LM4890S

@@ -0,0 +1,47 @@+# LM4890S++**IDCHIP** · Audio Power OpAmps · MSOP-8++LM4890S from IDCHIP, in a MSOP-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 | SHUTDOWN | input | Active-low shutdown control. Drive high (VIH ≥ 1.2V) for normal operation; drive low (VIL ≤ 0.4V) to place the amplifier into low-power shutdown mode (ISD ≈ 0.1µA typ). |+| 2 | BYPASS | passive | Internal common-mode (half-supply) bias bypass node. Connect a bypass capacitor (typically 1µF) from this pin to GND to filter the internal mid-rail reference and improve PSRR / pop suppression. |+| 3 | +IN | input | Non-inverting analog audio input of the internal amplifier A1. Typically AC-referenced to the BYPASS mid-rail in the standard application. |+| 4 | -IN | input | Inverting analog audio input. Sets the closed-loop gain via external RIN (typ 20kΩ) and Rf (typ 68kΩ); combines with CIN to form the input high-pass filter fC = 1/(2π·RIN·CIN). |+| 5 | VO1 | output | BTL speaker output (negative/inverting side of the bridge, VOUT-). Connect one terminal of the 8Ω speaker load between VO1 (pin 5) and VO2 (pin 8). No output coupling capacitor required. |+| 6 | VDD | power_in | Positive supply input, 2.2V to 5.5V operating range (5.5V absolute max). Decouple locally with CS (typ 1µF) to GND. |+| 7 | GND | power_in | Ground / supply return. All voltages in the datasheet are referenced to this pin. |+| 8 | VO2 | output | BTL speaker output (positive/non-inverting side of the bridge, VOUT+). Connect the other terminal of the 8Ω speaker load here. No output coupling capacitor required. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | IDCHIP |+| Package | MSOP-8 |+| Category | Op-amp/Cmp |+| Pins | 8 |++## Ordering variants++- `LM4890SS`++## CAD (KiCad official)++- Symbol: `LM4890S`+- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`+- 3D model: MSOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [IDCHIP datasheet](docs/lm4890s-datasheet.pdf) (8 pp, sha256 `a83b352f78b378f3`, retrieved 2026-08-17, tier: lcsc)+- **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/lm4890s-datasheet.pdf)

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