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PDF R5973AD Data sheet ( Hoja de datos )
| Número de pieza | R5973AD | |
| Descripción | Up to 1.5A step-down switching regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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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
1 page  
R5973AD
2 Electrical data
Electrical data
2.1
Maximum ratings
Symbol
V8
V1
I1
V4, V5
V3
V2
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
INH
SYNCH
Power dissipation at TA 70 °C
Operating junction temperature range
Storage temperature range
-0.3 to VCC
-0.3 to 4
2
-40 to 150
-55 to 150
Unit
V
V
V
V
V
V
W
°C
°C
2.2
Thermal data
Symbol
Table 3. Thermal data
Parameter
RthJA
Maximum thermal resistance junction ambient
1. Package mounted on the evaluation board.
Value
40(1)
Unit
°C/W
DocID027027 Rev 1
5/38
38
5 Page 
R5973AD
Functional description
Figure 4. Oscillator circuit block diagram
Figure 5. Synchronization example
5.4 Current protection
The R5973AD device features two types of current limit protection: pulse-by-pulse and
frequency foldback.
The schematic of the current limitation circuitry for the pulse-by-pulse protection is shown in
Figure 6. The output power PDMOS transistor is split into two parallel PDMOS transistors.
The smallest one includes a resistor in series, RSENSE. The current is sensed through
RSENSE and if it reaches the threshold, the mirror becomes unbalanced and the PDMOS is
switched off until the next falling edge of the internal clock pulse. Due to this reduction of the
ON time, the output voltage decreases. Since the minimum switch ON time necessary to
sense the current in order to avoid a false overcurrent signal is too short to obtain
a sufficiently low duty cycle at 500 kHz (see Section 8.4 on page 26), the output current in
DocID027027 Rev 1
11/38
38
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet R5973AD.PDF ] | |
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