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LM5155

ACTIVE

2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller

Product details

Topology Boost, Flyback, SEPIC Vin (min) (V) 1.5 Vin (max) (V) 45 Vout (min) (V) 1.5 Vout (max) (V) 300 Regulated outputs (#) 1 Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 2200 Iq (typ) (mA) 0.45 Features Adjustable current limit, Frequency synchronization, Nonsynchronous rectification, Power good, UVLO adjustable Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable Rating Catalog Operating temperature range (°C) -40 to 125 Type Controller
Topology Boost, Flyback, SEPIC Vin (min) (V) 1.5 Vin (max) (V) 45 Vout (min) (V) 1.5 Vout (max) (V) 300 Regulated outputs (#) 1 Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 2200 Iq (typ) (mA) 0.45 Features Adjustable current limit, Frequency synchronization, Nonsynchronous rectification, Power good, UVLO adjustable Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable Rating Catalog Operating temperature range (°C) -40 to 125 Type Controller
WSON (DSS) 12 6 mm² 3 x 2
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Wide input operating range for battery applications
    • 3.5-V to 45-V operating range
    • 2.97-V to 16-V when BIAS = VCC
    • Minimum boost supply voltage 1.5 V when BIAS ≥ 3.5 V
    • Input transient protection up to 50 V
  • Minimized battery drain
    • Low shutdown current (I Q ≤ 2.6 µA)
    • Low operating current (I Q ≤ 480 µA)
  • Small solution size and low cost
    • Maximum switching frequency of 2.2 MHz
    • 12-Pin WSON package (3 mm × 2 mm)
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
  • Higher efficiency with low-power dissipation
    • 100-mV ±7% Low current limit threshold
    • Strong 1.5-A peak standard MOSFET driver
    • Supports external VCC supply
  • Avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Dynamically programmable switching frequency from 100 kHz to 2.2 MHz
  • Integrated protection features
    • Constant peak current limiting over input voltage
    • Optional hiccup mode short-circuit protection (see the Device Comparison Table)
    • Programmable line UVLO
    • OVP protection
    • Thermal shutdown
  • Accurate ±1% accuracy feedback reference
  • Programmable extra slope compensation
  • Adjustable soft start
  • PGOOD indicator
  • Create a custom design using the LM5155x with the WEBENCH power designer
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Wide input operating range for battery applications
    • 3.5-V to 45-V operating range
    • 2.97-V to 16-V when BIAS = VCC
    • Minimum boost supply voltage 1.5 V when BIAS ≥ 3.5 V
    • Input transient protection up to 50 V
  • Minimized battery drain
    • Low shutdown current (I Q ≤ 2.6 µA)
    • Low operating current (I Q ≤ 480 µA)
  • Small solution size and low cost
    • Maximum switching frequency of 2.2 MHz
    • 12-Pin WSON package (3 mm × 2 mm)
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
  • Higher efficiency with low-power dissipation
    • 100-mV ±7% Low current limit threshold
    • Strong 1.5-A peak standard MOSFET driver
    • Supports external VCC supply
  • Avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Dynamically programmable switching frequency from 100 kHz to 2.2 MHz
  • Integrated protection features
    • Constant peak current limiting over input voltage
    • Optional hiccup mode short-circuit protection (see the Device Comparison Table)
    • Programmable line UVLO
    • OVP protection
    • Thermal shutdown
  • Accurate ±1% accuracy feedback reference
  • Programmable extra slope compensation
  • Adjustable soft start
  • PGOOD indicator
  • Create a custom design using the LM5155x with the WEBENCH power designer

The LM5155x (LM5155 and LM51551) is a wide input range, non-synchronous boost controller that uses peak current mode control. The device can be used in boost, SEPIC, and flyback topologies.

The LM5155x can start up from a 1-cell battery with a minimum of 2.97 V if the BIAS pin is connected to the VCC pin. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V.

The LM5155x (LM5155 and LM51551) is a wide input range, non-synchronous boost controller that uses peak current mode control. The device can be used in boost, SEPIC, and flyback topologies.

