EVAL5973D: 3.3V @ 2A, 4.4 ~ 36Vin (25V Board)

Summary

The L5973D is a step down monolithic power switching regulator capable to deliver up to 2.5 A at output voltages from 1.235 V to 35 V. The operating input voltage ranges from 4.4 V to 36 V. It is realized in BCDV technology and the power switching element is realised by a P-Channel D-MOS transistor. It doesn’t require a bootstrap capacitor, and the duty cycle can range up to 100%.

An internal oscillator fixes the switching frequency at 250 KHz. This minimizes the LC output filter. Synchronization pin is available in the case higher frequency (up to 500 KHz) is requested.

Pulse by pulse and frequency foldback overcurrent protections offer an effective short circuit protection. Other features are voltage feed forward, protection against feedback disconnection, inhibit and thermal shutdown.

The device is housed in an HSOP8 package with exposed pad that helps to reduce the thermal resistance Jiunction to Ambient (RThj-a) down to approximately 40 °C/W.

Specifications

Manufacturer	STMicroelectronics
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	497-4134-ND
Eval Board Supplier	STMicroelectronics
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	3.3 V
Current Out	2 A
Voltage In	4.4 ~ 36 V
Efficiency @ Conditions	>85%, 12V in, 5V @ 0.2 ~ 2 A >81%, 5V in, 3.3V @ 100 mA ~ 2 A >79%, 12V in, 3.3V @ 200 mA ~ 2 A >77%, 5V in, 2.5V @ 100 mA ~ 2 A >75%, 12V in, 2.5V @ 200 mA ~ 2 A >71%, 5V in, 1.8V @ 100 mA ~ 2 A
Voltage Out Range	1.25 ~ Vin
Features	Over Current Protection Short Circuit Protection Shutdown, Enable, Standby Synchronizable Thermal Protection
Switching Frequency	250 kHz
Standby Current [Typical]	80 µA
Quiescent Current [Typical]	3 mA
Component Count + Extras	9 + 3
Internal Switch	Yes
Design Author	STMicroelectronics
Application / Target Market	Computers DVD/Blu-ray Players Point of Load (PoL) Set-Top Boxes Telecom
Standby Current [Maximum]	150 µA
Quiescent Current [Maximum]	5 mA
Main I.C. Base Part	L5973D
Date Created By Author
Date Added To Library	2011-03