LTC3402EMS - High Efficiency, 2.25MHz Synchronous Step-Down Regulator

The LTC3402EMS is a versatile and compact synchronous step-down regulator from Linear Technology, designed to deliver high efficiency and excellent performance for portable applications. This regulator is capable of providing up to 600mA of continuous output current from a 2.5V to 5.5V input range, making it an ideal choice for single-cell Li-Ion or multi-cell alkaline/NiMH applications.

One of the standout features of the LTC3402EMS is its high switching frequency of 2.25MHz, which allows the use of tiny, low-cost capacitors and inductors less than 2mm in height. This high frequency combined with a constant frequency/controlled on-time architecture ensures low, predictable output ripples over a wide range of loads and input voltages, contributing to stable operation and simplified filtering requirements.

The LTC3402EMS integrates main and synchronous power switches, which significantly enhance efficiency by reducing the need for an external Schottky diode. The regulator's efficiency is further optimized with a Burst Mode® operation, which reduces quiescent current to just 25µA during light load conditions, thereby extending battery life in portable devices. For noise-sensitive applications, the LTC3402EMS can be configured to operate in a pulse-skipping mode, which reduces noise and RF interference.

Additional features of the LTC3402EMS include a 0.8V reference that allows low output voltages, internal soft-start to limit inrush current during startup, and a Power Good flag that indicates when the output is within 10% of its regulated voltage. The device also offers protection against over-temperature and over-current conditions, ensuring reliable performance under a variety of circumstances.

The LTC3402EMS comes in a compact 10-lead MSOP package, which is ideal for space-constrained applications such as handheld devices, digital cameras, and other portable electronics. With its combination of high efficiency, small footprint, and robust feature set, the LTC3402EMS is an excellent power management solution for designers looking to optimize their products for size, performance, and battery life.