{"product_id":"2842-pololu-3-3v-500ma-step-down-voltage-regulator-d24v5f3","title":"Pololu 3.3V, 500mA Step-Down Voltage Regulator D24V5F3","description":"\u003cp\u003eThe compact (0.4″ × 0.5″) D24V5F3 synchronous buck voltage regulator takes an input voltage of up to 36 V and efficiently reduces it to \u003cstrong\u003e3.3 V\u003c\/strong\u003e while allowing for a maximum output current of \u003cstrong\u003e500 mA\u003c\/strong\u003e. This regulator offers typical efficiencies between 80% and 90% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 3.3 V. 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\/0J5237.1200.jpg?871e92934fd5c93cd85d78aee5264736\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-down voltage regulator d24v5fx bottom view with dimensions. data-picture-id=\"0J5237\" data-picture-longest_side=\"429\" src=\"https:\/\/a.pololu-files.com\/picture\/0J5237.250.jpg?871e92934fd5c93cd85d78aee5264736\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ctable class=\"picture_with_caption right\"\u003e\n\u003ctr\u003e\u003ctd style=\"max-width: 250px\"\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J6007.1200.jpg?2bbadc4cf3ac098c6ee53658ffc2f939\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-down voltage regulators d24v10fx and d24v5fx next to a regulator in to-220 package. data-picture-id=\"0J6007\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J6007.250.jpg?2bbadc4cf3ac098c6ee53658ffc2f939\"\u003e\u003c\/a\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth style=\"max-width: 250px\"\u003e\u003cp\u003ePololu step-down voltage regulators D24V10Fx and D24V5Fx next to a 7805 voltage regulator in TO-220 package.\u003c\/p\u003e\u003c\/th\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe D24V5Fx family of buck (step-down) voltage regulators generates lower output voltages from input voltages as high as 36 V.  They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and have a typical efficiency between 80% to 93%, which is much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large.  These regulators have a power-save mode that activates at light loads and a low quiescent (no load) current draw, which make them well suited for low-power applications that are run from a battery.  These regulators are available in eight different fixed output voltages:\u003c\/p\u003e\n\u003cp\u003eAlternatives available with variations in these parameter(s):\n\u003ca class=\"select_by_specification_link\" data-lightbox-link=\"true\" data-lightbox-height=\"20rem\" data-lightbox-width=\"50rem\" href=\"\/catalog\/select-by-specification?parameters=0J130\u0026amp;product=2842\u0026amp;products=2842\"\u003e\u003cspan class=\"select_by_specification_parameter\"\u003eoutput voltage\u003c\/span\u003e\n\u003cspan class=\"select_by_specification_main_link\"\u003eSelect variant…\u003c\/span\u003e\n\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eThe different versions of this regulator all look very similar, so the bottom silkscreen includes a blank space where you can add your own distinguishing marks or labels. This product page applies to all eight versions of the D24V5Fx family.\u003c\/p\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\u003cp\u003eIf you need more output current, consider the very similar D24V10Fx family of step-down voltage regulators, which can deliver up to 1 A in several different output voltages:\u003c\/p\u003e\n\u003cp\u003eAlternatives available with variations in these parameter(s):\n\u003ca class=\"select_by_specification_link\" data-lightbox-link=\"true\" data-lightbox-height=\"20rem\" data-lightbox-width=\"50rem\" href=\"\/catalog\/select-by-specification?parameters=0J130\u0026amp;product=2842\u0026amp;products=2830\"\u003e\u003cspan class=\"select_by_specification_parameter\"\u003eoutput voltage\u003c\/span\u003e\n\u003cspan class=\"select_by_specification_main_link\"\u003eSelect variant…\u003c\/span\u003e\n\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eThe picture on the right shows a 1 A D24V10Fx regulator next to a 0.5 A D24V5Fx regulator and a common 7805 linear regulator in a TO-220 package.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\t\u003cli\u003eInput voltage:\n\t\u003cul\u003e\n\t\t\u003cli\u003e3 V to 36 V for output voltages of 1.8 V and 2.5 V\u003c\/li\u003e\n\t\t\u003cli\u003e[\u003ci\u003eoutput voltage + dropout voltage\u003c\/i\u003e] to 36 V for output voltages of 3.3 V and higher (see below for more information on dropout voltage)\u003c\/li\u003e\n\t\u003c\/ul\u003e\n\u003c\/li\u003e\n\t\u003cli\u003eFixed 1.8 V, 2.5 V, 3.3 V, 5 V, 6 V, 9 V, 12 V, or 15 V output (depending on regulator version) with 4% accuracy\u003c\/li\u003e\n\t\u003cli\u003eMaximum output current: 500 mA\u003c\/li\u003e\n\t\u003cli\u003eTypical efficiency of 80% to 93%\u003c\/li\u003e\n\t\u003cli\u003e500 kHz switching frequency (when not in power-save mode)\u003c\/li\u003e\n\t\u003cli\u003e200 μA typical no-load quiescent current\u003c\/li\u003e\n\t\u003cli\u003eOver-current and short-circuit protection, over-temperature shutoff\u003c\/li\u003e\n\t\u003cli\u003eSmall size:  0.5″ × 0.4″ × 0.1″ (13 mm × 10 mm × 3 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable class=\"picture_with_caption right\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J5241.1200.jpg?e248585f9b7b73a7ad95e2907b1c007f\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-down voltage regulators d24v5fx in a breadboard. data-picture-id=\"0J5241\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J5241.250.jpg?e248585f9b7b73a7ad95e2907b1c007f\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ctable class=\"picture_with_caption right\"\u003e\u003ctr\u003e\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J5239.1200.jpg?a518232bf6391db661348928693d3860\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-down voltage regulator d24v5fx in a breadboard. data-picture-id=\"0J5239\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J5239.250.jpg?a518232bf6391db661348928693d3860\"\u003e\u003c\/a\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch2\u003eUsing the regulator\u003c\/h2\u003e\n\u003ch3\u003eConnections\u003c\/h3\u003e\n\u003cp\u003eThe buck 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 0.4 V) to turn off the output and put the board into a low-power state.  