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MIC2571 Datasheet(PDF) 1 Page - MIC GROUP RECTIFIERS |
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MIC2571 Datasheet(HTML) 1 Page - MIC GROUP RECTIFIERS |
1 / 12 page 1997 1 MIC2571 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 120 µA. 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°. Typical Applications Features • Operates from a single-cell supply 0.9V to 15V operation • 120 µA 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 Single-Cell to 5V DC-to-DC Converter IN SW GND MIC2571-1 C2 47µF 16V 5V/5mA C1* 47µF 16V 1V to1.5V 1 Cell 2.85V 3.3V 5V 2 4 5 6 1 7 8 L1 150µH SYNC D1 MBR0530 * Needed if battery is ≥ 4" from MIC2571 Circuit size < 0.3 in2 excluding C1 Single-Cell to 3.3V DC-to-DC Converter IN SW GND MIC2571-1 C2 47µF 16V 3.3V/8mA C1* 47µF 16V 1V to1.5V 1 Cell 2.85V 3.3V 5V 2 4 5 6 1 7 8 L1 150µH SYNC D1 MBR0530 * Needed if battery is ≥ 4" from MIC2571 Circuit size < 0.3 in2 excluding C1 Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com |
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