component
LP2951ACMX-3.3
Public Unreviewedby Ray
Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLP2951ACMX-3.3
Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOIC-8
LP2951ACMX-3.3 from Texas Instruments, in a SOIC-8. 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 | OUT | power_out | Regulated 3.3-V output (±0.5% initial tolerance for the AC grade). Rated for 100-mA continuous load current. Requires a minimum output capacitor (typ. 2.2 µF, ESR 10 mΩ-6 Ω) for loop stability. |
| 2 | SENSE | input | Output-voltage sense input for the internal error amplifier. Normally connected directly to OUT (pin 1) at the load to compensate for wiring/trace drops. Do not leave floating in the fixed-output configuration. |
| 3 | SHUTDOWN | input | Logic-level shutdown input. Drive high (>2 V) to disable the regulator (output off, quiescent current drops to a few µA); drive low (<0.7 V) or tie to GND for normal operation. Absolute maximum is 30 V. |
| 4 | GROUND | power_in | Device ground reference. Return for the internal reference, error amplifier, and pass-element quiescent current. |
| 5 | ERROR | output | Open-collector error/dropout flag output (active-low). Pulls low when the output falls approximately 5% below its nominal regulated value (e.g. supply dropout or shutdown). Requires an external pull-up resistor; useful for power-on reset or low-battery warning. |
| 6 | VTAP | output | Center-tap of the internal output-programming resistor divider, exposing the internal 1.235-V bandgap reference. Can be used as a low-current reference, or bypassed with a small capacitor to GND to reduce output noise. |
| 7 | FEEDBACK | input | Inverting error-amplifier feedback input. Tie to OUT (or the top of an external resistor divider from OUT) to select the fixed 3.3-V output; use with external divider to program the output from 1.24 V to 29 V. Absolute maximum −1.5 V to +30 V. |
| 8 | IN | power_in | Unregulated input supply. Operating range 2.3 V to 30 V (must be at least ~VOUT + dropout, typ. 40 mV at light load, 380 mV at 100 mA). Bypass locally with a 1-µF capacitor to GND. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
LP2951ACMX-3.3LP2951ACMX-3.3ACDGKLP2951ACMX-3.3ACDGKXLP2951ACMX-3.3CDGKLP2951ACMX-3.3CDGKXLP2951ACMX-3.3ACNGTLP2951ACMX-3.3ACNGTXLP2951ACMX-3.3CNGTLP2951ACMX-3.3CNGTXLP2951ACMX-3.3ACNLP2951ACMX-3.3CN
CAD (KiCad official)
- Symbol:
LP2951ACMX-3.3 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (54 pp, sha256
a598f6d0f6acb68d, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).