LM5180

WSON (NGU)

8

16 mm² 4 x 4

Designed for reliable and rugged applications
- Wide input voltage range of 4.5 V to 65 V with operation down to 3.5 V after start-up
- Robust solution with only one component crossing the isolation barrier
- ±1.5% total output regulation accuracy
- Optional V_OUT temperature compensation
- 6-ms internal or programmable soft start
- Input UVLO and thermal shutdown protection
- Hiccup-mode overcurrent fault protection
- –40°C to +150°C junction temperature range
Integration reduces solution size and cost
- Integrated 100-V, 0.4-Ω power MOSFET
- No opto-coupler or transformer auxiliary winding required for V_OUT regulation
- Internal loop compensation
High-efficiency PSR flyback operation
- Quasi-resonant MOSFET turn-off in BCM
- Low input quiescent current
- External bias option for improved efficiency
- Single- and multi-output implementations
Ultra-low conducted and radiated EMI signatures
- Soft switching avoids diode reverse recovery
- Optimized for CISPR 32 EMI requirements
Create a custom regulator design using WEBENCH^® Power Designer

Designed for reliable and rugged applications
- Wide input voltage range of 4.5 V to 65 V with operation down to 3.5 V after start-up
- Robust solution with only one component crossing the isolation barrier
- ±1.5% total output regulation accuracy
- Optional V_OUT temperature compensation
- 6-ms internal or programmable soft start
- Input UVLO and thermal shutdown protection
- Hiccup-mode overcurrent fault protection
- –40°C to +150°C junction temperature range
Integration reduces solution size and cost
- Integrated 100-V, 0.4-Ω power MOSFET
- No opto-coupler or transformer auxiliary winding required for V_OUT regulation
- Internal loop compensation
High-efficiency PSR flyback operation
- Quasi-resonant MOSFET turn-off in BCM
- Low input quiescent current
- External bias option for improved efficiency
- Single- and multi-output implementations
Ultra-low conducted and radiated EMI signatures
- Soft switching avoids diode reverse recovery
- Optimized for CISPR 32 EMI requirements
Create a custom regulator design using WEBENCH^® Power Designer

The LM5180 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to 65 V. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation.

The high level of integration results in a simple, reliable and high-density design with only one component crossing the isolation barrier. Boundary conduction mode (BCM) switching enables a compact magnetic solution and better than ±1.5% load and line regulation performance. An integrated 100-V power MOSFET provides output power up to 7 W with enhanced headroom for line transients.

The LM5180 flyback converter is available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin pitch.

The LM5180 flyback converter simplifies implementation of isolated DC/DC supplies with optional features to optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop. Additional features include an internally-fixed or externally-programmable soft start, optional bias supply connection for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM5180 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to 65 V. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation.

The high level of integration results in a simple, reliable and high-density design with only one component crossing the isolation barrier. Boundary conduction mode (BCM) switching enables a compact magnetic solution and better than ±1.5% load and line regulation performance. An integrated 100-V power MOSFET provides output power up to 7 W with enhanced headroom for line transients.

The LM5180 flyback converter is available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin pitch.

The LM5180 flyback converter simplifies implementation of isolated DC/DC supplies with optional features to optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop. Additional features include an internally-fixed or externally-programmable soft start, optional bias supply connection for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

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Technical documentation

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	Type	Title	Date
*	Data sheet	LM5180 65-VIN PSR Flyback DC/DC Converter with 100-V, 1.5-A Integrated Power MOSFET datasheet (Rev. D)	18 Sep 2019
	Application note	LM5181 Bipolar + and - 18 V Output Design for Signal Chains in PLC Applications	29 Oct 2021
	Application note	LM5180 EMI Performance	04 Apr 2021
	Analog design journal	Selecting output caps to optimize ripple and stability in PSR flyback converters (Rev. A)	21 Dec 2020
	Application note	Topology Selection for Isolated Power Supplies in Patient Monitor (Rev. A)	02 Sep 2020
	Functional safety information	LMx518x-Q1 Functional Safety FIT Rate and Failure Mode Distribution (Rev. A)	26 Jun 2020
	Technical article	How to raise regulation performance with a stacked-output PSR flyback DC/DC converter	02 Jun 2020
	Analog design journal	Why use PSR‐flyback isolated converters in dual‐battery mHEV systems	19 Mar 2020
	Application note	Designing High Voltage Power Supply for Ultrasound Smart Probes	22 Oct 2019
	Analog design journal	How an auxless PSR-flyback converter can increase PLC reliability and density	30 Sep 2019
	User guide	LM5180-Q1 Dual-Output EVM User's Guide (Rev. B)	18 Jul 2019
	User guide	LM5180-Q1 Single-Output EVM User's Guide (Rev. D)	18 Jul 2019
	Application note	Powering Drones With a Wide VIN DC-DC Converter (Rev. A)	05 Feb 2019
	White paper	An overview of radiated EMI specifications for power supplies	05 Jun 2018
	White paper	An overview of conducted EMI specifications for power supplies	01 Feb 2018
	Application note	PSR Flyback DC/DC Converter Transformer Design for mHEV Applications	13 Nov 2017
	Application note	Seminar 900 Topic 2 - Snubber Circuits: Theory, Design and Application	15 Feb 2001

