Today’s telecom equipment and other high-voltage systems demand greater energy savings than ever before. National’s complete selection of high voltage switching regulators and controllers are optimized to maximize efficiency and deliver robust, reliable performance. These solutions operate from 75V and endure transients of up to 100V, enabling them to directly power low voltage circuitry with no intermediate voltage required. These robust and reliable switchers enhance system efficiencies by up to 3-5% over existing solutions. High-performance switching architectures such as Emulated Current Mode (ECM) and Constant On-time (COT) deliver outstanding voltage regulation and transient response, further enhancing performance and reducing load capacitance requirements, and fixed-frequency operation with synchronization capability helps reduce EMI in noise-sensitive applications such as wireless infrastructure.
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High Voltage Integrated Switching Regulators Featuring the LM5xxx Family
Device
Description
Comments
Design Resources
80V, 2A switch PWM boost
75V, 1A switch PWM boost
75V, 0.5A switch PWM boost
Ideal for flyback and boost topologies, up to 75V input (LM5001, LM5002)
Switching power supply design with the LM5000 continuous mode flyback converter (MathCad files)
AN-1588 LM5001 Evaluation Board
AN-1630 LM5001 Non-Isolated Flyback Evaluation Board
75V, 2.5A step down switching regulator
Emulated current mode control and switching frequency up to 500kHz
42V, 2.5A step down switching regulator
AN-1749 Understanding and Applying Current Mode Control Theory
75V, 500 mA buck
High efficiency and constant-frequency PFM operation ideal for 48V input bias regulators
AN-1298 LM5007 evaluation board (PDF 313KB)
AN-1319 Analysis and design of a hysteretic constant frequency buck regulator using the LM5007 (PDF 436KB)
Application challenges of high-voltage hysteretic buck regulators - LM5007/8 (PDF 144KB)
LM5007 Quick Start Calculator (XLS 359KB)
100V, 400 mA buck
AN-1330 LM5008 Evaluation Board (PDF 342KB)
Application challenges of high-voltage hysteretic buck regulators - LM5007/8 (PDF 144KB)
LM5008 Quick Start Calculator (XLS 357KB)
100V, 150 mA buck
LM5009 Quick Start Calculator (XLS 357KB)
100V, 350 mA Constant On-Time Buck
LM5008A Quick Start Calculator (XLS 359KB)
100V, 150 mA Constant On-Time Buck
LM5009A Quick Start Calculator (XLS 360KB)
42V, 0.5A step down switching regulator
AN-1453 LM25007 Evaluation Board
LM25007 Quick Start Calculator (XLS 350KB)
High voltage 1A step down switching regulator
Integrated N-Channel buck switch and switching frequency can exceed 1 MHz.
AN-1423 LM5010A Evaluation Board
LM5010A Quick Start Calculator (XLS 364KB)
42V, 1.0A step down switching regulator
AN-1431 LM25010 Evaluation Board
LM25010 Quick Start Calculator (XLS 366KB)
42V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit
LM25011 Quick Start calculator (XLS 205KB)
High Voltage 1.4A boost/flyback integrated regulator
Easily implement efficient high voltage Two-Switch Forward and Two-Switch Flyback regulators
LM5015 Isolated Quick Start calculator (XLS 154KB)
LM5015 Non-Isolated Quick Start calculator (XLS 381KB)
AN-1724 Isolated Two-Switch DC-DC Regulator Evaluation Board
AN-1725 Non-Isolated Two-Switch DC-DC Regulator Evaluation Board
75V, 500mA buck
75V, 1.5A buck
75V, 3.0A buck
Emulated Current Mode SimpleSwitcher® regulator
LM557x Quick Start calculator (XLS 230KB)
Emulated Current Mode (ECM) Control and Simple Switcher Buck Regulators
AN-1568 LM5574 Evaluation Board
AN-1569 LM5575 Evaluation Board
AN-1570 LM5576 Evaluation Board
42V, 0.5A buck
AN-1577 LM25574 Evaluation Board
42V, 1.5A buck
AN-1578 LM25575 Evaluation Board
AN-1571 Quick Start Guide for a 1.5 Amp Buck Regulator Using the LM5575 and LM25575
42V, 3.0A buck
RD-128 Reference Design 6-42V input, 5V 3A output
42V, 3A SIMPLE SWITCHER
Upgrade to LM2670
AN-1885 LM22670 Evaluation Board
AN-1888 LM22670 Evaluation Board Inverting Topology and Application Notes
42V, 0.5A SIMPLE SWITCHER
Upgrade to LM2671
AN-1895 LM22671 Evaluation Board
42V, 1A SIMPLE SWITCHER
Upgrade to LM2672
AN-1896 LM22672 Evaluation Board
42V, 3A SIMPLE SWITCHER
Upgrade to LM2673
AN-1894 LM22673 Evaluation Board
42V, 0.5A SIMPLE SWITCHER
Upgrade to LM2674
AN-1895 LM22671 Evaluation Board
42V, 1A SIMPLE SWITCHER
Upgrade to LM2675
AN-1896 LM22672 Evaluation Board
42V, 3A SIMPLE SWITCHER
Upgrade to LM2676
AN-1885 LM22670 Evaluation Board
42V, 5A SIMPLE SWITCHER
Upgrade to LM2677
AN-1892 LM22677 Evaluation Board
42V, 5A SIMPLE SWITCHER
Upgrade to LM2678
AN-1892 LM22677 Evaluation Board
42V, 5A SIMPLE SWITCHER
Upgrade to LM2679
AN-1891 LM22679 Evaluation Board
42V, 2A SIMPLE SWITCHER
Upgrade to LM2680
AN-1911 LM22680 Evaluation Board
High Voltage Controllers Featuring the LM5xxx Family
100V Current mode control Switching Controller
Supports Boost, Flyback and SEPIC
LM5020 PSPICE Model AN-1314 LM5020 Evaluation Board
60V Current mode control Switching Controller
Supports Boost, Flyback and SEPIC
AN-1557 LM5022 Evaluation Board
75V Constant On-Time PFET Buck Switching Controller
Constant on-time regulation requires no loop compensation. Nearly constant operating frequency.
