{"product_id":"step-down-voltage-regulator-d36v28fx","title":"Step-Down Voltage Regulator D36V28Fx","description":"\u003cp\u003eThe D36V28Fx family of buck (step-down) voltage regulators generates lower output voltages from input voltages as high as 50 V.\u003c\/p\u003e\n\u003cp\u003eThey 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 2 A and 4 A, depending on the input voltage and output voltage (see the Maximum continuous output current section below). In general, the available output current is a little 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\u003eThe regulators have reverse voltage protection up to 40 V, output undervoltage and overvoltage protection, over-current protection, and short-circuit 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\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003cth\u003eD36V28F3\u003c\/th\u003e\n\u003cth\u003eD36V28F5\u003c\/th\u003e\n\u003cth\u003eD36V28F9\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e4.5 V to 50 V\u003c\/td\u003e\n\u003ctd\u003e5.3 V to 50 V\u003c\/td\u003e\n\u003ctd\u003e9.8 V to 50 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3 V\u003c\/td\u003e\n\u003ctd\u003e5 V\u003c\/td\u003e\n\u003ctd\u003e9 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e4%\u003c\/td\u003e\n\u003ctd\u003e4%\u003c\/td\u003e\n\u003ctd\u003e4%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical maximum continuous output current\u003c\/td\u003e\n\u003ctd\u003e3.2 A to 4.5 A\u003c\/td\u003e\n\u003ctd\u003e2.5 A to 4 A\u003c\/td\u003e\n\u003ctd\u003e2.3 A to 3.4 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical efficiency\u003c\/td\u003e\n\u003ctd\u003e80% to 90%\u003c\/td\u003e\n\u003ctd\u003e80% to 90%\u003c\/td\u003e\n\u003ctd\u003e85% to 95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical no-load quiescent current\u003c\/td\u003e\n\u003ctd\u003e2 mA to 3 mA\u003c\/td\u003e\n\u003ctd\u003e2 mA to 3 mA\u003c\/td\u003e\n\u003ctd\u003e1 mA to 3 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cul\u003e\n\u003cli\u003eSwitching frequency: ~500 kHz under heavy loads\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower-save mode with ultrasonic operation that increases light load efficiency by reducing switching frequency, but keeps it above the audible range (20 kHz)\u003c\/li\u003e\n\u003cli\u003eEnable input with precise cutoff threshold for disconnecting the load and putting the regulator into a low-power state that draws approximately 10 µA to 20 µA per volt on VIN\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e“Power good” output indicates when the regulator cannot adequately maintain the output voltage\u003c\/li\u003e\n\u003cli\u003eOutput undervoltage and overvoltage protection\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 up to 40 V, over-current and short-circuit protection, over-temperature shutoff\u003c\/li\u003e\n\u003cli\u003eCompact size: 0.7″ × 0.8″ × 0.345″ (17.8 mm × 20.3 mm × 8.8 mm)\u003c\/li\u003e\n\u003cli\u003eTwo 0.086″ mounting holes for #2 or M2 screws\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eConnections\u003c\/h2\u003e\n\u003cp\u003eThis regulator has six connections: power good (PG), enable (EN), input voltage (VIN), output voltage (VOUT), and two ground (GND) connections.\u003c\/p\u003e\n\u003cp\u003eThe “power good” indicator, \u003cstrong\u003ePG\u003c\/strong\u003e, is an open-drain output that goes low when the regulator’s output voltage either rises more than 20% above or falls more than 10% below the nominal voltage (with hysteresis). \u003cspan style=\"text-decoration: underline;\"\u003eAn external pull-up resistor is required to use this pin.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe regulator, which is enabled by default, can be put into a low-power sleep state by reducing the voltage on the \u003cstrong\u003eEN\u003c\/strong\u003e pin below 1.2 V, and it can be brought out of this state again by increasing the voltage on EN past 1.35 V. The quiescent current draw in this sleep mode is dominated by the current in the 100 kΩ pull-up resistor from ENABLE to VIN and in the reverse-voltage protection circuit, which altogether will be between 10 µA and 20 µA per volt on VIN. The tight tolerance of the enable input allows a precise low-VIN cutoff to be set, such as with the output of an external voltage divider powered by VIN, which is useful for battery powered applications where draining the battery below a particular voltage threshold could permanently damage it.\u003c\/p\u003e\n\u003cp\u003eThe input voltage, \u003cstrong\u003eVIN\u003c\/strong\u003e, powers the regulator. Voltages between 4.5 V and 50 V can be applied to VIN, but generally 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 the dropout voltage as a function of the load).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVOUT\u003c\/strong\u003e is the regulated output voltage.\u003c\/p\u003e\n\u003cp\u003eThe six connections are arranged on a 0.1″ grid for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1″ grid. The PG connection is the only one not located along the edge of the board. A 6×1 straight male header strip and a 5×1 right-angle male header strip are included with the regulator; one pin of the straight header can optionally be broken off and soldered into PG.\u003c\/p\u003e\n\u003ch2\u003eTypical efficiency\u003c\/h2\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\u003ch2\u003eMaximum continuous output current\u003c\/h2\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\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/0J10056.600_480x480.png?v=1622129346\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDuring normal operation, this product can get \u003cspan style=\"color: #ff2a00;\" data-mce-style=\"color: #ff2a00;\"\u003ehot\u003c\/span\u003e enough to burn you. Take care when handling this product or other components connected to it.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eQuiescent current\u003c\/h2\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 typically draws between 10 µA and 20 µA per volt on VIN.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/0J10057.600_480x480.png?v=1622129320\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eTypical dropout voltage\u003c\/h2\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:\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/0J10058.600_480x480.png?v=1622129302\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eUseful Resources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/d36v28fx-step-down-voltage-regulators-dimensions.pdf?v=1622130402\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDimension diagram of the Step-Down Voltage Regulator D36V28Fx\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/d36v28fx-step-down-voltage-regulators.step?v=1622130403\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e3D model of the Step-Down Voltage Regulator D36V28Fx\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/reg24a-drill.dxf?v=1622130402\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDrill guide for the Step-Down Voltage Regulator D36V28Fx\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pololu","offers":[{"title":"3.3V 3.6A","offer_id":39354095534163,"sku":"POL-3781","price":20.95,"currency_code":"EUR","in_stock":false},{"title":"5V 3.2A","offer_id":39354095566931,"sku":"POL-3782","price":20.95,"currency_code":"EUR","in_stock":false},{"title":"9V 2.6A","offer_id":39354095599699,"sku":"POL-3785","price":20.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/0J10033.1200.jpg?v=1622130979","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/step-down-voltage-regulator-d36v28fx","provider":"Pimoroni Ltd","version":"1.0","type":"link"}