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Showing Results For: Switching Regulators

Switching Regulators

PMIC - Voltage Regulators – DC-DC Switching Regulators

A voltage regulator is an electrical device that maintains the voltage of a power source at a required voltage. The voltage regulators effectively keep the voltages in the recommended range of the electrical equipment receiving those voltages. Such devices are utilized in motor vehicles of all types to match the output voltage of the electrical generator and the electrical load and to the charging needs of the battery. These devices are also effectively used in electrical equipment where frequent voltage changes will be damaging. Therefore, it can regulate voltage during fluctuations and variations in load. It is useful for regulating both AC and DC voltage. They can take high input voltages and give out more stable or lower voltages. A secondary use for them is to protect the circuits during voltage spikes that can lead to severe damage.

Types of Voltage Regulators

Voltage regulators utilized in low-voltage electronic gadgets are typically integrated circuits. Power appropriation focuses on giving AC capacity to residential and industrial shoppers to utilize more refined and precisely enormous voltage regulators that keep up with appraised 110 V voltage paying little mind to utilization demands across the area.

In light of the physical plan, voltage controllers should be visible in coordinated circuits, electromechanical gadgets, or solid-state automated regulators. The most widely recognized characterizations of the active voltage regulators are linear and switching regulators.

Linear Regulators

Linear regulators are simple transistor-based devices that are usually packed as integrated circuits. They use differential amplifiers in their internal circuits to manage the output voltage against the reference voltage. Linear voltage regulators may give a fixed output or have a certain degree of adjustable control. They would require input current equal to the output current.

Switching Regulators

A switching regulator is a circuit that utilizes a power switch, a diode, and an inductor to change energy from input to output. They can toggle a device ON/OFF high frequency and change the duty cycle of the voltage transferred as output. The common topologies of these regulators are a buck, boost, and buck-boost. Buck converters are considered more effective during the voltage step down and can still increase the output current. The boost converters, on the other hand, can increase the output voltage to an amount more than the input voltage. 

The power switch used by these regulators is usually a Field Effect Transistor controlled by a switching controller IC that evaluates the output of the switching regulator in a feedback control loop. This ensures it maintains a constant voltage output when operating under normal conditions. Often in switching regulators, the FET is designed as a discrete component placed externally to the switching controller. In other designs, you will find the FET and controller in the same Integrated Circuit. 

Why Prefer Switching Regulators Over Linear Regulators?

Switching regulators provide three key advantages compared to linear regulators:

  • They offer much better switching efficiency.
  • Less energy loss occurs during the transfer, and smaller components and minimum thermal management are needed.
  • They can transform the energy stored by an inductor in a switching regulator into voltages greater than the input, are negative, or even through a transformer to offer electrical isolation per the input. 

Given such advantages, switching regulators are highly preferred over linear regulators. However, linear regulators also provide lower noise, higher bandwidth, and a simple design, making them the less expensive option.


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Switching Regulators, Step-Down DC-DC Regulator with Internal Switches, Maxim Integrated Switching Voltage Regulators, Maxim Integrated
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60V 300MA STEP-DOWN DC-DC CONVERTER Maxim Integrated presents the MAX15062 series of ultra-small, high-efficiency, synchronous step-down DC-DC converters are the industry’s smallest high-voltage synchronous buck regulator. A buck regulator is a DC-DC power converter which steps down voltage while stepping up current from its input to its output. This DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input voltage range. The MAX15062 series delivers an output current up to 300mA and comes in variants of 3.3V (MAX15062A), 5V (MAX15062B), and adjustable output voltages (MAX15062C). The device has the capability of operating at -40 °C to +125 °C and employs a peak-current-mode control architecture with a MODE pin that can be used to operate the device in pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. Features and Benefits • Internal Soft-Start, • Wide 4.5V to 60V Input Voltage Range, • Peak Efficiency = 92%, • High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range, • Delivers Up to 300mA Load Current, • Shutdown Current = 2.2μA (typ) Applications • 4–20mA Current Loops • General-Purpose Point-of-Load • High-Voltage LDO Replacement • HVAC and Building Control • Industrial Sensors • Process Control
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ICL7660CUA+, Maxim

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8-Pin, 1.11mm High μMAX Package Invert or Double the Input Supply Voltage Three Selectable Switching Frequencies High Frequency Reduces Capacitor Size 87% Efficiency at 50mA 200μA Quiescent Current (MAX860) 1μA Shutdown Supply Current 600mV Voltage Drop at 50mA Load 12Ω Output Resistance Applications Handheld Instruments (PDAs, Palmtops) Interface Power Supplies Medical Instruments Operational Amplifier Power Supplies Portable Computing
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Step-Down (Buck) Regulators, Internal Power Switch, Linear Technology Linear Technology offers a selection of step down (buck) switching regulators with both synchronous and non-synchronous internal switches. They are capable of offering 2.25V up to 30V input voltages and a variety of switching frequencies. Distributed power systems, battery powered instruments and point of load power supply are amongst several applications they may be used. Switching Voltage Regulators, Linear Technology Linear Technology product series of synchronous and non-synchronous internal switching regulator ICs offer high efficiency plus a wide input voltage range and switching frequencies up to 4MHz. The controllers span over several types of configurations from buck (step-down), boost (step-up), buck-boost, forward, Isolated, Inverting and flyback controllers. The Flyback, Forward and Isolated Controllers primary and secondary side provide a solution to help replace the DC/DC bricks that get used in back-plane power conversion.
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OKI-78SR-3.3/1.5-W36-C, Murata Power Solutions

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Murata 1.5A Single Output Non-Isolated DC-DC Converter - OKI Series The Murata PS OKI-78SR Series is built on a 10.4 by 16.5 mm, single inline package SIP module, these DC/DC converters are non-isolated switching regulator for embedded applications. Two nominal output voltages are offered, each with 1.5 Amp maximum output. Based on fixed-frequency buck switching topology, the high efficiency means very low heat and little electrical noise, requiring no external components. The ultra-wide input range is 7 to 36 Volts DC. Protection features include short circuit current limit protection. The OKI-78SR switching regulator is designed to meet all standards approvals. RoHS-6 (no lead) hazardous material compliance is specified as standard. Features & Benefits Ultra wide 7 to 36 VDC input range Fixed Outputs of 3.3 or 5 VDC up to 1.5 Amps Vertical or horizontal SIP-mount, small footprint package “No heat sink” direct replacement for 3-terminal 78xx-series linear regulators High efficiency with no external components Short circuit protection Outstanding thermal derating performance Approvals UL/EN/IEC 60950-1, 2nd Edition Fabricated on a 0.41 x 0.65 inch (10.4 x 16.5 mm) Single Inline Package (SIP) module, the OKI-78SR series are non-isolated switching regulatorSR) DC-DC power converters for embedded applications. The fixed single output converters offerboth tight regulation and high efficiency directly at the power usage site and are a direct plug-ineplacement for TO-220 package 78xx series linear regulators. Typically, no extra outside components are required. 7-36Vin (3.3 & 5Vout), 15-36Vin (12Vout) Fixed Output: 3.3 or 5V @ 1.5A or 12V @ 1.0A Vertical SIP or horizontal mount, small footprint package No heat sink” direct replacement for 3-terminal 78xx-series linear regulators H...
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