{"product_id":"12v-4-5a-step-down-voltage-regulator-d42v55f12","title":"12V, 4.5A Step-Down Voltage Regulator D42V55F12","description":"\u003cp\u003eThe D42V55Fx family of synchronous buck (step-down) voltage regulators generates lower output voltages from input voltages as high as 60 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. These regulators can typically support continuous output currents between 3 A and 8 A, depending on the input voltage and output voltage (see the\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eMaximum continuous output current\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003esection below). In general, the available output current is higher for the lower-voltage versions than it is for the higher-voltage versions, and it decreases as the input voltage increases.\u003c\/p\u003e\n\u003cp\u003eThis family includes ten versions with fixed output voltages ranging from 3.3 V to 24 V:\u003c\/p\u003e\n\u003ctable class=\"active_controller_comparison center clear mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eRegulator\u003c\/th\u003e\n\u003cth\u003eOutput voltage\u003c\/th\u003e\n\u003cth\u003eTypical max\u003cbr\u003eoutput current\u003csup\u003e(1)\u003c\/sup\u003e\n\u003c\/th\u003e\n\u003cth\u003eInput voltage range\u003csup\u003e(2)\u003c\/sup\u003e\n\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5570\"\u003e#5570: D42V55F3\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e3.3 V\u003c\/td\u003e\n\u003ctd\u003e6 A\u003c\/td\u003e\n\u003ctd\u003e3.5 V – 60 V\u003c\/td\u003e\n\u003ctd rowspan=\"10\"\u003e1″ × 1″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5571\"\u003e#5571: D42V55F5\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e5 V\u003c\/td\u003e\n\u003ctd\u003e6 A\u003c\/td\u003e\n\u003ctd\u003e5 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5572\"\u003e#5572: D42V55F5.3\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e5.3 V\u003c\/td\u003e\n\u003ctd\u003e6 A\u003c\/td\u003e\n\u003ctd\u003e5.3 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5573\"\u003e#5573: D42V55F6\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e6 V\u003c\/td\u003e\n\u003ctd\u003e5.5 A\u003c\/td\u003e\n\u003ctd\u003e6 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5574\"\u003e#5574: D42V55F7\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e7.5 V\u003c\/td\u003e\n\u003ctd\u003e5 A\u003c\/td\u003e\n\u003ctd\u003e7.5 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5575\"\u003e#5575: D42V55F8\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e8.4 V\u003c\/td\u003e\n\u003ctd\u003e5 A\u003c\/td\u003e\n\u003ctd\u003e8.4 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5576\"\u003e#5576: D42V55F9\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e9 V\u003c\/td\u003e\n\u003ctd\u003e5 A\u003c\/td\u003e\n\u003ctd\u003e9 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5577\"\u003e#5577: D42V55F12\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e12 V\u003c\/td\u003e\n\u003ctd\u003e4.5 A\u003c\/td\u003e\n\u003ctd\u003e12 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5578\"\u003e#5578: D42V55F18\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e18 V\u003c\/td\u003e\n\u003ctd\u003e4 A\u003c\/td\u003e\n\u003ctd\u003e18 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5579\"\u003e#5579: D42V55F24\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e24 V\u003c\/td\u003e\n\u003ctd\u003e4 A\u003c\/td\u003e\n\u003ctd\u003e24 V – 60 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"spacer\" colspan=\"5\"\u003e \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"spacer\" colspan=\"5\"\u003eNote 1: At 42 V in. Actual achievable continuous output current is a function of input voltage and is limited by thermal dissipation. See the output current graphs on the product pages for more information.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"spacer\" colspan=\"5\"\u003e \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"spacer\" colspan=\"5\"\u003eNote 2: Minimum input voltage is subject to dropout voltage considerations; see the dropout voltage section of product pages for more information.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe regulators have input reverse voltage protection 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 class=\"note\"\u003eWe manufacture these boards in-house at our Las Vegas facility, so we can make these regulators with customized components to better meet the needs of your project, such as by customizing the output voltage. If you are interested in customization, please\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/contact\"\u003econtact us\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eFor higher-power applications, consider the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/category\/370\/d42v110fx-step-down-voltage-regulators\"\u003eD42V110Fx\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003estep-down voltage regulators, which also operate from input voltages up to 60 V and can deliver up to around twice as much current as the D42V55Fx. For lower-power applications, consider the similar\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/category\/261\/d36v28fx-step-down-voltage-regulators\"\u003eD36V28Fx\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003eor\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/category\/307\/d30v30fx-step-down-voltage-regulators\"\u003eD30V30Fx\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003efamilies of step-down voltage regulators.