LP2985

@@ -0,0 +1,49 @@+# LP2985++**Texas Instruments** · 150 mA low-noise LDO · SOT-23-5++A 150 mA low-dropout regulator tuned for low output noise, in SOT-23-5. A bypass pin takes a small capacitor that filters the internal reference, dropping output noise to levels that suit RF, ADC references, PLLs, and sensor front ends where a plain LDO would inject too much hash. It has a logic enable (ON/OFF) for power sequencing and shutdown, good line and load regulation, and needs only small ceramic capacitors. This page is the fixed 3.3 V version; the family covers 1.8 to 5 V. Input up to 16 V.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VIN | power_in | Input supply pin. Range 2.5V to 16V (new chip) or 2.2V to 16V (legacy). Requires a 1µF or larger input capacitor from this pin to ground. |+| 2 | GND | power_in | Ground reference for the regulator. Carries the quiescent (GND pin) current, up to about 890µA at 150mA load. |+| 3 | ON/OFF | input | Active-high enable input for the LDO. Drive high (≥1.6V) to enable the regulator, low (≤0.15V) to place the device in shutdown. Tie to VIN if unused; do not leave floating. Withstands up to 16V (legacy) or 18V (new chip). |+| 4 | BYPASS | passive | Reference-voltage bypass pin used to lower output noise. Connect an external capacitor (typically 10nF) from BYPASS to GND to achieve the specified 30µVRMS noise performance and improve PSRR. |+| 5 | VOUT | power_out | Regulated output of the LDO, delivering up to 150mA at the factory-fixed output voltage (1.2V-5.0V in 100mV steps for new chip). Requires an output capacitor of at least 2.2µF (new chip) or 1µF effective, with ESR ≤1Ω for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Low-noise LDO regulator |+| Output current | 150 mA |+| Output voltage | 3.3 V (fixed, this variant) |+| Noise | low (bypass-pin filtered) |+| Enable | ON/OFF logic pin |+| Dropout | ~280 mV at 150 mA |+| Input voltage | up to 16 V |+| Package | SOT-23-5 |++## Ordering variants++- `LP2985AIM5-3.3 (SOT-23-5)`+- `LP2985IM5X-3.3 (SOT-23-5, tape & reel)`++## CAD (KiCad official)++- Symbol: `Regulator_Linear:LP2985-3.3`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lp2985.pdf) (43 pp, sha256 `bd79c7c5719a63c1`, 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/lp2985-datasheet.pdf)

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