MIC2570 Micrel, Inc. MIC2570
Two-Cell Switching Regulator General Description Features Micrel’s MIC2570 is a micropower boost switching regulator
that operates from two alkaline, two nickel-metal-hydride
cells, or one lithium cell. Operates from a two-cell supply
1.3V to 15V operation 130ВµA typical quiescent current Complete regulator п¬Ѓts 0.6 in2 area 2.85V/3.3V/5V selectable output voltage (MIC2570-1) Adjustable output up to 36V (MIC2570-2) 1A current limited pass element Frequency synchronization input 8-lead SOIC package The MIC2570 accepts a positive input voltage between 1.3V
and 15V. Its typical no-load supply current is 130ВµA.
The MIC2570 is available in selectable fixed output or adjustable output versions. The MIC2570-1 can be configured
for 2.85V, 3.3V, or 5V by connecting one of three separate
feedback pins to the output. The MIC2570-2 can be configured for an output voltage ranging between its input voltage
and 36V, using an external resistor network. Applications The MIC2570 has a п¬Ѓxed switching frequency of 20kHz. An
external SYNC connection allows the switching frequency to
be synchronized to an external signal. The MIC2570 requires only four components (diode, inductor,
input capacitor and output capacitor) to implement a boost
regulator. A complete regulator can be constructed in a 0.6
in2 area.
All versions are available in an 8-lead SOIC with an operating
range from –40°C to +85°. LCD bias generator
Glucose meters
Single-cell lithium to 3.3V or 5V converters
Two-cell alkaline to В±5V converters
Two-cell alkaline to –5V converters
Battery-powered, hand-held instruments
Palmtop computers …