component
TPS65321AQPWPRQ1
Public Made by Adomby adom
Texas Instruments Linear Voltage Regulators (LDO), TSSOP-14-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"brief": "Texas Instruments Linear Voltage Regulators (LDO), TSSOP-14-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"package": "TSSOP-14-EP",
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"category": "Power Supply Chip",
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"digikey": "296-52051-2-ND",
"mouser": "595-TPS65321AQPWPRQ1"
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"pins": [
{
"number": "1",
"name": "BOOT",
"type": "passive",
"description": "Bootstrap capacitor is required between BOOT and SW to supply the bias voltage for the integrated high-side MOSFET (abs max 46 V, BOOT-SW 8 V)."
},
{
"number": "2",
"name": "VIN",
"type": "power_in",
"description": "Input supply pin for the internal biasing and high-side MOSFET of the buck regulator, 3.6 V to 36 V input range (abs max 40 V)."
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{
"number": "3",
"name": "VIN_LDO",
"type": "power_in",
"description": "Input supply pin for the LDO regulator, 3 V to 36 V input range (abs max 40 V)."
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{
"number": "4",
"name": "LDO_OUT",
"type": "power_out",
"description": "LDO regulator output, 280 mA capability, adjustable 1.1 V to 5.5 V (abs max 7 V)."
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{
"number": "5",
"name": "FB2",
"type": "input",
"description": "Feedback pin of the LDO regulator; connect an external resistive divider between LDO_OUT, FB2 and GND to set the LDO output voltage."
},
{
"number": "6",
"name": "nRST",
"type": "output",
"description": "Active-low open-drain reset output of the buck regulator; connect to an external bias voltage through a resistor, asserted high after the buck begins regulating."
},
{
"number": "7",
"name": "EN2",
"type": "input",
"description": "Enable input for the LDO regulator, high-voltage tolerant and internally pulled to ground; pull up externally to enable."
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{
"number": "8",
"name": "EN1",
"type": "input",
"description": "Enable input for the buck regulator, high-voltage tolerant and internally pulled to ground; pull up externally to enable."
},
{
"number": "9",
"name": "RT/CLK",
"type": "input",
"description": "Connect an external resistor to ground to program the buck switching frequency, or feed an external clock as the switching frequency reference."
},
{
"number": "10",
"name": "SS",
"type": "input",
"description": "Connect an external capacitor to ground to set the soft-start time of the buck regulator."
},
{
"number": "11",
"name": "FB1",
"type": "input",
"description": "Feedback pin of the buck regulator; connect an external resistive divider from the buck output to GND to set the output voltage."
},
{
"number": "12",
"name": "COMP",
"type": "output",
"description": "Error-amplifier output of the buck regulator and input to the output switch-current comparator; connect frequency-compensation components here."
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{
"number": "13",
"name": "GND",
"type": "power_in",
"description": "Ground pin."
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{
"number": "14",
"name": "SW",
"type": "output",
"description": "Source node of the internal high-side MOSFET of the buck regulator (abs max 40 V)."
},
{
"number": "15",
"name": "PowerPAD",
"type": "power_in",
"description": "Exposed thermal pad; electrically connect to ground and solder to the PCB ground plane for thermal performance."
}
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"exposed pad 15 added from the footprint"
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"at": "2026-10-20T10:55:24"
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"metadata": {
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"Package": "TSSOP-14-EP",
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"rows": [
{
"name": "VIN supply input voltage",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 40,
"conditions": "",
"source_page": 4,
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{
"name": "VIN_LDO supply input voltage",
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{
"name": "Control pins EN1, EN2",
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"name": "Buck switch node SW",
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"kind": "absolute_maximum",
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"min": -0.3,
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{
"name": "Buck BOOT pin",
"symbol": "BOOT",
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"unit": "V",
"min": -0.3,
"typ": null,
"max": 46,
"conditions": "",
"source_page": 4,
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{
"name": "Buck BOOT-SW voltage",
"symbol": "BOOT-SW",
"kind": "absolute_maximum",
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"min": null,
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"source_page": 4,
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{
"name": "Buck error amplifier output COMP",
"symbol": "COMP",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 3.6,
"conditions": "",
"source_page": 4,
"source": "datasheet"
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{
"name": "Buck soft-start pin SS",
"symbol": "SS",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 3.6,
"conditions": "",
"source_page": 4,
"source": "datasheet"
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{
"name": "Buck RT/CLK pin",
"symbol": "RT/CLK",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 3.6,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Reset output nRST",
"symbol": "nRST",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 4,
"source": "datasheet"
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{
"name": "LDO output LDO_OUT",
"symbol": "LDO_OUT",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "LDO feedback pin FB2",
"symbol": "FB2",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 7,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Operating ambient temperature",
