component
A8603KESTR-R
Public Made by Adomby adom
Allegro MicroSystems, LLC AC-DC Controllers & Regulators, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "A8603KESTR-R",
"brief": "Allegro MicroSystems, LLC AC-DC Controllers & Regulators, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
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"component": {
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"manufacturer": "Allegro MicroSystems, LLC",
"package": "QFN-24-EP(4x4)",
"pin_count": 25,
"category": "Power Supply Chip",
"subcategory": "AC-DC Controllers & Regulators",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/0904906e0e74b6ffc13a33076583b7ce.pdf",
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"distributor_links": {
"lcsc": "C2650357",
"digikey": "620-1694-2-ND",
"mouser": "250-A8603KESTR-R"
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"pins": [
{
"number": "1",
"name": "VIN",
"type": "power_in",
"description": "Input supply voltage for the IC, 3 to 10 V."
},
{
"number": "2",
"name": "FAULT",
"type": "output",
"description": "Open-drain output that pulls low in case of an error condition."
},
{
"number": "3",
"name": "EN",
"type": "input",
"description": "Enable pin for the IC; the system can only be enabled after VIN is above the UVLO level."
},
{
"number": "4",
"name": "VCOM",
"type": "power_out",
"description": "Output from the internal low-dropout (LDO) regulator powered by AVDD, providing 3 to 7.5 V."
},
{
"number": "5",
"name": "GNDVCOM",
"type": "power_in",
"description": "Ground reference for VCOM; connect to the ground plane."
},
{
"number": "6",
"name": "NC",
"type": "unconnected",
"description": "No connect, reserved for test mode; connect to GND in the actual PCB."
},
{
"number": "7",
"name": "SCL",
"type": "input",
"description": "I2C clock signal generated by the master."
},
{
"number": "8",
"name": "SDA",
"type": "bidirectional",
"description": "I2C data signal, acting as an input or open-drain output depending on data direction."
},
{
"number": "9",
"name": "ADDR",
"type": "input",
"description": "I2C address selection, giving up to 4 physical IC addresses based on voltage level."
},
{
"number": "10",
"name": "FSET",
"type": "input",
"description": "Input for synchronizing the boost and charge-pump switching frequency to an external clock, or connection to an external resistor that sets the switching frequency (350 kHz to 2.25 MHz)."
},
{
"number": "11",
"name": "BIAS",
"type": "power_out",
"description": "Output from the internal 2.8 V bias regulator; decouple to GND with a 1 μF ceramic capacitor."
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{
"number": "12",
"name": "COMP",
"type": "passive",
"description": "Compensation pin for the external RZ and CZ components."
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{
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"name": "AVDD",
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"description": "Output from the internal LDO powered by VOUT."
},
{
"number": "14",
"name": "AGND",
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"description": "Analog ground reference for signals; connect to the ground plane."
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{
"number": "15",
"name": "VGL",
"type": "power_out",
"description": "Inverted charge-pump output (negative supply, 4 to -12 V)."
},
{
"number": "16",
"name": "CP22",
"type": "passive",
"description": "Capacitor terminal for the inverted charge pump."
},
{
"number": "17",
"name": "CP21",
"type": "passive",
"description": "Capacitor terminal for the inverted charge pump."
},
{
"number": "18",
"name": "VGH",
"type": "power_out",
"description": "Output of the 2× charge pump (positive supply, 14 to 29 V)."
},
{
"number": "19",
"name": "VGH3",
"type": "power_out",
"description": "Output of the 3× charge pump."
},
{
"number": "20",
"name": "CP11",
"type": "passive",
"description": "Capacitor terminal for the charge pump."
},
{
"number": "21",
"name": "CP12",
"type": "passive",
"description": "Capacitor terminal for the charge pump."
},
{
"number": "22",
"name": "VOUT",
"type": "power_in",
"description": "Connect to the boost output to supply the internal LDO and charge-pump regulators."
},
{
"number": "23",
"name": "PGND",
"type": "power_in",
"description": "Power ground for the internal boost switch; connect to the ground terminal of the output ceramic capacitor(s)."
},
{
"number": "24",
"name": "SW",
"type": "output",
"description": "Internal boost converter switch node; absolute maximum continuous voltage is -0.6 to 22 V."
