB) -
download PMP30600-TH BOM.pdf (135KB) -
download PMP30600-TH Assembly Drawing.pdf (105KB) -
download PMP30600-TH CAD Files.zip (554KB)
Design files
-
download PMP30600 PCB.pdf (862KB) -
download PMP30600 Gerber.zip (62KB) -
download PMP30600-TL BOM.pdf (136KB) -
download PMP30600-TL Assembly Drawing.pdf (105KB) -
download PMP30600-TL CAD Files.zip (559KB)
Design files
-
download PMP30600 PCB.pdf (862KB) -
download PMP30600 Gerber.zip (62KB) -
download PMP30600-AL BOM.pdf (137KB) -
download PMP30600-AL Assembly Drawing.pdf (105KB) -
download PMP30600-AL CAD Files.zip (560KB)
Design files
-
download PMP30600-AH BOM.pdf (137KB) -
download PMP30600-AH Assembly Drawing.pdf (105KB) -
download PMP30600 PCB.pdf (862KB) -
download PMP30600-AH CAD Files.zip (561KB) -
download PMP30600 Gerber.zip (62KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VQFN (RGY) | 20 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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
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.