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LM5166

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3V-65V Input, 500mA Synchronous Buck Converter With Ultra-Low Iq

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3V-65V Input, 500mA Synchronous Buck Converter With Ultra-Low Iq

LM5166

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Product details

Parameters

Vin (Min) (V) 3 Vin (Max) (V) 65 Vout (Min) (V) 1.23 Vout (Max) (V) 65 Iout (Max) (A) 0.5 Iq (Typ) (mA) 0.01 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 600 Features Adjustable Current Limit, Enable, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)

Features

  • Wide Input Voltage Range of 3 V to 65 V
  • 9.7-µA No-Load Quiescent Current
  • –40°C to 150°C Junction Temperature Range
  • Fixed (3.3-V, 5-V) or Adjustable VOUT Options
  • Meets EN55022 / CISPR 22 EMI Standards
  • Integrated 1-Ω PFET Buck Switch
    • Supports 100% Duty Cycle for Low Dropout
  • Integrated 0.5-Ω NFET Synchronous Rectifier
    • Eliminates External Schottky Diode
  • Programmable Peak Current Limit Supports:
    • 500-mA, 300-mA, or 200-mA Loads
  • Selectable PFM or COT Mode Operation
  • 1.223-V ±1.2% Internal Voltage Reference
  • Switching Frequency up to 600 kHz
  • 900-µs Internal or Externally-Adjustable Soft Start
  • Diode Emulation and Pulse Skipping for Ultra-High Light-Load Efficiency
  • No Loop Compensation or Bootstrap Components
  • Precision Enable and Input UVLO With Hysteresis
  • Open-Drain Power Good Indicator
  • Thermal Shutdown Protection With Hysteresis
  • Pin-to-Pin Compatible With the LM5165
  • 10-Pin, 3-mm × 3-mm VSON Package
  • Create a Custom Regulator Design Using WEBENCH® Power Designer

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Description

The LM5166 is a compact, easy-to-use, 3-V to 65-V, ultra-low IQ synchronous buck converter with high efficiency over wide input voltage and load current ranges. With integrated high-side and low-side power MOSFETs, up to 500 mA of output current can be delivered at fixed output voltages of 3.3 V or 5 V, or an adjustable output. The converter is designed to simplify implementation while providing options to optimize the performance for the target application. Pulse frequency modulation (PFM) mode is selected for optimal light-load efficiency or constant on-time (COT) control for nearly constant operating frequency. Both control schemes do not require loop compensation while providing excellent line and load transient response and short PWM on-time for large step-down conversion ratios.

The high-side P-channel MOSFET can operate at 100% duty cycle for lowest dropout voltage and does not require a bootstrap capacitor for gate drive. Also, the current limit setpoint is adjustable to optimize inductor selection for a particular load current requirement. Selectable and adjustable start-up timing options include minimum delay (no soft start), internally fixed (900 µs), and externally programmable soft start using a capacitor. An open-drain PGOOD indicator can be used for sequencing, fault reporting, and output voltage monitoring. The LM5166 is available in a 10-pin VSON package with 0.5-mm pin pitch.

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Technical documentation

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Type Title Date
* Datasheet LM5166 3-V to 65-V Input, 500-mA Synchronous Buck Converter With Ultra-Low IQ datasheet (Rev. B) Jun. 01, 2017
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
White papers Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application notes Powering Drones With a Wide VIN DC-DC Converter (Rev. A) Feb. 05, 2019
Application notes Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems Sep. 10, 2018
Application notes Selecting an Ideal Ripple Generation Network for Your COT Buck Converter (Rev. A) Jun. 15, 2017
Technical articles The power to innovate industrial design Mar. 27, 2017
User guides LM5166EVM-C50A Evaluation Module Dec. 08, 2016
User guides LM5166EVM-C33A Evaluation Module Dec. 07, 2016
Technical articles Trends in building automation: predictive maintenance Nov. 01, 2016
Application notes Low-EMI buck powers a multivariable sensor transmitter with BLE connectivity Oct. 24, 2016
Technical articles Powering smart sensor transmitters in industrial applications May 02, 2016
Application notes Accurately measuring efficiency of ultralow-IQ devices Jan. 22, 2014

