LM3550SPX

Texas Instruments

-30℃~+85℃ 1 1MHz 2.7V~5.5V 5.3V 5A DC-DC External PWM UQFN-20-EP(2.5x3) LED Drivers ROHS

Extended

Category: LED Drivers
Package: UQFN-20-EP(2.5x3)
Pins: 21

Overview

The LM3550SPX is a LED Driver made by Texas Instruments in a UQFN-20-EP(2.5x3) package with 21 pins. -30℃~+85℃ 1 1MHz 2.7V~5.5V 5.3V 5A DC-DC External PWM UQFN-20-EP(2.5x3) LED Drivers ROHS.

PCBKit's library has its KiCad symbol (EasyEDA_Cloud:LM3550SPX_NOPB, from EasyEDA) and its footprint (EasyEDA_Cloud:UQFN-20_L3.0-W2.5-P0.40-BL-EP, from EasyEDA), ready for a KiCad board. 30 are in stock at JLCPCB (part C2678950).

Symbol

EasyEDA_Cloud:LM3550SPX_NOPBFrom EasyEDA

Footprint

EasyEDA_Cloud:UQFN-20_L3.0-W2.5-P0.40-BL-EPFrom EasyEDA

Parameters

Dimming: PWM
Features: Over Voltage Protection
Frequency - Switching: 1MHz
Number of Channels: 1
Operating temperature: -30℃~+85℃
Output Current: 5A
Output Voltage: 5.3V
Switch Tube (Built-In/External): External
Type: DC-DC
Voltage - Input(DC): 2.7V~5.5V

Order codes

LM3550SPX/NOPBLCSC C2678950

Pinout

The pins of the LM3550SPX
Pin	Name	Type
1	VOUT	Unspecified
2	BAL	Unspecified
3	LED-	Unspecified
4	FET_CON	Unspecified
5	FB	Unspecified
6	EOC#	Unspecified
7	GND	Unspecified
8	SDA	Unspecified
9	GND	Unspecified
10	SCL	Unspecified
11	STROBE	Unspecified
12	ALD/TEMP	Unspecified
13	IND	Unspecified
14	VIN	Unspecified
15	C2+	Unspecified
16	C2–	Unspecified
17	GND	Unspecified
18	C1–	Unspecified
19	GND	Unspecified
20	C1+	Unspecified
21	GND	Unspecified

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A picture

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A picture that opens the part, for a README

[![LM3550SPX](https://pcbkit.io/embed/parts/ti/LM3550SPX.jpg?size=s)](https://pcbkit.io/parts/ti/LM3550SPX)

Questions

Is there a KiCad symbol and footprint for the LM3550SPX?

Yes. The symbol is EasyEDA_Cloud:LM3550SPX_NOPB and the footprint EasyEDA_Cloud:UQFN-20_L3.0-W2.5-P0.40-BL-EP, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the LM3550SPX?

UQFN-20-EP(2.5x3), with 21 pins. Its footprint is drawn on this page.

Where is the LM3550SPX datasheet?

Texas Instruments publishes it: the Datasheet link on this page opens it.

Where can I order the LM3550SPX?

JLCPCB lists it as part C2678950, with 30 in stock; the sellers' links on this page open their listings.

What can replace the LM3550SPX?

Parts like it in the library: the LM3550SP by Texas Instruments and the LP3936SLX by Texas Instruments. Check their datasheets: a part that fits the footprint may still differ in its ratings.