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LM5165

ACTIVE

3V-65V, 150mA Synchronous Buck Converter With Ultra-Low IQ

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Data sheet

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LMR36502 ACTIVE 3-V to 65-V, 150-mA ultra-small synchronous buck converter with 6 μA IQ Newer device with smaller footprint, lower IQ and improved EMI mitigation features.

LM5165

ACTIVE
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Product details

Rating Automotive Operating temperature range (°C) -40 to 150 Topology Buck Type Converter Iout (max) (A) 0.15 Vin (min) (V) 3 Vin (max) (V) 65 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 Control mode Constant on-time (COT) Vout (min) (V) 1.23 Vout (max) (V) 65 Iq (typ) (µA) 10 Duty cycle (max) (%) 100
Rating Automotive Operating temperature range (°C) -40 to 150 Topology Buck Type Converter Iout (max) (A) 0.15 Vin (min) (V) 3 Vin (max) (V) 65 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 Control mode Constant on-time (COT) Vout (min) (V) 1.23 Vout (max) (V) 65 Iq (typ) (µA) 10 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 and LM5165X is also available in the VSSOP-10 package.

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 and LM5165X is also available in the VSSOP-10 package.
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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. D) PDF | HTML 16 Dec 2022
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
Application brief 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 PDF | HTML 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 PDF | HTML 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 PDF | HTML 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
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Simulation model

LM5165 Unencrypted PSpice Transient Model (Rev. B)

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

LM5165X PSpice Transient Model (Rev. A)

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

LM5165X Unencrypted PSpice Transient Model (Rev. A)

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

LM5165Y PSpice Transient Model (Rev. A)

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

LM5165Y Unencrypted PSpice Transient Model (Rev. A)

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