MIC2571

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 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. All versions are available in an 8-lead MSOP with an operating 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...