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R5973AD fiches techniques PDF

STMicroelectronics - Up to 1.5A step-down switching regulator

Numéro de référence R5973AD
Description Up to 1.5A step-down switching regulator
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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R5973AD fiche technique
R5973AD
Up to 1.5 A step-down switching regulator for aerospace
applications
Datasheet - preliminary data
– Designed and manufactured to meet sub-
ppm quality goals
– Advanced mold and frame designs for
superior resilience in harsh environments
(acceleration, EMI, thermal, humidity)
– Extended screening capability on request
HSOP8 - exposed pad
Features
General features
– 1.5 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
VIN
– Low dropout operation: 100% duty cycle
– 500 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
Applications
Dedicated to aerospace applications
Description
The R5973AD is a step-down monolithic power
switching regulator with a minimum switch current
limit of 1.8 A, so it is able to deliver up to 1.5 A DC
current to the load depending on the application
conditions. The output voltage can be set from
1.235 V to VIN. The high current level is also
achieved thanks to an HSOP8 package with an
exposed frame, that allows to reduce the Rth(JA)
down to approximately 40 °C/W. The device uses
an internal P-channel DMOS transistor (with
a typical RDS(on) of 250 m) as a switching
element to minimize the size of the external
components. An internal oscillator fixes the
switching frequency at 500 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.
October 2014
DocID027027 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/38
www.st.com

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