component
HT27403ARQZ
Public Made by Adomby adom
HTCSEMI DC-DC Converters, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"type": "component",
"slug": "ht27403arqz",
"title": "HT27403ARQZ",
"brief": "HTCSEMI DC-DC Converters, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
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"ht27403arqz",
"factory-2.0.0",
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"mpn": "HT27403ARQZ",
"manufacturer": "HTCSEMI",
"package": "QFN-24-EP(4x4)",
"pin_count": 25,
"category": "Power Management (PMIC)",
"subcategory": "DC-DC Converters",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/6f7cb78bdaec8985ca1d1fb4318ce6ea.pdf",
"parts": {
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"footprint": "ht27403arqz.kicad_mod",
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"model_3d_step": "ht27403arqz-etched.step",
"model_3d_step_plain": "ht27403arqz.step",
"lbr": "ht27403arqz.lbr"
},
"distributor_links": {
"lcsc": "C47326432"
},
"distributor_check": {
"checked_at": "2026-10-18T07:51:14Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
},
"mouser": {
"pn": null,
"status": "quota"
}
},
"pins": [
{
"number": "1",
"name": "SS/TRACK",
"type": "bidirectional",
"description": "Soft-start or tracking input: a 3-µA source charges the capacitor to GND until the reference reaches 0.6 V, and the pin can also be driven by an external voltage source for tracking."
},
{
"number": "2",
"name": "RS",
"type": "input",
"description": "Negative remote sense input that removes the voltage drop between GND and the local ground at the load, with an RC filter to GND in noisy environments and RS-to-GND connection at the IC if unused; RS pin voltage is limited to -0.1 V to 0.1 V."
},
{
"number": "3",
"name": "FB",
"type": "input",
"description": "Voltage-mode error-amplifier inverting input that sets the output voltage, held at 0.6 V ±1% in closed-loop regulation."
},
{
"number": "4",
"name": "COMP",
"type": "output",
"description": "Error-amplifier output that is connected to FB through a compensation network to ensure loop stability."
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{
"number": "5",
"name": "FADJ",
"type": "input",
"description": "Frequency adjust input: a resistor between this pin and GND sets the switching frequency, programmable from 200 kHz to 1.2 MHz."
},
{
"number": "6",
"name": "SYNC",
"type": "input",
"description": "Synchronization input for PLL locking to an external clock; the frequency defaults to the FADJ setting when no SYNC signal is present, the pin voltage is rated 0 V to 5.5 V, and it should be tied to GND if not used."
},
{
"number": "7",
"name": "UVLO/EN",
"type": "input",
"description": "Precision UVLO/enable input with a 1.15 V rising enable threshold, a 0.985 V falling threshold, and a 1.8 µA initial pullup; the pin voltage is rated 0 V to min(VIN, 5.5 V)."
},
{
"number": "8",
"name": "OTP",
"type": "input",
"description": "Overtemperature protection setpoint pin: a resistor and 0.1-µF capacitor to GND set the OTP threshold, and it should be connected to GND if system-level OTP is not required."
},
{
"number": "9",
"name": "D+",
"type": "input",
"description": "External temperature sense input for a 2N3904-type NPN remote thermal diode (base and collector shorted), used for inductor DCR drift compensation and system thermal shutdown."
},
{
"number": "10",
"name": "D-",
"type": "input",
"description": "Return path for the external thermal diode, routed as a differential pair with D+ and connected to GND."
},
{
"number": "11",
"name": "PGOOD",
"type": "output",
"description": "Open-drain power-good output that goes low during fault or unregulated conditions and requires an external pullup to VDD or an external rail; it has a 20-µs deglitch filter and must not exceed 5.5 V."
},
{
"number": "12",
"name": "VIN",
"type": "power_in",
"description": "Input voltage rail (3.0 V to 20 V recommended) that provides PWM feedforward and the internal bias supply, to be decoupled locally with a 1-µF ceramic capacitor."