},
{
"number": "25",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
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"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 Terminal List Table and the 'Package ES, 24-Pin QFN Pinouts' drawing on page 4 assign different ; The exposed thermal pad (PAD) is listed in the terminal table without a pin number, so it is not inc; The datasheet covers both the sidewall-plating (-R) and wettable-flank (-J) variants. The pinout on ",
"exposed pad 25 added from the footprint"
],
"pages_sent": 8,
"cost_usd": 0.0657,
"at": "2026-10-30T23:41:01"
},
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"Package": "QFN-24-EP(4x4)",
"Category": "Power Supply Chip",
"Pins": "25"
},
"appearance": {
"contacts": {
"quote": "ambient temperatures. It is lead (Pb) free with 100% matte-tin leadframe plating.",
"page": 1,
"doc": "ds.pdf",
"plating": "tin"
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"name": "VIN Pin Voltage",
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"max": 11,
"conditions": "All voltages measured with respect to GND",
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{
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"max": 40,
"conditions": "Voltage spikes (pulse width < 100 ns)",
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"source": "datasheet"
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{
"name": "OUT Pin Voltage",
"symbol": "VOUT",
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"min": -0.3,
"typ": null,
"max": 22,
"conditions": "",
"source_page": 3,
"source": "datasheet"
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{
"name": "AVDD Pin Voltage",
"symbol": "VAVDD",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "Upper limit: lower of 16 or VOUT + 0.3 V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "CP11 Pin Voltage",
"symbol": "VCP11",
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"min": -0.3,
"typ": null,
"max": 31,
"conditions": "Positive charge pump",
"source_page": 3,
"source": "datasheet"
},
{
"name": "CP12 Pin Voltage",
"symbol": "VCP12",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "Upper limit: VCP11 + 0.3 V; positive charge pump",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VGH and VGH3 Pin Voltage",
"symbol": "VVGH, VVGH3",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 31,
"conditions": "Positive charge pump",
"source_page": 3,
"source": "datasheet"
},
{
"name": "CP21 Pin Voltage",
"symbol": "VCP21",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 14,
"conditions": "Negative charge pump",
"source_page": 3,
"source": "datasheet"
},
{
"name": "CP22 and VGL Pin Voltage",
"symbol": "VCP22, VVGL",
"kind": "absolute_maximum",
"unit": "V",
"min": -14,
"typ": null,
"max": 0.3,
"conditions": "Negative charge pump",
"source_page": 3,
"source": "datasheet"
},
{
"name": "FAULT Pin Voltage",
"symbol": "VFAULT",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "Upper limit: lower of 10 or VVIN + 0.3 V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "BIAS, COMP, FSET Pin Voltage",
"symbol": "VBIAS, VCOMP, VFSET",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 3.3,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "VCOM Pin Voltage",
"symbol": "VVCOM",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "Upper limit: lower of 8.5 or VAVDD + 0.3 V",
"source_page": 3,
"source": "datasheet"
},
{
"name": "AGND, PGND and GNDVCOM Pin Voltage",
"symbol": "VAGND, VPGND, VGNDVCOM",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 0.3,
"conditions": "",
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"source": "datasheet"
},
{
"name": "Logic Pins (EN, SCL, SDA, ADDR, NC)",
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"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Operating Ambient Temperature",
"symbol": "TA",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "K temperature range",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Maximum Junction Temperature",
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"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Storage Temperature",
"symbol": "Tstg",
"kind": "absolute_maximum",
"unit": "°C",
"min": -55,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 3,
"source": "datasheet"
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{
"name": "Input Voltage",
"symbol": "VIN",
"kind": "recommended_operating",
"unit": "V",
"min": 3,
"typ": null,
"max": 10,
"conditions": "•",
"source_page": 6,
"source": "datasheet"
},
{
"name": "VIN Pin Undervoltage Lockout (UVLO) Threshold",
"symbol": "VUVLO",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 2.8,
"max": 2.9,
"conditions": "VIN rising •",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Shutdown BIAS Current",
"symbol": "IVINBIAS(SD)",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 1,
"max": 10,
"conditions": "Current into VIN pin, EN = low •",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switch Peak Current Limit",
"symbol": "ISWILIM",
"kind": "electrical",
"unit": "A",
"min": 2.2,
"typ": 2.6,
"max": 3,
"conditions": "Cycle-by-cycle current limit •",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switch On-Resistance",
"symbol": "RDS(on)",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": 0.4,
"max": 0.7,
"conditions": "ISW = 0.4 A",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switch Minimum On-Time",
"symbol": "tON(MIN)",
"kind": "electrical",
"unit": "ns",
"min": null,
"typ": 65,
"max": 120,
"conditions": "•",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switch Minimum Off-Time",
"symbol": "tOFF(MIN)",
"kind": "electrical",
"unit": "ns",
"min": null,
"typ": 60,
"max": 100,
"conditions": "•",
"source_page": 6,
"source": "datasheet"
},
{
"name": "VOUT Pin Leakage Current",
"symbol": "IOUT(LKG)",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 25,
"max": 37,
"conditions": "VOUT = 10 V, EN = low",
"source_page": 6,
"source": "datasheet"
},
{
"name": "SW Pin Overvoltage Protection Threshold",
"symbol": "VSW(OVP)",
"kind": "electrical",
"unit": "V",
"min": 18.6,
"typ": 21,
"max": 23,
"conditions": "Measured from SW to GND •",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Switching Frequency",
"symbol": "fSW",
"kind": "electrical",
"unit": "MHz",
"min": 1.8,
"typ": 2,
"max": 2.2,
"conditions": "RFSET_SYNC = 5.1 kΩ •",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Synchronization Frequency",
"symbol": "fSYNC",
"kind": "electrical",
"unit": "MHz",
"min": 0.35,
"typ": null,
"max": 2.25,
"conditions": "External logic signal connected to FSET_SYNC pin •",
"source_page": 6,
"source": "datasheet"
},
{
"name": "EN Pin Logic High",
"symbol": "VIH_EN",
"kind": "electrical",
"unit": "V",
"min": 1.8,
"typ": null,
"max": null,
"conditions": "•",
"source_page": 7,
"source": "datasheet"
},
{
"name": "EN Pin Logic Low",
"symbol": "VIL_EN",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.8,
"conditions": "•",
"source_page": 7,
"source": "datasheet"
},
{
"name": "FSET Pin Input Logic High",
"symbol": "VIH_FSE",
"kind": "electrical",
"unit": "V",
"min": 1.5,
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