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LP3944ISQ

Public Made by Adom

by adom

Texas Instruments LED Drivers, WQFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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PCB Footprint

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Datasheet

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Contents

README

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LP3944ISQ

Texas Instruments · LED Drivers · WQFN-24-EP(4x4)

LP3944ISQ 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 LED0 bidirectional Open-drain output of the LED0 driver, rated at 25 mA maximum per pin and 200 mA total per package; unused LED pins can serve as GPIO.
2 LED1 bidirectional Open-drain output of the LED1 driver, rated at 25 mA maximum per pin and 200 mA total per package; unused LED pins can serve as GPIO.
3 LED2 bidirectional Open-drain output of the LED2 driver, rated at 25 mA maximum per pin and 200 mA total per package; unused LED pins can serve as GPIO.
4 LED3 bidirectional Open-drain output of the LED3 driver, rated at 25 mA maximum per pin and 200 mA total per package; unused LED pins can serve as GPIO.
5 LED4 bidirectional Open-drain output of the LED4 driver, rated at 25 mA maximum per pin and 200 mA total per package; unused LED pins can serve as GPIO.
6 LED5 bidirectional Open-drain output of the LED5 driver, rated at 25 mA maximum per pin and 200 mA total per package; unused LED pins can serve as GPIO.
7 LED6 bidirectional Open-drain output of the LED6 driver, rated at 25 mA maximum per pin and 200 mA total per package; unused LED pins can serve as GPIO.
8 LED7 bidirectional Open-drain output of the LED7 driver, rated at 25 mA maximum per pin and 200 mA total per package; unused LED pins can serve as GPIO.
9 GND power_in Ground reference; all device voltages are specified with respect to this pin.
10 NC unconnected No connect; the datasheet assigns no function to this pin.
11 NC unconnected No connect; the datasheet assigns no function to this pin.
12 NC unconnected No connect; the datasheet assigns no function to this pin.
13 NC unconnected No connect; the datasheet assigns no function to this pin.
14 NC unconnected No connect; the datasheet assigns no function to this pin.
15 NC unconnected No connect; the datasheet assigns no function to this pin.
16 NC unconnected No connect; the datasheet assigns no function to this pin.
17 NC unconnected No connect; the datasheet assigns no function to this pin.
18 RST input Active-low reset input; holding it low for the reset pulse width (10 ns minimum) returns the device to its default state, and programming is allowed only after RST is high again; digital input limits are VIL 0.8 V max and VIH 2.0 V min, absolute maximum 6 V.
19 SCL input Clock line for the I2C interface, with input levels of -0.5 V to 0.3VDD (low) and 0.7VDD to 5.5 V (high) and a 6 V absolute maximum; the I2C clock frequency is up to 400 kHz.
20 SDA bidirectional Serial data line for the I2C interface; data must remain stable while SCL is high, with input levels of -0.5 V to 0.3VDD (low) and 0.7VDD to 5.5 V (high) and a 6 V absolute maximum.
21 VDD power_in Power supply, operating over 2.3 V to 5.5 V with an absolute maximum of 6 V with respect to GND.
22 A0 input I2C address input 0, selecting one of the selectable chip address bits (bits 3 to 1); digital input limits are VIL 0.8 V max, VIH 2.0 V min, and 6 V absolute maximum.
23 A1 input I2C address input 1, selecting one of the selectable chip address bits (bits 3 to 1); digital input limits are VIL 0.8 V max, VIH 2.0 V min, and 6 V absolute maximum.
24 A2 input I2C address input 2, selecting one of the selectable chip address bits (bits 3 to 1); digital input limits are VIL 0.8 V max, VIH 2.0 V min, and 6 V absolute maximum.
25 EPAD passive Exposed thermal pad that must be soldered to the printed circuit board for thermal and mechanical performance.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package WQFN-24-EP(4x4)
Category LED Drivers
Pins 25

CAD (KiCad official)

  • Symbol: LP3944ISQ
  • 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: lp3944isq-etched.step / lp3944isq-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lp3944isq.step / lp3944isq.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (20 pp, sha256 1767a841bf9deb44, retrieved 2026-10-11, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF