STMicroelectronics 2 A DC step-down switching regulator with 4 V/36 V input voltage range based on the L5973D STEVAL-ISA STEVAL-ISA101V1 Data Sheet

For further information contact your local STMicroelectronics sales office.

May 2012

Doc ID 023235 Rev 1

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2 A DC step-down switching regulator with 4 V/36 V input voltage

range based on the L5973D

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V

in

: 4 V  to  36 V

■

V

out

: 1.235 V  to  36 V

■

Output current:  2 A DC

■

Internal oscillator switching frequency: 250 kHz

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Short-circuit protection

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Inhibit and thermal shutdown 

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RoHS compliant

The STEVAL-ISA101V1 demonstration board is 
based on the L5973D, a step-down monolithic 
switching regulator with 2 A DC (2.5 A switch 
peak current) current capability over the output 
voltage range (1.235 V to 36 V).

The operating input voltage ranges from 4 V to   
36 V. The device is based on BCD5 technology. 
The embedded power element is a P-channel    
D-MOS transistor so the driving stage does not 
require any bootstrap capacitor and the duty cycle 
can range up to 100%.

An internal oscillator fixes the switching frequency 
at 250 kHz. A synchronization pin is available 
when a higher switching frequency (up to 700 
kHz) is required. 

Pulse-by-pulse current protection and a frequency 
foldback feature always guarantee an effective 
short-circuit protection. Other features include 
voltage feed-forward, protection against feedback 
disconnection, inhibit and thermal shutdown.

Previous sales code: EVAL5973D.