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LM2991SX
Public Made by Adomby adom
Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-263-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LM2991SX
Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-5
LM2991SX from Texas Instruments, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | ADJ | input | Feedback pin to the control loop for programming the output voltage. |
| 2 | ON/OFF | input | TTL/CMOS compatible ON/OFF input to enable (low) or disable (high, minimum 2.4 V at temperature extremes) the regulator output. |
| 3 | IN | power_in | Negative input voltage supply operating from −26 V to −6 V, internally connected to thermal tab. |
| 4 | GND | power_in | Ground reference. |
| 5 | OUT | power_out | Regulated negative output voltage from −3 V to −24 V, typical range −2 V to −25 V, with maximum load current of 1 A. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-263-5 |
| Category | Power Management (PMIC) |
| Pins | 6 |
CAD (KiCad official)
- Symbol:
LM2991SX - Footprint:
Package_TO_SOT_SMD:TO-263-5_TabPin6 - 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files:
lm2991sx-etched.step/lm2991sx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2991sx.step/lm2991sx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (28 pp, sha256
a1c687953da1d6a9, retrieved 2026-09-23, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).
# LM2991SX
**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-5
LM2991SX from Texas Instruments, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
## Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | ADJ | input | Feedback pin to the control loop for programming the output voltage. |
| 2 | ON/OFF | input | TTL/CMOS compatible ON/OFF input to enable (low) or disable (high, minimum 2.4 V at temperature extremes) the regulator output. |
| 3 | IN | power_in | Negative input voltage supply operating from −26 V to −6 V, internally connected to thermal tab. |
| 4 | GND | power_in | Ground reference. |
| 5 | OUT | power_out | Regulated negative output voltage from −3 V to −24 V, typical range −2 V to −25 V, with maximum load current of 1 A. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-263-5 |
| Category | Power Management (PMIC) |
| Pins | 6 |
## CAD (KiCad official)
- Symbol: `LM2991SX`
- Footprint: `Package_TO_SOT_SMD:TO-263-5_TabPin6`
- 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files: `lm2991sx-etched.step` / `lm2991sx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2991sx.step` / `lm2991sx.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/lm2991) (28 pp, sha256 `a1c687953da1d6a9`, retrieved 2026-09-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/lm2991sx-datasheet.pdf)