{"product_id":"3799-4-25v-adjustable-step-down-voltage-regulator-d36v6ahv","title":"4-25V Adjustable Step-down Voltage Regulator D36V6AHV","description":"\u003cp\u003eThis compact (0.4″ × 0.6″) switching step-down (or buck) voltage regulator takes input voltages between 4 V and 50 V and efficiently reduces them to a lower, user-adjustable voltage set by an on-board trimmer potentiometer.  It has an output voltage range of \u003cstrong\u003e4 V to 25 V\u003c\/strong\u003e and a maximum output current of \u003cstrong\u003e600 mA\u003c\/strong\u003e.  It has a very low dropout, so it can be used with input voltages that are within a few hundred millivolts of its output.  The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.\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\/0J2566.1200.jpg?5cc38fe416b7d8c1e6279823f92c28fe\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-down voltage regulator d36v6ax bottom view with dimensions. data-picture-id=\"0J2566\" data-picture-longest_side=\"800\" src=\"https:\/\/a.pololu-files.com\/picture\/0J2566.250.jpg?5cc38fe416b7d8c1e6279823f92c28fe\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003cp\u003eThe D36V6x family of buck (step-down) voltage regulators generates lower output voltages from input voltages as high as 50 V.  They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters), which makes them much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large.  This family includes seven versions with fixed output voltages ranging from 3.3 V to 15 V and two adjustable versions that can be set using a trimmer potentiometer:\u003c\/p\u003e\n\u003cul\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3791\"\u003eD36V6F3: Fixed 3.3V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3792\"\u003eD36V6F5: Fixed 5V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3793\"\u003eD36V6F6: Fixed 6V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3794\"\u003eD36V6F7: Fixed 7.5V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3795\"\u003eD36V6F9: Fixed 9V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3796\"\u003eD36V6F12: Fixed 12V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3797\"\u003eD36V6F15: Fixed 15V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3798\"\u003eD36V6ALV: Adustable 2.5 – 7.5 V output\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/3799\"\u003eD36V6AHV: Adustable 4 – 25 V output\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe regulators feature short-circuit\/over-current protection, and thermal shutdown helps prevent damage from overheating.  The boards do \u003cstrong\u003enot\u003c\/strong\u003e have reverse-voltage protection.\u003c\/p\u003e\n\u003ch2\u003e\nDetails for item #3799\n\u003c\/h2\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\t\u003cli\u003eInput voltage: 4 V to 50 V (input must exceed the output by the dropout voltage; see the \u003ca href=\"#dropout\"\u003edropout voltage section\u003c\/a\u003e for details)\u003c\/li\u003e\n\t\u003cli\u003eOutput voltage: adjustable from 4 V to 25 V by on-board trimmer potentiometer\u003c\/li\u003e\n\t\u003cli\u003eMaximum output current: 600 mA (see the \u003ca href=\"#maxcurrent\"\u003emaximum continuous output current graph\u003c\/a\u003e below)\u003c\/li\u003e\n\t\u003cli\u003eFixed 2.1 MHz switching frequency\u003c\/li\u003e\n\t\u003cli\u003eHigh-voltage enable input can put the board into a low-power state where it draws less than 2 μA (typical)\u003c\/li\u003e\n\t\u003cli\u003eLow quiescent current: \u0026lt; 2 mA (see the \u003ca href=\"#quiescent\"\u003equiescent current graph\u003c\/a\u003e below)\u003c\/li\u003e\n\t\u003cli\u003eOver-current and short-circuit protection, over-temperature shutoff\u003c\/li\u003e\n\t\u003cli\u003eSmall size:  0.6″ × 0.4″ × 0.15″ (15 mm × 10 mm × 4 mm)\u003c\/li\u003e\n\t\u003cli\u003eWeight: 0.6 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnections\u003c\/h3\u003e\n\u003cp\u003eThis 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\u003cp\u003eThe \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e pin can be driven low (under 1.25 V) to turn off the output and put the board into a low-power state (\u0026lt; 2 μA typical).  The regulator is enabled by default, and this input can be left disconnected if you do not need this feature.\u003c\/p\u003e\n\u003cp\u003eThe input voltage, VIN, powers the regulator and should be between 4 V and 50 V.  If the input voltage gets too close to the output voltage, the output will start to drop, so you should ensure that VIN exceeds VOUT by at least the dropout voltage, which varies with the output voltage and the load (see below for \u003ca href=\"#dropout\"\u003egraphs of the dropout voltage\u003c\/a\u003e as a function of the load).  Additionally, please be wary of destructive LC spikes (\u003ca href=\"#lcspikes\"\u003esee below for more information\u003c\/a\u003e).\u003c\/p\u003e\n\u003cp\u003eThe output voltage, VOUT, is determined by the trimmer potentiometer position, with clockwise turns increasing the output voltage.  You can use a multimeter to measure the output as you set it.  Please note that the output voltage can be affected by a screwdriver touching the potentiometer, so the output measurement should be done with nothing touching the potentiometer. When setting the output voltage, note that the buck regulator can only produce voltages lower than the input voltage.  The following graph shows approximately how the potentiometer position maps to the output voltage settings on the D36V6ALV (blue curve) and D36V6AHV (red curve).\u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center wide\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"max-width: 600px\"\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J2603.1200.png?a95e10965cb6a54c573c3e2e5ab21aeb\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"wide zoomable\" data-gallery-pictures=\"[{\" id voltage settings for the adjustable and buck regulators data-picture-id=\"0J2603\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J2603.600.png?a95e10965cb6a54c573c3e2e5ab21aeb\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003cth style=\"max-width: 600px\"\u003e\u003cp\u003eOutput voltage settings for the adjustable 2.5-7.5V and 4-25V buck regulators (D36V6Ax\/D24V6Ax\/D24V3Ax).