{"product_id":"4965-5v-step-up-step-down-voltage-regulator-s8v9f5","title":"5V Step-Up\/Step-Down Voltage Regulator S8V9F5","description":"\u003cp\u003eThis synchronous switching step-up\/step-down regulator efficiently produces \u003cstrong\u003e5 V\u003c\/strong\u003e from input voltages between 1.4 V and 16 V.  (\u003cstrong\u003eNote:\u003c\/strong\u003e minimum startup voltage is 2.7 V, but it operates down to 1.4 V after that.)  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 available output current depends on the input voltage (typically between 1 A and 1.5 A continuous for input voltages close to the output).  The regulator also features an optional enable input that can be used to put the regulator in a low-power state with a current draw of less than 15 µA per volt on VIN.  The board measures 0.4″ × 0.65″ and has a typical efficiency of 80% to 90%.\u003c\/p\u003e\n\u003cbr\u003e\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003ctable class=\"picture_with_caption right\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J12217.1200.jpg?c2ff590215f6f3f03c35816bc998f34e\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id voltage regulator s8v9fx bottom view with dimensions. data-picture-id=\"0J12217\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12217.300.jpg?c2ff590215f6f3f03c35816bc998f34e\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003cp\u003eThe S8V9Fx family of efficient switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) convert both higher and lower input voltages to a regulated output voltage. They take input voltages from 1.4 V to 16 V and increase or decrease them as necessary, offering typical efficiencies of 80% to 90% and typical continuous output currents over 1 A for input voltages close to the output voltage.  (\u003cstrong\u003eNote:\u003c\/strong\u003e The minimum start-up voltage is 2.7 V; see the \u003ca href=\"#connections\"\u003econnections section\u003c\/a\u003e for details.)\u003c\/p\u003e\n\u003cp\u003eThe flexibility in input voltage offered by this family of regulators is especially well-suited for battery-powered applications in which the battery voltage begins above the regulated voltage 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.\u003c\/p\u003e\n\u003cp\u003eThe S8V9Fx regulators have under-voltage lockout and over-current protection. A thermal shutdown feature also helps prevent damage from overheating and a soft-start feature limits the inrush current and gradually ramps the output voltage on startup.\u003c\/p\u003e\n\u003cp\u003eThis family consists of five regulators with output voltages ranging from 3.3 V to 9 V:\u003c\/p\u003e\n\u003cul\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/4964\"\u003eS8V9F3: 3.3V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/4965\"\u003eS8V9F5: 5V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/4966\"\u003eS8V9F6: 6V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/4967\"\u003eS8V9F7: 7.5V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/4968\"\u003eS8V9F9: 9V output\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe different versions of the S8V9Fx regulators all look very similar, so the bottom silkscreen includes a blank space where you can add your own distinguishing marks or labels.\u003c\/p\u003e\n\u003cp class=\"note\"\u003eWe manufacture these boards in-house at our Las Vegas facility, which gives us the flexibility to make these regulators with custom fixed output voltages.  If you are interested in customization, please \u003ca href=\"\/contact\"\u003econtact us\u003c\/a\u003e.\u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center wide\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J12218.1200.jpg?0d3a62d6be7d51b73901c1337f75c446\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"wide zoomable\" data-gallery-pictures=\"[{\" id voltage regulator s8v9fx side view. data-picture-id=\"0J12218\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12218.600.jpg?0d3a62d6be7d51b73901c1337f75c446\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch2\u003e\nDetails for item #4965\n\u003c\/h2\u003e\n\u003ctable class=\"picture_with_caption right\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"max-width: 220px\"\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J12216.1200.jpg?ca098321dd3e193341a26d18d6fabc79\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id voltage regulator s8v9fx top view. data-picture-id=\"0J12216\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12216.220.jpg?ca098321dd3e193341a26d18d6fabc79\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003cth style=\"max-width: 220px\"\u003e\u003cp\u003eStep-Up\/Step-Down Voltage Regulator S8V9Fx, top view.