component
LP8543SQ
Public Made by Adomby adom
Texas Instruments Global Sourcing Parts, WQFN-24-EP(4x4). 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
markdownLP8543SQ
Texas Instruments · Global Sourcing Parts · WQFN-24-EP(4x4)
LP8543SQ from Texas Instruments, in a WQFN-24-EP(4x4). 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 | GND_SW | power_in | Boost ground. |
| 2 | PWM | input | PWM dimming input; this pin must be connected to GND if not used. |
| 3 | IF_SEL | input | Serial interface mode selection: Low selects the I2C-compatible interface and High selects the SMBus interface. |
| 4 | EN | input | Enable input pin. |
| 5 | ALSI | input | Ambient light sensor frequency input; this pin must be connected to GND if ALS is not used. |
| 6 | ALSO | output | Ambient light sensor enable output. |
| 7 | FAULT | output | Fault indication output, open-drain (OD) type. |
| 8 | VDDIO | power_in | Digital IO reference voltage, 1.65V to 5.5V as printed in the pin table; needed in SMBus/I2C and stand-alone mode. |
| 9 | GND_S | power_in | Signal ground. |
| 10 | SCLK | input | Serial clock; this pin must be connected to GND if not used. |
| 11 | SDA | bidirectional | Serial data; this pin must be connected to GND if not used. |
| 12 | OUT1 | passive | Current sink output. |
| 13 | OUT2 | passive | Current sink output. |
| 14 | OUT3 | passive | Current sink output. |
| 15 | GND_L | power_in | Ground for current sink outputs. |
| 16 | OUT4 | passive | Current sink output. |
| 17 | OUT5 | passive | Current sink output; can be left floating if not used. |
| 18 | OUT6 | passive | Current sink output; can be left floating if not used. |
| 19 | OUT7 | passive | Current sink output; can be left floating if not used. |
| 20 | ADR | input | Serial interface address selection; this pin must be connected to GND if not used. |
| 21 | FB | passive | Boost feedback input. |
| 22 | VLDO | power_out | LDO output voltage; a 470 nF capacitor should be connected to this pin. |
| 23 | VIN | power_in | Input power supply, 5.5V to 22V. |
| 24 | SW | passive | Boost switch. |
| 25 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-24-EP(4x4) |
| Category | Global Sourcing Parts |
| Pins | 25 |
CAD (KiCad official)
- Symbol:
LP8543SQ - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm - 3D model: WQFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files:
lp8543sq-etched.step/lp8543sq-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lp8543sq.step/lp8543sq.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (43 pp, sha256
79e09fe108595935, retrieved 2026-10-11, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).