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LM5140-Q1

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Wide Vin Dual 2.2MHz low Iq Synchronous Buck Controller

Data sheet
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Wide Vin Dual 2.2MHz low Iq Synchronous Buck Controller

LM5140-Q1

ACTIVE
Data sheet Order now

Product details

Parameters

Vin (Min) (V) 3.8 Vin (Max) (V) 65 Vout (Min) (V) 1.5 Vout (Max) (V) 15 Iout (Max) (A) 40 Iq (Typ) (uA) 35 Switching frequency (Min) (kHz) 350 Switching frequency (Max) (kHz) 2600 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Multiple Outputs, Phase Interleaving, Power Good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, Tracking, UVLO Fixed Operating temperature range (C) -40 to 150 Regulated outputs (#) 2 Number of Phases 2 Rating Automotive open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VQFNP (RWG) 40 36 mm² 6 x 6 open-in-new Find other Buck controllers (external switch)

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Test Guidance With the Following
    • Device Temperature Grade 1: –40°;C to +125°;C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • Input Operating Range from 3.8 V to 65 V (70 V Absolute Maximum)
  • Two Interleaved Buck Controllers With:
    • VOUT1 Fixed 3.3 V, 5 V, or Adjustable from 1.5 V – 15 V, Accuracy ±1%
    • VOUT2 Fixed 5 V, 8 V, or Adjustable from 1.5 V – 15 V, Accuracy ±1%
  • Fixed 2.2-MHz or 440-kHz Switching Frequency, Accuracy ±7%
  • Optional Synchronization to an External Clock
  • SYNC Output Clock for Additional Converters
  • Shutdown Mode Current: 9 µA Typical
  • No Load Standby Current: 35 µA Typical (One Channel Operating)
  • Current Limit Threshold Programmable to 50 mV or 75 mV, Accuracy ±10%
  • Independent Enable Inputs for VOUT1 and VOUT2
  • Hiccup Mode Protection for Sustained Overload
  • Independent Power Good Outputs
  • High-Side and Low-Side Gate Drivers With Adjustable Slew Rate Control
  • Selectable Diode Emulation or Continuous Conduction at Light Load
  • 40-Pin VQFN Package With Wettable Flanks
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Description

The LM5140-Q1 is a dual synchronous buck controller intended for high voltage wide VIN step-down converter applications. The control method is based on current mode control. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting, and easier loop compensation.

The LM5140-Q1 features adjustable slew rate control to simplify compliance with the CISPR and automotive EMI requirements. The LM5140-Q1 operates at selectable switching frequencies of 2.2 MHz or 440 kHz with the two controller channels switching 180°; out of phase. In light or no-load conditions, the LM5140-Q1 operates in skip cycle mode for improved low power efficiency. The LM5140-Q1 includes a high voltage bias regulator with automatic switchover to an external bias supply to improve efficiency and reduce input current. Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup mode fault protection for sustained overloads, independent power good outputs, and independent enable inputs.

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Technical documentation

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Type Title Date
* Data sheet LM5140-Q1 Wide Input Range Dual Synchronous Buck Controller datasheet (Rev. A) Dec. 20, 2016
Selection guide Automotive Infotainment EE Buck Converter/Controller Selection Guide (Rev. B) Apr. 15, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 2021
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Application note Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout Nov. 13, 2017
Technical article How to use dual buck controllers to power PMICs in automotive applications Nov. 08, 2017
Selection guide Control-Mode Quick Reference Guide (Rev. A) Sep. 14, 2017
Technical article Create a power supply for an MRI application Aug. 14, 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 How to use slew rate for EMI control Mar. 21, 2016
Technical article How to extend a controller’s output-voltage range Mar. 20, 2016
User guide LM5140-Q1 High Density EVM User’s Guide Feb. 17, 2016
Application note Maintaining Output Voltage Regulation During Automotive Cold-Crank with LM5140 Jan. 13, 2016
User guide LM5140 EVM User's Guide Jan. 12, 2016
Application note Benefits of a multiphase buck converter Jan. 31, 2012

Design & development

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

Hardware development

EVALUATION BOARD Download
1146.54
Description
J6Entry, RSP and TDA2E-17 CPU Board EVM is an evaluation platform designed to speed up development efforts and reduce time to market for Infotainment  reconfigurable Digital Cluster or Integrated Digital Cockpit and ADAS applications. The CPU board integrates key peripherals such as parallel (...)
Features
  • 2GB DDR3L
  • LP8733/LP8732 Power Solution
  • On-board eMMC, NAND, NOR
  • USB3, USB2, PCIe, Ethernet, COM8Q, CAN, MLB, MicroSD and HDMI connectors
View details
EVALUATION BOARD Download
2324.44
Description

The J6Entry/RSP EVM is an evaluation platform designed to speed up development efforts and reduce time to market for applications such as Infotainment, reconfigurable Digital Cluster or Integrated Digital Cockpit.

The main CPU board integrates these key peripherals such as Ethernet or HDMI, while the (...)