Design & development

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

Evaluation board

LM5180EVM-DUAL — Wide VIN PSR flyback converter dual-output evaluation module

The LM5180EVM-DUAL evaluation module (EVM) is designed to showcase the performance of the LM5180 PSR flyback converter with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a wide input voltage range of 10 V to 65 V to deliver a (...)

User guide

In stock

Limit: 5

Evaluation board

LM5180EVM-S05 — Wide VIN PSR flyback converter single-output evaluation module

The LM5180EVM-S05 evaluation module (EVM) is designed to showcase the performance of the LM5180 PSR flyback converter with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a wide input voltage range of 10 V to 65 V to deliver a (...)

User guide

In stock

Limit: 2

Simulation model

LM5180-Q1 PSpice Transient Model

SNVMBL6.ZIP (183 KB) - PSpice Model

Simulation model

LM5180-Q1 TINA-TI Startup Transient Model

SNVMBW8.TSC (1102 KB) - TINA-TI Reference Design

Simulation model

LM5180-Q1 TINA-TI Steady State Transient Model

SNVMBW9.TSC (1100 KB) - TINA-TI Reference Design

Simulation model

LM5180-Q1 TINA-TI Dual Startup 15Vout1 and -8Vout2 Transient Model

SNVMBX0.TSC (1352 KB) - TINA-TI Reference Design

Simulation model

LM5180-Q1 TINA-TI Dual Startup 24Vout1 and 5Vout2 Transient Model

SNVMBX1.TSC (1345 KB) - TINA-TI Reference Design

Calculation tool

LM5180DESIGN-CALC — LM5180 PSR flyback converter design tool

Welcome to the LM5180 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC flyback regulator based on the LM5180 PSR flyback converter. As such, the user can expeditiously arrive at an optimized design to meet the application (...)

User guide

Gerber file

LM5180 Quickstart Design Tool (Rev. B)

SNVC218B.ZIP (3098 KB)

PCB layout

LM5180EVM-S05 PCB Layout Files

SNVC233.ZIP (1903 KB)

PCB layout

LM5180EVM-DUAL PCB Layout Files

SNVR472.ZIP (3416 KB)

Reference designs

PMP30817 — 10-VDC to 30-VDC input PSR flyback converter with dual-output reference design

This reference design provides two isolated voltages (6 V at 200 mA, 12 V at 200 mA) from a DC-input supply (10 V - 30 V). By means of zero ohm resistors, a flexible transformer can be configured to change the turns ratio and output voltages without any layout change. The converter enables an (...)

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This compact, high efficiency reference design with a 54-V DC, 1000-W output targets 5G telecom power and industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit based on the UCC28180, followed by a robust LLC (...)

Reference designs

PMP30629 — Isolated 2.5-W SiC & IGBT gate-drive reference design with integrated switch PSR flyback converter

This reference design provides two isolated voltages from a 24-V DC input supply. By means of zero ohm resistors, it is possible to configure the two independent outputs as +15 V and +4 V, or +15 V and -4 V with common ground with a total power of 2.5 W. The integration of a 100-V rated (...)

Reference designs

TIDA-010048 — Channel-to-channel isolated analog input module reference design

This reference design is a four channel-to-channel, isolated 4–20 mA, current-loop analog input module. The design includes a short circuit, overcurrent, and overvoltage limit function for condition monitoring sensor and module applications. The major features of this analog input module (...)

Reference designs

TIDA-010006 — Isolated IGBT gate-drive power supply reference design with integrated switch PSR flyback controller

This reference design provides isolated positive and negative voltage rails for Insulated Gate Bipolar Transistor (IGBT) gate drivers from a 24-V DC input supply. It uses a flyback power supply topology to generate four pairs of 15-V and –5-V outputs suitable for powering six IGBT gate (...)