\u003c\/p\u003e\u003c\/th\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe four connections are labeled on the back side of the PCB and 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\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J9266.1200.jpg?d16ce667652506fea061c7ec11082917\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-down voltage regulator d36v6ax with included male headers. data-picture-id=\"0J9266\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J9266.300.jpg?d16ce667652506fea061c7ec11082917\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch3\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\u003cdiv style=\"float:left;\"\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J9279.1200.png?c456471399fcdfccc661c03b48640242\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id efficiency of adjustable step-down voltage regulator d36v6ahv with vout='5\\u0026nbsp;V.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J9279.98x98.jpg?c456471399fcdfccc661c03b48640242\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J9279.600x480.jpg?c456471399fcdfccc661c03b48640242\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J9279.1200.png?c456471399fcdfccc661c03b48640242\",\"longest_side\":600}]\"' data-picture-id=\"0J9279\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J9279.400.jpg?c456471399fcdfccc661c03b48640242\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"float:left;\"\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J9280.1200.png?d1b7793ec6dce372b3a7a39a39377c7f\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id efficiency of adjustable step-down voltage regulator d36v6ahv with vout='12\\u0026nbsp;V.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J9280.98x98.jpg?d1b7793ec6dce372b3a7a39a39377c7f\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J9280.600x480.jpg?d1b7793ec6dce372b3a7a39a39377c7f\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J9280.1200.png?d1b7793ec6dce372b3a7a39a39377c7f\",\"longest_side\":600}]\"' data-picture-id=\"0J9280\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J9280.400.jpg?d1b7793ec6dce372b3a7a39a39377c7f\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"float:left;\"\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J9281.1200.png?6b0d69f50fc722360e547311598af8b7\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id efficiency of adjustable step-down voltage regulator d36v6ahv with vout='18\\u0026nbsp;V.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J9281.98x98.jpg?6b0d69f50fc722360e547311598af8b7\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J9281.600x480.jpg?6b0d69f50fc722360e547311598af8b7\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J9281.1200.png?6b0d69f50fc722360e547311598af8b7\",\"longest_side\":600}]\"' data-picture-id=\"0J9281\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J9281.400.jpg?6b0d69f50fc722360e547311598af8b7\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"float:left;\"\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J9282.1200.png?5f639163fcaea54ebcd9ef1b9a82b9dc\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id efficiency of adjustable step-down voltage regulator d36v6ahv with vout='24\\u0026nbsp;V.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J9282.98x98.jpg?5f639163fcaea54ebcd9ef1b9a82b9dc\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J9282.600x480.jpg?5f639163fcaea54ebcd9ef1b9a82b9dc\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J9282.1200.png?5f639163fcaea54ebcd9ef1b9a82b9dc\",\"longest_side\":600}]\"' data-picture-id=\"0J9282\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J9282.400.jpg?5f639163fcaea54ebcd9ef1b9a82b9dc\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"clear \" id=\"maxcurrent\"\u003eMaximum continuous output current\u003c\/h3\u003e\n\u003cp\u003eThe maximum achievable output current of these regulators 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 these regulators 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 continous output currents of step-down voltage regulator d36v6fx. data-picture-id=\"0J9275\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J9275.600.png?312f87aa66802d4fa75ce2e9c955e929\"\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\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 for the different regulator versions as a function of the input voltage.  The module’s \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e input can be driven low to put the board into a low-power state where it typically draws under 2 μA.\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 currents of step-down voltage regulator d36v6fx. data-picture-id=\"0J9276\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J9276.600.png?d675910d3bbe2c407ac671d66e89e6fc\"\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch3 id=\"dropout\"\u003eTypical dropout voltage\u003c\/h3\u003e\n\u003cp\u003eThe dropout voltage of a step-down regulator is the minimum amount by which the input voltage must exceed the regulator’s target output voltage in order to ensure the target output can be achieved.  For example, if a 5 V regulator has a 1 V dropout voltage, the input must be at least 6 V to ensure the output is the full 5 V.  Generally speaking, the dropout voltage increases as the output current increases.  The graph below shows the dropout voltages for the different members of this regulator family:\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 dropout voltages of step-down voltage regulator d36v6fx. data-picture-id=\"0J9274\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J9274.600.png?0b3db6a3cc882ed86a45f30cee26fa9c\"\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003cp class=\"clear\"\u003e\u003c\/p\u003e\n\u003ch2 id=\"lcspikes\"\u003eLC voltage spikes\u003c\/h2\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 the regulator’s maximum voltage (50 V), the regulator can be destroyed. In our tests with typical power leads (~30″ test clips), input voltages above 28 V caused spikes over 50 V.\u003c\/p\u003e\n\u003cp class=\"note_warning\"\u003eIf you are connecting more than 28 V or your power leads or supply has high inductance, we recommend soldering a suitably rated 33 μF or larger electrolytic capacitor close to the regulator between VIN and GND.\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":47696624976217,"sku":"POL-3799","price":13.1,"currency_code":"EUR","in_stock":true},{"title":"1 Giorno","offer_id":47885973324121,"sku":"POL-3799\/A","price":13.1,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/1009\/7753\/files\/0J9265.1200.jpg?v=1705454975","url":"https:\/\/robot-italy.com\/products\/3799-4-25v-adjustable-step-down-voltage-regulator-d36v6ahv","provider":"Robot Italy","version":"1.0","type":"link"}