{"product_id":"2562-pololu-5v-step-up-voltage-regulator-u1v11f5","title":"Pololu 5V Step-Up Voltage Regulator U1V11F5","description":"\u003cp\u003eThis compact (0.45″×0.6″) U1V11F5 switching step-up (or boost) voltage regulator efficiently generates \u003cstrong\u003e5 V\u003c\/strong\u003e from input voltages as low as 0.5 V. Unlike most boost regulators, the U1V11F5 offers a true shutdown option that turns off power to the load, and it automatically switches to a linear down-regulation mode when the input voltage exceeds the output. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.\u003c\/p\u003e\n\n\u003cbr\u003e\u003ctable class=\"picture_with_caption right\"\u003e\u003ctr\u003e\n\n\u003ctd\u003e \u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J4608.1200.jpg?e85a4c086e77225f6f97c60778f79d20\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-up voltage regulator u1v11f3 bottom view with dimensions. data-picture-id=\"0J4608\" data-picture-longest_side=\"443\" src=\"https:\/\/a.pololu-files.com\/picture\/0J4608.250.jpg?e85a4c086e77225f6f97c60778f79d20\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\n\u003c\/tr\u003e\u003c\/table\u003e\n\n\u003ch2\u003e Overview\u003c\/h2\u003e\n\n \u003cp\u003eThis 5 V boost (step-up) voltage regulator generates higher output voltages from input voltages as low as 0.5 V, and it also automatically switches to a linear down-regulation mode when the input voltage exceeds the output. This makes it great for powering 5 V electronics projects from 1 to 3 NiMH, NiCd, or alkaline cells or from a single lithium-ion cell. Additionally, unlike most boost regulators, this unit offers a true shutdown option that turns off power to the load (with typical boost regulators, the input voltage will pass directly through to the output when they are disabled).\u003c\/p\u003e\n\n \u003cp\u003eWhen boosting, this module acts as a switching regulator (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and has a typical efficiency between 70% to 90%. The available output current is a function of the input voltage, output voltage, and efficiency (see \u003cem\u003eTypical Efficiency and Output Current\u003c\/em\u003e section below), but the input current can typically be as high as 1.2 A. This regulator is also available with a \u003ca href=\"https:\/\/www.pololu.com\/product\/2561\"\u003efixed 3.3 V\u003c\/a\u003e or \u003ca href=\"https:\/\/www.pololu.com\/product\/2560\"\u003eadjustable\u003c\/a\u003e output, and very similar regulators are available in a much smaller size with a \u003ca href=\"https:\/\/www.pololu.com\/product\/2563\"\u003efixed 3.3 V\u003c\/a\u003e or \u003ca href=\"https:\/\/www.pololu.com\/product\/2564\"\u003efixed 5 V\u003c\/a\u003e output.\u003c\/p\u003e\n\n\u003cp\u003e The regulator's thermal shutdown engages at around 140°C and helps prevent damage from overheating, but it does \u003cstrong\u003enot\u003c\/strong\u003e have reverse-voltage protection.\u003c\/p\u003e\n\n\u003ctable class=\"picture_with_caption right\"\u003e\u003ctr\u003e\n\n \u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J4609.1200.jpg?afee1cf27e8222b57a968fa8f786786d\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-up voltage regulator u1v11f3 in a breadboard. data-picture-id=\"0J4609\" data-picture-longest_side=\"800\" src=\"https:\/\/a.pololu-files.com\/picture\/0J4609.250.jpg?afee1cf27e8222b57a968fa8f786786d\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\n\u003c\/tr\u003e\u003c\/table\u003e\n\n\u003ch2\u003e Features\u003c\/h2\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e Input voltage: 0.5 V to 5.5 V\u003c\/li\u003e\n\n\u003cli\u003e Fixed 5V output with 4% accuracy\u003c\/li\u003e\n\n\u003cli\u003e True shutdown option that turns off power to the load\u003c\/li\u003e\n\n\u003cli\u003e Automatic linear down-regulation when the input voltage is greater than the output voltage\u003c\/li\u003e\n\n\u003cli\u003e 1.2 A switch allows for input currents up to 1.2 A\u003c\/li\u003e\n\n\u003cli\u003e Good efficiency at light load: \u0026lt;1 mA typical no-load quiescent current, though it can exceed 1 mA for very low input voltages (\u0026lt;100 μA typical quiescent current with \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e = LOW)\u003c\/li\u003e\n\n\u003cli\u003e Integrated over-temperature shutoff\u003c\/li\u003e\n\n\u003cli\u003e Small size: 0.45″ × 0.6″; × 0.1″ (12 × 15 × 3 mm)\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2\u003e Using the Regulator\u003c\/h2\u003e\n\n\u003ch3\u003e Connections\u003c\/h3\u003e\n\n\u003cp\u003e The boost regulator has four connections: shutdown ( \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e ), input voltage (VIN), ground (GND), and output voltage (VOUT).