The LT®3651-8.2/LT3651-8.4 are 2-cell, 4A Li-Ion/Polymer battery chargers that operate over a 9V to 32V input voltage range. An efficient monolithic average current mode synchronous switching regulator provides constant current, constant voltage charging with programmable maximum charge current. A charging cycle starts with battery insertion or when the battery voltage drops 2.5% below the float voltage. Charger termination is selectable as either charge current or internal safety timer timeout. Charge current termination occurs when the charge current falls to one-tenth the programmed maximum current (C/10). Timer based termination is typically set to three hours and is user programmable (charging continues below C/10 until timeout).
LT3651-8.2 and 8.4 – Monolithic 4A High Voltage 2-Cell Li-Ion Battery Charger – [Link]
Abstract: The reality of modern, small form-factor ceramic capacitors is a good reminder to always read the data sheet. This tutorial explains how ceramic capacitor type designations, such as X7R and Y5V, imply nothing about voltage coefficients. Engineers must check the data to know, really know, how a specific capacitor will perform under voltage. [by Mark Fortunato]
Temperature and Voltage Variation of Ceramic Capacitors, or Why Your 4.7µF Capacitor Becomes a 0.33µF Capacitor - [Link]
Min Chen writes:
The non-synchronous flyback topology is widely used in isolated power supplies ranging from sub watt power levels to tens of watts. With more green-mode standards emerging around the world, improving light load efficiency and reducing no-load input standby current are more demanding than ever. Unfortunately, the traditional isolated power supplies using optocouplers can no longer achieve the performance requested.
The new LT®8300 builds a 5V/300mA low IQ isolated power supply from a 36V to 72V input with only five external components (input capacitor, output capacitor, transformer, feedback resistor and output diode). Without skimping any performance, the simple LT8300 solution achieves 85% peak efficiency, less than 250µA no-load input standby current, ±1% output load and line regulation, less than 50mV peak-to-peak output voltage ripple and well-behaved transient and startup performance.
Simple and Efficient Sub-2W Isolated Power Supply - [Link]
The LTC6090 is a high voltage precision operational amplifier. The low noise, low bias current input stage is ideal for high gain configurations. The LTC6090 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split ±70V supplies.
The LTC6090 is internally protected against overtemperature conditions. A thermal warning output, TFLAG, goes active when the die temperature approaches 150°C. The output stage can be turned off with the output disable pin OD. By tying the OD pin to the thermal warning output, the part will disable the output stage when it is out of the safe operating area. These pins easily interface to any logic family.
The LTC6090 is available in an 8-lead SO and 16-lead TSSOP with exposed pad for low thermal resistance.
LTC6090 – 140V CMOS Rail-to-Rail Output, Picoamp Input Current Op Amp - [Link]
Integrated Wireless Power Li-Ion Charger Receiver, Qi (WPC) Compliant
Texas Instruments has launched a pair of ICs designed to simplify wireless power solutions for mobile devices, consisting of a single-chip wireless power receiver with integrated battery charger and a ‘free-position’ transmitter that enlarges the charging area by a factor of four.
The bq51050B is the industry’s wireless power receiver compatible with the Wireless Power Consortium (WPC) 1.1 Qi standard. It features an integrated direct battery charger and enables faster, more efficient charging of portable devices. The unique 20-V receiver combines rectification, voltage conditioning, communication control and Li-ion charging capability in a single chip. The inductor-free, single-stage design yields high efficiency and saves up to 60% board space compared to a multi-stage implementation. [via]
Wireless Power Duo Keeps Portable Devices Humming - [Link]
The MAX6070/MAX6071 offer a very low noise and low-drift voltage reference in a small 6-pin SOT23 package. These devices provide a 1/f noise voltage of only 4.8µVP-P at an output voltage of 2.5V, with a temperature drift of 6ppm/°C (max). The devices operate with an input voltage from 2.8V to 5.5V. The MAX6070/MAX6071 consume 150µA of supply current and can sink and source up to 10mA of load current. The MAX6070/MAX6071 provide an initial accuracy of 0.04%. The low-drift and low-noise specifications enable enhanced system accuracy, making these devices ideal for high precision industrial applications. The MAX6070 offers a noise filter option for wideband applications.
MAX6070 MAX6071 – Low-Noise, High-Precision Series Voltage References - [Link]
SKL14 can be used in switch-mode power supplies or as protection diodes and thanks their really miniature dimensions, they are also suitable at the lack of PCB space.
SMT Technologies enable a substantial increase of current density thanks to a very good heat transfer from a component to a PCB. Almost a zero length of „leads“ of SMT components also features another positive aspects like a significant suppression of a parasitic inductancy and a possibility to construct circuits with a high components density and a minimal PCB tracks length, what significantly decreases an undesired radiation (EMI) for example in switch-mode power supplies.
A very small forward voltage drop <0.55V/1A and the speed of Schottky diodes make the SKL14 a universal diode suitable for example for rectifying, for SMPS or as a reverse polarity protection diode. A relatively high current is mainly enabled by a Power SOD-123 package with enhanced thermal properties.
