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AC/DC & DC/DC converters (integrated FET)

LM5019

ACTIVE

7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator

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Data sheet

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LM5168 ACTIVE 6-V to 120-V wide VIN, 300-mA DC-DC converter with Fly-Buck™ capability FPWM and PFM mode option and low IQ.

LM5019

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck, Flybuck Type Converter Iout (max) (A) 0.1 Vin (min) (V) 7.5 Vin (max) (V) 100 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Enable, Synchronous rectification, UVLO adjustable Control mode Constant on-time (COT) Vout (min) (V) 1.25 Vout (max) (V) 90 Duty cycle (max) (%) 90 Switch current limit (typ) (A) 0.3
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck, Flybuck Type Converter Iout (max) (A) 0.1 Vin (min) (V) 7.5 Vin (max) (V) 100 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Enable, Synchronous rectification, UVLO adjustable Control mode Constant on-time (COT) Vout (min) (V) 1.25 Vout (max) (V) 90 Duty cycle (max) (%) 90 Switch current limit (typ) (A) 0.3
HSOIC (DDA) 8 29.4 mm² 4.9 x 6 WSON (NGU) 8 16 mm² 4 x 4
  • Wide 7.5-V to 100-V input range
  • Integrated 100-mA high-side and low-side switches
  • No schottky required
  • Constant on-time control
  • No loop compensation required
  • Ultra-fast transient response
  • Nearly constant operating frequency
  • Intelligent peak current limit
  • Adjustable output voltage from 1.225 V
  • Precision 2% feedback reference
  • Frequency adjustable to 1 MHz
  • Adjustable undervoltage lockout
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD
  • Create a custom design using the LM5019 with the WEBENCH Power Designer
  • Wide 7.5-V to 100-V input range
  • Integrated 100-mA high-side and low-side switches
  • No schottky required
  • Constant on-time control
  • No loop compensation required
  • Ultra-fast transient response
  • Nearly constant operating frequency
  • Intelligent peak current limit
  • Adjustable output voltage from 1.225 V
  • Precision 2% feedback reference
  • Frequency adjustable to 1 MHz
  • Adjustable undervoltage lockout
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD
  • Create a custom design using the LM5019 with the WEBENCH Power Designer

The LM5019 is a 100-V, 100-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5019 requires no loop compensation, provides excellent transient response, and enables very low step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high-voltage start-up regulator provides bias power for internal operation of the IC and for integrated gate drivers.

A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout.

The LM5019 device is available in WSON-8 and SO PowerPAD-8 plastic packages.

The LM5019 is a 100-V, 100-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5019 requires no loop compensation, provides excellent transient response, and enables very low step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high-voltage start-up regulator provides bias power for internal operation of the IC and for integrated gate drivers.

A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout.

The LM5019 device is available in WSON-8 and SO PowerPAD-8 plastic packages.
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Technical documentation

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Type Title Date
* Data sheet LM5019 100-V, 100-mA Constant On-Time Synchronous Buck / Fly-Buck™ Regulator datasheet (Rev. H) PDF | HTML 12 Aug 2021
Product overview Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications (Rev. A) PDF | HTML 20 Aug 2024
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Functional safety information LM26420-Q1 Functional Safety FIT Rate and Failure Mode Distribution 17 Feb 2020
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
Application brief Powering Drones With a Wide VIN DC-DC Converter (Rev. A) 05 Feb 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Simplifying 100V wide VIN power conversion PDF | HTML 11 Nov 2016
Technical article Create a Fly-Buck™ converter in WEBENCH® Power Designer PDF | HTML 09 Oct 2015
White paper Designing isolated rails on the fly with Fly-Buck™ converters 29 Sep 2015
Analog Design Journal Fly-Buck(TM) converter provides EMC and isolation in PLC applications 29 Jan 2015
Application note AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) 17 Dec 2014
Product overview Fly-Buck™ Solution 19 Nov 2013
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
User guide AN-2204 LM5017 Isolated Supply Evaluation Board (Rev. B) 13 Aug 2013
EVM User's guide AN-2240 LM5019 Isolated Evaluation Board (Rev. A) 30 Apr 2013
User guide LM5019 Buck Evaluation Board (Rev. A) 30 Apr 2013
More literature High-Voltage PoL Power Solutions 30 Jan 2012

