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LMR36503 ACTIVE 3-V to 65-V, 0.3-A ultra-small synchronous buck converter with 6 μA IQ Available as wettable flanks, better current ratings and smaller size

Product details

Vin (Min) (V) 3 Vin (Max) (V) 65 Vout (Min) (V) 1.23 Vout (Max) (V) 65 Iout (Max) (A) 0.15 Iq (Typ) (uA) 10 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 Rating Automotive Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (Max) (%) 100
Vin (Min) (V) 3 Vin (Max) (V) 65 Vout (Min) (V) 1.23 Vout (Max) (V) 65 Iout (Max) (A) 0.15 Iq (Typ) (uA) 10 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 Rating Automotive Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (Max) (%) 100
VSON (DRC) 10 9 mm² 3 x 3
  • Wide input voltage range of 3 V to 65 V
  • 10.5-µA no-load quiescent current
  • –40°C to 150°C junction temperature range
  • Fixed (3.3 V and 5 V) or adjustable output voltages
  • Meets EN55022 / CISPR 22 EMI standards
  • Integrated 2-Ω PMOS buck switch
    • Supports 100% duty cycle for low dropout
  • Integrated 1-Ω NMOS synchronous rectifier
    • Eliminates external rectifier diode
  • Programmable current limit setpoint (four levels)
  • Selectable PFM or COT mode operation
  • 1.223-V ±1% internal voltage reference
  • 900-µs internal or programmable soft start
  • Active slew rate control for low EMI
  • Diode emulation mode and pulse skipping for ultra-high light-load efficiency performance
  • Monotonic start-up into prebiased output
  • No loop compensation or bootstrap components
  • Precision enable and input UVLO with hysteresis
  • Pin-to-pin compatible with the LM5166
  • Thermal shutdown protection with hysteresis
  • 10-pin, 3-mm × 3-mm VSON package
  • Use TPSM265R1 module for faster time to market
  • Create a custom regulator design using WEBENCH Power Designer
  • Wide input voltage range of 3 V to 65 V
  • 10.5-µA no-load quiescent current
  • –40°C to 150°C junction temperature range
  • Fixed (3.3 V and 5 V) or adjustable output voltages
  • Meets EN55022 / CISPR 22 EMI standards
  • Integrated 2-Ω PMOS buck switch
    • Supports 100% duty cycle for low dropout
  • Integrated 1-Ω NMOS synchronous rectifier
    • Eliminates external rectifier diode
  • Programmable current limit setpoint (four levels)
  • Selectable PFM or COT mode operation
  • 1.223-V ±1% internal voltage reference
  • 900-µs internal or programmable soft start
  • Active slew rate control for low EMI
  • Diode emulation mode and pulse skipping for ultra-high light-load efficiency performance
  • Monotonic start-up into prebiased output
  • No loop compensation or bootstrap components
  • Precision enable and input UVLO with hysteresis
  • Pin-to-pin compatible with the LM5166
  • Thermal shutdown protection with hysteresis
  • 10-pin, 3-mm × 3-mm VSON package
  • Use TPSM265R1 module for faster time to market
  • Create a custom regulator design using WEBENCH Power Designer

The LM5165 device 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 150-mA of output current can be delivered at fixed output voltages of 3.3 V or 5 V or at 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 output 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 LM5165 buck converter is available in a 10-pin, 3-mm × 3-mm, thermally-enhanced VSON-10 package with 0.5-mm pin pitch.

The LM5165 device 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 150-mA of output current can be delivered at fixed output voltages of 3.3 V or 5 V or at 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 output 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 LM5165 buck converter is available in a 10-pin, 3-mm × 3-mm, thermally-enhanced VSON-10 package with 0.5-mm pin pitch.

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Technical documentation

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Type Title Date
* Data sheet LM5165 3-V to 65-V Input, 150-mA Synchronous Buck Converter With Ultra-Low IQ datasheet (Rev. C) PDF | HTML 09 Dec 2020
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) PDF | HTML 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
Technical article Use a low-quiescent-current switcher for high-voltage conversion 28 Aug 2018
Application note Selecting an Ideal Ripple Generation Network for Your COT Buck Converter (Rev. A) 15 Jun 2017
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 Low-IQ synchronous buck converter enables intelligent field-sensor applications 26 Apr 2016
Technical article DC/DC converter datasheets - Quiescent current demystified: Part two 11 Apr 2016
EVM User's guide LM5165EVM-HD-C50X EVM User's Guide 27 Jan 2016
EVM User's guide LM5165EVM-HD-P50A EVM User's Guide 21 Apr 2015
Analog Design Journal Accurately measuring efficiency of ultralow-IQ devices 22 Jan 2014
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013

