The LT8614 is a 4A, 42V input capable synchronous step-down switching regulator. A unique Silent Switcher architecture reduces EMI/EMC emissions by more than 20dB, well below the CISPR 25 Class 5 limit. Even with switching frequencies in excess of 2MHz, synchronous rectification delivers efficiency as high as 96% while Burst Mode operation keeps quiescent current under 2.5μA in no-load standby conditions. Its 3.4V to 42V input voltage range makes it ideal for automotive and industrial applications.
LT8614 – 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current - [Link]
Locally broadcast your cell phone through FM band using MAX2606 from Maxim:
This design idea presents an integrated IF voltage-controlled oscillator (VCO) that can retransmit the audio signal from a cell phone to the FM broadcast band. By placing the cell phone’s speaker near the microphone, the user can use the phone as a hands-free device while driving.
VCO enables a hands-free car kit for cell phones - [Link]
Industry’s Smallest Footprint Package (3mm x 3mm LGA16) and a Low Power Supply (1.8V) Gyroscope
The MAX21002 is a low-power, low-noise, dual-axis angular rate sensor that delivers unprecedented accuracy and sensitivity over temperature and time. It operates with a supply voltage as low as 1.71V for minimum power consumption. It includes a sensing element and an IC interface that provides the measured angular rate to the external world through a digital interface (I2C/SPI).
The IC has a full scale of ±31.25/±62.50/±125/±250/ ±500/±1000 degrees per second (dps) and measures rates with a finely tunable user-selectable bandwidth. The high ODR and the large BW, the low noise at highest FS, together with the low phase delay, make the IC suitable for optical image stabilization (OIS) applications.
The IC is a highly integrated solution available in a compact 3mm x 3mm x 0.9mm plastic land grid array (LGA) package and does not require any external components other than supply bypass capacitors. It can operate over the -40°C to +85°C temperature range.
MAX21002 – Ultra-Accurate, Low Power, Dual-Axis Digital Output Gyroscope - [Link]
Industry’s Only 60V, 2.5A Internal FET Synchronous Buck Converter
The MAX17503 high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs operates over a 4.5V to 60V input. It delivers up to 2.5A and 0.9V to 90%VIN output voltage. Built-in compensation across the output voltage range eliminates the need for external components. The feedback (FB) regulation accuracy over -40°C to +125°C is ±1.1%. The device is available in a compact (4mm x 4mm) TQFN lead(Pb)-free package with an exposed pad. Simulation models are available.
The device features a peak-current-mode control architecture with a MODE feature that can be used to operate the device in pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high efficiency. DCM features constant frequency operation down to lighter loads than PFM mode, by not skipping pulses but only disabling negative inductor current at light loads. DCM operation offers efficiency performance that lies between PWM and PFM modes. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.
4.5V-60V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation - [Link]
ROHM Semiconductor’s SiC (Silicon Carbide) MOSFET offers cost-effective, breakthrough performance in providing low switching loss during high frequency operation. Released by ROHM with designations SCT2080KE and SCH2080KE, these SiC MOSFETs are both 80-milliohm devices, with the SCH2080KE being the industry’s first SiC MOSFET co-packaged with a discrete anti-parallel SiC Schottky Barrier Diode (SBD). The SiC Schottky Barrier Diode (SBD) comprises a forward voltage level three times smaller than that of the body diode. The SCH2080KE is especially popular since it allows board space saving and thus eventually reduces BOM costs.
Compared to its silicon device counterpart such as a Silicon IGBT, the SiC MOSFET has reached a reduced turn-off switching loss of up to 90% because of the absence of tail current, yielding a 70-90ns ON/OFF times and allowing for switching frequencies in the hundreds of kilohertz (kHz) range. The fast recovery performance of the device’s body diode has reduced the switching loss by 73%, minimizing its chip size and cost. Furthermore, the SiC MOSFET provides simultaneous high voltage resistance, low-on resistance, and high speed switching in applications ranging from industrial equipment such as solar and 3-phase inverters, DC/DC converters, uninterruptible power supplies (UPS), and motor drives to power systems and conditioning. These features enable designers and end users to maximize the SiC MOSFET’s benefit of achieving high efficiency performance during operations.
ROHM’s series of SiC MOSFETs featuring low on-resistance being maintained at high temperature condition have been available in mass production since July of this year. The SCT2080KE and SCH2080KE are available in the TO-247 MOSFET Class package, with the SCT2080KE also available in die form.
ROHM Semiconductor’s SiC Mosfet Technology - [Link]
Low losses, precise design, low power consumption and moreover a very affordable price are one of several reasons saying for the signal relays from Fujitsu.
Despite a big advance in a segment of semiconductors, there are still many reasons for usage of electromechanical relays. Galvanic isolation of a driving signal from a switched signal, resistance to surges, minimum crosstalk among switched signals and a minimal or no distortion are main arguments for a classic relay.
In fact a word “classic” even isn´t appropriate, because development of relays is still in progress and it brings results in a form of small dimensions, higher lifetime, low power consumption, high isolation strength etc., that´s why many modern types overcome their predecessors quite significantly.
We´d like to focus your attention for example to series FTR-B3 and FTR-B4. Both are ultra- miniature with a low power consumption and highly reliable bifurcated gold-plated contacts. A big advantage is, that both series also contain latching types with a „zero“ power consumption, thus requiring only a short pulse at switching. In respect to miniature dimensions and an affordable price, their usage is beneficial not only for a signal transmission, but also for example for driving/ switching of various processes and similar.