\u003c\/p\u003e\n\u003ch2\u003eDetails for item #5577\u003c\/h2\u003e\n\u003ctable class=\"side_by_side_pics mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003ctable class=\"picture_with_caption center mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13509.1200.jpg?92a6d5d0b8976c2542720c3daed1685a\" target=\"_blank\"\u003e\u003cimg class=\"zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13509.300.jpg?92a6d5d0b8976c2542720c3daed1685a\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13509\",\"caption\":\"\\u003cp\\u003e12V, 4.5A Step-Down Voltage Regulator D42V55F12, top view.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13509.98x98.jpg?92a6d5d0b8976c2542720c3daed1685a\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13509.600x480.jpg?92a6d5d0b8976c2542720c3daed1685a\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13509.1200.jpg?92a6d5d0b8976c2542720c3daed1685a\",\"longest_side\":1200}]' data-picture-id=\"0J13509\" data-picture-longest_side=\"1200\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\n\u003cp\u003e12V, 4.5A Step-Down Voltage Regulator D42V55F12, top view.\u003c\/p\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003ctable class=\"picture_with_caption center mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13510.1200.jpg?07698eb9b3d80e21445afe4b491b775a\" target=\"_blank\"\u003e\u003cimg class=\"zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13510.300.jpg?07698eb9b3d80e21445afe4b491b775a\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13510\",\"caption\":\"\\u003cp\\u003e12V, 4.5A Step-Down Voltage Regulator D42V55F12, bottom view.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13510.98x98.jpg?07698eb9b3d80e21445afe4b491b775a\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13510.600x480.jpg?07698eb9b3d80e21445afe4b491b775a\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13510.1200.jpg?07698eb9b3d80e21445afe4b491b775a\",\"longest_side\":1200}]' data-picture-id=\"0J13510\" data-picture-longest_side=\"1200\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\n\u003cp\u003e12V, 4.5A Step-Down Voltage Regulator D42V55F12, bottom view.\u003c\/p\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003ctable class=\"picture_with_caption center mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13519.1200.jpg?0aa1e6c1a50701a87eb61b4a29b8dc22\" target=\"_blank\"\u003e\u003cimg class=\"zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13519.305.jpg?0aa1e6c1a50701a87eb61b4a29b8dc22\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13519\",\"caption\":\"\\u003cp\\u003eSide view of the Step-Down Voltage Regulator D42V55Fx (versions with output voltages of 3.3V to 12V).\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13519.98x98.jpg?0aa1e6c1a50701a87eb61b4a29b8dc22\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13519.600x480.jpg?0aa1e6c1a50701a87eb61b4a29b8dc22\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13519.1200.jpg?0aa1e6c1a50701a87eb61b4a29b8dc22\",\"longest_side\":1200}]' data-picture-id=\"0J13519\" data-picture-longest_side=\"1200\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInput voltage: 12 V to 60 V (minimum input subject to dropout voltage considerations; see the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5577#dropout\"\u003edropout voltage section\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003efor details)\u003c\/li\u003e\n\u003cli\u003eOutput voltage: 12 V with 3% accuracy\u003c\/li\u003e\n\u003cli\u003eTypical maximum continuous output current: 3.5 A to 6.5 A (see the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5577#maxcurrent\"\u003emaximum continuous output current graph\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003ebelow)\u003c\/li\u003e\n\u003cli\u003eTypical efficiency of 85% to 95%, depending on input voltage and load (see the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5577#efficiency\"\u003eefficiency graph\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003ebelow)\u003c\/li\u003e\n\u003cli\u003eSwitching frequency: ~400 kHz under heavy loads\u003c\/li\u003e\n\u003cli\u003e\u0026lt; 0.2 mA typical no-load quiescent current (see the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5577#quiescent\"\u003equiescent current graph\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003ebelow)\u003c\/li\u003e\n\u003cli\u003eOptional enable input for disconnecting the load and putting the regulator into a low-power state that typically draws under 0.1 mA\u003c\/li\u003e\n\u003cli\u003ePower-good output can be used for sequencing, fault detection, and voltage monitoring\u003c\/li\u003e\n\u003cli\u003eSoft-start feature limits inrush current and gradually ramps output voltage\u003c\/li\u003e\n\u003cli\u003eIntegrated reverse-voltage protection, over-current protection, and over-temperature shutoff\u003c\/li\u003e\n\u003cli\u003eCompact size: 1″ × 1″ × 0.355″ (25.4 mm × 25.4 mm × 9 mm)\u003c\/li\u003e\n\u003cli\u003eThree 0.086″ mounting holes for #2 or M2\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/category\/101\/nuts-and-screws\"\u003escrews\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\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\u003cp\u003e \u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center wide mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13527.1200.png?207828ee090d744ddd3232c4e29f3d04\" target=\"_blank\"\u003e\u003cimg class=\"wide zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13527.800.jpg?207828ee090d744ddd3232c4e29f3d04\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13527\",\"caption\":\"\\u003cp\\u003eTypical efficiency of the 12V, 4.5A Step-Down Voltage Regulator D42V55F12.