SKL14 – 1A Schottky diode will fit everywhere - [Link]
New family of conectors picoMAX from company Wago is substantially lower than traditional connectors and it is extremely resistant to vibrations.
picoMAX is a vast system of connectors with spring contacts for „wire-to-board“, „wire-to-wire“, „board-to-wire“ but also „panel-feed-through“ connections with very compact dimensions and universal usage, with pinov 3.5mm, 5.0mm and 7.5mm pitch. The biggest construction novelty of the picoMAX series is a new substantially changed design in comparison to a traditional design. New design of a pin+socket contact bridge enabled a significant decreasing of the connector´s height and at the same time a perfect mechanical connection of both parts to each other. It means a significant improvement of resistance to vibrations (up to 20g) in comparison to common connectors. A sturdy connection is further supported by integrated locking latches which avoid disengagement caused by vibrations
A new construction resulted in a very short path for an electric signal, what means a lower contact resistance (contact bridge and pins are from a tin-plated electrolytic copper) and a higher reliability. An absolute reliability of the contact is ensured even at high temperatures, thanks to an innovative clamp technology and an insulation material based on glass fiber reinforced PPA (polyphtalamide). As we might expect at Wago mark – connecting of wire conductors is simple, without specialty tools (only a usual screwdriver is necessary to release a wire) and in praxis there´s no limitation regarding the type or termination of a wire conductor (solid, stranded, fine-stranded, with ferrules, …).
A big plus of the picoMAX series is a diversity. With the picoMAX series we can be sure, that in this family we´ll find mutually compatible types for all connections. Simple and at the same time sophisticated system of coding enables to ensure a correct installation, for example in applications with several connections on one place. Despite of a vast amount of combinations of various connectors, the picoMAX system features a simple and an intuitive application.
picoMAX is also available in the „picoMAX eCOM“ version – a PCB terminal block, which can also be used as a removable connection (plug-in). It is even more compact and economical version with pins without a plastic housing, suitable for applications in which you don´t need all advantages of the picoMAX system.
A complete description of the whole series would require many pages of text. A better and quicker idea will provide to you the attached video, picoMAX flyer and picoMAX catalogue. 3,5mm pitch version (2091-xx) is for wire conductors 0,2-1,5 mm2/10A, 5.0mm pitch version (2092-xx) is for wire conductors 0,2-2,5 mm2/16A/250-630V. 7,5mm pitch version (2092-xx) has similar properties as the previous one, but it has a higher nominal voltage (400-1000V).
picoMAX connectors are usable literally everywhere – in a huge amount of versions will be very probably found the right ones for your application.
Small “big” connectors – Wago picoMAX - [Link]
0.01A, 10mV but even 2A are no problem for the AxW-K series Fujitsu relay. That´s why they´re a reliable component for a linear-undistorted transfer of diverse signals.
AxW-K relay series are well-proven 2-pole relays (DPDT) reliable switching even very small signals, already from 0,01mA/10mV DC, but they won´t be scared of 1A/30VDC (0,5A/125VAC). Reliable switching is ensured by bifurcated silver-based contacts plated by gold. As, circuits for signal processing usually consist of SMD components, neither a relay intended for such applications shoudn´t be too high. With the height of only 5 mm, AxW-K relay series meet this requirement very well and a standard DIL pitch makes their usage and PCB design easier at the same time.
In the AxW-K series can be found several types – with 1.5V – 48V coils, and also bistable (latching) types (with 1 or 2 coils). Types A3W,A5W,AL-D5W-K,A12W and A24W are kept in stock, other types we´re able to provide you upon order. Further features of the AxW-K series relays result from their construction as a classic electromagnetic relay – high isolation, galvanic isolation from a control circuit, ability to transfer small signals without distortion, resistance to various surges and other. Besides telecommunication circuits, AxW-K series relays are ideal for switching of signals from a wide range of industrial detectors and sensors, audio devices and other.
Small signal relay AxW-K won’t refuse any signal - [Link]
The highest power density in a compact SIP package – it is the biggest contribution of TRACOPOWER TMR 6 series isolation DC/DC modules.
6 Watts is already a considerable power. However, thanks to modern technologies in a construction of switch-mode power supplies, neither such a powerful source doesn´t require to reserve a lot of space on a PCB – 2 cm2 are fully sufficient for TRACO TMR 6 na to úplne postačujú 2 cm2. In other words – from this little area a user gains an insulated regulated power supply of for example 5V/1,2A without a need for an additional cooling or other restrictions.
32 types in four voltage ranges (4,5 to 75V) provide eight fully regulated output voltages (3.3, 5.0, 9.0, 12, 15, ±5.0, ±12 and ±15 VDC). For a given application it is only necessary to choose an appropriate type for a required input / output voltage and TMR6 will ensure a reliable regulation even at high changes of input voltage (max. 0,2% output drift at VINMIN to VINMAX). As we are already used to at the Traco Power mark, DC/DC modules are constructed for a continuous operation in industrial environment. They are able to operate in a range of temperatures of -40 to +65°C (without power derating)and they resist to an indefinite short circuit. TMR 6 can be controlled remotely, what decreases its power consumption in a no-load condition and enables a remote switching on/ off of target devices at the same time.
Detailed information will provide you the TMR 6 datasheet.
Guide price is approx. 15 Eur/pce (depending on quantity), MOQ starts already from 1 piece.
6 Watts compressed into a SIP package – TRACO TMR 6 - [Link]