vpapanik demonstrates the EM-1712 magnetic on-off switch on the breadboard:
Ultra-low standby current (less than 0.1 mA) magnetic on-off switch based on the AKM micropower hall bipolar latch EM-1712 and Microchip MCP1801 3.3V LDO. Of course, any regulator with EN (or SHDN) pin can be used. Ideal for touchless power switching, e.g. battery operated devices in watertight enclosures.
Micropower magnetic on-off switch - [Link]
The TPS7H1x01 is a low dropout (LDO) linear regulator that uses a PMOS pass element configuration. It operates under wide range of input voltage, from 1.5 V to 7V while offering excellent PSRR. The TPS7H1x01 features a precise and programmable fold back current limit implementation with a very wide adjustment range
- Current share/parallel operation to provide higher output current
- Wide VIN range: 1.5 V – 7 V
- Applications: Power management – LDO, RF components VCOs, receiver, ADCs amplifiers, high voltage, high PSRR, low noise and clean analog supply requirement applications
TPS7H1101 – 1.5 -7V Input, 3 Amp, Ultra Low Dropout Regulator - [Link]
By Ashok Bindra:
The use of low-dropout regulators, popularly known as LDOs, is common in many applications today because they provide a simple and inexpensive way to regulate an output voltage that is stepped-down from a higher input voltage. In addition, linear LDO voltage regulators contribute very-low noise as compared to switching regulators.
Nonetheless, to keep system power consumption low, such regulators must also feature ultra-low quiescent current (IQ) while providing excellent dynamic performance to ensure a stable, noise-free voltage rail, suitable for driving IC loads such as microprocessors, FPGAs, and other devices on the system board.
Selecting the Right Ultra-Low Quiescent-Current LDO Regulator - [Link]
International Rectifier’s IR3846 is a member of the Gen3 SupIRBuck family of highly integrated synchronous voltage regulators. IR3846 is a compact DC-DC regulator with a single input supply without the need of an external VCC with its internal LDO and has a high current output of up to 35 A. Being part of the Gen3 SupIRBuck family, it has a corrective and unique modulation feature that gives a jitter-free and noise-free operation allowing higher frequency and higher bandwidth operation for better transient response. The device is very efficient and ideal for power applications of enterprises requiring space such as netcom server/storage, distributed point-of-load power architecture, and embedded telecom systems that involve high power density.
With a market price of $29, IRDC3846 evaluation board is highly efficient and cost-effective having multiple features. The PCB is a 200 mm^2, 6-layer board mounted with few passive components. Some of the important features of the board include: digital soft-start up, power good operation, overvoltage protection, thermal shutdown, and programmable switching frequency, which is flexible for different applications ranging from 300 kHz-1.5 Mhz. It is designed to a well-regulated input supply of +12V and configured for remote differential sensing.
The IRDC3846 evaluation board is very easy-to-use. Simply connect a +12V input supply at VIN+ and VIN- and a maximum of 35 A load should be connected to VOUT+ and VOUT-. If external VCC is required in an operation, Vin and VCC pins should be shorted together by installing a 0 ohm resistor. Other than remote sensing, the board can also be configured for local sensing by changing the resistors needed for operation. The length of the on-board power ground is minimized for better efficiency. Using separate power ground and analog ground, both can be connected together using a 0 Ohm resistor.
If you need a low voltage, high current regulator, IR3846 definitely should be considered. Having a small footprint, the device has exceptional capability offering high density. It is likely suitable for many applications in network communication and storage systems.
International Rectifier SupIRBuckTM IRDC3846 Evaluation - [Link]
I grew fond of NXPs new LPC800 Cortex M0+ microcontrollers. I designed a small breakout for the LPC812 TSSOP20. This is the second revision. It includes push buttons for reset and activating the serial bootloader. The board has an integrated 500mA 3.3V LDO to supply both the MCU and connected devices from the USB port. The four pins on the top side (5V,RX,TX,GND) can be used to connect a cheap USB to serial adapter and program the device via the internal bootloader using FlashMagic.
LPC812 Breakout board - [Link]
Breakout board for micro SD cards:
This weeks PAW is just a breakout board for micro SD cards. There’s a number of boards like this on the market already, but they are kinda expensive and I like doing my own stuff, so here it is… The board have a LDO that supplies the SD card with 3.3 volts and there are proper level shifters on the board so it can connect to 5 volt devices. I’ve added a LED that will light up whenever a card is inserted and it will also double as a power indicator.
SD Card Breakout for breadboards - [Link]
This project details the design of a very low dropout adjustable power supply. A good power supply is essential to electronic projects, and being able to hook this up to a breadboard makes it very useful to hobbyists. It features a dropout of only 40mV – 400mV compared to 1.25V – 2.0V for a LM317 circuit. This means you can use a wider range of input/output voltages, including generating 3.3V from as low as 3.7V (such as 3 AA’s or a lithium ion battery)!
Low Dropout Adjustable Breadboard Power Supply - [Link]
The LT3081 is a rugged 1.5A wide input voltage range linear regulator with key usability, monitoring and protection features. The device has an extended safe operating area (SOA) compared to existing regulators, making it ideal for high input-to-output voltage and high output current applications where older regulators limit the output. The LT3081 uses a current source reference for single resistor output voltage settings and output adjustability down to zero volts. Output current limit can be set externally with a single resistor. This regulator architecture, combined with low millivolt regulation, enables multiple ICs to be paralleled easily for heat spreading and higher output current. The current from the device’s current monitor can be summed with the set current for line-drop compensation, where the output of the LT3081 increases with current to compensate for line drops.
LT3081 – 1.5A Single Resistor Rugged Linear Regulator with Monitors - [Link]
Steve Taranovich writes:
Touchstone, with its first analog power management product, has enhanced such a function with the capability to use supply voltages down to 0.6V while still being able to deliver a 75 mA output current.
The device can be used in power harvesting or peak load buffering applications, the LDO may post-regulate voltage buffered in a large capacitor or super-capacitor at boost’s output. Finally, the LDO may be operated simply as an on/off load switch.
TS3300 switching regulator coupled with an LDO in same package - [Link]
Ashok Bindra writes:
In their most basic form, charge pumps are circuits that generate a voltage larger than the supply voltage from which they operate. Traditionally, charge pumps have been perceived to have limited voltage capability, offering performance that is seen as filling a niche in the range between low-dropout LDOs and switching regulators. Nonetheless, there are benefits that make them attractive for certain applications. For instance, charge pumps deliver higher efficiency with good thermal management and have the flexibility to step up a voltage, step it down, or invert the input voltage. Since they use capacitors to store and transfer energy, charge pumps also are simple to design and do not require an inductor, which can be more costly, has higher output-noise levels, and frequently lowers output-current capability.
Charge Pumps Tackle Higher-Voltage Applications - [Link]