The LM5155x can start up from a 1-cell battery with a minimum of 2.97 V if the BIAS pin is connected to the VCC pin. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V.

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Technical documentation

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Type Title Date
* Data sheet LM5155x 2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller datasheet (Rev. E) PDF | HTML 09 May 2023
Technical article Isolating a SEPIC PDF | HTML 26 Feb 2024
Technical article Compensating for diode drop variations PDF | HTML 21 Feb 2024
Technical article Get more boost from your boost converter PDF | HTML 21 Dec 2023
Application note How to Implement the Soft Start in a Flyback PDF | HTML 10 Jul 2023
Application note LM5155를 사용하여 절연 플라이백을 설계하는 방법 (Rev. A) PDF | HTML 06 Feb 2023
Application note IEEE 802.3cg 10BASE-T1L Power over Data Lines Powered Device Design (Rev. A) PDF | HTML 02 Jun 2022
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Application note How to Design an Isolated Flyback Using LM5155 (Rev. A) PDF | HTML 05 Jan 2021
Functional safety information LM5155x FIT Rate and Failure Mode Distribution 04 Feb 2020
Application note How to Design a Boost Converter Using LM5155 17 Dec 2018
EVM User's guide LM5155EVM-BST User's Guide 11 Dec 2018
EVM User's guide LM5155EVM-FLY User's Guide 02 Aug 2018
EVM User's guide LM5155EVM-SEPIC User's Guide PDF | HTML 02 Aug 2018
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout 13 Nov 2017

Design & development

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

Evaluation board

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Evaluation board

LM5155EVM-BST — LM5155 Boost Controller Evaluation Module

The LM5155EVM-BST evaluation module showcases the features and performance of the LM5155, wide input non-synchronous boost controller. The standard configuration is designed to provide a regulate output of 24V at 2A from an input of 6V to 18V, switching at 440 kHz.

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Evaluation board

LM5155EVM-FLY — LM5155 Flyback Controller Evaluation Module

The LM5155EVM-FLY evaluation module showcases the features and performance of the LM5155 as a wide input non-synchronous flyback controller. The standard configuration is designed to provide a regulated output of 5V at 4A from an input of 18V to 36V, switching at 250 kHz. This evaluation module is (...)
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Evaluation board

LM5155EVM-SEPIC — LM5155 SEPIC evaluation module

The LM5155EVM-SEPIC evaluation module showcases the features and performance of the LM5155 as wide input non-synchronous SEPIC controller. The standard configuration is designed to provide a regulated output of 12V at up to 2A from an input of 3V to 42V, switching at 2.2 MHz.
User guide: PDF | HTML
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Simulation model

LM5155-Q1 PSpice Transient Model (unencrypted) (Rev. F)

SNVMBL2F.ZIP (204 KB) - PSpice Model
Simulation model

LM5155-Q1 PSpice Transient Model (unencrypted) (Rev. H)

SNVMBL2H.ZIP (206 KB) - PSpice Model
Simulation model

LM5155-Q1 TINA-TI STARTUP REFERENCE DESIGN

SNVMBV8.TSC (1162 KB) - TINA-TI Reference Design
Simulation model

LM5155-Q1 TINA-TI TRANSIENT SPICE MODEL

SNVMBV7.ZIP (52 KB) - TINA-TI Spice Model
Simulation model

Unencrypted LM5155-Q1 PSpice Average Model (Rev. B)

SNVMBY3B.ZIP (81 KB) - PSpice Model
Calculation tool

SNVC224 LM5155/56 Boost Controller Quick Start Calculator

Supported products & hardware

Supported products & hardware

Products
Boost controllers (external switch)
LM5155 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller LM5155-Q1 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified LM51551 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with hiccup LM51551-Q1 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, hiccup mode protection LM5156 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM51561 2.2MHz Wide Input Nonsynchronous Boost,SEPIC,Flyback Controller with Spread Spectrum LM51561-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM5156H 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156H-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum
Hardware development
Evaluation board
LM5155EVM-BST LM5155 Boost Controller Evaluation Module
Calculation tool