"symbol": "TA",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 4,
"source": "datasheet"
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{
"name": "Operating junction temperature",
"symbol": "TJ",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 4,
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{
"name": "Storage temperature",
"symbol": "Tstg",
"kind": "absolute_maximum",
"unit": "°C",
"min": -55,
"typ": null,
"max": 165,
"conditions": "",
"source_page": 4,
"source": "datasheet"
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{
"name": "Supply input VIN (recommended)",
"symbol": "VIN",
"kind": "recommended_operating",
"unit": "V",
"min": 3.6,
"typ": null,
"max": 36,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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{
"name": "Supply input VIN_LDO (recommended)",
"symbol": "VIN_LDO",
"kind": "recommended_operating",
"unit": "V",
"min": 3,
"typ": null,
"max": 36,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Buck BOOT pin (recommended)",
"symbol": "BOOT",
"kind": "recommended_operating",
"unit": "V",
"min": 3.6,
"typ": null,
"max": 42,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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{
"name": "Buck switch node SW1 (recommended)",
"symbol": "SW1",
"kind": "recommended_operating",
"unit": "V",
"min": -1,
"typ": null,
"max": 36,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Buck feedback FB1 (recommended)",
"symbol": "FB1",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 0.8,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Buck soft-start SS (recommended)",
"symbol": "SS",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 3,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Buck COMP (recommended)",
"symbol": "COMP",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 3,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Buck RT/CLK (recommended)",
"symbol": "RT/CLK",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 3,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Reset output nRST (recommended)",
"symbol": "nRST",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 5.25,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "LDO output LDO_OUT (recommended)",
"symbol": "LDO_OUT",
"kind": "recommended_operating",
"unit": "V",
"min": 1.1,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "LDO feedback FB2 (recommended)",
"symbol": "FB2",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 0.8,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Enable EN1 (recommended)",
"symbol": "EN1",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 36,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Enable EN2 (recommended)",
"symbol": "EN2",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 36,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Operating junction temperature range (recommended)",
"symbol": "TJ",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Operating input voltage",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 3.6,
"typ": 12,
"max": 36,
"conditions": "Normal mode, after initial start-up",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Shutdown supply current",
"symbol": "",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": 2,
"max": 7,
"conditions": "V(EN1) = V(EN2) = 0 V, 25°C",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Enable low level",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.7,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Enable high level",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 2.5,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Internal UVLO falling threshold",
"symbol": "V(VIN)(f)",
"kind": "electrical",
"unit": "V",
"min": 1.8,
"typ": 2.6,
"max": 3,
"conditions": "Ramp V(VIN) down until output turns OFF",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Internal UVLO rising threshold",
"symbol": "V(VIN)(r)",
"kind": "electrical",
"unit": "V",
"min": 2.2,
"typ": 2.8,
"max": 3.2,
"conditions": "Ramp V(VIN) up until output turns ON",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Operating non-switching supply current (buck)",
"symbol": "I(Qon)",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": 110,
"max": 140,
"conditions": "Measured at the VIN pin, V(FB1) = 0.83 V, V(VIN) = 12 V, 25°C",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Buck voltage reference for FB1",
"symbol": "V(ref1)",
"kind": "electrical",
"unit": "V",
"min": 0.788,
"typ": 0.8,
"max": 0.812,
"conditions": "Buck regulator output: 1.1 V to 20 V. Buck regulator in Continuous Conducting Mode without Pulse-Skipping",
"source_page": 6,
"source": "datasheet"
},
{
"name": "DC output voltage accuracy",
"symbol": "",
"kind": "tolerance",
"unit": "%",
"min": -2,
"typ": null,
"max": 2,
"conditions": "Includes voltage references, DC load and line regulation, process and temperature",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Buck high-side MOSFET on-resistance",
"symbol": "r(DS(on) HS FET)",
"kind": "electrical",
"unit": "mΩ",
"min": null,
"typ": 127,
"max": 250,
"conditions": "V(VIN) = 12 V, V(SW) = 6 V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Buck current-limit threshold",
"symbol": "",
"kind": "electrical",
"unit": "A",
"min": 4,
"typ": null,
"max": 6,
"conditions": "V(VIN) = 12 V, TJ = 25°C",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Buck switching frequency range (RT mode)",
"symbol": "ƒS",
"kind": "electrical",
"unit": "kHz",
"min": 100,
"typ": null,
"max": 2500,
"conditions": "Under RT mode",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Buck switching frequency (fixed-frequency PWM, 200 kΩ RT)",
"symbol": "ƒS",
"kind": "electrical",
"unit": "kHz",
"min": 523,
"typ": 585,
"max": 640,
"conditions": "Under fixed-frequency PWM mode, with 200 kΩ connected between RT/CLK and GND pins",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Buck switching frequency range (CLK mode)",
"symbol": "ƒS",
"kind": "electrical",
"unit": "kHz",
"min": 300,
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