Texas Instruments

LM2681M6X

LM2681M6X Description

The LM2681M6X is a fixed-output charge pump voltage regulator from Texas Instruments, designed to provide a compact and efficient solution for low-power voltage conversion. Operating within an input voltage range of 2.5V to 5.5V, it delivers a regulated output of 2Vin or Vin/2, making it suitable for ratiometric applications. With a switching frequency of 80kHz, this IC ensures stable performance while minimizing external component count. Packaged in a SOT-23-6 form factor and available in Tape & Reel (TR), it is optimized for surface-mount assembly in space-constrained designs.

LM2681M6X Features

• Ratiometric Output: Provides 2Vin or Vin/2 for precise voltage scaling in sensor and measurement systems.
• Low Input Voltage Range: Operates from 2.5V to 5.5V, ideal for battery-powered and portable devices.
• Compact Design: SOT-23-6 package saves board space and simplifies layout.
• No Synchronous Rectifier Needed: Reduces complexity and cost compared to buck/boost converters.
• Low Output Current (20mA): Optimized for low-power applications such as signal conditioning and bias generation.
• 80kHz Switching Frequency: Balances efficiency and noise performance for sensitive circuits.

LM2681M6X Applications

• Sensor Interfaces: Ratiometric output is ideal for bridge sensors, strain gauges, and pressure sensors.
• Portable Electronics: Efficiently powers low-voltage logic, displays, and analog circuits in handheld devices.
• Battery-Powered Systems: Suitable for energy harvesting, IoT nodes, and wearables due to low quiescent current.
• Signal Conditioning: Provides precise voltage scaling for ADC/DAC reference circuits.
• Industrial Controls: Used in 4-20mA loops, instrumentation, and low-noise analog systems.

Conclusion of LM2681M6X

The LM2681M6X stands out as a simple, cost-effective charge pump regulator for low-power voltage conversion. Its ratiometric output, small footprint, and wide input range make it a versatile choice for sensor interfaces, portable electronics, and industrial applications. While now obsolete, its legacy design remains relevant for legacy systems or designs prioritizing minimal external components. Engineers seeking a no-frills voltage doubler/halver with proven reliability will find this IC a practical solution.