},
{
"number": "13",
"name": "GND",
"type": "power_in",
"description": "Common ground for power and signal return, including the low-side MOSFET gate return, soft-start capacitor, OTP resistor, and frequency-adjust resistor."
},
{
"number": "14",
"name": "VDD",
"type": "power_out",
"description": "Subregulated 4.7 V internal bias rail (recommended 2.6 V to 5.5 V) for gate drive and CBOOT, to be decoupled with a 10-µF ceramic capacitor and not used to drive auxiliary loads."
},
{
"number": "15",
"name": "LG",
"type": "output",
"description": "Low-side N-FET gate drive output."
},
{
"number": "16",
"name": "SW",
"type": "passive",
"description": "Power-stage switch-node connection that also serves as the high-side gate driver return; recommended SW pin voltage is -0.3 V to 20 V."
},
{
"number": "17",
"name": "HG",
"type": "output",
"description": "High-side N-FET gate drive output."
},
{
"number": "18",
"name": "CBOOT",
"type": "power_out",
"description": "High-side bootstrap supply for the high-side gate driver, to be connected to SW through a 100-nF ceramic capacitor."
},
{
"number": "19",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet specifies to connect this pin directly to GND."
},
{
"number": "20",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet specifies to connect this pin directly to GND."
},
{
"number": "21",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet specifies to connect this pin directly to GND."
},
{
"number": "22",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet specifies to connect this pin directly to GND."
},
{
"number": "23",
"name": "CS+",
"type": "input",
"description": "Noninverting input to the current-sense comparator for DCR-based overcurrent sensing; the CS+ to CS- differential is limited to ±1 V."
},
{
"number": "24",
"name": "CS-",
"type": "input",
"description": "Inverting input to the current-sense comparator, providing 9.9 µA of nominal offset current at room temperature to adjust the current-limit setpoint."
},
{
"number": "25",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
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"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The exposed pad is not a numbered pin and the datasheet does not explicitly assign it to GND; it is ; Pins 19-22 are listed as NC in one table row. They are typed unconnected per KiCad, but the datashee; SW is listed as P (power) in the datasheet; typed passive here as a switch node. Adjust if your ERC ",
"exposed pad 25 added from the footprint",
"dropped thermal pad ['EP'] absent from footprint",
"1/25 pins cited to the wrong page (name found elsewhere): ['21:NC@p3']"
],
"pages_sent": 4,
"cost_usd": 0.0546,
"at": "2026-10-18T07:50:21"
},
"datasheet": {
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"sha256": "c1eb0b3a75c57ec6",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 25,
"cites_pages": true,
"refuses_to_fabricate": true
}
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"metadata": {
"specs": {
"Manufacturer": "HTCSEMI",
"Package": "QFN-24-EP(4x4)",
"Category": "Power Management (PMIC)",
"Pins": "25"
},
"characteristics": {
"version": 1,
"source": "datasheet",
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{
"name": "Input voltage VIN, CS+, CS–, SW (absolute maximum)",
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{
"name": "SS/TRACK, SYNC, FADJ, COMP, FB, RS voltage (absolute maximum)",
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"unit": "V",
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"typ": null,
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"conditions": "max printed as VVDD + 0.3 V",
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{
"name": "UVLO/EN voltage (absolute maximum)",
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"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "max printed as min(VVIN + 0.3, 6) V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "CBOOT voltage (absolute maximum)",
"symbol": "CBOOT",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 24,
"conditions": "",
"source_page": 4,
"source": "datasheet"
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{
"name": "CBOOT to SW voltage (absolute maximum)",
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{
"name": "CS+ to CS– voltage (absolute maximum)",
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"min": -1,
"typ": null,
"max": 1,
"conditions": "",
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"source": "datasheet"
},
{
"name": "OTP, D+, D– voltage (absolute maximum)",
"symbol": "OTP, D+, D–",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "max printed as VVDD V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Operating junction temperature (absolute maximum)",
"symbol": "TJ",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Storage temperature range (handling rating)",