Design & development

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

Evaluation board

LM5165EVM-HD-C50X — LM5165 Low Iq Synchronous Buck Converter High Density COT Evaluation Module

The LM5165EVM-HD-C50X high density evaluation module (EVM) is designed to showcase the performance of the LM5165 high performance, exceptionally small, synchronous buck DC/DC buck converter with ultralow IQ. The module-style design is packaged in a miniature footprint with low component count. It (...)
User guide: PDF
Not available on TI.com
Evaluation board

LM5165EVM-HD-P50A — LM5165 Low Iq Synchronous Buck Converter High Density PFM Evaluation Module

The LM5165EVM-HD-P50A high density evaluation module (EVM) is designed to showcase the performance of the LM5165 high performance, exceptionally small, synchronous buck DC/DC buck converter with ultralow IQ. The module-style design is packaged in a miniature footprint with low component count. It (...)

User guide: PDF
Not available on TI.com
Simulation model

LM5165 PSpice Transient Model (Rev. B)

SNVMAH3B.ZIP (133 KB) - PSpice Model
Simulation model

LM5165 Unencrypted PSpice Transient Model (Rev. B)

SNVMAK5B.ZIP (4 KB) - PSpice Model
Simulation model

LM5165X PSpice Transient Model (Rev. A)

SNVMAJ5A.ZIP (95 KB) - PSpice Model
Simulation model

LM5165X Unencrypted PSpice Transient Model (Rev. A)

SNVMAK3A.ZIP (4 KB) - PSpice Model
Simulation model

LM5165Y PSpice Transient Model (Rev. A)

SNVMAJ6A.ZIP (90 KB) - PSpice Model
Simulation model

LM5165Y Unencrypted PSpice Transient Model (Rev. A)

SNVMAK4A.ZIP (4 KB) - PSpice Model
Calculation tool

LM5165DESIGN-CALC — LM5165 DC/DC converter design tool

Welcome to the LM5165 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with design of a DC/DC buck converter based on the LM5165 low IQ synchronous buck DC/DC regulator. As such, the user can expeditiously arrive at an optimized design to meet the (...)
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 (...)
Reference designs

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PLC applications requiring fast timing and fast cycle time can now be realized using this reference design which implements, an eight-port IO-Link master. It can be used to build a remote IO gateway to connect to OPC UA, Profinet, EtherCAT or Ethernet IP. A PRU-based frame handler enables a very (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-010055 — Non-isolated power architecture with diagnostics reference design for protection relay modules

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01081 — LED-Lighting Control Reference Design for Machine Vision

This LED lighting control reference design demonstrates a unique approach to drive and control a string of multiple high-power light-emitting diodes (LEDs). This reference design is targeted for industrial machine vision systems and is also suitable for other industrial or automotive lighting (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01463 — Connected LED Lighting With IEEE802.3bt Power Over Ethernet (PoE) Reference Design

This Power over Ethernet (PoE) reference design supplies power and data over a single Ethernet cable to a connected LED lighting ballast. This reference design uses TI's TPS2372-4 PoE powered device (PD) interface, LM3409 buck controller, LM5165 buck converter, TPS62740 buck converter, (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01415 — 100-W, High-Resolution, 16-bit Color-Tunable, 0.15% Dimmable RGBW LED Luminaire Reference Design

This reference design demonstrates the finest range of color control of individual RGBW LED strings with > 16 bits of PWM resolution while supporting the PWM modulation frequencies as high as 30 and 50 kHz. This reference design demonstrates the finest range of individual RGBW LED strings color (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01478 — IO-Link With Digital Output and DC/DC Reference Design

This reference design demonstrates the ability to have a high-density, IO-Link transceiver module, digital output (DO) (1) channel, and a DC-DC buck converter. With the DC-DC this module can power a wide array of external devices, such as microcontrollers (MCUs), sensors, displays, and more. (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00666 — Field Transmitter with BLE Connectivity Powered from 4 to 20-mA Current Loop Reference Design

TIDA-00666 enables Bluetooth Low Energy communication powered from a 2-wire 4- to 20-mA loop. For industrial process control instruments, analog 4- to 20-mA current loops are commonly used for analog signaling, with 4 mA representing the lowest end of the range and 20 mA the highest. This (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
VSON (DRC) 10 View options

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