Wiring Guidelines for Parametric Measurement Units (PMU)

This application note discusses ways to help system designers apply proper layout techniques and signal routing. The layout and component descriptions will minimize noise pick-up and manage the thermal dissipation in applications using PMUs.

IEEE 802.3af compliant single-port, powered device applications

Power-over-Ethernet (PoE) technology enables power-sourcing equipment (PSE, a switch/router or midspan system) to deliver up to 15W of power to IEEE® 802.3af-compliant powered devices like IP phones and wireless LAN access points. This application note describes how to design a single-port PSE system to meet the IEEE 802.3af signature, classification, and power-management requirements. The single-port PSE in this example is designed using the MAX5922A IC.

Designing a non-isolated flyback LED driver

Using negative voltage charge pumps and analog switches to build DirectDrive video filter amplifiers in audio/video applications

The MAX9503/MAX9505 DirectDrive™ video filter amplifiers integrate an analog switch (MAX9505 only) and a negative charge pump that can be used to improve performance for audio/video applications.

Single NiMH battery simulates the circuit of a lithium battery

This circuit uses a NiMH cell to replace a lithium battery. Its output simulates the discharge characteristic of a lithium (Li+) battery.

Complete solution for low-cost electrical equipment including 12V buck converter

The MAX5953A provides a simple and inexpensive, yet complete, nonisolated power solution for a powered device (PD) in a Power-over-Ethernet (PoE) system. The circuit provides the PD with detection and classification signatures in compliance with the IEEE^SM 802.3af standard, plus programmable inrush-current control, an integrated power switch, a PWM controller, and integrated high- and low-side switches. The buck step-down converter is capable of > 80% conversion efficiency while delivering 12V at 0.85A.

HFRD-26.0: GEPON SFF motherboard

Abstract: High-Frequency Reference Design (HFRD)-26.0 is a Small Form Factor (SFF) host board designed for evaluating GEPON and GPON SFF modules. The host board can be used to test a variety of different modules, but includes additional features for testing, monitoring, and programming HFRD-25.2 (Low-cost GEPON SFF ONT with µC). Features include: SFF MSA Compatible GUI Interface with USB Connection SMA Connectors for High-Speed Data Schematics and Bill of Materials Provided Gerber Files Available

UL certified IEEE 1394 standard single/dual port FireWire protection circuit

This application note describes Maxim's UL® Recognized, IEEE® 1394™, single- and dual-port FireWire® protective circuits. The single-port FireWire protective circuit is designed using the MAX5943A, while the dual-port FireWire protective circuit utilizes the MAX5944. To assist designers with implementing these circuits, this application note details the schematics, PCB layout, and bill of materials for each UL Recognized circuit.

Reference Design for Power over Ethernet (PoE) Midspan or Endpoint Power

This application note presents a reference design for Power-over-Ethernet (PoE) midspan or endpoint insertion. The reference design powers 4 to 192 Ethernet ports, and can be used in stand-alone mode or configured by a system-level microcontroller. Links to firmware and various support documents are provided.

Replace inefficient MR16 halogen lamps with LEDs

Replacing halogen lamps with LEDs in MR16 light fixtures can save substantial energy while reducing electricity and maintenance costs. This application note details the advantages of using LEDs in MR16 fixtures, and it presents an LED driver circuit that enables a 5W white LED with integrated heatsink to replace a 10W halogen bulb in MR16 lamps.

MAX2170/MAX2171 DAB/T-DMB Reference Design

The MAX2170/MAX2171 tuner plus demodulator IC reference design demonstrates a compact daughter board solution for DAB and T-DMB. The design converts VHF-III and L-Band signals to a MPEG-2 transport stream.

Using MAX15005 for power supply and driving of LED application systems

This reference design is a complete application design for an automotive LED application. It utilizes the MAX15005 current-mode controller to boost a standard lead-acid car battery to 21V for driving a string of automotive LEDs.

MAX5066 Reference Design for High-Performance Systems

The MAX5066 high performance dual buck regulator provides outstanding performance. The reference design in this application note depicts a detailed solution with complete schematic, bill of materials, and load-transient-response scope photos.

MAX5073 Dual Buck Converter Reference Design Operating at 2MHz Switching Frequency

The MAX5073 is a dual converter capable of operating as a buck or boost converter. As a dual buck converter, this device can deliver up to 2A and 1A of output current. The reference design focuses on the MAX5073 operating as a buck converter with a switching frequency of 2MHz, which allows the use of smaller passive components and keeps it out of the AM band for automotive applications.

Use a simple voltage regulator circuit to provide a constant voltage to a high-side current monitor

In a typical photodiode current-monitoring application, the voltage drop between the current monitor and the avalanche photodiode (APD) varies with the temperature and current flowing through it, thereby changing the overall gain. This application note describes a regulator circuit that solves this problem by maintaining a constant voltage drop across the current monitor and APD.

Use DS3882 CCFL controller to drive the common circuit of two lights

This application note describes a backlight LCD application in which two adjacent CCFL lamps share a common, low-voltage side lamp connection. This design is found in automotive, industrial, and avionic applications. The article describes how a DS3882 CCFL controller can be used to drive the two CCFL lamps that share a common return.

PoE+ circuits provide 13W to 70W power to powered devices (PDs)

This application note presents a simple, cost-effective, pre-IEEE® 802.3at PoE+ Powered Decice (PD) solution that employs the MAX5941B. The preliminary requirements of PoE+ PDs are discussed, as is the advantage of extending the existing MAX5941B circuit to implement a PoE+ PD. Test results including inrush-current limit, efficiency, output ripple, and dynamic response are presented for a 3.3V, 30W PD.

Power consumption (PD) module reference design based on MAX5941B PWM controller

This application note provides a reference design for an IEEE® 802.3af-compliant, 12.95W adjustable-output powered-device module. Assembled on a 12cm² PCB, the module is based on the MAX5941B PWM controller and includes hot-swap power switching, a DC-DC converter, and a pair of ORing diode bridges for compatibility with an external 12V adapter. This article details the performance of the module and provides a schematic, PCB layout, and components list for the design.

Optimize the load switching function of DS2715 battery charger

Integrating a battery-load switch function into a smart-charger IC greatly benefits low-cost applications. The DS2715 battery-charger IC intelligently senses battery loading after removal of the charge source to seamlessly maintain power to connected loads. This application note details examples of several application circuits that optimize the performance of the DS2715. Specifically, it presents a circuit for applications in which the DS2715 is connected to noncontinuous loads, and a circuit for powering the load directly from batteries.

MAX2160 ISDB-T Reference Design

This reference design for the MAX2160 tuner plus demodulator IC demonstrates a compact daughter-board solution for the ISDB-T standard (single-segment). This design converts UHF band signals (470MHz to 770MHz) to a MPEG-2 transport stream. The solution is intended for portable applications, such as cell-phone TVs and PDAs.