Intersil have introduced a single chip just 9 x 6.5 mm which contains just about all the control features (including the output stages) needed to build a dual 0.8 to 5 V power supply with 3 A per channel output capability. The ISL8203M can also supply 6 A in current sharing operation.
The ISL8203M is an integrated step-down power module optimized for generating low output voltages down to 0.8V. The input supply voltage range spans from 2.85 V to 6 V. The two channels are clocked 180° out-of-phase to help reduce input RMS current and EMI. While in current sharing mode this interleaving of the two channels is beneficial for reducing input and output voltage ripple.
Dual 3A PSU on a Chip - [Link]
The LTM4625 from Linear Technology is a switching mode μModule (micromodule) regulator in a tiny 6.25 mm × 6.25 mm × 5.01 mm BGA package. Like many of the newer regulator designs, the package includes the switching controller; power FETs, inductor and support components. Operating over an input voltage range of 4 V to 20 V (or 2.375 V to 20 V with an external bias supply) the LTM4625 supports an output voltage range of 0.6 V to 5.5 V, set by a single external resistor. Its high efficiency design delivers up to 5A continuous output current. Only bulk input and output capacitors are needed.
Complete 5A step-down Regulator - [Link]
by Susan Nordyk @ edn.com:
Leveraging Linear Technology’s Silent Switcher architecture and spread- spectrum frequency modulation, the LT8640 synchronous step-down switching regulator reduces EMI/EMC emissions by more than 25 dB—even with switching frequencies in excess of 2 MHz—enabling the part to easily pass automotive CISPR25, Class 5 peak limits. Synchronous rectification achieves efficiency as high as 95% with a switching frequency of 2 MHz, while the part’s 3.4-V to 42-V input range makes it useful for both automotive and industrial applications.
Step-down switching regulator minimizes EMI/EMC - [Link]
Linear Technology has squeezed a 3A voltage regulator into a package measuring just 6.25mm square and 1.8 mm high. The complete LTM4623 circuit only requires one input capacitor and one output capacitor, a resistor to set Vout and a small capacitor for Vout tracking and soft-start. At just 1.8mm height the regulator can be mounted on the PCB reverse side.
LTM4623 – Ultrathin 20VIN, 3A Step-Down DC/DC μModule Regulator - [Link]
by Haifeng Fan @ edn.com:
Isolated DC/DC converters are required in a broad range of applications including power metering, industrial programmable logic controllers (PLCs), insulated-gate bipolar transistor (IGBT) driver power supplies, industrial fieldbus, and industrial automation. These converters often are used to provide galvanic isolation, improve safety, and enhance noise immunity. Moreover, they can be used to generate multiple output voltage rails including dual-polarity rails.
Understanding isolated DC/DC converter voltage regulation - [Link]
by Steve Taranovich @ edn.com:
With many switching buck regulators on the market today that are capable of improving an automotive system design it is hard to choose the optimum one for your design. I patricularly like a new Linear Technology solution, the LT8609, a 2A, 42V input synchronous step-down switching regulator because it is unique in that it does not require an external flyback diode (sometimes called a snubber diode, freewheeling diode, suppressor diode, suppression diode, clamp diode or catch diode) which is a diode used to eliminate flyback, which is the sudden voltage spike seen across an inductive load when its supply voltage is suddenly reduced or removed. This makes for less external components.
Linear Technology 2A buck converter is 93% efficient at 2MHz - [Link]
Micrel’s family of low-profile step-down power modules integrates a synchronous buck regulator with an inductor into a 2.5×3×1.1-mm QFN package for the 1-A MIC33163/33164 and a 2.5×3×1.9-mm QFN package for the 2-A MIC33263/33264. The modules offer 100% duty cycle operation and accommodate an input voltage range of 2.7 V to 5.5 V.
DC/DC buck power modules fit tight spaces - [Link]
by Steve Taranovich @ edn.com:
A circuit or system designer’s job is a difficult one. Fraught with design compromises to be made and challenges to overcome that are sometimes seemingly insurmountable. That’s why our personalities are programmed to solve problems and “Think outside the box”. The best designers don’t even know there is a box!
I see so many new product offerings every day that “fill a hole in our line” or are simply another op amp or regulator for the portfolio among a sea of analog and power devices out there. I turn away the great majority of these so-called “new” products because my readers need innovative solutions with options that can meet their many and varied design needs. Time to market is the mantra in the industry.
Power management for wearables: Designer options - [Link]
by Steven Keeping @ digikey.com
Switching DC-to-DC voltage converters (“regulators”) comprise two elements: A controller and a power stage. The power stage incorporates the switching elements and converts the input voltage to the desired output. The controller supervises the switching operation to regulate the output voltage. The two are linked by a feedback loop that compares the actual output voltage with the desired output to derive the error voltage.
The controller is key to the stability and precision of the power supply, and virtually every design uses a pulse-width modulation (PWM) technique for regulation. There are two main methods of generating the PWM signal: Voltage-mode control and current-mode control. Voltage-mode control came first, but its disadvantages––such as slow response to load variations and loop gain that varied with input voltage––encouraged engineers to develop the alternative current-based method.
Today, engineers can select from a wide range of power modules using either control technique. These products incorporate technology to overcome the major deficiencies of the previous generation.
This article describes voltage- and current-mode control technique for PWM-signal generation in switching-voltage regulators and explains where each application is best suited.
Voltage- and Current-Mode Control for PWM Signal Generation in DC-to-DC Switching Regulators - [Link]
Adding to their ever growing family of power supply regulators Linear Technology have introduced the LTC3807 step-down switching regulator DC/DC controller driving an all N-channel external synchronous power MOSFET stage. The chip uses a constant frequency current mode architecture allowing a phase-lockable frequency of up to 750 kHz.
The chip draws just 50 μA no-load quiescent current and an OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3807 features a precision 0.8 V reference and power-good output indicator.
Low-loss Step-down Regulator - [Link]