EVAL4973: 5.1V @ 3.5A, 8 - 55V in

Summary

The L4973 family is a 3.5A monolithic dc-dc converter, step- down topology, operating in continuous mode. It is realized in BCD60 II technology, and it’s available in two plastic packages, POWERDIP18(12+3+3) and SO20L (12+4+4).

The 5.1V part can be replaced with its 3.3V

Both the regulators can control higher output voltage values, by using an external voltage divider. The operating input supply voltage is ranging from 8V to 55V.

Soft-start does not allow output overvoltages at turn-on, and synchronization function can reduce EMI problems in multiple outputs power supplies. Inhibit, introduced for power management, in equipments having stand-by features, when active( high), reduces the device power consumption, signal plus power stages, at few tens of µA.

Specifications

Manufacturer STMicroelectronics
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Board not Stocked
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 5 V
Current Out 3.5 A
Voltage In 8 ~ 55 V
Efficiency @ Conditions >94%, 12V in, 5.1V @ 500 mA
>84%, 50V in, 5.1V @ 3.5 A
Voltage Out Range 5 ~ 40 V
Features Current Limit (Adj. or Fixed)
Short Circuit Protection
Shutdown, Enable, Standby
Soft Start
Synchronizable
Thermal Protection
Voltage Reference
Switching Frequency 100 kHz
Standby Current [Typical] 150 µA
Quiescent Current [Typical] 2.7 mA
Component Count + Extras 17 + 9
Internal Switch Yes
Design Author STMicroelectronics
Application / Target Market Computers
Medical
Point of Load (PoL)
Telecom
Standby Current [Maximum] 300 µA
Quiescent Current [Maximum] 4 mA
Main I.C. Base Part L4973
Date Created By Author
Date Added To Library 2017-05

Support Documents & Media

EVAL4973 - Application Note - AN938 L4973 - Datasheet

Media

EVAL4973_Schematic.JPG EVAL4973_Board.JPG