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PDF MIC2571 Data sheet ( Hoja de datos )
| Número de pieza | MIC2571 | |
| Descripción | Single-Cell Switching Regulator Preliminary Information | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC2571 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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MIC2571
Micrel
MIC2571
Single-Cell Switching Regulator
Preliminary 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 in2 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 in2 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
1V to1.5V
1 Cell
C1*
47µF
16V
L1
150µH
8
IN
SW 1
2.85V 6
MIC2571-1 3.3V 5
5V 4
SYNC GND
72
D1
MBR0530
5V/5mA
C2
47µF
16V
* Needed if battery is ≥ 4" from MIC2571
Circuit size < 0.3 in2 excluding C1
Single-Cell to 5V DC-to-DC Converter
1V to1.5V
1 Cell
C1*
47µF
16V
L1
150µH
8
IN
SW 1
2.85V 6
MIC2571-1 3.3V 5
5V 4
SYNC GND
72
D1
MBR0530
3.3V/8mA
C2
47µF
16V
* Needed if battery is ≥ 4" from MIC2571
Circuit size < 0.3 in2 excluding C1
Single-Cell to 3.3V DC-to-DC Converter
4-76
1997
1 page  
MIC2571
Block Diagrams
VBATT
IN
0.22V
Reference
Micrel
SYNC
Oscillator
MIC2571-1
Driver
SW
VOUT
VBATT
5V 3.3V 2.85V
GND
Selectable Voltage Version with External Components
IN
0.22V
Reference
SYNC
Oscillator
MIC2571-2
Driver
SW
FB GND
Adjustable Voltage Version with External Components
VOUT
4-80
1997
5 Page 
MIC2571
Suggested Manufacturers List
Inductors
Coilcraft
1102 Silver Lake Rd.
Cary, IL 60013
PH (708) 639-2361
FX (708) 639-1469
Coiltronics
6000 Park of Commerce Blvd.
Boca Raton, FL 33487
PH (407) 241-7876
FX (407) 241-9339
Sumida
637 E. Golf Road, Suite 209
Arlington Heights, IL
PH (708) 956-0666
FX (708) 956-0702
Capacitors
AVX Corp.
801 17th Ave. South
Myrtle Beach, SC 29577
PH (803) 448-9411
FX (803) 448-1943
Sanyo Video Components Corp.
2001 Sanyo Ave.
San Diego, CA 92173
PH (619) 661-6835
FX (619) 661-1055
Sprague Electric
Lower Main Street
60005Sanford, ME 04073
PH (207) 324-4140
Diodes
General Instruments (GI)
10 Melville Park Rd.
Melville, NY 11747
PH (516) 847-3222
FX (516) 847-3150
International Rectifier Corp.
233 Kansas St.
El Segundo, CA 90245
PH (310) 322-3331
FX (310) 322-3332
Motorola Inc.
3102 North 56th St.
MS 56-126
Phoenix, AZ 85018
PH (602) 244-3576
FX (602) 244-4015
Evaluation Board Layout
Micrel
Component Side and Silk Screen (Not Actual Size)
Solder Side and Silk Screen (Not Actual Size)
4-86
1997
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MIC2571.PDF ] | |
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