Product details

Vin (Max) (V) 42 Vin (Min) (V) 4.5 Iout (Max) (A) 1.5 Features UVLO Adjustable, Enable, Integrated Switch, Light Load Efficiency, Pre-Bias Start-Up Operating temperature range (C) -40 to 150 Regulated outputs (#) 1 Package type WSON TI functional safety category Functional Safety-Capable
Vin (Max) (V) 42 Vin (Min) (V) 4.5 Iout (Max) (A) 1.5 Features UVLO Adjustable, Enable, Integrated Switch, Light Load Efficiency, Pre-Bias Start-Up Operating temperature range (C) -40 to 150 Regulated outputs (#) 1 Package type WSON TI functional safety category Functional Safety-Capable
WSON (NGU) 8 16 mm² 4 x 4
  • Designed for reliable and rugged applications
    • Wide input voltage range of 4.5 V to 42 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 VOUT 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 65-V, 0.4-Ω power MOSFET
    • No opto-coupler or transformer auxiliary winding required for VOUT 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 42 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 VOUT 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 65-V, 0.4-Ω power MOSFET
    • No opto-coupler or transformer auxiliary winding required for VOUT 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 LM25180 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to 42 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 65-V power MOSFET provides output power up to 7 W with enhanced headroom for line transients.

The LM25180 flyback converter is available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin pitch.

The LM25180 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 LM25180 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to 42 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 65-V power MOSFET provides output power up to 7 W with enhanced headroom for line transients.

The LM25180 flyback converter is available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin pitch.

The LM25180 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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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 (...)
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 (...)
In stock
Limit: 2
Calculation tool

LM25180DESIGN-CALC — LM25180 PSR flyback quickstart design tool

Welcome to the LM25180 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 LM25180 PSR flyback converter. As such, the user can expeditiously arrive at an optimized design to meet the application (...)
PCB layout

LM5180EVM-S05 PCB Layout Files

SNVC233.ZIP (1903 KB)
PCB layout

LM5180EVM-DUAL PCB Layout Files

SNVR472.ZIP (3416 KB)
Reference designs

TIDA-01535 — Reference design for power-isolated ultra-compact analog output module

This single-channel, power-isolated, analog output module reference design delivers current and voltage outputs using the highly-integrated DAC8771 digital-to-analog converter (DAC). The high integration of the DAC8771 coupled with the LM25180 primary-side regulated flyback converter lead to a (...)
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 (...)
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WSON (NGU) 8 View options

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