component
MAX17634CATP+T
Public Made by Adomby adom
Analog Devices Inc Maxim Integrated DC-DC Converters, TQFN-20(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"package": "TQFN-20(4x4)",
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"name": "PGND",
"type": "power_in",
"description": "Power ground pin of the converter that must be connected externally to the power ground plane."
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{
"number": "2",
"name": "IN",
"type": "power_in",
"description": "Power-supply input pin with a 4.5V to 36V input supply range, to be decoupled to PGND with a minimum of 4.7µF placed close to the IN and PGND pins."
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"number": "3",
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"type": "power_in",
"description": "Power-supply input pin with a 4.5V to 36V input supply range, to be decoupled to PGND with a minimum of 4.7µF placed close to the IN and PGND pins."
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{
"number": "4",
"name": "EN/UVLO",
"type": "input",
"description": "Enable/undervoltage-lockout pin that enables the output when driven above VENR, disables the device when pulled below VENF, and sets the turn-on input voltage through a resistor divider between IN and SGND."
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{
"number": "5",
"name": "RESET",
"type": "output",
"description": "Open-drain reset output that is driven low when FB drops below 92% of its set value and goes high 1024 cycles after FB rises above 95% of its set value."
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{
"number": "6",
"name": "INTVCC",
"type": "power_out",
"description": "5V LDO output that must be bypassed to SGND with a 2.2µF ceramic capacitor, and the LDO does not support external loading."
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{
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"description": "Analog ground pin of the device, which the exposed pad must be connected to."
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"name": "SS",
"type": "passive",
"description": "Soft-start input where a capacitor connected from SS to SGND sets the soft-start time."
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{
"number": "9",
"name": "FB",
"type": "input",
"description": "Feedback input that connects to VOUT for the MAX17634A and MAX17634B, or to the center of an external resistor divider from the output to SGND for the MAX17634C."
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{
"number": "10",
"name": "RT",
"type": "input",
"description": "Programmable switching-frequency input where a resistor from RT to SGND sets the frequency between 400kHz and 2.2MHz, and leaving RT open selects the default 500kHz."
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"number": "11",
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"description": "Mode-selection pin that selects PWM operation when connected to SGND, DCM when connected to INTVCC, and PFM when left open, and that can also accept an external clock for synchronization."
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"number": "12",
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"type": "power_in",
"description": "External power supply input that reduces internal LDO loss and should be connected to the buck output only when programmed to 5V, otherwise connected to SGND."
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{
"number": "13",
"name": "NC",
"type": "unconnected",
"description": "No connection."
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{
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"description": "Power-supply input pin with a 4.5V to 36V input supply range, to be decoupled to PGND with a minimum of 4.7µF placed close to the IN and PGND pins."
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{
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{
"number": "17",
"name": "LX",
"type": "output",
"description": "Switching node pin that connects to the switching side of the inductor."
},
{
"number": "18",
"name": "LX",
"type": "output",
"description": "Switching node pin that connects to the switching side of the inductor."
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{
"number": "19",
"name": "LX",
"type": "output",
"description": "Switching node pin that connects to the switching side of the inductor."
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{
"number": "20",
"name": "BST",
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"description": "Boost flying capacitor pin where a 0.1µF ceramic capacitor is connected between BST and LX."
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{
"number": "21",
"name": "EP",
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"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
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"exposed pad 21 added from the footprint",
"dropped thermal pad ['EP'] absent from footprint"
],
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"at": "2026-10-20T21:24:15"
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{
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"min": 4.5,
"typ": null,
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{
"name": "Input Shutdown Current",
"symbol": "IIN-SH",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": 2.8,
"max": 4.5,
"conditions": "VEN/UVLO = 0V (Shutdown mode)",
"source_page": 3,
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{
"name": "Input Quiescent Current, DCM Mode",
"symbol": "IQ_DCM",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 1.2,
"max": 1.8,
"conditions": "DCM Mode, VLX = 0.1V",
"source_page": 3,
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{
"name": "EN Threshold rising",
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"kind": "electrical",
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"min": 1.19,
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"min": 1.068,
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{
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"conditions": "VEN/UVLO = 0V, TA = +25°C",
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{
"name": "INTVCC Output Voltage Range",
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"conditions": "VINTVCC = 4.5V, VIN = 7.5V",
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{
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"min": 4.3,
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{
"name": "High-Side nMOS On-Resistance",
"symbol": "RDS-ONH",
"kind": "electrical",
"unit": "mΩ",
"min": null,
"typ": 60,
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"conditions": "ILX = 0.3A, sourcing",
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{
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{
"name": "LX Leakage Current",
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"unit": "μA",
"min": -2,
"typ": null,
"max": 3,
"conditions": "VLX = (VPGND+1) V to (VIN -1) V, TA = +25°C",
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{
"name": "Soft-Start Charging Current",
"symbol": "ISS",
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"min": 4.7,
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{
"name": "FB Regulation Voltage (MAX17634C)",
"symbol": "VFB-REG",
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"unit": "V",
"min": 0.888,
"typ": 0.9,
"max": 0.912,
"conditions": "MODE/SYNC = SGND or MODE/SYNC = INTVCC, for MAX17634C",
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{
"name": "FB Regulation Voltage (MAX17634C)",
"symbol": "VFB-REG",
"kind": "electrical",
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"min": 0.889,
"typ": 0.915,
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{
"name": "FB Input Bias Current (MAX17634C)",
"symbol": "IFB",
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"conditions": "For MAX17634C, TA = +25°C",
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},
{
"name": "MODE Threshold PWM",
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"conditions": "MODE/SYNC = SGND (PWM mode)",
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{
"name": "SYNC Frequency Capture Range",
"symbol": "FSYNC",
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"unit": "x fSW",
"min": 1.1,
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{
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{
"name": "SYNC Threshold VIH",
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{
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