\u003c\/p\u003e\u003c\/th\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\t\u003cli\u003eInput voltage: 1.4 V to 16 V (Note: minimum start-up voltage is 2.7 V)\u003c\/li\u003e\n\t\u003cli\u003eOutput voltage: 5 V with 4% accuracy\u003c\/li\u003e\n\t\u003cli\u003eTypical maximum continuous output current: 1 A to 1.5 A when input voltage is close to the output voltage (see the \u003ca href=\"#maxcurrent\"\u003emaximum continuous output current graph\u003c\/a\u003e below for current capabilities across the full input voltage range)\u003c\/li\u003e\n\t\u003cli\u003eTypical efficiency of 80% to 90%, depending on input voltage and load (see the \u003ca href=\"#efficiency\"\u003eefficiency graph\u003c\/a\u003e below)\u003c\/li\u003e\n\t\u003cli\u003eUnder 4 mA typical no-load quiescent current (see the \u003ca href=\"#quiescent\"\u003equiescent current graph\u003c\/a\u003e below); can be reduced to 10 µA to 15 µA per volt on VIN by disabling the board\u003c\/li\u003e\n\t\u003cli\u003eSoft-start feature limits inrush current and gradually ramps output voltage\u003c\/li\u003e\n\t\u003cli\u003eOver-current protection and over-temperature shutoff\u003c\/li\u003e\n\t\u003cli\u003eInput under-voltage lockout\u003c\/li\u003e\n\t\u003cli\u003ePower-saving feature maintains high efficiency at low currents\u003c\/li\u003e\n\t\u003cli\u003eCompact size: 0.4″ × 0.65″ × 0.1″ (10.2 mm × 16.5 mm × 2.6 mm); see the \u003ca href=\"\/file\/0J1987\/step-up-step-down-voltage-regulator-s8v9fx-dimensions.pdf\"\u003edimension diagram\u003c\/a\u003e (719k pdf) for more information\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eUsing the Regulator\u003c\/h2\u003e\n\u003ch3 id=\"connections\"\u003eConnections\u003c\/h3\u003e\n\u003cp\u003eThe step-up\/step-down regulator has four main connections: the output voltage (VOUT), ground (GND), the input voltage (VIN), and an enable input (EN).\u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J12228.1200.jpg?770200ff1032bc20c1a42eedb6401121\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id voltage regulator s8v9fx pinout. data-picture-id=\"0J12228\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12228.500.jpg?770200ff1032bc20c1a42eedb6401121\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eVOUT\u003c\/strong\u003e is the regulated output voltage. The regulator’s soft-start feature gradually ramps up the VOUT voltage on start-up to limit in-rush current draw.\u003c\/p\u003e\n\u003cp\u003eThe input voltage, \u003cstrong\u003eVIN\u003c\/strong\u003e, should be between 2.7 V and 16 V when the regulator is first powered.  After the regulator is running, it can continue operating down to 1.4 V.  Lower inputs can shut down the voltage regulator; \u003cins\u003ehigher inputs can destroy the regulator\u003c\/ins\u003e, so you should ensure that noise on your input is not excessive, and you should be wary of destructive LC spikes (see the \u003ca href=\"#lcspike\"\u003eLC voltage spike\u003c\/a\u003e section below for more information).\u003c\/p\u003e\n\u003cp\u003eThe regulator, which is enabled by default, can be put into a low-power sleep state by bringing the \u003cstrong\u003eEN\u003c\/strong\u003e pin low (under 1 V).  Leaving the pin disconnected or bringing the pin above 1.3 V will enable the regulator. The quiescent current draw in sleep mode is dominated by the current in the 100 kΩ pull-up resistor from ENABLE to VIN, which altogether will be between 10 µA and 15 µA per volt on VIN.