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LM51551-Q1

ACTIVE

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

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) 0.48 Features Adjustable current limit, Frequency synchronization, Hiccup mode protection, Nonsynchronous rectification, Power good, Synchronization, UVLO adjustable Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (°C) -40 to 150 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) 0.48 Features Adjustable current limit, Frequency synchronization, Hiccup mode protection, Nonsynchronous rectification, Power good, Synchronization, UVLO adjustable Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (°C) -40 to 150 Type Controller
WSON (DSS) 12 6 mm² 3 x 2
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C T A
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Wide input operating range for car and portable 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) with wettable flanks and non-wettable flank option
    • 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
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C T A
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Wide input operating range for car and portable 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) with wettable flanks and non-wettable flank option
    • 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-Q1 (LM5155-Q1 and LM51551-Q1) 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-Q1 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-Q1 (LM5155-Q1 and LM51551-Q1) 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-Q1 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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LM5155-Q1 ACTIVE 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified Does not have hiccup mode

Technical documentation

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Type Title Date
* Data sheet LM5155x-Q1 2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller datasheet (Rev. F) PDF | HTML 03 May 2023
White paper Isolated Bias Power Supply Architecture for HEV and EV Traction Inverters PDF | HTML 11 Oct 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 How to Design an Isolated Flyback Using LM5155 (Rev. A) PDF | HTML 05 Jan 2021
Functional safety information LM5155-Q1, LM51551-Q1 Functional Safety FIT Rate and Failure Mode Distribution 05 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

Design & development

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

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.

This EVM is designed for ease of (...)

User guide: PDF
Not available on TI.com
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 (...)
User guide: PDF
Not available on TI.com
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
Not available on TI.com
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

PMP30784 — 2-MHz automotive SEPIC reference design

This SEPIC converter reference design is designed for 2-MHz switching frequency. Applying a high switching frequency to a hard-switched topology results in increased switching losses at FET and rectifier as well as increased core losses and AC losses at the windings. To minimize those losses, the (...)
Test report: PDF
Reference designs

PMP30921 — 4-W discontinuous conduction mode primary-side regulated flyback reference design

This tiny 4-W flyback converter with additional three isolated-output windings generates four total outputs. By windings ratio 1:1 in between primary and auxiliary winding, the conventional RCD snubber can be replaced by an AC flying capacitor providing better efficiency and lower EMI This requires (...)
Test report: PDF
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PMP30951 — Isolated 10-W primary-side regulated (PSR) DCM-flyback reference design

This reference design introduces a tiny isolated auxiliary power supply used to provide automotive IGBT drive. The three isolated outputs support three gate controls. Each output delivers +15 V and –5 V. An additional 10-V output is provided on the primary side. To simplify transformer windings, a (...)
Test report: PDF
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PMP22771 — Four output flyback bias converter reference design for inverter and motor drive applications

This isolated primary regulated flyback converter reference design provides a total of eight output voltages. These outputs consist of four isolated pairs of +18V  and -5.1 V outputs with three pairs capable of 25 mA maximum and one capable of 75 mA maximum. These outputs are designed to (...)
Test report: PDF
Schematic: PDF
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PMP30700 — Automotive four-rails 17-W isolated flyback reference design

This reference design is an isolated flyback that supplies four independent rails; each of them delivers 14 V @ 300 mA. The voltage feedback loop is closed to primary side, therefore, avoiding the optocoupler and increasing the reliability of the converter. The high switching frequency (500 KHz) (...)
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

PMP21629 — 40-V to 80-V adjustable output voltage boost reference design for LIDAR applications

This reference design utilizes a non-synchronous boost controller to provide an adjustable output of between 40 V and 80 V capable of delivering a maximum of 100 mA of current to the load. This is an automotive design intended to power various applications such as LiDAR systems, which require an (...)
Test report: PDF
Schematic: PDF
Package Pins Download
WSON (DSS) 12 View options

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  • Ongoing reliability monitoring

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