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13527.98x98.jpg?207828ee090d744ddd3232c4e29f3d04\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13527.600x480.jpg?207828ee090d744ddd3232c4e29f3d04\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13527.1200.png?207828ee090d744ddd3232c4e29f3d04\",\"longest_side\":1200}]' data-picture-id=\"0J13527\" data-picture-longest_side=\"1200\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eConnections\u003c\/h3\u003e\n\u003cp\u003eThis regulator has six connections, some of which are duplicated on multiple pins:\u003c\/p\u003e\n\u003cdiv class=\"content-wrapping-blocks-centered\"\u003e\n\u003ctable class=\"picture_with_caption center mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13518.1200.jpg?213a4b55789ef8c703ea38d32a15cc62\" target=\"_blank\"\u003e\u003cimg class=\"zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13518.450.jpg?213a4b55789ef8c703ea38d32a15cc62\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13518\",\"caption\":\"\\u003cp\\u003ePinout of the Step-Down Voltage Regulator D42V55Fx.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13518.98x98.jpg?213a4b55789ef8c703ea38d32a15cc62\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13518.600x480.jpg?213a4b55789ef8c703ea38d32a15cc62\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13518.1200.jpg?213a4b55789ef8c703ea38d32a15cc62\",\"longest_side\":1200}]' data-picture-id=\"0J13518\" data-picture-longest_side=\"1200\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable class=\"reference mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePin\u003c\/th\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVOUT\u003c\/td\u003e\n\u003ctd\u003eoutput\u003c\/td\u003e\n\u003ctd\u003eRegulated output voltage.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGND\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003ctd\u003eGround.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVIN\u003c\/td\u003e\n\u003ctd\u003einput\u003c\/td\u003e\n\u003ctd\u003eInput power for the regulator. Voltages between 3.5 V and 60 V can be applied to VIN, but generally the effective lower limit of VIN is VOUT plus the regulator’s dropout voltage, which varies with the load (see below for\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/product\/5577#dropout\"\u003egraphs of the dropout voltage\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003eas a function of the load).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVRP\u003c\/td\u003e\n\u003ctd\u003eoutput or input\u003c\/td\u003e\n\u003ctd\u003eProvides access to the input voltage after reverse-voltage protection. This pin can be used as an output to power other devices or as an input point for the supply voltage that bypasses the reverse protection on VIN.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePG\u003c\/td\u003e\n\u003ctd\u003eopen-drain output\u003c\/td\u003e\n\u003ctd\u003eOptional “Power Good” indicator that goes low when the regulator’s output voltage either rises more than 10% above or falls more than 8% below the nominal voltage (typical, with hysteresis). It drives low during soft start and while the regulator is disabled.\u003cspan\u003e \u003c\/span\u003e\u003cins\u003eAn external pull-up resistor to the desired logic voltage rail is required to use this pin (100 kΩ recommended).\u003c\/ins\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEN\u003c\/td\u003e\n\u003ctd\u003einput\u003c\/td\u003e\n\u003ctd\u003eOptional enable input that is pulled up to VIN by default through a 1 MΩ resistor. Reduce the voltage on this pin below 0.5 V to disconnect the load and put the regulator into a low-power shutdown mode that draws approximately 50 µA plus 1 µA per volt on VIN. Shutdown mode can be exited by bringing the EN voltage above 1 V. This pin can be left disconnected if this feature is not required.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003eAll of the connections are arranged on a 0.1″ grid for compatibility with solderless\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/category\/28\/solderless-breadboards\"\u003ebreadboards\u003c\/a\u003e,\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/category\/134\/0.1-2.54-mm-male-headers\"\u003e0.1″ male headers\u003c\/a\u003e, and\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.pololu.com\/category\/50\/0.1-2.54-mm-female-headers\"\u003e0.1″ female headers\u003c\/a\u003e. The power connections (VOUT, GND, VIN, and VRP) are duplicated across both rows of through-holes, allowing two header pins to be used for each connection. Note that the EN and PG pins are\u003cspan\u003e \u003c\/span\u003e\u003cins\u003enot\u003c\/ins\u003e\u003cspan\u003e \u003c\/span\u003eduplicated and are adjacent on different rows, so if you intend to use the regulator on a breadboard, be careful to avoid installing header pins in a way that shorts EN to PG. The PG connection is the only one not accessible along the edge of the board.