Design & development

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

Evaluation board

BOOST-PSEMTHR8-097 — TPS23882 Type-3, 30W, 2-pair, PSE motherboard for 8-port PSE systems

This motherboard is the base board for the PSE Controller ecosystem. The octal channel, TPS23882, IEEE 802.3bt ready PoE PSE controller can be evaluated by using the motherboard (BOOST-PSEMTHR8-097) and TPS23882EVM daughter card (TPS23882EVM-008) (sold separately). The full PoE Evaluation ecosystem (...)
User guide: PDF
Not available on TI.com
Evaluation board

LM5019EVAL — LM5019 Wide Vin Synchronous Buck Regulator Evaluation Board

The LM5019 evaluation board provides the designer with a fully functional buck regulator employing the constant on-time (COT) operating principle. The evaluation board provides a 10V output over an input range of 12.5V to 100V.
User guide: PDF
Not available on TI.com
Evaluation board

LM5019ISOEVAL — LM5019 Isolated Bias Supply Evaluation Board

The LM5019ISOEVAL evaluation board facilitates evaluation of the LM5019 100V, 100mA Constant On-Time Synchronous Buck Regulator. An isolated bias supply is implemented in this evaluation board with the LM5019 the Constant On-Time regulator. The LM5019 regulator integrates both the high and low (...)
User guide: PDF
Not available on TI.com
Simulation model

LM5019 PSpice Transient Model

SNVM045.ZIP (39 KB) - PSpice Model
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Simulation model

LM5019 Unencrypted PSpice Transient Model

SNVMAM4.ZIP (2 KB) - PSpice Model
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Calculation tool