\u003c\/p\u003e\n\n \u003cp\u003eThe \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e can be driven low (typically under 0.4 V) to power down the regulator and turn off power to the load (unlike most boost regulators, the input power does not pass through to the output when the board is disabled). This pin is internally pulled up to VIN through an 100 kΩ resistor, so it can be left disconnected or connected directly to VIN if you do not need to use the disable feature. The disable threshold is a function of the input voltage as follows:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e For VIN \u0026lt; 0.8 V, \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e voltage must be below 0.1×VIN to disable the regulator and above 0.9×VIN to enable it.\u003c\/li\u003e\n\n\u003cli\u003e For 0.8 V ≤ VIN ≤ 1.5 V, \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e voltage must be below 0.2×VIN to disable the regulator and above 0.8×VIN to enable it.\u003c\/li\u003e\n\n\u003cli\u003e For VIN \u0026gt; 1.5 V, \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e voltage must be below 0.4 V to disable the regulator and above 1.2 V to enable it.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003cp\u003eThe input voltage, VIN, must be at least 0.5 V for the regulator to turn on. However, once the regulator is on, the input voltage can drop as low as 0.3 V and the 5 V output voltage will be maintained on VOUT. Unlike standard boost regulators, this regulator has an additional linear down-regulation mode that allows it to convert input voltages as high as 5.5 V down to 5 V for small to moderate sized loads (for example, in our tests, the \u003ca href=\"https:\/\/www.pololu.com\/product\/2560\"\u003eadjustable version\u003c\/a\u003e of this regulator was able to supply 300 mA while converting an input of 5.5 V down to 1.8 V). When the input voltage exceeds 5 V, the regulator automatically switches to this down-regulation mode. The input voltage should not exceed 5.5 V. Please be wary of destructive LC spikes that might cause the input voltage to exceed 5.5 V (see below for more information).\u003c\/p\u003e\n\n \u003cp\u003eThe four 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 solderless \u003ca href=\"https:\/\/www.pololu.com\/category\/28\/solderless-breadboards\"\u003ebreadboards\u003c\/a\u003e , \u003ca href=\"https:\/\/www.pololu.com\/category\/19\/connectors\"\u003econnectors\u003c\/a\u003e , and other prototyping arrangements that use a 0.1″ grid. You can solder wires directly to the board or solder in either the 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 that is included.\u003c\/p\u003e\n\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\n\u003ctd\u003e \u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J4610.1200.jpg?d2954197382597f80f8aa61a63e59061\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-up voltage regulator u1v11f3 with included hardware. data-picture-id=\"0J4610\" data-picture-longest_side=\"800\" src=\"https:\/\/a.pololu-files.com\/picture\/0J4610.300.jpg?d2954197382597f80f8aa61a63e59061\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\n\u003c\/tr\u003e\u003c\/table\u003e\n\n\u003ch3\u003e Typical Efficiency and Output Current\u003c\/h3\u003e\n\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. As shown in the graphs below, this switching regulator typically has an efficiency of 70 to 90%.\u003c\/p\u003e\n\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\n\u003ctd\u003e \u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J4607.1200.png?4d405753ef7bf3f0dd47704dc3ed94ba\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id efficiency of pololu step-up voltage regulator u1v11f5. data-picture-id=\"0J4607\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J4607.400.jpg?4d405753ef7bf3f0dd47704dc3ed94ba\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\n\u003c\/tr\u003e\u003c\/table\u003e\n\n\u003cp class=\"clear\"\u003e The maximum achievable output current is approximately proportional to the ratio of the input voltage to the output voltage. If the \u003cem\u003einput\u003c\/em\u003e current exceeds the switch current limit (typically somewhere between 1.2 and 1.5 A), the output voltage will begin to drop. Additionally, the maximum output current can depend on other factors, including the ambient temperature, air flow, and heat sinking.\u003c\/p\u003e\n\n\u003ch3\u003e LC Voltage Spikes\u003c\/h3\u003e\n\n \u003cp\u003eWhen connecting voltage to electronic circuits, the initial rush of current can cause damaging voltage spikes that are much higher than the input voltage. In our tests with typical power leads (~30″ test clips), input voltages above 4.5 V caused voltage spikes that could potentially damage the regulator. You can suppress such spikes by soldering a 33 μF or larger electrolytic capacitor close to the regulator between VIN and GND.\u003c\/p\u003e\n\n\u003cp\u003e More 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 Weeks","offer_id":47696736715097,"sku":"POL-2562","price":10.17,"currency_code":"EUR","in_stock":true},{"title":"1 day","offer_id":47886009205081,"sku":"POL-2562\/A","price":10.17,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/1009\/7753\/files\/0J4611.1200.jpg?v=1705457042","url":"https:\/\/robot-italy.com\/en\/products\/2562-pololu-5v-step-up-voltage-regulator-u1v11f5","provider":"Robot Italy","version":"1.0","type":"link"}