LP2951 Micropower LDO

@@ -0,0 +1,52 @@+# LP2951++**Texas Instruments** · Linear Regulator (LDO) · SOIC-8++The LP2951 is a 100 mA micropower low-dropout regulator with low quiescent current (75 uA typ). It offers an adjustable or fixed output, a shutdown input, and a power-good error flag that signals when the output falls out of regulation, making it well suited to battery-powered and always-on designs.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | OUTPUT | power_out | Regulated output supply, up to 100mA. Requires a ceramic capacitor to GND for stability (COUT 1µF to 100µF, ESR 0 to 2Ω on the new chip). Place the output cap as close to the pin as possible. |+| 2 | SENSE | input | Kelvin sense of the output voltage. Tie to OUTPUT (with FEEDBACK tied to VTAP) for the fixed-output configuration. Leave floating when using the adjustable-output configuration. |+| 3 | SHUTDOWN | input | Active-high shutdown input. Drive high (>~1.5V) to disable the regulator; drive low (VSHUTDOWN ≤ 0.7V) to enable normal operation. Absolute max 42V (new chip) / 35V (legacy). |+| 4 | GND | power_in | Device ground reference for the regulator, error comparator, and internal bandgap. |+| 5 | ERROR | output | Active-low open-drain error flag. Asserts (pulls low) when VOUT drops more than ~6% below its nominal value, indicating an out-of-regulation or under-voltage condition. Requires an external pull-up; useful for power-sequencing multiple rails. |+| 6 | VTAP | input | Tap of the internal fixed-voltage resistor divider. Connect to FEEDBACK for the fixed 3.3V/5V output option. Leave floating when using the device in adjustable-output mode. |+| 7 | FEEDBACK | input | Error-amplifier feedback input (regulates to VREF ≈ 1.235V). Connect to VTAP (with OUTPUT tied to SENSE) for fixed output; connect to the mid-point of an external R1/R2 divider for adjustable output (VOUT = VREF × (1 + R1/R2), VREF to 29V). Divider current should be ≥12µA or add a feed-forward cap for stability. |+| 8 | INPUT | power_in | Unregulated supply input, 2V to 30V operating (absolute max 42V new chip / 35V legacy). Bypass with at least a 1µF capacitor to GND close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Micropower adjustable LDO |+| Output current | 100 mA |+| Quiescent current | 75 uA typ |+| Dropout voltage | 380 mV at 100 mA |+| Output | Adjustable (1.24 V ref) or fixed 3.0/3.3/5 V |+| Features | Shutdown, error flag |+| Supply voltage | Up to 30 V |+| Operating temperature | -40 C to 125 C |++## Ordering variants++- `LP2951D`+- `LP2951DRG`++## CAD (KiCad official)++- Symbol: `lp2951.kicad_sym`+- Footprint: `lp2951.kicad_mod`+- 3D model: SOIC-8 body from KiCad `Package_SO/SOIC-8_3.9x4.9mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lp2951.pdf) (49 pp, sha256 `4a441bb26d2b5975`, 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).++[Datasheet PDF](docs/lp2951-datasheet.pdf)

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