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MIC2571-2BMM 参数 Datasheet PDF下载

MIC2571-2BMM图片预览
型号: MIC2571-2BMM
PDF下载: 下载PDF文件 查看货源
内容描述: 单节开关稳压器 [Single-Cell Switching Regulator]
分类和应用: 稳压器开关
文件页数/大小: 12 页 / 569 K
品牌: MIC [ MIC GROUP RECTIFIERS ]
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MIC2571
Micrel
MIC2571
Single-Cell Switching Regulator
Final Information
General Description
Micrel’s MIC2571 is a micropower boost switching regulator
that operates from one alkaline, nickel-metal-hydride cell, or
lithium cell.
The MIC2571 accepts a positive input voltage between 0.9V
and 15V. Its typical no-load supply current is 120µA.
The MIC2571 is available in selectable fixed output or adjust-
able output versions. The MIC2571-1 can be configured for
2.85V, 3.3V, or 5V by connecting one of three separate
feedback pins to the output. The MIC2571-2 can be config-
ured for an output voltage ranging between its input voltage
and 36V, using an external resistor network.
The MIC2571 has a fixed switching frequency of 20kHz. An
external SYNC connection allows the switching frequency to
be synchronized to an external signal.
The MIC2571 requires only four components (diode, induc-
tor, input capacitor and output capacitor) to implement a
boost regulator. A complete regulator can be constructed in
a 0.3 in
2
area.
All versions are available in an 8-lead MSOP with an operat-
ing range from –40°C to +85°.
Features
• Operates from a single-cell supply
0.9V to 15V operation
• 120µA typical quiescent current
• Complete regulator fits 0.3 in
2
area
• 2.85V/3.3V/5V selectable output voltage (MIC2571-1)
• Adjustable output up to 36V (MIC2571-2)
• 1A current limited pass element
• Frequency synchronization input
• 8-lead MSOP package
Applications
Pagers
LCD bias generator
Battery-powered, hand-held instruments
Palmtop computers
Remote controls
Detectors
Battery Backup Supplies
Typical Applications
L1
150µH
8
D1
MBR0530
5V/5mA
8
L1
150µH
D1
MBR0530
3.3V/8mA
IN
SW
1V to1.5V
1 Cell
C1*
47µF
16V
2.85V
MIC2571-1
SYNC
7
1
6
5
4
IN
SW
1V to1.5V
1 Cell
C2
47µF
16V
C1*
47µF
16V
2.85V
MIC2571-1
SYNC
7
1
6
5
4
3.3V
5V
GND
2
3.3V
5V
GND
2
C2
47µF
16V
* Needed if battery is
4" from MIC2571
Circuit size < 0.3 in
2
excluding C1
* Needed if battery is
4" from MIC2571
Circuit size < 0.3 in
2
excluding C1
Single-Cell to 5V DC-to-DC Converter
Single-Cell to 3.3V DC-to-DC Converter
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
1997
1
MIC2571