"symbol": "Tstg",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "ESD human body model (handling rating)",
"symbol": "V(ESD) HBM",
"kind": "absolute_maximum",
"unit": "kV",
"min": -2,
"typ": null,
"max": 2,
"conditions": "per ANSI/ESDA/JEDEC JS-001, all pins",
"source_page": 4,
"source": "datasheet"
},
{
"name": "ESD charged device model (handling rating)",
"symbol": "V(ESD) CDM",
"kind": "absolute_maximum",
"unit": "V",
"min": -500,
"typ": null,
"max": 500,
"conditions": "per JEDEC JESD22-C101, all pins",
"source_page": 4,
"source": "datasheet"
},
{
"name": "VIN input voltage with VIN tied to VDD (recommended)",
"symbol": "VIN",
"kind": "recommended_operating",
"unit": "V",
"min": 3,
"typ": null,
"max": 5.5,
"conditions": "VIN tied to VDD",
"source_page": 4,
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{
"name": "VIN input voltage (recommended)",
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"min": 3,
"typ": null,
"max": 20,
"conditions": "",
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{
"name": "SW pin voltage (recommended)",
"symbol": "SW",
"kind": "recommended_operating",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 20,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "VDD pin voltage (recommended)",
"symbol": "VDD",
"kind": "recommended_operating",
"unit": "V",
"min": 2.6,
"typ": 4.7,
"max": 5.5,
"conditions": "",
"source_page": 4,
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},
{
"name": "PGOOD pin voltage (recommended)",
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"kind": "recommended_operating",
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"min": 0,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "UVLO/EN pin voltage (recommended)",
"symbol": "UVLO/EN",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": null,
"conditions": "max printed as min(VVIN, 5.5) V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "SS/TRACK pin voltage (recommended)",
"symbol": "SS/TRACK",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": null,
"conditions": "max printed as VVDD V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "SYNC pin voltage (recommended)",
"symbol": "SYNC",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "RS pin voltage (recommended)",
"symbol": "RS",
"kind": "recommended_operating",
"unit": "V",
"min": -0.1,
"typ": null,
"max": 0.1,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Operating junction temperature (recommended)",
"symbol": "TJ",
"kind": "recommended_operating",
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"min": -40,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Operating free-air temperature (recommended)",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Junction-to-ambient thermal resistance",
"symbol": "θJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 32.7,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Junction-to-case (top) thermal resistance",
"symbol": "θJCtop",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 31.2,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Junction-to-board thermal resistance",
"symbol": "θJB",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 11.2,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Junction-to-top characterization parameter",
"symbol": "ψJT",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 0.2,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Junction-to-board characterization parameter",
"symbol": "ψJB",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 11.2,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Junction-to-case (bottom) thermal resistance",
"symbol": "θJCbot",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 1.4,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Quiescent current (two printed values, column not shown)",
"symbol": "IQ",
"kind": "electrical",
"unit": "mA",
"min": 3.5,
"typ": null,
"max": 5,
"conditions": "VFB = 0.6 V (not switching)",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Shutdown quiescent current (two printed values, column not shown)",
"symbol": "IQ-SD",
"kind": "electrical",
"unit": "µA",
"min": 25,
"typ": null,
"max": 45,
"conditions": "VUVLO/EN = 0 V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "FB pin voltage accuracy",
"symbol": "VFB",
"kind": "electrical",
"unit": "mV",
"min": 594,
"typ": 600,
"max": 606,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "FB pin bias current",
"symbol": "IFB",
"kind": "electrical",
"unit": "nA",
"min": -165,
"typ": 0,
"max": 165,
"conditions": "VFB = 0.65 V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Input undervoltage lockout",
"symbol": "UVLO",
"kind": "electrical",
"unit": "V",
"min": 2.6,
"typ": 2.7,
"max": 2.8,
"conditions": "VVIN rising, VVDD rising",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Switching frequency",
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