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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) 0.45 Features Adjustable Current Limit, Frequency Synchronization, Power Good, UVLO Adjustable Duty cycle (Max) (%) 93 TI functional safety category Functional Safety-Capable Type Controller Rating Catalog Operating temperature range (C) -40 to 125 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

  • 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

All trademarks are the property of their respective owners.

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Description

The LM5155x ( LM5155 and LM51551 ) device 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 device 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 internal VCC regulator also supports BIAS pin operation up to 45 V (50-V absolute maximum). The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response.

The device features a 1.5-A standard MOSFET driver and a low 100-mV current limit threshold. The device also supports the use of an external VCC supply to improve efficiency. Low operating current and pulse-skipping operation improve efficiency at light loads.

The device has built-in protection features such as cycle-by-cycle current limit, overvoltage protection, line UVLO, and thermal shutdown. Hiccup mode overload protection is available in the LM51551 device option. Additional features include low shutdown IQ, programmable soft start, programmable slope compensation, precision reference, power-good indicator, and external clock synchronization.

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Technical documentation

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Type Title Date
* Datasheet LM5155x 2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller datasheet (Rev. B) Jan. 31, 2020
Application notes LM5155x FIT Rate and Failure Mode Distribution Feb. 04, 2020
Application notes How to design an isolated flyback using LM5155 Feb. 05, 2019
Application notes How to Design a Boost Converter Using LM5155 Dec. 17, 2018
User guides LM5155EVM-BST User's Guide Dec. 11, 2018
Technical articles How to add overvoltage protection to a synchronous boost controller Sep. 17, 2018
User guides LM5155EVM-FLY User's Guide Aug. 02, 2018
Application notes Improve High-Current DC/DC Regulator EMI Performance for Free With Optimized Pow Nov. 13, 2017

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$59.00
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 BOARDS Download
document-generic User guide
$59.00
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 BOARDS Download
document-generic User guide
$75.00
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

Software development

SUPPORT SOFTWARE Download
SNVC240.ZIP (5304 KB)

Design tools & simulation

SIMULATION MODELS Download
SNVMBL2D.ZIP (217 KB) - PSpice Model
SIMULATION MODELS Download
SNVMBV7.ZIP (52 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVMBV8.TSC (1162 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMBY3.ZIP (80 KB) - PSpice Model
GERBER FILES Download
SNVC224.ZIP (3631 KB)

Reference designs

REFERENCE DESIGNS Download
6-W dual-output SEPIC converter reference design
PMP40488 — This reference design employs LM5155 Boost/Flyback/SEPIC controller to provide 6-W outputs with dual-output SEPIC topology. The input is 12-VDC, and outputs are ±60 V/50 mA. The switching frequency is set at 500k Hz. This design achieves 88.2% peak efficiency. The cross regulation of -60-V (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
70-W flyback and 37-W boost power reference design
PMP22151 — This reference design uses two LM5155 devices to make a flyback and boost power stage. The flyback creates an isolated 28 Vdc bus from a 24 +/-10% Vdc bus and the boost creates a 37 Vdc bus from the output of the flyback. The flyback can be loaded up to 70 W and the boost can be loaded up to 37-W (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
9~60-Vdc input, 12-V/2-A output flyback reference design
PMP40555 — This reference design is a wide input, 12-V/2-A output isolated flyback converter using LM5155. The switching frequency is 250 kHz and the peak efficiency of the system is 89.19% at 24-V input. The load regulation in the whole input range is within ±0.5%. Peak-to-peak ripple of the output is (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
36~57-Vdc input, 5-V/4-A output isolated flyback with synchronous rectification reference design
PMP40569 — This reference design is a 36~57-Vdc input, 5-V/4-A output isolated flyback converter using LM5155 and UCC24612. The switching frequency is 250 kHz. With the synchronous rectification controller UCC24612 and a MOSFET at the secondary side, the system achieves 89.29% peak efficiency at 36-V input (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Type-3 IEEE802.3bt-ready flyback converter PoE powered device reference design
TIDA-050023 — This design showcases a low cost, Type-3, Class 6, 51W flyback converter for powered devices through Power over Ethernet. The TPS2373-3 PD controller provides detection and classification while also powering up the LM51551-Q1 PWM controller through its advanced startup feature. This design takes in (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WSON (DSS) 12 View options

Ordering & quality

Support & training

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