\u003c\/p\u003e\n\u003ch3\u003eIncluded hardware\u003c\/h3\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J12219.1200.jpg?1801fb83f1c6ef221870fb725373cdcc\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id voltage regulator s8v9fx with hardware. data-picture-id=\"0J12219\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12219.350.jpg?1801fb83f1c6ef221870fb725373cdcc\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003cp\u003eThe through-holes are arranged with a 0.1″ spacing along the edge of the board for compatibility with standard \u003ca href=\"https:\/\/www.pololu.com\/category\/28\/solderless-breadboards\"\u003esolderless breadboards\u003c\/a\u003e and perfboards and \u003ca href=\"https:\/\/www.pololu.com\/category\/19\/connectors\"\u003econnectors\u003c\/a\u003e that use a 0.1″ grid.  You can solder wires directly to the board or solder in the included breakaway 4×1 \u003ca href=\"https:\/\/www.pololu.com\/product\/965\"\u003estraight male header strip\u003c\/a\u003e or the 4×1 \u003ca href=\"https:\/\/www.pololu.com\/product\/967\"\u003eright-angle male header strip\u003c\/a\u003e as desired.\u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003cimg alt=\"\" class=\"\" data-gallery-pictures=\"[{\" id voltage regulator s8v9fx units on a breadboard. data-picture-id=\"0J12220\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12220.400.jpg?88613261601abf9f7fe90d9fc6a2d420\"\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch3 id=\"efficiency\"\u003eTypical efficiency\u003c\/h3\u003e\n\u003cp\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.\u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center wide\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003cimg alt=\"\" class=\"wide\" data-gallery-pictures=\"[{\" id efficiency of step-up voltage regulator s8v9f5. data-picture-id=\"0J12190\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12190.600.png?9f48f1158cba2d06d7241a42fde3a09d\"\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch3 id=\"maxcurrent\"\u003eMaximum continuous output current\u003c\/h3\u003e\n\u003cp\u003eThe maximum achievable output current of the regulator varies with the input voltage but also depends on other factors, including the ambient temperature, air flow, and heat sinking. The graph below shows maximum output currents that the regulators in the S8V9Fx family can deliver continuously at room temperature in still air and without additional heat sinking.\u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center wide\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003cimg alt=\"\" class=\"wide\" data-gallery-pictures=\"[{\" id maximum continuous output current of step-up voltage regulator s8v9fx. data-picture-id=\"0J12194\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12194.600.png?90683e6da0b741573de2e04cbc22596a\"\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003cp class=\"note_warning clear\"\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\/p\u003e\n\u003ch3 id=\"quiescent\"\u003eQuiescent current\u003c\/h3\u003e\n\u003cp\u003eThe quiescent current is the current the regulator uses just to power itself, and the graph below shows this as a function of the input voltage.  The module’s EN input can be driven low to put the board into a low-power state where it typically draws between 10 µA and 15 µA per volt on VIN.\u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center wide\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003cimg alt=\"\" class=\"wide\" data-gallery-pictures=\"[{\" id quiescent current of step-up voltage regulator s8v9fx. data-picture-id=\"0J12195\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J12195.600.png?5b94b9e2deb1dff1bddfb09c22ba63a4\"\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch3 id=\"lcspike\"\u003eLC Voltage Spikes\u003c\/h3\u003e\n\u003cp\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 a 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 20 V.\u003c\/p\u003e\n\u003cp\u003eMore information about LC spikes can be found in our application note, \u003ca href=\"https:\/\/www.pololu.com\/docs\/0J16\"\u003eUnderstanding Destructive LC Voltage Spikes\u003c\/a\u003e.\u003c\/p\u003e","brand":"Pololu","offers":[{"title":"2-4 Settimane","offer_id":47696728719705,"sku":"POL-4965","price":10.97,"currency_code":"EUR","in_stock":true},{"title":"1 Giorno","offer_id":47886007107929,"sku":"POL-4965\/A","price":10.97,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/1009\/7753\/files\/0J12214.1200.jpg?v=1705456879","url":"https:\/\/robot-italy.com\/products\/4965-5v-step-up-step-down-voltage-regulator-s8v9f5","provider":"Robot Italy","version":"1.0","type":"link"}