The LT3690 is an adjustable frequency monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 90mΩ switch is included on the device along with the boost diode and the necessary oscillator, control, and logic circuitry. The internal synchronous power switch of 30mΩ increases efficiency and eliminates the need for an external Schottky catch diode. Current mode topology is used for fast transient response and good loop stability. Shutdown reduces input supply current to less than 1μA. The low ripple Burst Mode maintains high efficiency at low output currents while keeping output ripple below 15mV in typical applications.
LT3690 – 36V, 4A, 1.5MHz Synchronous Step-Down Switching Regulator with 70μA Quiescent Current- [Link]
International Rectifier introduced the IR3823 SupIRBuck integrated voltage regulator designed for space-constrained, energy efficient netcom, server and storage applications. Steve Taranovich writes:
The IC delivers up to 3A a 3.5×3.5mm package. Efficiencies in excess of 97.5% are obtainable for designs converting power from a 6V input to a 4.8V output. The extremely high initial efficiency allows switching at up to 1.5MHz from a 12V supply to enable a complete 3A power supply solution in less than 130mm2. Featuring constant frequency and virtually jitter-free operation with synchronization capability, the new device is well suited to noise-sensitive applications, while the higher bandwidth reduces component count to shrink PCB footprint. A tri-level selectable soft-start feature is also offered for ease of sequencing.
IR’s integrated voltage regulator with 97.5% efficiency in a 3.5×3.5mm package - [Link]
By Ashok Bindra:
A buck-boost DC/DC converter delivers a regulated output voltage even when the input voltage is below or above that required by the load. Buck-boost converters adequately serve the needs of battery-powered consumer devices where the required input range is rather narrow; in many cases from 1.8 to 5.5 VDC. However, the situation is different when it comes to industrial and automotive applications where input voltages can vary over a very wide range.
For example, the automotive battery presents one of the most challenging inputs to a power supply. While its nominal voltage can vary from 10.6 to 15 V, depending on the battery’s state of charge, the ambient temperature, and the alternator, cold-crank conditions can push the rail below 4 V and line transients can produce 40 V spikes. That means it can vary from less than 4 V to over 40 V. In addition, experts say that the automotive power rail is also subject to a variety of dynamic disturbances produced by changes in the engine, transitioning loads, and inductive transients in the wiring harness.
Buck-Boost DC/DC Handles Wide Input-Voltage Range - [Link]
Linear Technology announced the LTC3330, a complete regulating energy harvesting solution that delivers up to 50mA of continuous output current to extend battery life when harvestable energy is available. The IC requires no supply current from the battery (Iq=0) when providing regulated power to the load from harvested energy and only 750 nA operating when powered from the battery under no-load conditions.
What are the key needs of an Energy Harvesting (EH) power supply? Well, first of all, battery redundancy power needs to be available at times when the ambient power is not available. Of course, we want to extend battery life by harvesting ambient energy from thermal, vibration, solar, etc. To make the front end of our power supply more versatile, it would be useful to be able to convert both AC (piezo, magnetic, etc.) or DC (solar) energy transducers with a fairly wide voltage range and also to have an input prioritizer that could decide whether to use the energy harvesting input or the battery input.
LTC3330 - LTC nano-power buck-boost DC/DC - [Link]
Giorgos Lazaridis writes:
Some time ago I presented a small circuit with the MCP1640, the High Efficiency Battery Boost Regulator using the MCP1640. My original intention was to combine it with this one and make a complete power supply unit with SMPS technology, dual voltage output, battery charger and power failure signal output. And here it is!
SMPS with Battery Backup and NiMH Charger using the LM2595 - [Link]
Design a small, efficient 4A step-down converter in just minutes! New in EE-Sim, Maxim’s online design and simulation tool, are the MAX15050 and MAX15051. These 2mm x 2mm DC-DC regulators have integrated MOSFETs and other features that simplify and shrink your design. Use EE-Sim to evaluate the MAX15050 or MAX15051 for your next point-of-load power-supply project!
MAX15050 – Design a small, efficient 4A step-down converter - [Link]
If you need an isolated power supply for some part of your device, Traco TMH series DC/DC converters will create this second voltage to you.
Imagine, that in the whole device we only have 5 Volts but for one integrated we need a higher voltage. Or we even have a suitable voltage, but for a protection of input voltages, suppression of disturbances etc. we need an isolated power supply for a given part of our device …
For such cases we keep in our standard stock offer many isolating DC/DC converters from company Traco Electronic, but we´d like to introduce to you miniature “retiring” 2W DC/DC converters of the TMH series with an excellent price/ performance ratio. It can be said, that the TMH series represents a golden middle way as for specification, efficiency, dimensions and price. Reliable regulation within 10% at 20-100% load, miniature SIP package and a wide temperature range of -40 to +85°C suit to the most of applications. Available are versions with a single (S) but also dual (D) output voltage.
TMH series is very useful in places, where it is necessary to use isolated power supply, but in regards to its affordable price and miniature dimensions is the TMH series suitable even in places, where an isolated power supply is not inevitably necessary but it can help to increase immunity to disturbances, ground loops and other unexpected influences, which can occur. A big advantage of the TMH series is the 100% 8h burn-in. A novelty in our stock is the type TMH0515S 5VDC/15VDC. Detailed information can be found in the TMH datasheet.
In case of interest, please contact us at firstname.lastname@example.org.
TMH 0515 – when one voltage is equal to two – [Link]
Brian from teho Labs has been working on creating a power supply – the quietPower:
quietPower is a power supply under development at teho Labs to provide a low noise bipolar output. This is essential for creating high quality measurement systems.quietPower is still under development, when it is finished full schematic and a parts list will be made available.
quietPower, a low noise switch mode power supply - [Link]
The LT3651 enables fast charging of Li-Ion/Polymer batteries by delivering up to 4A of continuous charge current with minimal power loss. This is due to its high efficiency switchmode topology, including on-chip synchronous MOSFETs. Its autonomous operation means no microcontroller is necessary and the device integrates an onboard C/10 or timer charge termination. The LT3651’s programmable input current limit with PowerPathTM control regulates charge current to maintain a constant supply current, preventing the input supply from collapsing.
- Wide Input Voltage Range: Up to 32V (40V Absolute Maximum)
- Programmable Charge Current Up to 4A
- Selectable C/10 or Onboard Timer Termination
- Dynamic Charge Rate Programming/Soft-Start
- Programmable Input Current Limit
LT3651 – Monolithic 4A High Voltage 1 Cell Li-Ion Battery Charger - [Link]
The LTM4641 is a 4.5V to 38V input, 0.6V to 6V output, 10A step-down μModule regulator with comprehensive input and load protection features. The part monitors input voltage, output voltage and temperature conditions. If any user-adjustable trip thresholds are exceeded, the LTM4641 responds quickly (within 500ns in the case of an output overvoltage fault), ceasing operation and if necessary activating external switches to protect both input source and load. As a μModule regulator, the LTM4641 includes power MOSFETs, DC/DC controller, inductor, compensation and the protection logic circuits in a compact surface mount BGA package.
- Wide Operating Input Voltage Range: 4.5V to 38V
- 10A DC Typical, 12A Peak Output Current
- Output Range: 0.6V to 6V
- ±1.5% Maximum Total Output DC Voltage Error
- Differential Remote Sense Amplifier for POL Regulation
- Internal Temperature, Analog Indicator Output
LTM4641 – 38V, 10A DC/DC µModule Regulator with Advanced Input and Load Protection - [Link]