LM5166

VSON (DRC)

9 mm² 3 x 3

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 V_OUT 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

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 V_OUT 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

The LM5166 is a compact, easy-to-use, 3-V to 65-V, ultra-low I_Q 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
*	Data sheet	LM5166 3-V to 65-V Input, 500-mA Synchronous Buck Converter With Ultra-Low IQ datasheet (Rev. B)	01 Jun 2017
	Application note	Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A)	26 Jul 2021
	Selection guide	Buck Converter Quick Reference Guide (Rev. B)	08 Apr 2021
	White paper	Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A)	10 Apr 2019
	Technical article	Minimize the impact of the MLCC shortage on your power application	29 Mar 2019
	Application note	Powering Drones With a Wide VIN DC-DC Converter (Rev. A)	05 Feb 2019
	Application note	Selecting an Ideal Ripple Generation Network for Your COT Buck Converter (Rev. A)	15 Jun 2017
	Technical article	The power to innovate industrial design	27 Mar 2017
	User guide	LM5166EVM-C50A Evaluation Module	08 Dec 2016
	User guide	LM5166EVM-C33A Evaluation Module	07 Dec 2016
	Technical article	Trends in building automation: predictive maintenance	01 Nov 2016
	Analog design journal	Low-EMI buck powers a multivariable sensor transmitter with BLE connectivity	24 Oct 2016
	Technical article	Powering smart sensor transmitters in industrial applications	02 May 2016
	Analog design journal	Accurately measuring efficiency of ultralow-IQ devices	22 Jan 2014

Design & development

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

Evaluation board

LM5166EVM-C33A — LM5166 Wide VIN, Low IQ, COT 3.3V 500mA Evaluation Module

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 (...)

User guide

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Evaluation board

LM5166EVM-C50A — LM5166 Wide VIN, Low IQ, COT 5V 500mA Evaluation Module

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 (...)

User guide

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Limit: 5

Simulation model

LM5166 Unencrypted PSpice Transient Model (Rev. B)

SNVMAV7B.ZIP (5 KB) - PSpice Model

Simulation model

LM5166 PSpice Transient Model (Rev. B)

SNVMAV8B.ZIP (104 KB) - PSpice Model

Simulation model

LM5166Y Unencrypted PSpice Transient Model (Rev. B)

SNVMAZ0B.ZIP (5 KB) - PSpice Model

Simulation model

LM5166Y PSpice Transient Model (Rev. B)

SNVMAZ1B.ZIP (124 KB) - PSpice Model

Simulation model

LM5166X Unencrypted PSpice Transient Model (Rev. B)

SNVMAZ2B.ZIP (5 KB) - PSpice Model

Simulation model

LM5166X PSpice Transient Model (Rev. B)

SNVMAZ3B.ZIP (130 KB) - PSpice Model

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)

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Calculation tool

LM5166DESIGN-CALC — LM5166 DC/DC converter design tool

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 (...)

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Calculation tool

LM5166 Quick-Start Calculator (Rev. A)

SNVC204A.ZIP (2344 KB)

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