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STEVAL-ISA055V2 датащи(PDF) 1 Page - STMicroelectronics

номер детали STEVAL-ISA055V2
подробное описание детали  0.7 A / 3.3 V synchronous buck converter with enable function based on the ST1S12XX
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STEVAL-ISA055V2 датащи(HTML) 1 Page - STMicroelectronics

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Data Brief
For further information contact your local STMicroelectronics sales office.
September 2008
Rev 1
1/4
4
STEVAL-ISA055V2
0.7 A / 3.3 V synchronous buck converter
with enable function based on the ST1S12XX
Features
Step-down current mode PWM (1.7 MHz) DC-
DC converter
Fixed output voltage 3.3 V
0.7 A output current capability
3% DC output voltage tolerance
Synchronous rectification
Enable function
Internal soft-start
Typical efficiency: > 90%
Non switching quiescent current: max 600 µA
over temperature range
RDS(on) typ. 250 mΩ and 400 mΩ
Uses tiny capacitors and inductors
Description
This demonstration board is based on the
ST1S12 family of synchronous step-down DC-DC
converters optimized for powering low-voltage
digital cores in HDD (hard disk drive) applications,
and is generally used to replace high-current
linear solutions when power dissipation may
cause high heating of the application
environment.
It provides up to 0.7 A over an input voltage range
of 2.5 V to 5.5 V. A high switching frequency of 1.7
MHz allows the use of tiny surface-mount
components. A resistor divider to set the output
voltage value, an inductor, and two capacitors are
required for the adjustable version, while only an
inductor and 2 capacitors are needed for the 1.2 V
and 1.8 V fixed version.
A low output ripple is guaranteed by the current
mode PWM topology and by the use of low ESR
surface-mount ceramic capacitors.
The ST1S12 device is thermal protected and
current limited to prevent damage due to
accidental short-circuit. This family of products is
available in the TSOT23-5L package.
STEVAL-ISA055V2
www.st.com


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