Scalable power modules from digital to 5G


Flex Power Modules designs and manufactures a wide range of isolated DC/DC converters and non-isolated Point of Load (PoL) converters intended primarily, although not exclusively, for the Information and Communications Technology market, including Servers and High-Performance Computing applications. We also offer specialized power module solutions suitable for other markets including RFPA, Industrial & Railway.

Our product portfolio also includes front end Power Interface Modules (PIM) for ATCA and other applications, as well as leading edge engineering design tools, which includes the Flex Power Designer software, which helps support the configuration and control of a wide range of Digital DC/DC Intermediate Bus Converters and Digital PoL converters.

The technology-driven portfolio features ultra-high efficiencies up to 97%, and extremely high reliability, with MTBF figures of up to 50Mhrs. The digital product portfolio offers extensive customer configuration and control capabilities using the open-standard PMBus communication protocol.

Key features include:

  • Nominal Input bus voltages of 3.3V, 5V, 12V, 24V, 48V, 53/54V, 72V, 96V and 110V
  • Power levels per module from 1W to 1.3kW
  • Output currents from 2A to 120A in single modules (offering solutions up to 480A in parallel)
  • Output voltages from 0.5V to 55V


New products and solutions are constantly in development – if you don’t see exactly what you need, please contact us.

Flex digital power designer software

Flex Power Designer Software

Sketch, simulate, configure and monitor your digital power system with the Flex Power Designer software.

                     Free Download


In the News

21IC organizes a roadshow event in 7 Chinese cities and we are having a seminar about Powering your 5G solution in China

10.07.2019/Milpitas, US
Flex is hosting an OCP workshop for Rack & Power. For more info, click here.

25.06.2019/Stockholm, Sweden
Flex Power Modules introduces 500W quarter-brick DC/DC converter for RFPA telecom applications

 Product Information


Product Overview - Analog Point of Load (POLA & DOSA)

POLA Cross Reference List


PMD Series

PMD (2.25-3A)

PMF Series

PMF (10A)

PMG Series

PMG (12-15A)

PMH Series

PMH (18-22A)

PMJ Series

PMJ (26-30A)

Analog Point of Load - PMM Series

PMM (50-60A)

PMN Series

PMN (30A)

PMP Series

PMP (16A)

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PMR (40-50A) 

Double-click to edit alt text and insert image

PMT  (6A)


Product Overview - Analog DC-DC Modules



Design Support Documentation

AN323 - Input Filter Design - 3E POL Regulators

The 3E Digital products can be configured, controlled and monitored through a digital serial interface using the PMBus™ power management protocol. This application note provides information on how to design input filters for the 3E POL regulators.

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AN322 - In-System Programming Guide – 3E Series Power Modules

This application note provides information on communicating with Flex 3E Series Digital Power Modules while they are already placed “in-system”. Specifically, we discuss what changes are available while the power output is enabled, referred to as Operation Changes. We also guide through designing your power system to support in-system configuration updates - allowing you to potentially configure parts without the need of ordering pre-configured products or using a contract manufacturer.

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AN321 - Output Filter Impedance Design - 3E POL Regulators

The 3E Digital products can be configured, controlled and monitored through a digital serial interface using the PMBus™ power management protocol. This application note provides information on how to design the output filter impedance of 3E POL regulators.

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AN320 - Snapshot Parameter Capture – 3E PoL Regulators

The snapshot function enables the user to read comprehensive information of device status and parameters via a single PMBus read transaction. The snapshot function also makes it possible to automatically capture the same parametric data in response to a pending fault, and store that data to Non-volatile Memory (NVM). This can be of great value when making a root cause analysis of a fault situation. 

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AN319 - Repair and Rework Recommendations for Flex Power Modules

In case that a module needs to be replaced on the hosting board, recommended processes and guidelines described in this section should be applied. Instructions are listed after fundamental principles and recommendations for rework processes for power modules. 

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AN318 - Parallel Operation - PKM  4817LNH

The PKM  4817LNH offers passive load sharing allowing multiple products to be connected in parallel. This feature is typically used to increase power output on the same rail, providing redundancy against a product failure, or distribute thermal heat over a larger board area. Paralleling may also aid in streamlining your Bill of Materials by replacing the need for separate products with higher power requirements.  

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AN317 - LGA Design and Assembly Considerations

LGA (Land Grid Array) is a connection method with a grid of contact pads on the connection side of the PCB. The grid of contacts consists of pads without any pre-deposit of solder. Interconnection between an LGA module and a connecting PCB is achieved by printing solder paste on the connecting PCB which will melt during the reflow process and create a solder interconnection between the module and connecting PCB. 

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AN314 - First and Second Generation 3E POL Regulators - A Comparison

This document provides an overview of the differences and compatibility between the first and second generation of 3E digital point-of-load (POL) regulators. This useful information applies both when considering the choice of regulator for a new design and when updating BMR450/451 with BMR462/463/464 in an existing design.

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AN310 - Sequencing Configuration – 3E POL Regulators

The 3E Digital products can be configured, controlled and monitored through a digital serial interface using the PMBus™ power management protocol. This application note provides information on different methods for sequencing of the 3E POL regulators.

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AN309 - Synchronization and Phase Spreading - 3E POL Regulators

In systems with multiple switching products, the switching phase between products may need a delay to reduce undesired effects in the system. This application note provides information on how to synchronize the 3E POL regulators and use phase spreading for optimized performance.

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AN308 - Fault Spreading - 3E PoL Regulators

With the rising complexity and robustness requirements of many systems, the ability to monitor and control the power distribution has become increasingly more critical. This application note provides an introduction to the serial bus interface of the 3E Digital products and accessing the 3E products using a general purpose microcontroller.

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AN307 - Parallel Operation with Load Sharing - 3E POL Regulators

The 3E Digital products can be configured, controlled and monitored through a digital serial interface using the PMBus™ power management protocol.
This application note provides information on how to parallel two or more 3E POL regulators.

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AN306 - Optimizing Load Transient Response For ID & NLR Control Loops – 3E Series Power Modules

This application note provides information on optimizing load transient response performance on Flex 3E Series Digital Power Modules. This app note focuses on Point of Load products that use a digital PID control loop with an additional ‘Non-linear Response’ feature.

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AN304 - Microcontroller Programming for 3E Digital Products

This application note provides an introduction to the serial bus interface of the 3E Digital products and accessing the 3E products using a general purpose microcontroller.

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AN302 - PMBus Command Set - 3E Series Power Modules

Flex’s 3E Series modules are designed with state-of-the-art digital controllers. This provides the user with superior electrical performance and a broad capability to configure,
control and monitor the products in the engineering lab, in the factory, and in the field.

Download PDF

AN206 - Set-Up and Design of the Hold-Up Function with PIM4300

Telecom systems and many other applications require very low ohmic power distribution. To handle short circuits and other power supply interruptions, a hold-up function is included on the majority of the boards in a system.

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DN030 - Powering FPGAs Using Digitally Controlled Point of Load Converters

Field Programmable Gate Arrays (FPGAs) require several high quality power supply lines. Designers experience several challenges when designing FPGA power solutions which are elaborated in this design document. All of these challenges are much easier to accommodate when using digital power technology. Moreover, using digitally-controlled DC/DC converters dramatically reduces the time taken to design the FPGA’s power supply system.

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DN029 - Conducted EMC Filters for Flex Board Mounted Power Supplies

This design note is intended to alleviate confusion regarding EMC requirements by showing how Flex board mounted power supplies, BMPS, can be easily integrated into a wide range of electronic systems while meeting the system level EMC requirements.

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DN028 - Thermal Characterization of Board Mounted Power Supplies in Sealed Box Applications

This design note describes the thermal performance of board mounted power supplies when used in applications with no or limited convection cooling. In these conditions, often referred to as ‘sealed box’ applications, the main part of the power losses is dissipated by conduction through the power supply’s baseplate coupled to a large thermal mass (cold wall).

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DN027 - Test Methods for DC/DC Power Modules

This design note addresses techniques and considerations for accomplishing such testing, and should be used in conjunction with the Technical Specification for the particular product being evaluated as well as other Flex design notes that will be referenced. Contents include precautions that should be kept in mind when testing DC/DC power modules, the appropriate test setup and test equipment, and a procedural outline for performing many of the most common types of tests. By following the guidelines presented here, valid test results that may be compared to the parameters listed in the product Technical Specification will be obtained.

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DN025 - Forced Air Cooling of DC/DC Power Modules at High Altitude

Due to lower air density at higher elevations, the convective heat transfer capabilities of air can vary depending on elevation. For uncontrolled environment this adverse effect is offset by a lower ambient temperature at higher elevations. This Design Note will focus on the relationship between air convective heat transfer and elevation. This should be considered within the context of cooling DC/DC converters and their associated thermal derating curves.

