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, Hiccup mode protection, Power Good, UVLO Adjustable Duty cycle (Max) (%) 93 TI functional safety category Functional Safety-Capable Rating Catalog Operating temperature range (C) -40 to 125
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, Hiccup mode protection, Power Good, UVLO Adjustable Duty cycle (Max) (%) 93 TI functional safety category Functional Safety-Capable Rating Catalog Operating temperature range (C) -40 to 125
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 (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)
    • 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 (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)
    • 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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LM5155 ACTIVE 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller This product does not include hiccup protection mode.
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LM51561H ACTIVE 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup Includes a higher operating input voltage up to 60 V with spread spectrum and an HTSSOP package.

Technical documentation

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Type Title Date
* Data sheet LM5155x 2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller datasheet (Rev. D) 07 Jan 2021
Functional safety information LM5155x FIT Rate and Failure Mode Distribution 04 Feb 2020
Application note How to design an isolated flyback using LM5155 05 Feb 2019
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
Technical article How to add overvoltage protection to a synchronous boost controller 17 Sep 2018
EVM User's guide LM5155EVM-FLY User's Guide 02 Aug 2018
EVM User's guide LM5155EVM-SEPIC User's Guide 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 (...)

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 (...)
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.
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 SEPIC Controller Quick Start Calculator

SNVR481.ZIP (1265 KB)
Reference designs

PMP22764 — Isolated flyback converter (24-V to 56-V/1.25-A) reference design

This reference design utilizes a diode rectified flyback converter for a 24-V input to isolated 56-V/1.25-A output. The LM51551 PWM controller provides the control for the flyback converter, including hiccup mode short circuit protection. This reference design is ideal for when any well-regulated (...)
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 (...)
Package Pins Download
WSON (DSS) 12 View options

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  • Qualification summary
  • Ongoing reliability monitoring

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