LTC1682IMS8-3.3

The LTC1682IMS8-3.3 is a doubler charge pump integrated circuit from Linear Technology (LT) designed for low noise applications. It features an internal low dropout (LDO) linear regulator that converts a boosted output from the charge pump into a low noise regulated supply. This device is suitable for powering noise-sensitive components such as high-frequency VCOs in wireless applications.

Key electrical specifications include a fixed output voltage of 3.3V, an adjustable output voltage range of 2.5V to 5.5V, and a wide input voltage range from 1.8V to 4.4V. It can deliver up to 50mA of output current and operates at a switching frequency of 550kHz. The device exhibits low output noise of 60mVRMS (100kHz BW) and low operating current of 150mA, with a shutdown current of only 1mA.

The LTC1682IMS8-3.3 utilizes small ceramic capacitors and requires no inductors, reducing board space. It is available in an 8-pin MSOP or SO package, supporting surface mount applications. The IC includes internal thermal shutdown and current limiting for protection.

This charge pump is ideal for applications requiring a clean, boosted power supply, such as VCO power supplies in cellular phones, 2-way pagers, wireless PCMCIA cards, portable medical instruments, low power data acquisition systems, and remote transmitters.