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PDF B5973D Data sheet ( Hoja de datos )
| Número de pieza | B5973D | |
| Descripción | 2A step down switching regulator | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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B5973D
2 A step down switching regulator for automotive applications
Datasheet - production data
Protection against feedback disconnection
Thermal shutdown
HSOP8 - exposed pad
Applications
Dedicated to automotive applications
Features
Qualified following the AEC-Q100
requirements (temperature Grade 1), see
PPAP for more details.
2 A DC output current
Operating input voltage from 4 V to 36 V
3.3 V / (± 2 %) reference voltage
Output voltage adjustable from 1.235 V to 35 V
Low dropout operation: 100 % duty cycle
250 kHz internally fixed frequency
Voltage feedforward
Zero load current operation
Internal current limiting
Inhibit for zero current consumption
Synchronization
Description
The B5973D 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 (i.e. SO8
package with 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 RDSon of 250 m)
as switching element to minimize the size of the
external components. An internal oscillator fixes
the switching frequency at 250 kHz. Having a
minimum input voltage of 4 V only, it is particularly
suitable for 5 V bus. Pulse by pulse current limit
with the internal frequency modulation offers an
effective constant current short-circuit protection.
Figure 1. Typical application
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December 2013
This is information on a product in full production.
DocID14117 Rev 4
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www.st.com
1 page  
B5973D
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
2.25
-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 board.
SO8
40(1)
Unit
°C/W
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B5973D
Functional description
The synchronization feature of a set of the B5973D is simply get connecting together their
SYNC pin. The device with highest switching frequency will be the MASTER and it provides
the synchronization signal to the others. Therefore the SYNC is an I/O pin to deliver or
recognize a frequency signal. The synchronization circuitry is powered by the internal
reference (VREF) so a small filtering capacitor (100 nF) connected between VREF pin and
the signal ground of the Master device is suggested for its proper operation. However when
a set of synchronized devices populates a board it is not possible to know in advance the
one working as Master, so the filtering capacitor have to be designed for whole set of
devices.
When one or more devices are synchronized to an external signal, its amplitude have to be
in comply with specifications given in Table 4 on page 6. The frequency of the
synchronization signal must be, at a minimum, higher than the maximum guaranteed natural
switching frequency of the device (275 kHz, see Table 4) while the duty cycle of the
synchronization signal can vary from approximately 10% to 90%. The small capacitor under
VREF pin is required for this operation.
Figure 5. Oscillator circuit block diagram
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DocID14117 Rev 4
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet B5973D.PDF ] | |
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