STEVAL-ISA055V1 STMicroelectronics, STEVAL-ISA055V1 Datasheet
STEVAL-ISA055V1
Manufacturer Part Number
STEVAL-ISA055V1
Description
BOARD EVAL BASED ON ST1S12
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA055V1
Mfg Application Notes
ST1S12 AppNote
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.2V
Current - Output
700mA
Voltage - Input
2.5 ~ 5.5V
Regulator Topology
Buck
Frequency - Switching
1.7MHz
Board Type
Fully Populated
Utilized Ic / Part
ST1S12
Input Voltage
2.5 V to 5.5 V
Output Voltage
1.2 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
ST1S12XX
Kit Application Type
Power Management - Voltage Regulator
Application Sub Type
Synchronous Buck Converter
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
ST1S12x
Other names
497-8219
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA055V1
Manufacturer:
STMicroelectronics
Quantity:
1
Features
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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
September 2008
For further information contact your local STMicroelectronics sales office.
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
R
Uses tiny capacitors and inductors
DS(on)
typ. 250 mΩ and 400 mΩ
with enable function based on the ST1S12XX
0.7 A / 1.2 V synchronous buck converter
Rev 1
accidental short-circuit. This family of products is
available in the TSOT23-5L package.
STEVAL-ISA055V1
STEVAL-ISA055V1
Data Brief
www.st.com
1/4
4
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STEVAL-ISA055V1 Summary of contents
Page 1
... September 2008 For further information contact your local STMicroelectronics sales office. 0 1.2 V synchronous buck converter with enable function based on the ST1S12XX accidental short-circuit. This family of products is available in the TSOT23-5L package. Rev 1 STEVAL-ISA055V1 STEVAL-ISA055V1 Data Brief 1/4 www.st.com 4 ...
Page 2
... Schematic diagram 1 Schematic diagram Figure 1. ST1S12 circuit schematic diagram 2 ST1S12 1 EN GND 2 STEVAL-ISA055V1 GND V OUT C OUT AM00303 ...
Page 3
... STEVAL-ISA055V1 2 Revision history Table 1. Document revision history Date 18-Sep-2008 Revision 1 Initial release. Revision history Changes 3/4 ...
Page 4
... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 4/4 Please Read Carefully: © 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com STEVAL-ISA055V1 ...