Connect a signal without distortion – via a Fujitsu relay - [Link]
Keyboard, display, sensor or other device can be connected by means of Bluetooth modules even without cables.
Many times, it´s more practical to have devices interconnected wirelessly. Whether we need a simpler transfer of values from some sensor or a more complicated data communication between two devices, Bluetooth modules will manage it without a long development. Bluetooth technology with their range of 10m or up to 100m (Class 1) usually suit to many purposes where a cable connection is undesired or even impossible.
Bluetooth modules from company Rayson are based on various Bluetooth chips from a renowned company CSR, which determine main features of a given module. On stock we keep several types for example the favorite BTM-112 (Class 2) or BTM-222 (Class 1). Modules contain their own firmware, so it´s not necessary to know a functionality of given Bluetooth chips in detail, but for the most of applications it is sufficient to use configuration commands sent via UART port.
Versatility of modules is mainly in the fact, that they are able to transfer virtually any data, that´s why they can be used for controlling of peripherals, audio transmission etc. and everywhere, where there range and data transfer speed of Bluetooth protocols are sufficient.
Where a cable can’t, a Bluetooth can - [Link]
Wireless technology IQRF was introduced to you in our recent article „IQRF – a wireless technology which breaks barriers“ and in our SOS webinar „How to integrate wireless technologies into your devices without a long-term programming?”. In the time of publishing of the previous article, was the IQRF Alliance launch in a status of intensive preparation. With pleasure we announce you, that from now it´s possible to deploy IQRF Alliance services and to make your development of wireless applications even easier.
What´s all that about? IQRRF Alliance opens to manufacturers, system integrators and installation companies an opportunity to quickly and cost-effectively make all the electronic products wireless without any programming.
IQRF Alliance focuses on extremely easy integration of smart wireless solutions prevailingly in the segments of Indoor Lighting, Outdoor Lighting, Building, Smart Home Automation and many other. Thanks to the revolutionary and patented concept of Direct Peripheral Access and Hardware Profiles, IQRF Alliance members can simply integrate wireless communication and networking into their devices or systems by a simple circuit of a wireless module with a universal DPA application. This will enhance an existing or just developing product with a possibility to communicate in a wireless network, receive and transmit data. DPA moreover ensures a full compatibility of all products using this protocol. New, fully compatible product can be this way launched on the market within few weeks.
IQRF Alliance members will be able to easily and quickly innovate their devices with a wireless connectivity, incorporate full MESH networking into their systems and to use a portfolio of fully compatible products of other IQRF Alliance members.
All details regarding a membership are available at www.iqrf.org/alliance. Membership is without any membership fees. The only “fee” is a 1000 EUR annual credit, i.e. it´s not a fee but a credit for a purchase of IQRF components (transceivers, development boards and kits,…).
IQRF technology features, description of a new IDE4.13 development environment and a new OS3.04 operating system, as well as advantages of membership in the IQRF Alliance can be uncovered already on 23.10.2013 in our SOS webinar about IQRF.
IQRF Alliance brings programming-free wireless networking - [Link]
Resettable fuses are a very useful complement significantly increasing a safety of devices.
Polyswitch-es provide a big service at protection of devices, where they behave like „resettable“ fuses. How many times it is suitable or necessary to use a fuse in a device, but a relatively bulky fuse socket simply doesn´t have a space in our device (or it would spoil a device design) and we also don´t want to use a PCB fuse holder, because a device would have to be constructed as user accessible… Then and not only then, is the ideal solution to use a Polyswitch. Such „fuses“ are available from various producers (for example also under names Polyfuse, Multifuse), Polyswitch is a trade name of company TE Connectivity/ Raychem, representing a top level in this segment. In a principle, a Polyswitch is a PTC resistor with a Polymeric structure designed for a big change of resistance in a narrow temperature range. Conductive particles are dissipated in an amorphous polumer, which changes its structure at a higher temperature (melts), increases its volume resulting in a rapid increasing of a component resistance. In this point (tripping point) a very rapid increasing of resistance appears, which is high enough, so that a leakage current is practically negligible and won´t cause a damage to a protected circuit. Each Polyswitch has a defined holding current (I hold), nominal resistance at a given temperature and tripping (switch off) current (I trip). By a current flowing through a Polyswitch, it gets calorified (I2R), until a certain current it will reach a level, where a rapid increasing of its resistance appears. An exact current at which this change arises naturally depends also on an ambient temperature (at higher temperature a lower current is sufficient). This behavior is digestedly illustrated on an enclosed graph (Fig.4). In the A region, a Polyswitch is switched off (tripped) and a device is disconnected. In the region B the Polyswitch allows for normal operation (on) at any combination of a current and ambient temperature. In the region C can the component go tripped (off) so to say “anytime” depending on a concrete resistance value of a given piece. Read the rest of this entry »
The LTC4120 from Linear Technology is an all-in-one receiver chip for wirelessly charging battery-powered devices. It measures 3 x 3 mm and requires a pick-up coil at its input and a rechargeable battery at its output. A voltage is induced in the coil when it is in close proximity to the transmitter coil of a separate charging unit.
As well as the convenience of just placing your cell phone on a charging pad, this method is also ideal for hand-held devices that can’t use a conventional plug-in charger for reasons of hygiene or harsh/volatile atmospheres.
The battery charging functions allow for both constant current and constant voltage modes and a programmable float voltage level between 3.5 and 11 V accommodates a wide range of cell chemistries. An external resistor sets the charge current up to a maximum of 400 mA. It senses cell voltage and can initiate a low-voltage preconditioning phase if necessary. [via]
LTC4120 – Novel Contactless Battery Charger Chip - [Link]