Wide-Input 2.2MHz Low-Iq Synchronous Buck Controller


Product details


Vin (Min) (V) 3.8 Vin (Max) (V) 65 Vout (Min) (V) 1.5 Vout (Max) (V) 15 Iout (Max) (A) 30 Iq (Typ) (uA) 35 Switching frequency (Min) (kHz) 350 Switching frequency (Max) (kHz) 2600 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Power Good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, Tracking, UVLO Fixed Operating temperature range (C) -40 to 150 Regulated outputs (#) 1 TI functional safety category Functional Safety-Capable Number of Phases 1 Rating Automotive open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VQFN (RGE) 24 16 mm² 4 x 4 open-in-new Find other Buck controllers (external switch)


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • VIN: 3.8 V to 65 V (70 V Absolute Maximum)
  • Output: Fixed 3.3 V, 5 V, or Adjustable From
    1.5 V to 15 V with ±0.8% Accuracy
  • Fixed 2.2-MHz or 440-kHz Switching Frequency with ±5% Accuracy
  • High-Side and Low-Side Gate Drive With Slew-Rate Control
  • Optional Frequency Shift by Varying an Analog Voltage or RT Resistor
  • Optional Synchronization to an External Clock
  • Optional Spread Spectrum
  • Shutdown Mode IQ: 10 µA Typical
  • Low Standby Mode IQ: 35 µA Typical
  • 75-mV Current Limit Threshold with ±0.9% Accuracy
  • External Resistor or DCR Current Sensing
  • Output Enable Logic Input
  • Hiccup Mode for Sustained Overload
  • Power-Good Indication Output
  • Selectable Diode Emulation or Forced Pulse-Width Modulation
  • 24-pin VQFN Package With Wettable Flanks
  • Create a Custom Design Using the LM5141-Q1 With the WEBENCH® Power Designer

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The LM5141-Q1 is a synchronous buck controller, intended for high voltage wide VIN step-down converter applications. The control method is peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease-of-loop compensation. The LM5141-Q1 features slew rate control to simplify the compliance with CISPR and automotive EMI requirements.

The LM5141-Q1 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate drivers with slew rate Control that can be adjusted to reduce EMI.

In light or no-load conditions, the LM5141-Q1 operates in skip cycle mode for improved low power efficiency. The LM5141-Q1 has a high voltage bias regulator with automatic switch-over to an external bias to reduce the IQ current from VIN. Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup mode fault protection for sustained overload, and power good output.

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Technical documentation

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Type Title Date
* Datasheet LM5141-Q1 Wide Input Range Synchronous Buck Controller datasheet (Rev. D) Dec. 18, 2017
Functional safety information LM25141-Q1 Functional Safety FIT Rate and Failure Mode Distribution Dec. 23, 2019
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
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
User guide LM5141-Q1 EVM User’s Guide (Rev. A) Jan. 10, 2018
Application note Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout Nov. 13, 2017
User guide PMP15019 Test Results Feb. 28, 2017
Application note Designing the front-end DC/DC conversion stage to withstand automotive transient Jan. 18, 2017
Application note Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
Technical article Exploiting current-mode control for wide Vin DC/DC conversion Aug. 15, 2014

Design & development

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

Hardware development

document-generic User guide
The LM5141QRGEVM evaluation board provides a fully functional buck power supply, employing peak current mode control. The evaluation board provides a 5.0V @ 5A. The nonomal input voltage range is 8V-18V.
  • VIN 5.5V to 42V
  • 5.0V @5A
  • 2.2MHz operation to avoid the Aumotive AM Band
  • Low Shutdown IQ 10µA
  • Low Standby Current 35µA the output inregualtion, no-load

Design tools & simulation

SNVMAU4A.ZIP (123 KB) - PSpice Model
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 (...)
  • 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
  • (...)
LM5141-Q1 controller quickstart design tool
LM5141DESIGN-CALC — Welcome to the LM5141-Q1 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with design of a DC/DC buck regulator based on the LM5141-Q1 65-V synchronous buck DC/DC controller with low IQ. As such, the user can expeditiously arrive at an optimized design (...)
document-generic User guide
  • Determine buck inductance and input and output capacitances
  • Select components for soft-start, hiccup-mode restart, OCP, switching frequency and output voltage setpoint(s)
  • Optimize compensation values and pole/zero placement in terms of control loop stability using crossover frequency as a performance (...)
SNVC198B.ZIP (1690 KB)

Reference designs

ADAS 8-Channel Sensor Fusion Hub Reference Design with Two 4-Gbps Quad Deserializers
TIDA-01413 — This sensor fusion hub reference design allows the connection of up to four 2-megapixel cameras and up to four radar modules over coaxial cable. This design utilizes these coaxial cables to provide power, backchannel communication, and clock synchronization to the sensors. The two 4 Gbps FPD-Link (...)
document-generic Schematic document-generic User guide
Automotive High Current, Wide VIN Synchronous Buck Controller Reference Design Featuring LM5141-Q1
PMP15019 — PMP15019 uses the LM5141-Q1 low Iq synchronous buck controller as the centerpiece of a high current automotive DC/DC power supply. The PMP15019 operates over the input voltage range of VOUT + 0.5V to 42V. The EVM provides a 5.0V output (default) with a maximum load current of 15A, 20A (...)
document-generic Schematic document-generic User guide
Automotive EMI and thermally optimized synchronous buck converter reference design
PMP21795 — This reference design is an EMI and thermally optimized synchronous buck converter for automotive applications. The circuit is powered from the nominal 12-V battery to provide an output voltage of 3.3 V at 8 A. The design uses a synchronous buck controller operating at a switching frequency of 440 (...)
document-generic Schematic document-generic User guide
25W Automotive Start-Stop Reference Design Operating at 2.2 MHz
PMP15041 — Automotive 12V batteries typically operate in the range of 9V-16V. However this voltage can vary widely due to transient conditions such as cold crank and load dump. This reference design creates a well-regulated 25W (5V,5A) output, regardless of large input voltage transients, utilizing the (...)
document-generic Schematic document-generic User guide
Synchronous Buck Converter for Automotive Cluster Reference Design
PMP20682 — PMP20682 is a synchronous buck converter reference design utilizing the LM5141-Q1 synchronous buck controller I.C. The design accepts an input voltage of 5V to 40V and provides a 3.3V output capable of supplying 10A of current to the load. An EMI filter is incorporated on the input. Optional (...)
document-generic Schematic document-generic User guide
137W Holdup Converter for Storage Server Reference Design
PMP20818 — PMP20818 is a holdup reference design that uses the LM3481 non-synchronous boost and LM5141-Q1 synchronous buck controllers. When the 12V input supply is available, the buck converter is disabled, and the boost converter charges a capacitive holdup bank. In the event of a power outage, the boost (...)
document-generic Schematic document-generic User guide
Automotive Synchronous Buck With 3.3V @ 12.0A Reference Design
PMP30339 This automotive single-phase synchronous buck converter provides 3.3 V at 12 A from an input voltage range of 9 V to 18 V. The extended input voltage range for short-time operation is 4.5 V to 32 V.
document-generic Schematic document-generic User guide

CAD/CAE symbols

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