There is a 100 k\u0026amp;ohm; pull-up resistor between the \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e pin and VIN, so if you want to leave the board permanently enabled, the \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e pin can be left disconnected.  While the \u003cfont style=\"text-decoration: overline;\"\u003eSHDN\u003c\/font\u003e pin is being driven low, the current draw of the regulator is dominated by the current through the pull-up resistor and will be proportional to the input voltage. (At 36 V in it will draw about 360 μA.)\u003c\/p\u003e\n\u003cp\u003eThe input voltage, VIN, powers the regulator.  Voltages between 3 V and 36 V can be applied to VIN, but for versions of the regulator that have an output voltage higher than 3 V, the effective lower limit of VIN is VOUT plus the regulator’s dropout voltage, which varies approximately linearly with the load (see below for graphs of dropout voltages as a function of the load).  Additionally, please be wary of destructive LC spikes (see below for more information).\u003c\/p\u003e\n\u003cp\u003eThe output voltage, VOUT, is fixed and depends on the regulator version: the D24V5F1 version outputs 1.5 V, D24V5F2 version outputs 2.5 V, the D24V5F3 version outputs 3.3 V, the D24V5F5 version outputs 5 V, the D24V5F6 version outputs 6 V, the D24V5F9 version outputs 9 V, the D24V5F12 version outputs 12 V, and the D24V5F15 version outputs 15 V\u003c\/p\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\/0J5240.1200.jpg?1e42b8676cfa6c0f82cbe6597a9bf9fc\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id step-down voltage regulator d24v5fx with included hardware. data-picture-id=\"0J5240\" data-picture-longest_side=\"1200\" src=\"https:\/\/a.pololu-files.com\/picture\/0J5240.300.jpg?1e42b8676cfa6c0f82cbe6597a9bf9fc\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003c\/tr\u003e\u003c\/table\u003e\n\u003ch3\u003eTypical efficiency and output current\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.  This family of switching regulators typically has an efficiency of 80% to 95%, though the actual efficiency in a given system depends on input voltage, output voltage, and output current.  See the efficiency graph near the bottom of this page for more information.\u003c\/p\u003e\n\u003cp\u003eIn order to achieve a high efficiency at low loads, this regulator automatically goes into a power-save mode where the switching frequency is reduced.  In power-save mode, the switching frequency of the regulator changes as necessary to minimize power loss.  This could make it harder to filter out noise on the output caused by switching.\u003c\/p\u003e\n\u003ch3\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.  See the “Details” section below for more information on the dropout voltage for this specific regulator version.\u003c\/p\u003e\n\u003ch2\u003e\nDetails for item #2842\n\u003c\/h2\u003e\n\u003cp\u003eThe graphs below show the typical efficiency and dropout voltage of the 3.3 V D24V5F3 regulator as a function of the output current:\u003c\/p\u003e\n\u003cdiv class=\"left\"\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J5224.1200.png?2a10d131c4ea9e019ecedf6fac8a3828\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id efficiency of pololu step-down voltage regulator d24v5f3. data-picture-id=\"0J5224\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J5224.400.jpg?2a10d131c4ea9e019ecedf6fac8a3828\"\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 class=\"left\"\u003e\n\u003ctable class=\"picture_with_caption center\"\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J5225.1200.png?7246e1dee2a1aa254b05e9b66badfa4f\" class=\"noscript-fallback\"\u003e\u003cimg alt=\"\" class=\"zoomable\" data-gallery-pictures=\"[{\" id dropout voltage of pololu step-down regulator d24v5f3. data-picture-id=\"0J5225\" data-picture-longest_side=\"600\" src=\"https:\/\/a.pololu-files.com\/picture\/0J5225.400.jpg?7246e1dee2a1aa254b05e9b66badfa4f\"\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\u003cp class=\"clear\"\u003e\u003c\/p\u003e\n\u003ch2\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 (36 V), the regulator can be destroyed. In our tests with typical power leads (~30″ test clips), input voltages above 20 V caused spikes over 36 V.\u003c\/p\u003e\n\u003cp class=\"note_warning\"\u003eIf you are connecting more than 20 V or your power leads or supply has 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 50 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":47696617800025,"sku":"POL-2842","price":8.71,"currency_code":"EUR","in_stock":true},{"title":"1 Giorno","offer_id":47885971620185,"sku":"POL-2842\/A","price":8.71,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/1009\/7753\/files\/0J5238.1200_64c71eca-088a-495e-acab-c09fd717125b.jpg?v=1705454814","url":"https:\/\/robot-italy.com\/products\/2842-pololu-3-3v-500ma-step-down-voltage-regulator-d24v5f3","provider":"Robot Italy","version":"1.0","type":"link"}