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TPS7A8901RTJT
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Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+58@@ -0,0 +1,58 @@+# TPS7A8901RTJT++**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · QFN-20-EP(4x4)++TPS7A8901RTJT from Texas Instruments, in a QFN-20-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | IN1 | power_in | Input supply pin for LDO 1; a 10 µF or greater input capacitor is required, placed as close to the input as possible. |+| 2 | IN1 | power_in | Input supply pin for LDO 1; a 10 µF or greater input capacitor is required, placed as close to the input as possible. |+| 3 | GND | power_in | Ground pin that must be connected to the thermal pad, to the other GND pins, and to ground with a low-impedance connection. |+| 4 | IN2 | power_in | Input supply pin for LDO 2; a 10 µF or greater input capacitor is required, placed as close to the input as possible. |+| 5 | IN2 | power_in | Input supply pin for LDO 2; a 10 µF or greater input capacitor is required, placed as close to the input as possible. |+| 6 | EN2 | input | Enable pin for channel 2; VEN2 ≥ VIH(EN2) enables the regulator and VEN2 ≤ VIL(EN2) disables it, and it must be connected to IN2 if the enable function is not used. |+| 7 | NR/SS2 | passive | Noise-reduction and soft-start capacitor connection for channel 2; a 10 nF or larger capacitor to GND is recommended, placed as close to the pin as possible. |+| 8 | SS_CTRL2 | input | Soft-start control for channel 2; connect to GND or IN2 to select normal or fast charging of the NR/SS2 capacitor, and to GND if no capacitor is used to avoid output overshoot. |+| 9 | PG2 | output | Open-drain power-good indicator for LDO 2; requires a 10-kΩ to 100-kΩ external pullup resistor and may be left floating or tied to GND if not used. |+| 10 | FB2 | input | Feedback input to the channel 2 error amplifier; a 10 nF feed-forward capacitor to OUT2 is recommended but not required, and it can disrupt PG2 operation. |+| 11 | OUT2 | power_out | Regulated output for LDO 2; requires a 22 µF or larger ceramic capacitor (10 µF or greater effective) to ground placed as close to the output as possible. |+| 12 | OUT2 | power_out | Regulated output for LDO 2; requires a 22 µF or larger ceramic capacitor (10 µF or greater effective) to ground placed as close to the output as possible. |+| 13 | GND | power_in | Ground pin that must be connected to the thermal pad, to the other GND pins, and to ground with a low-impedance connection. |+| 14 | OUT1 | power_out | Regulated output for LDO 1; requires a 22 µF or larger ceramic capacitor (10 µF or greater effective) to ground placed as close to the output as possible. |+| 15 | OUT1 | power_out | Regulated output for LDO 1; requires a 22 µF or larger ceramic capacitor (10 µF or greater effective) to ground placed as close to the output as possible. |+| 16 | FB1 | input | Feedback input to the channel 1 error amplifier; a 10 nF feed-forward capacitor to OUT1 is recommended but not required, and it can disrupt PG1 operation. |+| 17 | PG1 | output | Open-drain power-good indicator for LDO 1; requires a 10-kΩ to 100-kΩ external pullup resistor and may be left floating or tied to GND if not used. |+| 18 | SS_CTRL1 | input | Soft-start control for channel 1; connect to GND or IN1 to select normal or fast charging of the NR/SS1 capacitor, and to GND if no capacitor is used to avoid output overshoot. |+| 19 | NR/SS1 | passive | Noise-reduction and soft-start capacitor connection for channel 1; a 10 nF or larger capacitor to GND is recommended, placed as close to the pin as possible. |+| 20 | EN1 | input | Enable pin for channel 1; VEN1 ≥ VIH(EN1) enables the regulator and VEN1 ≤ VIL(EN1) disables it, and it must be connected to IN1 if the enable function is not used. |+| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | QFN-20-EP(4x4) |+| Category | Power Management (PMIC) |+| Pins | 21 |++## CAD (KiCad official)++- Symbol: `TPS7A8901RTJT`+- Footprint: `Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm`+- 3D model: QFN-20-EP(4x4) (KiCad packages3D, STEP)+- 3D model files: `tps7a8901rtjt-etched.step` / `tps7a8901rtjt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps7a8901rtjt.step` / `tps7a8901rtjt.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/tps7a89) (50 pp, sha256 `0597c8be312f6b57`, retrieved 2026-10-08, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/tps7a8901rtjt-datasheet.pdf)
