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LM5155-Q1

ACTIVE

2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified

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Data sheet

LM5155-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Boost, Flyback, SEPIC Vin (max) (V) 45 Vin (min) (V) 1.5 Vout (max) (V) 300 Vout (min) (V) 1.5 Control mode current mode Features Adjustable current limit, Frequency synchronization, Nonsynchronous rectification, Power good, UVLO adjustable Duty cycle (max) (%) 93 Iq (typ) (A) 0.00045 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
Rating Automotive Topology Boost, Flyback, SEPIC Vin (max) (V) 45 Vin (min) (V) 1.5 Vout (max) (V) 300 Vout (min) (V) 1.5 Control mode current mode Features Adjustable current limit, Frequency synchronization, Nonsynchronous rectification, Power good, UVLO adjustable Duty cycle (max) (%) 93 Iq (typ) (A) 0.00045 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
WSON (DSS) 12 6 mm² (3 mm × 2 mm)
  • 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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Technical documentation

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* Data sheet LM5155x-Q1 2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller datasheet (Rev. F) PDF | HTML May 3, 2023
White paper Isolated Bias Power Supply Architecture for HEV/EV Single Stage Onboard Chargers PDF | HTML Jan 7, 2026
Application brief Avoiding Pulse Skip Operation at Light Load Conditions for Asynchronous Boost Converter Designs PDF | HTML Sep 16, 2025
White paper Isolated Bias Power Supply Architecture for HEV/EV HVLV DCDC Converters PDF | HTML Jan 16, 2025
White paper Isolated Bias Power Supply Architecture for HEV and EV Traction Inverters PDF | HTML Oct 11, 2023
Application note How to Implement the Soft Start in a Flyback PDF | HTML Jul 10, 2023
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators Apr 21, 2021
Application note How to Design an Isolated Flyback Using LM5155 (Rev. A) PDF | HTML Jan 5, 2021
Functional safety information LM5155-Q1, LM51551-Q1 Functional Safety FIT Rate and Failure Mode Distribution Feb 5, 2020
Technical article How semiconductor technologies are changing automotive lighting roadmaps PDF | HTML Oct 24, 2019
Technical article Designing a smarter sunroof PDF | HTML Jan 10, 2019
Application note How to Design a Boost Converter Using LM5155 Dec 17, 2018
Application brief Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout Nov 13, 2017

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 (...)

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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 (...)
User guide: PDF | HTML
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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.
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Simulation model

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

SNVMBL2H.ZIP (206 KB) - PSpice model
Supported products & hardware
Simulation model

LM5155-Q1 TINA-TI STARTUP REFERENCE DESIGN

SNVMBV8.TSC (1162 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

LM5155-Q1 TINA-TI TRANSIENT SPICE MODEL

SNVMBV7.ZIP (52 KB) - TINA-TI Spice model
Supported products & hardware
Simulation model

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

SNVMBY3B.ZIP (81 KB) - PSpice model
Supported products & hardware
Calculation tool

SNVC224 — LM5155/56 Boost Controller Quick Start Calculator

Supported products & hardware
Calculation tool

SNVC240 — LM5155/56 Flyback Controller Quick Start Calculator

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

SNVR481 — LM5155/56 SEPIC Controller Quick Start Calculator

Supported products & hardware

Many TI reference designs include the LM5155-Q1

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