AN-1878 LM5085 Evaluation Board
LM(2)5085 Quick Start Calculator (XLS 393KB)
42V Constant On-Time PFET Buck Switching Controller
Constant on-time regulation requires no loop compensation. Nearly constant operating frequency.
AN-1905 LM25085 Evaluation Board
LM(2)5085 Quick Start Calculator (XLS 393KB)
42V Constant On-Time PFET Buck Switching Controller supporting output voltages as low as 0.9V
Constant on-time regulation requires no loop compensation. Nearly constant operating frequency
AN-1933 LM25085A Evaluation Board
LM25085A Quick Start Calculator (XLS 423KB)
75V Non-Synchronous Buck Controller
Emulated current mode control with frequency dithering to reduce EMI or hiccup mode for overload protection
AN-1913 LM5088 Evaluation Board
LM(2)5088 Quick Start Calculator (XLS 268KB)
42V Non-Synchronous Buck Controller
Emulated current mode control with frequency dithering to reduce EMI or hiccup mode for overload protection
AN-1931 LM25088 Evaluation Board
LM(2)5088 Quick Start Calculator (XLS 268KB)
Wide Range (100V) Synchronous Buck Controller
Emulated current mode control with a robust 3.5A peak gate drive
LM5116 Quick Start Component Calculator (XLS 362KB)
Wide Range (100V) Synchronous Buck Controller
High temperature ceramic package for harsh operating environments
LM5116 Quick Start Component Calculator (XLS 362KB)
Wide Range (42V) Synchronous Buck Controller
42V input max
AN-1617 LM25116 Evaluation Board
3V to 75V buck boost controller
Emulated current mode control and switching frequency up to 500kHz
AN-1819 LM5118 Evaluation Board
LM5118 Quick Start Component Calculator (XLS 247KB)
Dual synchronous controller with oscillator synchronization
Synchronizable switching frequency from 150kHz to 250kHz
AN-1292 LM5642 evaluation board (PDF 2111KB)
Mathcad design files for LM5642
Other High-Voltage Power Solutions
selection guides including National’s analog products guide and communications infrastructure guide.
High Voltage Application Notes
AN-556 - Introduction to power supplies (pdf 159 Kbytes)AN-558 - Introduction to power MOSFETs and their applications (pdf 258 Kbytes)AN-1095 - Design of isolated converters using SIMPLE SWITCHER® (pdf 398 Kbytes)AN-1149 - Layout guidelines for switching power supplies (pdf 113 Kbytes)AN-1187 - Leadless leadframe package (LLP) (pdf 1395 Kbytes)AN-1197 - Selecting inductors for buck converters (pdf 371 Kbytes)AN-1246 - Stresses in wide input DC-DC converters (pdf 272 Kbytes)
LM5010 High Voltage 1A Step Down Switching RegulatorLM5010A High Voltage 1A Step Down Switching RegulatorLM5009 150 mA, 100V Step-Down Switching RegulatorLM5008 High voltage buck converterLM5007 High voltage buck converterLM5000 High voltage boost/flyback converterLM5005 High voltage buck converter
High Voltage Online Seminars
Hot Swap Applications: Featuring the LM5069 Hot Swap Controller
Half-Bridge Power Converter Design Using the LM5035
High Voltage Switching Power Supply Topologies and Power Management I.C.s
Topics covered in this online seminar include:
Applications of switching power supplies
Requirements of high voltage power management I.C.s
Non-isolated high voltage topologies and power management I.C.s
Isolated high voltage topologies and power management I.C.s
Push-pull and bridge converter comparison
Mar 20, 2006 - National Semiconductor Introduces 100V Half-Bridge PWM Controller with Industry’s Highest Level of IntegrationMar 20, 2006 - National Semiconductor Introduces Industry's First Single-Chip Power over Ethernet Controller for Higher-Power PoE ApplicationsOct 18, 2005 - National Semiconductor Introduces Industry’s First Average-Program Load-Share ControllerOct 11, 2005 - National Semiconductor Releases Industry's Most Advanced Controller for Forward Active Clamp Reset ConvertersSep 13, 2005 - National Semiconductor Introduces Industry's First 75V, 2.5A, Integrated Buck RegulatorJun 01, 2005 - National Semiconductor Introduces Energy-Efficient, Integrated AC-DC PWM Controller For Power SystemsMar 07, 2005 - National Semiconductor Introduces Industry's First Secondary Side Post Regulator Capable of Operating as Stand-alone Buck RegulatorMar 07, 2005 - National Semiconductor Introduces New Family of 100 V Dual Interleaved PWM ControllersFeb 02, 2005 - National Semiconductor Expands LM5100 Driver Family with New High-Voltage Gate Driver
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