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STMicroelectronics Electronic Components Datasheet

R5975D Datasheet

Up to 3A step-down switching regulator

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R5975D
Up to 3 A step-down switching regulator for aerospace applications
HSOP8 - exposed pad
Features
General features
– 3 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
– Advanced mold and frame designs for
superior resilience in harsh environments
(acceleration, EMI, thermal, humidity)
– Extended screening capability on request
Datasheet - preliminary data
Applications
Dedicated to aerospace applications
Description
The R5975D is a step-down monolithic power
switching regulator with a minimum switch current
limit of 3.75 A, it is therefore able to deliver up to
3 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 a HSOP8 package with
exposed frame, that allows to reduce the RTHJ-A
down to approximately 40 °C/W. The device uses
an internal P-channel DMOS transistor (with
a typical RDS(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. Pulse-by-pulse current limit with the
internal frequency modulation offers an effective
constant current short-circuit protection.
October 2014
DocID026878 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/47
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STMicroelectronics Electronic Components Datasheet

R5975D Datasheet

Up to 3A step-down switching regulator

No Preview Available !

Contents
Contents
R5975D
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Datasheet parameters over the temperature range . . . . . . . . . . . . . . . 10
5 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Power supply and voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 Voltage monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 Oscillator and synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 Current protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.5 Error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.6 PWM comparator and power stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.7 Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.8 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Additional features and protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.1 Feedback disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2 Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.3 Zero load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7 Closing the loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.1 Error amplifier and compensation network . . . . . . . . . . . . . . . . . . . . . . . . 19
7.2 LC filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.3 PWM comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2/47 DocID026878 Rev 1


Part Number R5975D
Description Up to 3A step-down switching regulator
Maker STMicroelectronics
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R5975D Datasheet PDF






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