Features
  • 10.1" Display with capacitive Touch
  • JAMR3 Radio Tuner Application Board
  • 2GB DDR3L
  • LP8733/LP8732 Power Solution
  • On-board eMMC, NAND, NOR
  • USB3, USB2, PCIe, Ethernet, COM8Q, CAN, MLB, MicroSD and HDMI connectors
View details
EVALUATION BOARD Download
document-generic User guide
99
Description

The LM5140RWGEVM evaluation board provides a fully functional buck power supply, employing peak current mode control. The evaluation board provides two independent outputs, a 3.3V @ 6A and a 5.0V @ 5A. The nonomal input voltage range is 8V-18V, with an extended operating range of 3.8V to 42V.  (...)

Features
  • VIN 3.8V to 42V
  • Dual outputs 3.3V @6A and 5.0V @5A
  • 2.2MHz operation to avoid the Aumotive AM Band
  • Low Shutdown IQ 10µA
  • Low Standby Current 35µA one channel enabled, no-load
View details
EVALUATION BOARD Download
document-generic User guide
99
Description
The LM5140RWGEVMHD evaluation board provides a fully functional buck power supply, employing peak current mode control. The evaluation board provides two independent outputs, a 3.3V @ 5.0A and a 5.0V @ 5A.
Features
  • VIN 3.8V to 42V
  • Dual outputs 3.3V @5A and 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
View details

Design tools & simulation

SIMULATION MODEL Download
SNVMAJ7B.ZIP (91 KB) - PSpice Model
SIMULATION TOOL 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
  • (...)
View details
CALCULATION TOOL Download
Quick Start Calculator for the LM5140-Q1
LM5140ADESIGN-CALC — Welcome to the LM5140-1 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC synchronous buck converter based on the LM5140-Q1 current-mode controller. As such, the user can expeditiously arrive at an optimized design to meet (...)
Features
  • Determine filter inductance and input and output filter capacitances
  • Optimize the design using efficiency and solution size as key performance metrics
  • Select components for soft-start, output voltage  and compensation
  • Inspect converter efficiency and component power dissipation
  • Analyze efficiency based (...)
View details
CALCULATION TOOL Download
SNVC191D.ZIP (2118 KB)

Reference designs

REFERENCE DESIGNS Download
Automotive Power Reference Design for Infotainment Systems
PMP30267 — This reference design shows a complete power tree for automotive infotainment systems. The LM74700-Q1 provides reverse battery protection to the system and provides immunity to automotive transients specified in ISO 7637-2 and ISO 16750-2. The pre-booster with LM5150-Q1 provides a stable supply (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive Off-battery Dual-phase Boost Converter Reference Design
TIDA-01534 — This reference design is a high power, wide input voltage range circuit that uses synchronous boost controllers in a dual-phase configuration outputting four (4) switchable 12-V rails that each can supply up to 2.5 A with diagnostic features; plus a dual synchronous buck that generates two high (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive Off-battery VCM Supporting 2.5-V Cold Crank Profile Reference Design
TIDA-01553 — This reference design is a high-current, wide input voltage range circuit that can handle engine cold crank profile down to 2.5V. The dual-output voltages are 5V and 3.3V that support up to 10A for each output. The design is suitable for an automotive off-battery infotainment application that needs (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Dual-Phase Synchronous Buck Converter for Automotive Audio Reference Design
PMP20440 — PMP20440 is a dual phase synchronous buck converter reference design for 12V output at 11A from an input voltage of 6V to 17V. At an input voltage of 12V or less the output will follow with a small voltage drop. This design uses the LM5140-Q1 dual phase synchronous buck controller at a free-running (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
61W Automotive Dual Output Synchronous Buck Converter Reference Design
PMP10655 — PMP10655 is a dual-output synchronous buck converter reference design using the LM5140 controller IC. The reference design accepts an input voltage between 6Vin and 18Vin and is capable of supplying a maximum of 8A of continuous current (14A Peak) to the load, per output. Vout1 and Vout2 maintain (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive High Current, Wide VIN Synchronous Buck Controller Reference Design Featuring LM5140-Q1
PMP15032 — PMP15032 demonstrates the operation and performance of the LM5140-Q1 synchronous buck controller in a high current dual-phase application. The PMP15032 operates over the input voltage range of 5.5 to 42V. The EVM provides a 5.0V output with a maximum load current of 45A (22.5A per phase).  The (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive Interleaved Synchronous Buck Reference Design
PMP30059 — This interleaved synchronous buck converter provides 3.3V @ 16.0A from an input voltage of 6 .. 18V (40V peak).
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
50W System-Level Power Reference Design for Automotive Infotainment Systems
TIDA-00744 — TIDA-00744 is a 50-W system-level SMPS design for mid-power automotive infotainment systems.
The design has protections, such as load dump through TVS (ISO pulse testing), as well as reverse voltage (innovative smart diode with very low Iq) protection. Furthermore, all the controllers (boost and (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
100W System-Level Power Reference Design for Automotive Infotainment System
PMP10749 — PMP10749 is a 100-W system-level SMPS design for a higher-power automotive infotainment system. The design has protections, such as load dump through TVS (ISO pulse testing), as well as reverse voltage (innovative smart diode with very low Iq) protection. Furthermore, all the controllers (boost and (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFNP (RWG) 40 View options

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