SNVC240 LM5155/56 Flyback Controller Quick Start Calculator

LM5155/56 Flyback Controller Quick Start Calculator
Supported products & hardware

Supported products & hardware

Products
Boost controllers (external switch)
LM5155 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller LM5155-Q1 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified LM51551 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with hiccup LM51551-Q1 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, hiccup mode protection LM5156 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM51561 2.2MHz Wide Input Nonsynchronous Boost,SEPIC,Flyback Controller with Spread Spectrum LM51561-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM51561H 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM51561H-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM5156H 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156H-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum
Hardware development
Evaluation board
LM5155EVM-FLY LM5155 Flyback Controller Evaluation Module LM5156HEVM-FLY LM5156H flyback controller evaluation module
Calculation tool

SNVR481 LM5155/56 SEPIC Controller Quick Start Calculator

Supported products & hardware

Supported products & hardware

Products
Boost controllers (external switch)
LM5155 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller LM5155-Q1 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified LM51551 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with hiccup LM51551-Q1 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, hiccup mode protection LM5156 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM51561 2.2MHz Wide Input Nonsynchronous Boost,SEPIC,Flyback Controller with Spread Spectrum LM51561-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM5156H 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156H-Q1 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum
Hardware development
Evaluation board
LM5155EVM-SEPIC LM5155 SEPIC evaluation module
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

PMP40679 — 9.8~13.5-V input, 46-V 300-W output interleave boost reference design

This reference design is a 300-W power output interleaving combination of two boost converters using LM5155 controller. Each converter outputs continuous 150-W and 200-W peak. A LMC555 circuit generates 150k-Hz square wave signal and its anti-phase signal for synchronous clock for the two LM5155, (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP40488 — 6-W dual-output SEPIC converter reference design

This reference design employs LM5155 Boost/Flyback/SEPIC controller to provide 6-W outputs with dual-output SEPIC topology. The input is 12-VDC, and outputs are ±60 V/50 mA. The switching frequency is set at 500k Hz. This design achieves 88.2% peak efficiency. The cross regulation of -60-V (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP30805 — Tiny automotive SEPIC reference design

This tiny automotive SEPIC reference design contains a 6-W auxiliary power supply and is designed for a 12-V bias rail. The wide input accepts cranking down to 4.5 Vmin and surge up to 40 Vmax. Due to switching frequency of 2 MHz, the dual inductor is fairly small, resulting in excellent dynamic (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP22151 — 70-W flyback and 37-W boost power reference design

This reference design uses two LM5155 devices to make a flyback and boost power stage. The flyback creates an isolated 28 Vdc bus from a 24 +/-10% Vdc bus and the boost creates a 37 Vdc bus from the output of the flyback. The flyback can be loaded up to 70 W and the boost can be loaded up to 37-W. (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP40555 — 9- to 60-VDC input, 12-V and 2-A output flyback reference design

This reference design is a wide input, 12-V and 2-A output isolated flyback converter using LM5155. The switching frequency is 250 kHz and the peak efficiency of the system is 89.19% at 24-V input. The load regulation in the input range is within ±0.5%. Peak-to-peak ripple of the output is (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP40569 — 36~57-Vdc input, 5-V/4-A output isolated flyback with synchronous rectification reference design

This reference design is a 36~57-Vdc input, 5-V/4-A output isolated flyback converter using LM5155 and UCC24612. The switching frequency is 250 kHz. With the synchronous rectification controller UCC24612 and a MOSFET at the secondary side, the system achieves 89.29% peak efficiency at 36-V input, (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-050023 — Type-3 IEEE802.3bt-ready flyback converter PoE powered device reference design

This design showcases a low cost, Type-3, Class 6, 51W flyback converter for powered devices through Power over Ethernet. The TPS2373-3 PD controller provides detection and classification while also powering up the LM51551-Q1 PWM controller through its advanced startup feature. This design takes in (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
WSON (DSS) 12 View options

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