MIC2571 Micrel MIC2571
Single-Cell Switching Regulator
Final Information General Description Features 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 120ВµA. Operates from a single-cell supply
0.9V to 15V operation 120ВµA 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 The MIC2571 is available in selectable fixed output or adjustable 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 configured 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, inductor, input capacitor and output capacitor) to implement a
boost regulator. A complete regulator can be constructed in
a 0.3 in2 area. Applications Pagers
LCD bias generator
Battery-powered, hand-held instruments
Palmtop computers
Remote controls
Detectors
Battery Backup Supplies All versions are available in an 8-lead MSOP with an operating range from –40В°C to +85В°. Typical Applications D1 …