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STEVAL-ISA055V1 bảng dữ liệu(PDF) 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-ISA055V1
0.7 A / 1.2 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 of 1.2 V
0.7 A output current capability
3% DC output voltage tolerance
Synchronous rectification
Enable function
Internal soft-start
Typical efficiency: > 90%
Not 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. For the adjustable version, a resistor
divider to set the output voltage value, an
inductor, and two capacitors are required. 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-ISA055V1
www.st.com


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