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a 10 µF or greater input capacitor is required, placed as close to the input as possible."+ },+ {+ "number": "2",+ "name": "IN1",+ "type": "power_in",+ "description": "Input supply pin for LDO 1; a 10 µF or greater input capacitor is required, placed as close to the input as possible."+ },+ {+ "number": "3",+ "name": "GND",+ "type": "power_in",+ "description": "Ground pin that must be connected to the thermal pad, to the other GND pins, and to ground with a low-impedance connection."+ },+ {+ "number": "4",+ "name": "IN2",+ "type": "power_in",+ "description": "Input supply pin for LDO 2; a 10 µF or greater input capacitor is required, placed as close to the input as possible."+ },+ {+ "number": "5",+ "name": "IN2",+ "type": "power_in",+ "description": "Input supply pin for LDO 2; a 10 µF or greater input capacitor is required, placed as close to the input as possible."+ },+ {+ "number": "6",+ "name": "EN2",+ "type": "input",+ "description": "Enable pin for channel 2; VEN2 ≥ VIH(EN2) enables the regulator and VEN2 ≤ VIL(EN2) disables it, and it must be connected to IN2 if the enable function is not used."+ },+ {+ "number": "7",+ "name": "NR/SS2",+ "type": "passive",+ "description": "Noise-reduction and soft-start capacitor connection for channel 2; a 10 nF or larger capacitor to GND is recommended, placed as close to the pin as possible."+ },+ {+ "number": "8",+ "name": "SS_CTRL2",+ "type": "input",+ "description": "Soft-start control for channel 2; connect to GND or IN2 to select normal or fast charging of the NR/SS2 capacitor, and to GND if no capacitor is used to avoid output overshoot."+ },+ {+ "number": "9",+ "name": "PG2",+ "type": "output",+ "description": "Open-drain power-good indicator for LDO 2; requires a 10-kΩ to 100-kΩ external pullup resistor and may be left floating or tied to GND if not used."+ },+ {+ "number": "10",+ "name": "FB2",+ "type": "input",+ "description": "Feedback input to the channel 2 error amplifier; a 10 nF feed-forward capacitor to OUT2 is recommended but not required, and it can disrupt PG2 operation."+ },+ {+ "number": "11",+ "name": "OUT2",+ "type": "power_out",+ "description": "Regulated output for LDO 2; requires a 22 µF or larger ceramic capacitor (10 µF or greater effective) to ground placed as close to the output as possible."+ },+ {+ "number": "12",+ "name": "OUT2",+ "type": "power_out",+ "description": "Regulated output for LDO 2; requires a 22 µF or larger ceramic capacitor (10 µF or greater effective) to ground placed as close to the output as possible."+ },+ {+ "number": "13",+ "name": "GND",+ "type": "power_in",+ "description": "Ground pin that must be connected to the thermal pad, to the other GND pins, and to ground with a low-impedance connection."+ },+ {+ "number": "14",+ "name": "OUT1",+ "type": "power_out",+ "description": "Regulated output for LDO 1; requires a 22 µF or larger ceramic capacitor (10 µF or greater effective) to ground placed as close to the output as possible."+ },+ {+ "number": "15",+ "name": "OUT1",+ "type": "power_out",+ "description": "Regulated output for LDO 1; requires a 22 µF or larger ceramic capacitor (10 µF or greater effective) to ground placed as close to the output as possible."+ },+ {+ "number": "16",+ "name": "FB1",+ "type": "input",+ "description": "Feedback input to the channel 1 error amplifier; a 10 nF feed-forward capacitor to OUT1 is recommended but not required, and it can disrupt PG1 operation."+ },+ {+ "number": "17",+ "name": "PG1",+ "type": "output",+ "description": "Open-drain power-good indicator for LDO 1; requires a 10-kΩ to 100-kΩ external pullup resistor and may be left floating or tied to GND if not used."+ },+ {+ "number": "18",+ "name": "SS_CTRL1",+ "type": "input",+ "description": "Soft-start control for channel 1; connect to GND or IN1 to select normal or fast charging of the NR/SS1 capacitor, and to GND if no capacitor is used to avoid output overshoot."+ },+ {+ "number": "19",+ "name": "NR/SS1",+ "type": "passive",+ "description": "Noise-reduction and soft-start capacitor connection for channel 1; a 10 nF or larger capacitor to GND is recommended, placed as close to the pin as possible."+ },+ {+ "number": "20",+ "name": "EN1",+ "type": "input",+ "description": "Enable pin for channel 1; VEN1 ≥ VIH(EN1) enables the regulator and VEN1 ≤ VIL(EN1) disables it, and it must be connected to IN1 if the enable function is not used."+ },+ {+ "number": "21",+ "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": {+ "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: The thermal pad is part of the QFN-20-EP package but the datasheet does not print a pin number for i; The datasheet lists NR/SSx with I/O type '—' (no direction). Typed as passive because it is a capaci; PGx is an open-drain output with a 10-kΩ to 100-kΩ external pullup; typed as output since the KiCad ",+ "exposed pad 21 added from the footprint"+ ],+ "pages_sent": 12,+ "cost_usd": 0.0814,+ "at": "2026-10-08T00:37:34"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/tps7a89",+ "pages": 50,+ "sha256": "0597c8be312f6b57",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 21,+ "described": 21,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "tps7a8901rtjt.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 4,+ 4,+ 0.77+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "tps7a8901rtjt-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 4,+ 4,+ 0.77+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "770fbdf9f88bb536fffc9a27cb6c87ec72a7ce7bdcf681a1bb061a70e0e492e3",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}