FLYBUCK-FLYBACK-DESIGN-CALC — Flybuck / Flyback Calculator

This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM3017 — High Efficiency Low-Side Controller with True Shutdown LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current LM3481 — 2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback LM3481-Q1 — 2.97-V to 48-V high-efficiency controller for boost, SEPIC and flyback, AEC-Q100 qualified LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current LM3524D — 40V, 0.2A 350KHz PWM controller LM3578A — 2-V to 40-VIN switching regulators in buck, boost, terminal, depending upon the application LM5020 — 13-100V Wide Vin, Current Mode PWM Boost, Flyback, Sepic Controller LM5022 — 6-60V Wide Vin, current mode boost, SEPIC and Flyback controller TL1451 — Dual Pulse-Width-Modulation Control Circuit TL1451A — 3.6V to 50V dual channel controller with Wide input voltage range TL1451A-EP — Enhanced Product Dual Pulse-Width-Modulation Control Circuits TL1451A-Q1 — 3.6-V to 50-V dual-channel PWM controller, AEC-Q100 qualified TL5001 — PWM Controller with wide input range, with ±5% tolerance on reference, operation –20°C to 85°C TL5001A — PWM Controller with wide input range, with ±3% tolerance on reference, operation –20°C to 85°C TL5001A-Q1 — PWM Controller with wide input range, with ±3% tolerance on reference, operation –20°C to 85°C TL5001M — PWM Controller with wide input range, with ±5% tolerance on reference, operation –55°C to 125°C TPS40210-Q1 — 4.5-V to 52-V wide input range current mode boost controller with 700-mV reference voltage TPS40211-Q1 — 4.5-V to 52-V wide input range current mode boost controller with 260-mV reference voltage TPS43000 — Multi-Topology (buck, boost, sepic) High Frequency DC/DC Controller TPS55010 — 2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETS UC2572 — Negative output Flyback pulse width modulator
AC/DC & DC/DC converters (integrated FET)
LM25017 — 7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator LM25018 — 7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator LM25019 — 7.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator LM2577 — 3.5-V to 40-V, 3-A low component count step-up regulator LM2585 — 4-V to 40-V, 3-A step-up wide VIN flyback regulator LM2586 — 4-V to 40-V, 3-A step-up wide VIN flyback regulator with frequency synchronization LM2587 — 4V to 40V, 5A Step-Up Wide Vin Flyback Regulator LM2588 — 4-V to 40-V, 5-A step-up wide VIN flyback regulator with frequency synchronization LM2621 — 1.2V to 14V input voltage, 1A load current, step-up DC-DC LM2623 — 0.8V to 14V input voltage, 2A load current, step-up DC-DC LM2623-Q1 — 0.8-V to 14-V input voltage, 2-A load current, step-up DC/DC, AEC-Q100 qualified LM2735 — 520kHz/1.6MHz space efficient boost and SEPIC DC-DC regulator LM2735-Q1 — 520-kHz, 1.6-MHz space efficient boost and SEPIC DC/DC regulator, AEC-Q100 qualified LM34925 — 7.5-100V Wide Vin, 100mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters LM34926 — 7.5-100V Wide Vin, 300mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters LM34927 — 7.5-100V Wide Vin, 600mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters LM5000 — 3.1-40V Wide Vin, 2A Current Mode Non-Synchronous Boost Regulator LM5001 — 3.1-75V Wide Vin, 1A Current Mode Non-Synchronous Switch Mode Regulator LM5001-Q1 — 3.1-V to 75-V wide VIN, 1-A current mode non-synchronous switch mode regulator LM5002 — 3.1-75V Wide Vin, 0.5A Current Mode Boost, Flyback, Sepic Converter LM5015 — 4.25-75V, Monolithic Two-Switch Forward DC-DC Regulator LM5017 — 7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator LM5018 — 7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator LM5019 — 7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator LM5160 — LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter LM5160-Q1 — Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter LM5160A — LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter LM5161 — Wide Input 4.5-V to 100-V, 1-A Synchronous Buck / Fly-Buck Converter LM78S40 — 1.5A Adjustable Step Up, Step Down or Inverting Regulator TPS55340 — 5-A, 40-V, wide VIN boost, flyback, & SEPIC converter TPS55340-EP — Enhanced integrated, 5-A, 40-V wide input range boost/SEPIC/flyback DC/DC regulator TPS55340-Q1 — Integrated, 5-A 40-V wide input range boost/SEPIC/flyback DC/DC regulator, AEC-Q100 qualified TPS61175 — 3-A ,40V High Voltage Boost Converter with Soft-start and Programmable Switching Frequency TPS61175-Q1 — 3-A, 40-V high voltage boost converter with soft-start and programmable switching frequency
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Calculation tool

LM5019QUICK-CALC — LM5019 Buck Regulator Quick Start Component Calculator

LM5019 Quick Start Calculator is an easy to use excel based design tool for LM5019 based buck converter design. The design tool has all the design equations embedded and an example default design. The user can modify the design input parameters such as the input voltage range, output voltage, load (...)

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM5019 — 7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator
Download
Reference designs

TIDA-00120 — Solar MPPT Charge Controller Reference Design

This design is a 20A Maximum Power Point Tracking (MPPT) solar charge controller created for solar panel inputs corresponding to 12V and 24V panels. The design is targeted for small and medium power solar charger solutions and is capable of operating with 12V/24V panels and 12V/24V batteries up to (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-01411 — Type 2 PoE PSE, 6kV Lightning Surge Reference Design

This reference design provides lightning surge protection solution for Power over Ethernet (PoE) Power Sourcing Equipment (PSE) systems based on TI's TPS23861 PSE controller. The need for implementing such protection will normally depend on the environment in which the PSE is intended to operate (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HSOIC (DDA) 8 Ultra Librarian
WSON (NGU) 8 Ultra Librarian
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Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

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