L5973D

STMicroelectronics

-40℃~+150℃@(TJ) 1 1.235V~35V 2.5A 250kHz 4V~36V Adjustable Buck Buck Built-in No SOIC-8-EP DC-DC Converters ROHS

Extended

Category: AC DC Controllers & Regulators
Package: SOIC-8-EP
Pins: 9

Overview

The L5973D is an AC DC Controllers & Regulator made by STMicroelectronics in a SOIC-8-EP package with 9 pins. -40℃~+150℃@(TJ) 1 1.235V~35V 2.5A 250kHz 4V~36V Adjustable Buck Buck Built-in No SOIC-8-EP DC-DC Converters ROHS.

PCBKit's library has its KiCad symbol (Regulator_Switching:L5973D, from KiCad's library) and its footprint (Package_SO:HSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mm, from KiCad's library), ready for a KiCad board. JLCPCB lists it (part C21829). 6 open-source boards in 6 repositories on GitHub use it.

Symbol

Regulator_Switching:L5973DFrom KiCad's library

Footprint

Package_SO:HSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mmFrom KiCad's library

Parameters

Features: Overcurrent Protection, Cycle-by-cycle current limiting, Frequency synchronization
Frequency - Switching: 250kHz
Function: Step-down type
Number of Outputs: 1
Operating Temperature: -40℃~+150℃@(TJ)
Output Current: 2.5A
Output Type: Adjustable
Output Voltage: 1.235V~35V
Quiescent Current: 3mA
Switch tube (built-in/external): Built-in
Synchronous Rectifier: No
Topology: Buck
Voltage - Supply: 4V~36V

Order codes

L5973DLCSC C21829

Pinout

The pins of the L5973D
Pin	Name	Type
1	OUT	Output
2	SYNC	Input/output
3	INH	Input
4	COMP	Passive
5	FB	Input
6	VREF	Output
7	GND	Power in
8	VCC	Power in
9	EP	Passive

Open-source boards using it

All 6

4 layers203.2 × 101.6 mm
Lboard2
electrodyssey/lboard2
experimental Spartan-6 sound processing board with XC6SLX9-TQG144 and TLV320AIC3204
230 parts7LGPL-3.0
2 layers102 × 81 mm
CzujnikiRpi3b
adamkaliszan/FreeRtosOnAvr
An alternative for arduino. Multitasking firmware provides great flexibility.
157 parts2GPL-3.0
4 layers50 × 37 mm
DangerDoughnut
gavin4d/dangerDoughnut

281 parts1
2 layers99.6 × 69.6 mm
RGBW Lampe
martinclausen2/RGBW-Lampe
The "RGBW-Lampe" projects allows to create full color lighting appliances.
162 parts
2 layers102 × 84 mm
3D PrEBo
TheColonelYoung/3D_PREBO
3D printer expansion board. Add more fan controllers, TMC2130 wiring support, induction probe voltage convertor, LED lighting (supports WS1812).
79 partsCC-BY-SA-4.0
2 layers100 × 75 mm
Arachne
TheColonelYoung/Arachne
Mainly 3D printed manipulator with 6 axis of freedom based on design of steward platform
278 partsGPL-3.0

Show this part on your page

A live frame, for any web page

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A picture

<img src="https://pcbkit.io/embed/parts/st/L5973D.jpg" alt="L5973D" width="1200" height="900">

A picture that opens the part, for a README

[![L5973D](https://pcbkit.io/embed/parts/st/L5973D.jpg?size=s)](https://pcbkit.io/parts/st/L5973D)

Questions

Is there a KiCad symbol and footprint for the L5973D?

Yes. The symbol is Regulator_Switching:L5973D and the footprint Package_SO:HSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the L5973D?

SOIC-8-EP, with 9 pins. Its footprint is drawn on this page.

Where is the L5973D datasheet?

STMicroelectronics publishes it: the Datasheet link on this page opens it.

Where can I order the L5973D?

JLCPCB lists it as part C21829, with 0 in stock; the sellers' links on this page open their listings.

Which open-source boards use the L5973D?

6 boards in 6 repositories on GitHub; the most starred are listed on this page, with their KiCad files.