MCP1259T-E/UN

Voltage Regulators - DC DC Switching Regulators Overview

The MCP1259T-E/UN is a Microchip Technology switching voltage regulator belonging to the MCP125x series. It functions as an inductorless positive voltage regulating charge pump DC-DC converter. The device utilizes a 1.5x/2x boost topology to convert input voltages ranging from 1.8 V to 3.6 V into a stable 3.3 V output. Key electrical parameters include a maximum output current of 100 mA, a fixed switching frequency of 650 kHz, and a typical quiescent current of 250 nA in active mode. It features a low-power shutdown mode with typical current consumption of 0.1 µA. The component operates within a temperature range of -40°C to +125°C and is housed in a 10-pin MSOP package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates bypass mode for direct input-to-output connection to minimize power consumption for peripheral biasing
• Includes automatic mode switching between 1.5x and 2x boost topologies based on input voltage conditions
• Provides power good indication and low-power sleep mode functionality

Voltage Regulators - DC DC Switching Regulators Applications

• Bias power supplies for microcontrollers (MCU)
• Portable instrumentation powered by alkaline or NiMH batteries
• Home automation products requiring efficient step-up conversion
• Real-time clock (RTC) bias circuits via bypass mode

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against official datasheets to confirm feature sets, as variations exist within the family. Confirm AEC-Q100 qualification status if automotive compliance is required. Ensure compatibility with the MSOP-10 package dimensions during PCB layout. Cross-reference manufacturer documentation for humidity sensitivity handling requirements prior to assembly.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact, inductorless solution is needed for boosting single-cell lithium or dual-cell alkaline battery voltages. Consider the integrated bypass mode if maintaining RTC or MCU bias during low-input conditions is critical. Evaluate the 650 kHz switching frequency against EMI constraints. Compare against MCP1258 if bypass functionality is not required but other specifications remain similar.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the MCP125x series of charge pump regulators designed for portable applications. It shares core architecture with siblings like MCP1256, MCP1257, and MCP1258, differing primarily in control features such as sleep versus bypass modes. The series targets efficiency improvements in battery-powered devices where space and component count are constrained.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

MCP1258T-E/UN offers similar electrical characteristics but includes bypass mode instead of sleep mode. MCP1256T-E/UN provides sleep mode but lacks bypass functionality. Verify pinout and feature compatibility before substitution.