Overview
The LM3549SQ is a LED Driver made by Texas Instruments in a WQFN-24-EP(4x4) package with 25 pins. WQFN-24-EP(4x4) LED Drivers ROHS.
PCBKit's library has its KiCad symbol (EasyEDA_Cloud:LM3549SQX_NOPB, from EasyEDA) and its footprint (EasyEDA_Cloud:WQFN-24_L4.0-W4.0-P0.50-BL-EP2.5, from EasyEDA), ready for a KiCad board. JLCPCB lists it (part C2860955).
Symbol
Footprint
Order codes
1- LM3549SQ/NOPBLCSC C2860955
Pinout
25| Pin | Name | Type |
|---|---|---|
| 1 | NC | Unspecified |
| 2 | L1 | Unspecified |
| 3 | L1 | Unspecified |
| 4 | GND_SW | Unspecified |
| 5 | L2 | Unspecified |
| 6 | L2 | Unspecified |
| 7 | VOUT | Unspecified |
| 8 | NC | Unspecified |
| 9 | VOUT | Unspecified |
| 10 | R_EN | Unspecified |
| 11 | VDDS | Unspecified |
| 12 | G_EN | Unspecified |
| 13 | B_EN | Unspecified |
| 14 | PWM | Unspecified |
| 15 | GND | Unspecified |
| 16 | R_OUT | Unspecified |
| 17 | G_OUT | Unspecified |
| 18 | B_OUT | Unspecified |
| 19 | FAULT | Unspecified |
| 20 | SDA | Unspecified |
| 21 | SCL | Unspecified |
| 22 | EN | Unspecified |
| 23 | VDDP | Unspecified |
| 24 | NC | Unspecified |
| 25 | EP | Unspecified |
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<iframe src="https://pcbkit.io/embed/parts/ti/LM3549SQ" title="LM3549SQ in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/ti/LM3549SQ.jpg" alt="LM3549SQ" width="1200" height="900">[](https://pcbkit.io/parts/ti/LM3549SQ)Questions
Is there a KiCad symbol and footprint for the LM3549SQ?
Yes. The symbol is EasyEDA_Cloud:LM3549SQX_NOPB and the footprint EasyEDA_Cloud:WQFN-24_L4.0-W4.0-P0.50-BL-EP2.5, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the LM3549SQ?
WQFN-24-EP(4x4), with 25 pins. Its footprint is drawn on this page.
Where is the LM3549SQ datasheet?
Texas Instruments publishes it: the Datasheet link on this page opens it.
Where can I order the LM3549SQ?
JLCPCB lists it as part C2860955, with 0 in stock; the sellers' links on this page open their listings.
What can replace the LM3549SQ?
Parts like it in the library: the LP55231SQX by Texas Instruments, the LP8556SQX-E08 by Texas Instruments, the LP3944ISQ by Texas Instruments and the LM27965SQ by Texas Instruments. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Parts like it
7
LP55231SQX
WQFN-24-EP(4x4)-30℃~+85℃ 1.25MHz 2.7V~5.5V 25.5mA 4% 9 Built-in Charge Pump Over Current Protection、Short-Circuit Protection PWM、I2C WQFN-24-EP(4x4) LED Drivers ROHSTexas InstrumentsLED DriversLP8556SQX-E08
WQFN-24-EP(4x4)-30℃~+85℃ 23mA 312kHz~1.25MHz 4 Boost PWM、I2C Short Circuit Protection、Over Voltage Protection、Over-Temperature Protection (OTP)、LED open-circuit protection、Built-in soft-start WQFN-24-EP(4x4) LED Drivers ROHSTexas InstrumentsLED DriversLP3944ISQ
WQFN-24-EP(4x4)-40℃~+85℃ 2.3V~5.5V 25mA 8 Built-in I2C WQFN-24-EP(4x4) LED Drivers ROHSTexas InstrumentsLED DriversLM27965SQ
WQFN-24(4x4)-30℃~+85℃ 1.27MHz 2.7V~5.5V 2V~4V 30mA 9 DC-DC Voltage Regulator I2C Switched Capacitor (Charge Pump) WQFN-24(4x4) LED DriversTexas InstrumentsLED DriversLM27965SQ-M
WQFN-24(4x4)-30℃~+85℃ 1.27MHz 2.7V~5.5V 2V~4V 30mA 9 DC-DC Voltage Regulator I2C Switched Capacitor (Charge Pump) WQFN-24(4x4) LED Drivers ROHSTexas InstrumentsLED DriversLM2754SQ
WQFN-24-EP(4x4)WQFN-24-EP(4x4) LED Drivers ROHSTexas InstrumentsLED DriversLP3943ISQ
WQFN-24-EP(4x4)-40℃~+85℃ 16 2.3V~5.5V 25mA Built-in PWM、I2C WQFN-24-EP(4x4) LED Drivers ROHSTexas InstrumentsLED Drivers