component
RT6543AGQW
Public Made by Adomby adom
Richtek Tech AC-DC Controllers And Regulators, QFN-20-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"title": "RT6543AGQW",
"brief": "Richtek Tech AC-DC Controllers And Regulators, QFN-20-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"rt6543agqw",
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"manufacturer": "Richtek Tech",
"package": "QFN-20-EP(3x3)",
"pin_count": 21,
"category": "Power Management (PMIC)",
"subcategory": "AC-DC Controllers And Regulators",
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"distributor_links": {
"lcsc": "C3249953"
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"distributor_check": {
"checked_at": "2026-10-17T18:42:15Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
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"mouser": {
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},
"pins": [
{
"number": "1",
"name": "CS_DIS",
"type": "passive",
"description": "Current-limit setting pin: a resistor from CS to AGND sets the overcurrent limit, with a 6A typical CS source current at TA = 25°C and VCS limited to 0.5V to 2.8V over the operating temperature range."
},
{
"number": "2",
"name": "ISENSEP",
"type": "input",
"description": "Positive input for buck current sensing, shorted to ISENSEN for a zero load-line setting."
},
{
"number": "3",
"name": "ISENSEN",
"type": "input",
"description": "Negative input for buck current sensing, shorted to ISENSEP for a zero load-line setting."
},
{
"number": "4",
"name": "PGOOD",
"type": "output",
"description": "Open-drain power-good output for VCCIN_AUX that is pulled low during UVP, OVP, OTP, EN low, or when the output is not regulated, and requires an external pull-up of 10k to 100k."
},
{
"number": "5",
"name": "COMP",
"type": "passive",
"description": "Internal error amplifier output used for loop compensation."
},
{
"number": "6",
"name": "FB",
"type": "input",
"description": "Internal error amplifier input used for loop compensation."
},
{
"number": "7",
"name": "RGND",
"type": "power_in",
"description": "Return ground for VCCIN_AUX from the CPU side."
},
{
"number": "8",
"name": "VOUT",
"type": "input",
"description": "VCCIN_AUX feedback input used for AUX output regulation."
},
{
"number": "9",
"name": "FSWSEL",
"type": "input",
"description": "Switching-frequency setting pin: tie high to VCC, leave floating for the 600kHz default, or tie low to GND, and keep FSWSEL to VCC below 0.5V at all times."
},
{
"number": "10",
"name": "BOOT",
"type": "power_out",
"description": "Bootstrap capacitor node, charged through the low-side MOSFET conduction, that connects through a capacitor to PH to supply the high-side gate driver."
},
{
"number": "11",
"name": "UGATE",
"type": "output",
"description": "High-side gate driver output with sink and source capability, to be connected to the high-side MOSFET gate by a short, low-inductance path."
},
{
"number": "12",
"name": "PH",
"type": "passive",
"description": "AUX switch node connected to the power inductor and to the BOOT capacitor return; this noisy node must be kept away from sensitive traces."
},
{
"number": "13",
"name": "LGATE",
"type": "output",
"description": "Low-side gate driver output that must not have a series resistor to the low-side MOSFET gate, since LGATE is monitored for shoot-through protection."
},
{
"number": "14",
"name": "PGND",
"type": "power_in",
"description": "Power ground, connected to AGND at only one point through a short trace to reduce circulating currents."
},
{
"number": "15",
"name": "PVCC",
"type": "power_in",
"description": "Gate driver bias input with a 5V typical requirement that must be stable and filtered by an RC network (R = 2.2 and C = 1 F, 0603) placed as close as possible to the pin."
},
{
"number": "16",
"name": "VCC",
"type": "power_in",
"description": "Control logic bias input with a 5V typical requirement that must be stable and filtered by an RC network (R = 2.2 and C = 1 F, 0603) placed as close as possible to the pin."
},
{
"number": "17",
"name": "VID1",
"type": "input",
"description": "VID control input that, together with VID0, sets the VCCIN_AUX output to 0V, 1.1V, 1.65V, or 1.8V."
},
{
"number": "18",
"name": "VID0",
"type": "input",
"description": "VID control input that, together with VID1, sets the VCCIN_AUX output to 0V, 1.1V, 1.65V, or 1.8V."
},
{
"number": "19",
"name": "EN",
"type": "input",
"description": "Enable input: below 0.3V puts the controller in shutdown with all power rails disabled, and above 1V wakes the controller."
},
{
"number": "20",
"name": "VSYS",
"type": "input",
"description": "System voltage sense input connected to the input voltage for UVLO monitoring and on-time setting, with an RC filter (R = 2.2 and C = 0.1 F, 0603) recommended to prevent noise disturbing the on-time."
},
{
"number": "21",
"name": "GND",
"type": "power_in",
"description": "Electrically isolated exposed pad that must be soldered to the large PGND plane with thermal vias to reduce thermal resistance."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"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: Package mapping: the hint says QFN-20-EP(3x3), but the datasheet names this part's package WQFN-20L ; Pin 1 name conflict: the pin table and block diagram label pin 1 'CS_DIS', but its function text des; Extraction lost symbols. The FSWSEL-to-VCC condition is printed as 'FSWSEL VCC < 0.5V' with the oper"
],
"pages_sent": 4,
"cost_usd": 0.0502,
"at": "2026-10-17T18:37:45"
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"pages": 21,
"sha256": "e77ca1eb744bcf71",
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"cad": "KiCad official (CC-BY-SA 4.0)",
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},
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"metadata": {
"specs": {
"Manufacturer": "Richtek Tech",
"Package": "QFN-20-EP(3x3)",
"Category": "Power Management (PMIC)",
"Pins": "21"
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"rows": [
{
"name": "VCC Input Voltage (recommended operating)",
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"max": 5.5,
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"name": "VSYS Input Voltage (recommended operating)",
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{
"name": "Junction Temperature Range (recommended operating)",
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"name": "VCC to PGND (absolute maximum)",
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{
"name": "RGND to PGND (absolute maximum)",
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"name": "BOOT to PH (absolute maximum)",
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"min": -2,
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{
"name": "BOOT to PGND (absolute maximum)",
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"name": "BOOT to PGND (absolute maximum)",
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"min": -10,
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{
"name": "LGATE to PGND (absolute maximum)",
"symbol": "VLGATE",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6.8,
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{
"name": "LGATE to PGND (absolute maximum)",
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{
"name": "PH to PGND (absolute maximum)",
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"conditions": "DC",
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{
"name": "PH to PGND (absolute maximum)",
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{
"name": "UGATE to PGND (absolute maximum)",
"symbol": "VUGATE",
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"min": -0.3,
"typ": null,
"max": 36.8,
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{
"name": "UGATE to PGND (absolute maximum)",
"symbol": "VUGATE",
"kind": "absolute_maximum",
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"min": -10,
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"max": 41.8,
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{
"name": "Other pins (absolute maximum)",
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{
"name": "Power Dissipation PD at TA = 25°C",
"symbol": "PD",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 3.33,
"conditions": "TA = 25°C, WQFN-20L 3x3",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Package Thermal Resistance junction-to-ambient",
"symbol": "θJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 30,
"max": null,
"conditions": "WQFN-20L 3x3",
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{
"name": "Package Thermal Resistance junction-to-case",
"symbol": "θJC",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 7.5,
"max": null,
"conditions": "WQFN-20L 3x3",
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{
"name": "Junction Temperature (absolute maximum)",
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"unit": "°C",
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{
"name": "Lead Temperature (soldering)",
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"typ": null,
"max": 260,
"conditions": "Soldering, 10 sec.",
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{
"name": "Storage Temperature Range",
"symbol": "TSTG",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
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{
"name": "ESD Susceptibility HBM",
"symbol": "",
"kind": "absolute_maximum",
"unit": "kV",
"min": null,
"typ": null,
"max": 2,
"conditions": "Human Body Model",
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},
{
"name": "Supply Voltage VCC",
"symbol": "VCC",
"kind": "electrical",
"unit": "V",
"min": 4.5,
"typ": 5,
"max": 5.5,
"conditions": "",
"source_page": 6,
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{
"name": "Supply Current IVCC",
"symbol": "IVCC",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 0.3,
"max": 0.55,
"conditions": "VEN = 5V, no switching",
"source_page": 6,
"source": "datasheet"
},
{
"name": "VCC POR Threshold",
"symbol": "VCC_POR",
"kind": "electrical",
"unit": "V",
"min": 4,
"typ": 4.2,
"max": 4.4,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "VCC UVLO Threshold",
"symbol": "VVCC_UVLO",
"kind": "electrical",
"unit": "V",
"min": 3.7,
"typ": 3.9,
"max": 4.1,
"conditions": "",
"source_page": 6,
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},
{
"name": "VID0/VID1 Input Low Voltage",
"symbol": "VID_IL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.3,
"conditions": "Falling edge, VCC = 5V",
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},
{
"name": "VID0/VID1 Input High Voltage",
"symbol": "VID_IH",
"kind": "electrical",
"unit": "V",
"min": 1,
"typ": null,
"max": null,
"conditions": "Rising edge, VCC = 5V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "EN Input Low Voltage",
"symbol": "VEN_IL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.3,
"conditions": "Falling edge, VCC = 5V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "EN Input High Voltage",
"symbol": "VEN_IH",
"kind": "electrical",
"unit": "V",
"min": 1,
"typ": null,
"max": null,
"conditions": "Rising edge, VCC = 5V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "FSWSEL Input High Level",
"symbol": "VFSWSEL_H",
"kind": "electrical",
"unit": "V",
"min": 4.5,
"typ": null,
"max": null,
"conditions": "Rising edge, VCC = 5V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "FSWSEL Input Low Level",
"symbol": "VFSWSEL_L",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.4,
"conditions": "Falling edge, VCC = 5V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "FSWSEL Input Floating Level",
"symbol": "VFSWSEL_HIZ",
"kind": "electrical",
"unit": "V",
"min": 2,
"typ": 2.5,
"max": 3,
"conditions": "Floating, VCC = 5V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "PGOOD High Threshold",
"symbol": "VPGOOD_IH",
"kind": "electrical",
"unit": "%VOUT",
"min": 86,
"typ": 90,
"max": 94,
"conditions": "Rising edge",
"source_page": 7,
"source": "datasheet"
},
{
"name": "PGOOD Low Threshold",
"symbol": "VPGOOD_IL",
"kind": "electrical",
"unit": "%VOUT",
"min": 80,
"typ": 84,
"max": 88,
"conditions": "Falling edge",
"source_page": 7,
"source": "datasheet"
},
{
"name": "PGOOD Leakage Current",
"symbol": "ILK_PGOOD",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 1,
"conditions": "High state, VPGOOD = 5V",
"source_page": 7,
"source": "datasheet"
},
{
"name": "PGOOD Output Low Voltage",
"symbol": "VPGOOD_LOW",
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