\u003c\/p\u003e\n\u003ch3 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\u003cp\u003e \u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center wide mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13530.1200.png?f22e710175b5397926cce2ef44570d8a\" target=\"_blank\"\u003e\u003cimg class=\"wide zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13530.800.jpg?f22e710175b5397926cce2ef44570d8a\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13530\",\"caption\":\"\\u003cp\\u003eTypical maximum continuous output current of the Step-Down Voltage Regulator D42V55Fx.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13530.98x98.jpg?f22e710175b5397926cce2ef44570d8a\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13530.600x480.jpg?f22e710175b5397926cce2ef44570d8a\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13530.1200.png?f22e710175b5397926cce2ef44570d8a\",\"longest_side\":1200}]' data-picture-id=\"0J13530\" data-picture-longest_side=\"1200\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"note_warning\"\u003eDuring normal operation, this product can get hot enough to burn you. Take care when handling this product or other components connected to it.\u003cbr\u003e\u003cbr\u003eThis regulator has a protection feature that gracefully limits the output current, which can help protect it from thermal damage in applications loads that exceed the regulator’s capabilities. However, this limiting is insufficient to cover all possible combinations of input voltage, output voltage, and load, so we recommend you take precautions to ensure that the continuously applied loads of your application will not exceed the currents shown in the above graph. If your application has the potential to expose the regulator to higher loads, please consider using additional external protective components such as fuses or circuit breakers.\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 for the different regulator versions 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 draws approximately 50 µA plus 1 µA per volt on VIN (note that for high input voltages, this current draw can exceed the quiescent current draw of the regulator).\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable class=\"picture_with_caption center wide mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13531.1200.png?883b04eb9981eeeadf0fc3edbcb775b0\" target=\"_blank\"\u003e\u003cimg class=\"wide zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13531.800.jpg?883b04eb9981eeeadf0fc3edbcb775b0\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13531\",\"caption\":\"\\u003cp\\u003eTypical quiescent current of the Step-Down Voltage Regulator D42V55Fx.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13531.98x98.jpg?883b04eb9981eeeadf0fc3edbcb775b0\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13531.600x480.jpg?883b04eb9981eeeadf0fc3edbcb775b0\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13531.1200.png?883b04eb9981eeeadf0fc3edbcb775b0\",\"longest_side\":1200}]' data-picture-id=\"0J13531\" data-picture-longest_side=\"1200\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\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 two graphs below shows the dropout voltages for this family (the 3.3 V version has its own separate graph because its dropout voltage curve is very different from the other members of this family):\u003c\/p\u003e\n\u003cdiv class=\"content-wrapping-blocks-centered\"\u003e\n\u003ctable class=\"picture_with_caption center mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13532.1200.png?08d80d15b6f4c6b54088fc35f6919680\" target=\"_blank\"\u003e\u003cimg class=\"zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13532.500h.jpg?08d80d15b6f4c6b54088fc35f6919680\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13532\",\"caption\":\"\\u003cp\\u003eTypical dropout voltage of the 3.3V, 6A Step-Down Voltage Regulator D42V55F3.\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13532.98x98.jpg?08d80d15b6f4c6b54088fc35f6919680\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13532.600x480.jpg?08d80d15b6f4c6b54088fc35f6919680\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13532.1200.png?08d80d15b6f4c6b54088fc35f6919680\",\"longest_side\":1200}]' data-picture-id=\"0J13532\" data-picture-longest_side=\"1200\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable class=\"picture_with_caption center mceItemTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca class=\"noscript-fallback\" href=\"https:\/\/a.pololu-files.com\/picture\/0J13533.1200.jpg?46b1cf21872d664d23ddb9f8f30b3dd8\" target=\"_blank\"\u003e\u003cimg class=\"zoomable\" src=\"https:\/\/a.pololu-files.com\/picture\/0J13533.500h.jpg?46b1cf21872d664d23ddb9f8f30b3dd8\" alt=\"\" data-gallery-pictures='[{\"id\":\"0J13533\",\"caption\":\"\\u003cp\\u003eTypical dropout voltage of the Step-Down Voltage Regulator D42V55Fx (5V output versions and above).\\u003c\/p\\u003e\",\"url_tiny\":\"https:\/\/a.pololu-files.com\/picture\/0J13533.98x98.jpg?46b1cf21872d664d23ddb9f8f30b3dd8\",\"url_medium\":\"https:\/\/a.pololu-files.com\/picture\/0J13533.600x480.jpg?46b1cf21872d664d23ddb9f8f30b3dd8\",\"url_full\":\"https:\/\/a.pololu-files.com\/picture\/0J13533.1200.jpg?46b1cf21872d664d23ddb9f8f30b3dd8\",\"longest_side\":1400}]' data-picture-id=\"0J13533\" data-picture-longest_side=\"1400\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"POLOLU","offers":[{"title":"Default Title","offer_id":52404628029723,"sku":"Pololu #5577","price":3599.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/3325\/0587\/files\/0J13508.1200.jpg?v=1782476398","url":"https:\/\/mgsl.in\/products\/12v-4-5a-step-down-voltage-regulator-d42v55f12","provider":"MG Super Labs","version":"1.0","type":"link"}