R5973D Datasheet, PDF (1/39 Pages) STMicroelectronics – Up to 2 A step-down switching regulator for aerospace applications

R5973D
Up to 2 A step-down switching regulator for aerospace applications
HSOP8 - exposed pad
Features
 General features
– 2 A DC output current
– Operating input voltage from 4 V to 36 V
– 3.3 V / (± 2%) reference voltage
– Large ambient temperature range:
-40 °C to 125 °C
– Output voltage adjustable from 1.235 V to
35 V
– Low dropout operation: 100% duty cycle
– 250 kHz internally fixed frequency
– Voltage feed-forward
– Zero load current operation
– Internal current limiting
– Inhibit for zero current consumption
– Synchronization
– Protection against feedback disconnection
– Thermal shutdown
 Aerospace and defense features
– Suitable for use in aerospace and defense
applications
– Dedicated traceability and part marking
– Production parts approval documents
available
– Adapted extended life time and
obsolescence management
– Extended product change notification
process
– Designed and manufactured to meet sub-
ppm quality goals
Datasheet - preliminary data
– Advanced mold and frame designs for
superior resilience in harsh environments
(acceleration, EMI, thermal, humidity)
– Extended screening capability on request
Application
 Dedicated to aerospace and defense
applications
Description
The R5973D is a step-down monolithic power
switching regulator with a minimum switch current
limit of 2.25 A so it is able to deliver up to 2 A DC
current to the load depending on the application
conditions. The output voltage can be set from
1.235 V to 35 V. The high current level is also
achieved thanks to an HSOP8 package with
exposed frame, that allows to reduce the R_th(JA)
down to approximately 40 °C/W. The device uses
an internal P-channel DMOS transistor (with
a typical R_DS(on) of 250 m) as switching element
to minimize the size of the external components.
An internal oscillator fixes the switching frequency
at 250 kHz. The large ambient temperature range
makes it ideal for aerospace and defense
applications. A pulse-by-pulse current limit with
the internal frequency modulation offers an
effective constant current short-circuit protection.
September 2014
DocID026876 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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