Product details

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, Power Good, UVLO Adjustable Duty cycle (Max) (%) 93 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (C) -40 to 150
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, Power Good, UVLO Adjustable Duty cycle (Max) (%) 93 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (C) -40 to 150
WSON (DSS) 12 6 mm² 3 x 2
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C TA
  • 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 (IQ ≤ 2.6 µA)
    • Low operating current (IQ ≤ 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
    • 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 TA
  • 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 (IQ ≤ 2.6 µA)
    • Low operating current (IQ ≤ 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
    • 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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Type Title Date
* Data sheet LM5155x-Q1 2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller datasheet (Rev. E) 07 Jan 2021
Functional safety information LM5155-Q1, LM51551-Q1 Functional Safety FIT Rate and Failure Mode Distribution 05 Feb 2020
Technical article How semiconductor technologies are changing automotive lighting roadmaps 24 Oct 2019
Application note How to design an isolated flyback using LM5155 05 Feb 2019
Technical article Designing a smarter sunroof 10 Jan 2019
Application note How to Design a Boost Converter Using LM5155 17 Dec 2018
User guide LM5155EVM-BST User's Guide 11 Dec 2018
Technical article How to add overvoltage protection to a synchronous boost controller 17 Sep 2018
User guide LM5155EVM-FLY User's Guide 02 Aug 2018
User guide LM5155EVM-SEPIC User's Guide 02 Aug 2018
Application note 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

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 (...)

In stock
Limit: 5
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 (...)
In stock
Limit: 5
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.
In stock
Limit: 2
Simulation model

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

SNVMBL2E.ZIP (204 KB) - PSpice Model
Simulation model

LM5155-Q1 TINA-TI TRANSIENT SPICE MODEL

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

LM5155-Q1 TINA-TI STARTUP REFERENCE DESIGN

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

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

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

LM5155/56 Flyback Controller Quick Start Calculator

SNVC240.ZIP (5304 KB)
Calculation tool

LM5155/56 SEPIC Controller Quick Start Calculator

SNVR481.ZIP (1265 KB)
Reference designs

TIDA-020009 — Automotive dual stage (SEPIC + Linear) static LED driver module reference design for rear-lights

This reference design details a solution for driving LEDs in an automotive rear-light application such as a rear combination lamp (RCL). It features linear LED drivers for different rear light light functions and the LED drivers are powered by a single ended primary inductance converter (SEPIC) (...)
Reference designs

PMP30691 — Automotive 8-W primary side regulated flyback with multi-output rails reference design

This reference design provides an isolated automotive power supply that can be connected directly to the battery and is primarily targeted to supply gate driver in HEV/EV applications. It provides up to 8-W output power and offers a small footprint solution of 50.4 mm x 21.7 mm. The transformer (...)
Reference designs

PMP22155 — High voltage inverting buck-boost converter reference design for ADAS applications

This non-isolated design supplies an adjustable output voltage between -150-V and -250-V at 10-mA for LIDAR applications. It operates over an automotive input voltage range of 6-V to 40-V and accepts a control voltage from 0-V to 3-V for output voltage adjustment. Utilizing a single inductor and (...)
Reference designs

PMP22170 — Two output flyback power supply reference design for EV motor/generator inverter applications

This flyback converter reference design supplies a non-isolated 5-V/0.25-A regulated output and an isolated 10-V/1.5-A unregulated output voltage. It uses primary-side regulation to reduce component count and operates over a wide automotive input voltage range of 5 V to 40 V. 
Reference designs

PMP21883 — Four-output, SEPIC converter-bias power supply reference design for solar panel applications

This reference design supplies two non-isolated and two isolated output voltages. It references a regulated 3.3-V/0.25-A and an unregulated 12-V/0.05-A output on the primary-side, and it isolates two 12-V/0.025-A unregulated outputs.  The design operates over an input voltage range of 7 V to (...)
Reference designs

PMP30722 — Automotive non-synchronous boost converter with dynamic output voltage scaling reference design

This reference design showcases a non-synchronous boost converter with a 6-V to 18-V (36-Vpeak) input. The output voltage is programmable to 20 V-36 V using a 0-3.3 V PWM signal generated by a signal generator or MCU.
Reference designs

TIDA-020013 — Automotive SPD-SmartGlass™ driver reference design

This reference design details how to drive various forms of electronically dimmable glass, including SPD-SmartGlass™ and APD Glass from a car battery. This illustrates how to make a DC/AC inverter using the LM5155-Q1 boost converter with a charge pump, two UCC27712-Q1 half bridge drivers, (...)
Reference designs

PMP30676 — 24-W nonsynchronous SEPIC pre-regulator reference design for automotive telematics control units

This automotive pre-regulator reference design showcases a nonsynchronous single-ended primary-inductor converter (SEPIC), which covers an input voltage range of 6.0 V to 36 V. The output voltage is 12.0 V with a maximum load current of 2.0 A. The design can operate down to an input voltage of 4.5 (...)
Reference designs

PMP21781 — 30-V to 150-V Adjustable Output Voltage Boost Reference Design for LiDAR Applications

This reference design utilizes a non-synchronous boost controller to provide an adjustable output between 35 V and 150 V. It is capable of delivering a maximum of 85 mA of current to the load. This is an automotive design intended to power various applications, such as LiDAR systems, which require (...)
Reference designs

PMP30523 — Wide input range 3-W power reference design with four outputs

This reference design is a tiny 3-W auxiliary power supply reference design driving four outputs – two of them isolated to power some drivers.  The wide input range is 6 V to 60 V, so 1:10 - here a discrete LDO is needed to expand BIAS voltage for controller LM51551. For lowest EMI, a (...)
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WSON (DSS) 12 View options

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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