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
49
Description
The LM5166EVM-C33A evaluation module (EVM) is designed to showcase the performance and all features of the LM5166, wide-VIN, synchronous buck DC/DC buck converter with ultra-low no-load supply current. The design is packaged in a miniature footprint with low component count. It operates over a wide (...)
Features
  • 4.5V to 65V input voltage range
  • 3.3V target output voltage
  • Ultra-high power conversion efficiency: >85% at an output of 3.3 V and above 10 mA load (input voltage 12 V)
  • COT or PFM control architecture
  • No-load supply current as low as 12µA
View details
EVALUATION BOARDS Download
document-generic User guide
49
Description
The LM5166EVM evaluation module (EVM) is designed to showcase the performance and all features of the LM5166, wide-VIN, synchronous buck DC/DC buck converter with ultra-low no-load supply current. The design is packaged in a miniature footprint with low component count. It operates over a wide input (...)
Features
  • 6V to 65V input voltage range
  • 5V target output voltage
  • Ultra-high power conversion efficiency: >90% at an output of 5 V and above 1 mA load (input voltage 12 V)
  • COT or PFM control architecture
  • No-load supply current as low as 12µA
View details

Design tools & simulation

SIMULATION MODELS Download
SNVMAV7B.ZIP (5 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAV8B.ZIP (104 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAZ0B.ZIP (5 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAZ1B.ZIP (124 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAZ2B.ZIP (5 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAZ3B.ZIP (130 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
  • (...)
View details
CALCULATION TOOLS Download
LM5166 DC/DC Converter Design Tool
LM5166DESIGN-CALC — Welcome to the LM5166 Quick-Start Design Tool. This standalone tool facilitates and assists the power supply engineer with design of a DC/DC buck converter based on the LM5166 low IQ synchronous buck DC/DC regulator. As such, the user can expeditiously arrive at an optimized design to meet the (...)
Features
  • Determine filter inductance and input and output filter capacitances for a given operating mode (PFM or COT)
  • Optimize the design using efficiency and solution size as key performance metrics
  • Select components for soft-start, input UVLO, output voltage setpoint, current limit and switching frequency
  • (...)
View details
CALCULATION TOOLS Download
SNVC204A.ZIP (2344 KB)

Reference designs

REFERENCE DESIGNS Download
Ultrasonic Distance Sensor with IO-Link Reference Design
TIDA-01386 — This reference design features an ultrasonic distance sensor that fits in a M12 housing due to its high integration and an optimized layout. The design offers an IO-Link interface to communicate with the system control, which makes it industry 4.0 ready.  The purpose of ultrasonic sensors (...)
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REFERENCE DESIGNS Download
Non-isolated power architecture with diagnostics reference design for protection relay modules
TIDA-010055 — This reference design showcases non-isolated power supply architectures for protection relays with analog input/output and communication modules generated from 5-, 12-, or 24-V DC input. To generate the power supplies the design uses DC/DC converters with an integrated FET, a power module with an (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
TUV-assessed digital input reference design for IEC 61508 (SIL-2)
TIDA-010049 — This 8-channel, group-isolated, digital input module reference design, focuses on applications with the need for industrial functional safety. This design has diagnostics implemented to help detect both permanent and transient random hardware faults. The concept of this input module has been (...)
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REFERENCE DESIGNS Download
Isolated CAN Flexible Data (FD) Rate Repeater Reference Design
TIDA-01487 — CAN and CANopen are legacy fieldbus protocols used in many applications in factory automation. Whenever high voltage could damage the end equipment there is need for isolation. This isolated CAN flexible data (FD) rate repeater reference design adds electrical isolation between two CAN bus (...)
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REFERENCE DESIGNS Download
RGB Signal Light With IO-Link Interface Reference Design
TIDA-01437 — This reference design implements a five-segment LED smart stack light with 20 LEDs used in factory floor and industrial process automation of greater complexity. An IO-Link interface is implemented for controlling the stack light and reading back status information. The design features low power (...)
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REFERENCE DESIGNS Download
24-V AC Power Stage With Wide Vin Converter and Battery Gauge Reference Design for Smart Thermostat
TIDA-01395 — The TIDA-01395 TI Design provides a low BOM cost, high-efficiency power stage solution for smart thermostats, and other gateway building automation end quipment. This power stage takes a 24-V AC input and produces a 5-V and 3.3-V output rail, which can power additional point-of-load converters if (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Less Than 1-W, Quad-Channel, Analog Output Module With Adaptive Power Management Reference Design
TIPD215 — This quad-channel, analog output module delivers voltage and current outputs using the highly integrated DAC8775 digital-to-analog converter (DAC). Integrated adaptive power management, along with the LM5166 buck converter, reduces the total power dissipation of the reference design to less than 1 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
24-V AC Power Stage With Wide Vin Converter and Battery Backup Reference Design for Smart Thermostat
TIDA-01358 — The TIDA-01358 reference design provides a low BOM cost, high efficiency power stage solution for smart thermostats and other gateway building automation end equipment. This power stage takes a 24Vac input and produces a 5V and 3.3V output rail which can power additional point-of-load converters if (...)
document-generic Schematic document-generic User guide

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