component
LM3478QMMX
Public Made by Adomby adom
Texas Instruments DC-DC Controllers, VSSOP-8-0.65mm. 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
markdownLM3478QMMX
Texas Instruments · DC-DC Controllers · VSSOP-8-0.65mm
LM3478QMMX from Texas Instruments, in a VSSOP-8-0.65mm. 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 | ISEN | input | Current sense input pin; external sense resistor voltage (maximum 500mV) is fed to peak current detection comparator. |
| 2 | COMP | input | Compensation pin; RC network connected here provides control loop compensation and internal slope ramp adjustment. |
| 3 | FB | input | Feedback pin; output voltage is programmed to 1.26V nominal using external resistive divider network. |
| 4 | AGND | power_in | Analog ground reference pin; return path for all signal inputs and feedback circuitry. |
| 5 | PGND | power_in | Power ground reference pin; return path for power stage and internal power circuitry. |
| 6 | DR | output | Drive output pin; provides gate drive signal to external low-side N-channel MOSFET with 1A peak current capability (10µs pulses) and voltage swing limited to 7.2V. |
| 7 | FA/SD | input | Frequency adjust and shutdown pin; resistor to ground programs oscillator frequency from 100kHz to 1MHz, or level >1.35V for >30µs duration triggers shutdown with <10µA quiescent current. |
| 8 | VIN | power_in | Power supply input pin; accepts supply voltage from 2.97V to 40V with integrated 7.2V LDO for internal IC biasing. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | Power Supply Chip |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM3478QMMX - Footprint:
Package_SO:VSSOP-8_2.3x2mm_P0.5mm - 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
- 3D model files:
lm3478qmmx-etched.step/lm3478qmmx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm3478qmmx.step/lm3478qmmx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (38 pp, sha256
2f03cd9714e0eaba, retrieved 2026-09-21, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).