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DN024 - DC/DC Power Modules Basics

This design note covers basic considerations for the use of on-board switch mode DC/DC power modules, also commonly known as BMPS, i.e. board mounted power supplies.

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DN023 - Selection of Architecture for Systems Using Bus Converters and POL Converters

Most telecom and datacom systems now contain integrated high performance processors, ASICs and FPGAs. These systems are characterized by high levels of current demand at multiple low supply voltages, tight regulation requirements, large and fast dynamic currents. This environment leads to the utilization of some type of distributed power architecture (DPA) to supply operating voltages to these circuits rather than using centralized power architecture.

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DN022 - Output Ripple and Noise Measurement Methods for Flex Power Modules

There is no industry-wide standard for measuring output ripple and noise in DC/DC converters. The methods and test setups vary from supplier to supplier, which sometimes can cause confusion. Flex uses methods that give meaningful and reproducible results to the user, but the test methods and assumptions used are not the same for all series of Flex products due to the wide range of power levels and end-use applications.

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DN021 - On/Off Control Using the Remote Control (RC) pin on Flex Power Modules

Most DC/DC converters throughout the industry offer some type of remote control function to enable the converter to be turned on or off by means of an external control signal. While some degree of standardization exists between converter suppliers, the standardization is far from complete.

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DN019 - Thermal Characterization of Flex Power Modules

The latest power modules feature extremely compact form factors and high efficiency operation. The high packaging density is accomplished by using materials with excellent thermal properties in conjunction with extensive attention to the details of thermal design.

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DN015 - 48V On/Off Control Using Remote Control (RC) Pin 

In some applications it is necessary to have a precise turn on and turn off level. The example used in this note is useful for setting turn on and turn off in the range of 36-75 V.

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DN014 - Voltage Monitor Circuit Configuration

In some applications it is necessary to monitor the output voltages and shut down all converters if any of these fails. The examples in this design note shows how to monitor two outputs.

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DN013 - On/Off Control Using Remote Control (RC) Pin

In some applications it is necessary to have a precise turn on and turn off level.

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DN012 - Output Overvoltage Protection with Latching Function

This design note shows how to use the Remote Control (RC) pin of an Flex DC/DC power module to stop the operation when there is an over voltage condition.

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DN007 - Output Voltage Alarm Circuit

This design note shows one example on how to detect output voltage and provide a status signal by using LED diodes.

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DN002 - Reliability Aspects on Power Supplies

As power supplies are the very heart of every electronic equipment, special attention must be paid to their reliability. For other electronics a certain failure mode, at least for a part of the total system, can often be tolerated without serious (critical) after-effects.

Download PDF

25.06.2019 - Flex Power Modules introduces 500W quarter brick DC/DC converter for RFPA telecoms applications

28.05.2019 - Flex Power Modules announces encapsulated sixteenth brick DC/DC converter for industrial/railway and telecom applications

08.05.2019 - Flex Power Modules extends its PKE range of highly reliable and efficient industrial DC/DC converters

24.04.2019 - Flex Power Modules introduces ultra-wide input DC/DC converters for Industrial and Railways applications

19.03.2019 - Flex Power Modules introduces dual output digital PoL for high power density ICT applications

12.03.2019 - Flex Power Modules announces high power 1300 W DC/DC converter in a quarter brick format

05.02.2019 - Flex Power Modules introduces industry's smallest 260 W DC/DC converter in a sixteenth brick footprint

23.01.2019 - Flex Power Modules new DC/DC converters are cost-optimized for high-volume wireless/microwave applications

15.01.2019 - Flex Power Designer adds thermal simulation to cut time to market

09.01.2019 - Flex Power Modules broadens portfolio in industrial and railway sector

19.11.2018 - Flex Power Modules targets emerging Direct Conversion market with class-leading isolated DC-DC converter

17.10.2018 - Flex Power Modules boosts portfolio for RFPA applications with PKB-D 250W DC-DC converter

04.09.2018 - Flex Power Modules debuts ultra-efficient 700W half-brick DC/DC converters to power RFPA applications in LDMOS or GaN

11.07.2018 - Flex Power Modules expands innovative BMR480 DC/DC advanced bus converter series with 1300 Watt rated version

21.05.2018 - Flex Power Modules announces new BGA packaging option for digital point-of-load DC/DC converters







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