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PDF R5972D Data sheet ( Hoja de datos )
| Número de pieza | R5972D | |
| Descripción | Up to 1.5A step-down switching regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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R5972D
Up to 1.5 A step-down switching regulator for aerospace
applications
Datasheet - preliminary data
– Advanced mold and frame designs for
superior resilience in harsh environments
(acceleration, EMI, thermal, humidity)
– Extended screening capability on request
Application
SO-8
Dedicated to aerospace applications
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
– 250 kHz internally fixed frequency
– Voltage feed-forward
– Zero load current operation
– Internal current limiting
– Inhibit for zero current consumption
– 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
Description
The R5972D 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 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 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.
October 2014
DocID026873 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/35
www.st.com
1 page  
R5972D
2 Electrical data
Electrical data
2.1
Maximum ratings
Symbol
V8
V1
I1
V4, V5
PTOT
TJ
TSTG
Table 2. Absolute maximum ratings
Parameter
Value
Input voltage
OUT pin DC voltage
OUT pin peak voltage at t = 0.1 s
Maximum output current
Analog pins
40
-1 to 40
-5 to 40
Int. limit.
4
Power dissipation at TA 70 °C
Operating junction temperature range
Storage temperature range
1.2
-40 to 150
-55 to 150
Unit
V
V
V
V
W
°C
°C
2.2
Thermal data
Table 3. Thermal data
Symbol
Parameter
RthJA
Maximum thermal resistance junction ambient
1. Package mounted on evaluation board.
Value
65(1)
Unit
°C/W
DocID026873 Rev 1
5/35
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5 Page 
R5972D
Functional description
diode can be considered a high value capacitor and this produces a very high peak current,
responsible for numerous problems:
Spikes on the device supply voltage that cause oscillations (and thus noise) due to the
board parasites.
Turn ON overcurrent leads to a decrease in the efficiency and system reliability.
Major EMI problems.
Shorter freewheeling diode life.
The fall time of the current during turn OFF is also critical, as it produces voltage spikes (due
to the parasites elements of the board) that increase the voltage drop across the PDMOS.
In order to minimize these problems, a new driving circuit topology has been used and the
block diagram is shown in Figure 5. The basic idea is to change the current levels used to
turn the power switch ON and OFF, based on the PDMOS and the gate clamp status.
This circuitry allows the power switch to be turned OFF and ON quickly and addresses the
freewheeling diode recovery time problem. The gate clamp is necessary to ensure that VGS
of the internal switch does not go higher than VGSmax. The ON/OFF control block protects
against any cross conduction between the supply line and ground.
Figure 5. Driving circuitry
5.6 Thermal shutdown
The shutdown block generates a signal that turns OFF the power stage if the temperature of
the chip goes higher than a fixed internal threshold (150 ± 10 °C). The sensing element of
the chip is very close to the PDMOS area, ensuring fast and accurate temperature
detection. A hysteresis of approximately 20 °C keeps the device from turning ON and OFF
continuously.
DocID026873 Rev 1
11/35
35
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet R5972D.PDF ] | |
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