LM51551-Q1

ACTIVE

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

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Product details

Parameters

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, 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 open-in-new Find other Boost controllers (external switch)

Package | Pins | Size

WSON (DSS) 12 6 mm² 3 x 2 open-in-new Find other Boost controllers (external switch)

Features

  • 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
open-in-new Find other Boost controllers (external switch)

Description

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.

open-in-new Find other Boost controllers (external switch)
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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) Jan. 07, 2021
Functional safety information LM5155-Q1, LM51551-Q1 Functional Safety FIT Rate and Failure Mode Distribution Feb. 05, 2020
Application note How to design an isolated flyback using LM5155 Feb. 05, 2019
Application note How to Design a Boost Converter Using LM5155 Dec. 17, 2018
User guide LM5155EVM-BST User's Guide Dec. 11, 2018
Technical article How to add overvoltage protection to a synchronous boost controller Sep. 17, 2018
User guide LM5155EVM-FLY User's Guide Aug. 02, 2018
User guide LM5155EVM-SEPIC User's Guide Aug. 02, 2018

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
59
Description

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 (...)

Features
  • Input voltage range: 6V to 18V
  • Output voltage 24V at 2A
  • 440kHz switching frequency
  • External clock synchronization
EVALUATION BOARD Download
document-generic User guide
59
Description
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 (...)
Features
  • Input voltage range: 18V to 36V
  • Isolated output voltage 5V at 4A
  • Switching frequency 250kHz
  • Two layer PCB with single sided component population
  • Hiccup mode short circuit protection
EVALUATION BOARD Download
document-generic User guide
75
Description
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.
Features
  • Input voltage range: 3V to 42V
  • Output voltage 12V, up to to 2A
  • Switching frequency 2.2 MHz
  • Two layer PCB with single sided component population

Design tools & simulation

SIMULATION MODEL Download
SNVMBL2E.ZIP (204 KB) - PSpice Model
SIMULATION MODEL Download
SNVMBV7.ZIP (52 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVMBV8.TSC (1162 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVMBY3B.ZIP (81 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOL Download
SNVC224A.ZIP (3484 KB)
CALCULATION TOOL Download
SNVC240.ZIP (5304 KB)
CALCULATION TOOL Download
SNVR481.ZIP (1265 KB)

Reference designs

REFERENCE DESIGNS Download
Four output flyback bias converter reference design for inverter and motor drive applications
PMP22771 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive four-rails 17-W isolated flyback reference design
PMP30700 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Tiny automotive SEPIC reference design
PMP30805 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
40-V to 80-V adjustable output voltage boost reference design for LIDAR applications
PMP21629 — 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WSON (DSS) 12 View options

Ordering & quality

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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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