The Microchip MCP1252/3 are inductorless, positive-regulated charge pump DC/DC converters designed for applications requiring low noise and high efficiency. These devices generate a regulated fixed (3.3V or 5.0V) or adjustable output voltage and can operate in both buck and boost modes. Featuring thermal shutdown and short-circuit protection, the MCP1252/3 are suitable for white LED backlighting, color display bias, flash memory supply voltage, and SIM interface supply in GSM phones. The MCP1252 operates at 650 kHz, while the MCP1253 operates at 1 MHz, allowing for the use of smaller capacitors and saving board space.