STEVAL-ISA055V2 [STMICROELECTRONICS]
0.7 A / 3.3 V synchronous buck converter with enable function based on the ST1S12XX; 基于对ST1S12XX 0.7 A / 3.3 V同步降压转换器，使能功能
| 型号： | STEVAL-ISA055V2 |
| 厂家： | 
ST |
| 描述： | 0.7 A / 3.3 V synchronous buck converter with enable function based on the ST1S12XX |
| 文件： | 总4页 (文件大小：75K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
STEVAL-ISA055V2
0.7 A / 3.3 V synchronous buck converter
with enable function based on the ST1S12XX
Data Brief
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
STEVAL-ISA055V2
■ R
typ. 250 mΩ and 400 mΩ
DS(on)
■ 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
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.
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.
September 2008
Rev 1
1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Schematic diagram
STEVAL-ISA055V2
1
Schematic diagram
Figure 1.
ST1S12 circuit schematic diagram
V
IN
V
4
1
IN
R
ST1S12
EN
L
3
SW
EN
V
OUT
V
GND
2
FB
5
R1
C
IN
C
OUT
R2
GND
AM00303
2/4
STEVAL-ISA055V2
Revision history
2
Revision history
Table 1.
Date
18-Sep-2008
Document revision history
Revision
Changes
1
Initial release.
3/4
STEVAL-ISA055V2
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