STMicroelectronics 0.7A/1.2V synchronous buck converter STEVAL-ISA055V1 STEVAL-ISA055V1 Scheda Tecnica
Codici prodotto
STEVAL-ISA055V1
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
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
over temperature range
■
R
DS(on)
typ. 250 m
Ω 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.
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.
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
current limited to prevent damage due to
accidental short-circuit. This family of products is
available in the TSOT23-5L package.
available in the TSOT23-5L package.
STEVAL-ISA055V1