The MCP1257 is inductorless, positive regulated charge pump DC/DC converters. The devices generate a regulated 3.3V output voltage from a 1.8V to 3.6V input. The devices are specifically designed for applications operating from 2-cell alkaline, Ni-Cd, or Ni-MH batteries or by one primary lithium MnO2 (or similar) coin cell battery. The MCP1257 provide high efficiency by automatically switching between 1.5x and 2x boost operation. In addition, at light output loads, the MCP1256 and MCP1257 can be placed in a SLEEP mode, lowering the quiescent current while maintaining the regulated output voltage. In normal operation, the output voltage ripple is below 20 mVPP at load currents up to 100 mA. Normal operation occurs at a fixed switching frequency of 650 kHz, avoiding interference with sensitive IF bands. The MCP1256 and MCP1258 feature a power-good output that can be used to detect out-of-regulation conditions. The MCP1257 and MCP1259 feature a lowbattery indication that issues a warning if the input voltage drops below a preset voltage threshold. Extremely low supply current and few external parts (4 capacitors) make these devices ideal for small, batterypowered applications. A Shutdown mode is also provided for further power reduction. The devices incorporate thermal and short-circuit protection. Two package offerings are provided: 10-pin MSOP and 10-lead 3 mm x 3 mm DFN. The devices are completely characterized over the junction temperature range of -40°C to +125°C.