component
LM4991MAX
Public Made by Adomby adom
Texas Instruments Audio Amplifiers, SOIC-8. Pinout cross-checked by two models against the datasheet, 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
markdownLM4991MAX
Texas Instruments · Audio Amplifiers · SOIC-8
LM4991MAX from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SHUTDOWN | input | Shutdown control input that turns off the amplifier bias circuitry when VDD (logic high) is applied, giving about 0.1µA typical shutdown current; it should be tied to a definite voltage. |
| 2 | BYPASS | passive | Half-supply bypass pin for the bias voltage, where an external capacitor CB (1.0µF recommended) to ground improves PSRR and click-and-pop performance. |
| 3 | +IN | input | Non-inverting amplifier input. |
| 4 | -IN | input | Inverting amplifier input, where the input resistor Ri and feedback resistor Rf set the gain (AVD = 2*(Rf/Ri)). |
| 5 | Vo1 | output | Bridged amplifier output 1, driven by the first amplifier and biased at VDD/2 with no output coupling capacitor required. |
| 6 | VDD | power_in | Positive supply input, with an operating range of 2.2V to 5.5V (6.0V absolute maximum) that needs a nearby bypass capacitor. |
| 7 | GND | power_in | Ground connection. |
| 8 | Vo2 | output | Bridged amplifier output 2, driven by the second amplifier (unity-gain inverting), 180° out of phase with Vo1. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM4991MAX - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
lm4991max-etched.step/lm4991max-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm4991max.step/lm4991max.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (27 pp, sha256
69de3029d691cac1, retrieved 2026-10-07, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-5-5(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).