{"product_id":"2119-pololu-step-up-step-down-voltage-regulator-s7v7f5","title":"2119 - Pololu Step-Up\/Step-Down Voltage Regulator S7V7F5","description":"\u003cp class=\"p1\"\u003eThe S7V7F5 switching step-up\/step-down regulator efficiently produces 5 V from input voltages between 2.7 and 11.8 V. Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below 5 V. The very compact (0.35″ × 0.475″) module can supply up to 1 A when stepping down and about 500 mA when stepping up.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe Pololu step-up\/step-down voltage regulator S7V7F5 is a switching regulator (also called a switched-mode power supply (SMPS) or DC-to-DC converter) that uses a buck-boost topology. It takes an input voltage from 2.7 V to 11.8 V and increases or decreases the voltage to a fixed 5 V output with a typical efficiency of 90%.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThis flexibility in input voltage is especially well-suited for battery-powered applications in which the battery voltage begins above 5 V and drops below as the battery discharges. Without the typical restriction on the battery voltage staying above the required voltage throughout its life, new battery packs and form factors can be considered. For instance, a 4-cell battery holder, which might have a 6 V output with fresh alkalines but a 4.8 V nominal voltage with NiMH cells and a 4.0 V output with partially discharged cells, can now be used for a 5 V circuit. In another typical scenario, a disposable 9 V battery powering a 5 V circuit can be discharged to under 3 V instead of cutting out at 6 V, as with typical linear or step-down regulators.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eIn typical applications, this regulator can deliver about 1 A continuous when the input voltage is higher than 5 V (stepping down) and 500 mA continuous when the input is lower than 5 V (stepping up). The regulator has over-voltage, under-voltage, and short circuit protection, and thermal shutdown prevents damage from overheating; the board does \u003cstrong\u003enot\u003c\/strong\u003e have reverse-voltage protection.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li3\"\u003einput voltage: 2.7 to 11.8 V\u003c\/li\u003e\n\u003cli class=\"li3\"\u003efixed  5V output with +5\/-2% accuracy\u003c\/li\u003e\n\u003cli class=\"li3\"\u003etypical continuous output current: 1 A when stepping down; 500 mA when stepping up (Actual continuous output current depends on input voltage. See Typical Efficiency and Output Current section below for details)\u003c\/li\u003e\n\u003cli class=\"li3\"\u003epower-saving feature maintains high efficiency at low currents\u003c\/li\u003e\n\u003cli class=\"li3\"\u003eintegrated over-temperature protection\u003c\/li\u003e\n\u003cli class=\"li3\"\u003esmall size: 0.35″ × 0.475″ × 0.1″ (9 × 12 × 3 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eUsing the Regulator\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cspan style=\"color: #ff0000;\"\u003eDuring normal operation, this product can get hot enough to burn you. Take care when handling this product or other components connected to it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eConnections\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe step-up\/step-down regulator has just three connections: the input voltage (VIN), ground (GND), and the output voltage (VOUT). These three connections are labeled on the back side of the PCB, and they are arranged with a 0.1″ spacing along the edge of the board for compatibility with standard \u003cspan class=\"s1\"\u003esolderless breadboards\u003c\/span\u003e and perfboards and \u003cspan class=\"s1\"\u003econnectors\u003c\/span\u003e that use a 0.1″ grid. You can solder wires directly to the board or solder in either the 3×1 \u003cspan class=\"s1\"\u003estraight male header strip\u003c\/span\u003e or the 3×1 \u003cspan class=\"s1\"\u003eright-angle male header strip\u003c\/span\u003e that is included.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe input voltage, VIN, should be between 2.7 and 11.8 V. Lower inputs can shut down the voltage regulator; \u003cspan class=\"s2\"\u003ehigher inputs can destroy the regulator\u003c\/span\u003e, so you should ensure that noise on your input is not excessive, and you should be wary of destructive LC spikes (see below for more information).\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe output voltage, VOUT, is regulated to a fixed 5 V, but it can be as high as 5.2 V when there is little or no load on the regulator.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eTypical Efficiency and Output Current\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe efficiency of a voltage regulator, defined as (Power out)\/(Power in), is an important measure of its performance, especially when battery life or heat are concerns. As shown in the graph below, this switching regulator typically has an efficiency of 85% to 95%. A power-saving feature maintains these high efficiencies even when the regulator current is very low.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe maximum achievable output current of the board varies with the input voltage but also depends on other factors, including the ambient temperature, air flow, and heat sinking. The graph below shows output currents at which this voltage regulator’s over-temperature protection typically kicks in. These currents represent the limit of the regulator’s capability and cannot be sustained for long periods, so the continuous currents that the regulator can provide are typically several hundred milliamps lower, and we recommend trying to draw no more than about 1 A from this regulator throughout its input voltage range.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cstrong\u003eLC Voltage Spikes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eWhen connecting voltage to electronic circuits, the initial rush of current can cause voltage spikes that are much higher than the input voltage. If these spikes exceed the regulator’s maximum voltage, the regulator can be destroyed. If you are connecting more than about 9 V, using power leads more than a few inches long, or using a power supply with high inductance, we recommend soldering a 33 μF or larger electrolytic capacitor close to the regulator between VIN and GND. The capacitor should be rated for at least 16 V.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eMore information about LC spikes can be found in our application note, \u003ca href=\"http:\/\/www.pololu.com\/docs\/0J16\" target=\"_blank\"\u003e\u003cspan class=\"s1\"\u003eUnderstanding Destructive LC Voltage Spikes\u003c\/span\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e","brand":"Pololu","offers":[{"title":"Default Title","offer_id":48098066006361,"sku":"582119","price":4.47,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/1009\/7753\/files\/0j4096.600_c22cf7d8-8f41-4ed6-9bb9-e1786ee7fee8.jpg?v=1712341710","url":"https:\/\/robot-italy.com\/products\/2119-pololu-step-up-step-down-voltage-regulator-s7v7f5","provider":"Robot Italy","version":"1.0","type":"link"}