There are presently many switching regulator ICs. However, the STA801 and STA802 provide two switching regulators in a single package, each capable of supplying a maximum current of 0.5 A. Each device in the Allegro Microsystems STA800 series (www.allegromicro.com) contains a first step-down switcher with an output voltage of +5 V (STA801M) or +9 V[…]
Read moreCategory: Voltage Regulators Circuit Diagrams
Output Cutoff for Step-Up Switching Regulator Schematic Circuit Diagram
Nowadays, there is a whole series of switching regulator ICs that work according to the step-up principle and thus convert the input voltage to a higher output voltage. This takes place using coil L, which is periodically switched to ground via the LX connection of the IC. This causes a magnetic field to build up[…]
Read moreStep-Up/Step-Down Switching Regulator Schematic Circuit Diagram
If you wish to convert a range of possible input voltages into an output voltage that lies somewhere in the middle of that range, a regulator that can automatically switch between step-up and step-down modes is required. Such a device is the MAX1759 from Maxim (www.maxim-ic.com), which can take in an input voltage between +1.6 V[…]
Read moreVoltage Regulator Assistant Schematic Circuit Diagram
Everyone will be familiar with the problem of the voltage drop across wires, connectors or filtering components such as inductors, which force the voltage at the regulator output to be set higher than the circuit operating voltage. If the current drawn falls then the operating voltage rises above its nominal value; when the current rises,[…]
Read moreStep-up Switching Regulator with Integrated Current Limit Schematic Circuit Diagram
In the form of the LT1618, Linear Technology (www.lineartech.com) has made available a step-up switching regulator with a current limit mechanism. This makes it easy to protect an otherwise not short-circuit-proof switching regulator with a current limit mechanism. This makes it easy to protect an otherwise not short-circuit-proof switching regulator: the input voltage is always[…]
Read moreUSB Power Booster Schematic Circuit Diagram
Power shortage problems arise when too many USB devices connected to PC are working simultaneously. All USB devices, such as scanners, modems, thermal printers, mice, USB hubs, external storage devices and other digital devices obtain their power from PC. Since a PC can only supply limited power to USB devices, external power may have to[…]
Read moreDigital alarm clock using 4026 logic gates Schematic Circuit Diagram
Description and concept behind digital clock This digital alarm clock project use 4026 IC which is decade counter as well as seven segment driver . Seven segment display is used for displaying number from 0 to 9 and it will display number when the enable pin of 4026 is high on the rising edge of[…]
Read more±5-V Voltage Converter Schematic Circuit Diagram
Asymmetrical ±5 V power supply is often needed for small, battery-operated operational amplifier projects and analog circuits. An IC that can easily be used for this purpose is the National Semiconductor LM 2685. It contains a switched capacitor voltage doubler followed by a 5-V regulator. A voltage inverter integrated into the same IC, which also[…]
Read moreCompact Switching Step-Down Converter Schematic Circuit Diagram
Switch-mode power supplies are used in electronic circuits to increase (step up) or reduce (step-down) voltage levels in the most efficient manner possible. Compared to linear voltage regulators, switch-mode supplies convert relatively little energy into heat. Their efficiency is thus high. This is a major advantage with compact power supplies in particular since it sometimes[…]
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3-volts Car Adapter Schematic Circuit Diagram
This circuit is based on a standard LT1074CT switching regulator IC. For sure, Application Note AN35 published by Linear Technology describes the design far more elegantly than the author could in this short article. Interested readers are therefore strongly advised to get a copy of AN35. The schematic shows the LT1074CT used as a positive[…]
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