Linear Technology LTC1735IS High Efficiency Synchronous Step-Down Switching Regulator

The LTC1735IS is a versatile synchronous step-down switching regulator designed by Linear Technology, now part of Analog Devices, to deliver high efficiency and excellent performance in a wide range of applications. This regulator is particularly well-suited for portable and compact devices where power efficiency and board space are at a premium.

The device operates over a wide input voltage range from 4V to 36V, making it ideal for applications powered from a variety of sources, including single-cell and multi-cell batteries, as well as automotive inputs and industrial power supplies. It can deliver output voltages as low as 1.25V with a high level of accuracy, ensuring compatibility with modern low-voltage digital ICs.

One of the key features of the LTC1735IS is its internal synchronous rectification, which provides efficiency as high as 95%. This is achieved through the use of top and bottom N-channel MOSFET switches, which are driven by an onboard boost diode and bootstrap capacitor. The high switching frequency of up to 550kHz allows the use of small, low-cost capacitors and inductors, reducing the overall footprint of the power supply on the PCB.

The LTC1735IS also offers a number of protective features to ensure reliable operation under harsh conditions. These include overvoltage protection, overcurrent protection, and thermal shutdown. Additionally, the device features a soft-start capability that limits inrush current during startup, providing a controlled ramp-up of the output voltage and reducing stress on the power supply components.

For applications that require low power consumption in standby mode, the LTC1735IS offers a Burst Mode operation, which reduces quiescent current and maintains high efficiency at light loads. This feature is particularly useful in battery-powered applications where extending the battery life is critical.

The LTC1735IS is available in a compact 16-lead narrow SSOP package, making it an excellent choice for space-constrained applications. Its robust design, combined with a comprehensive set of features, ensures that the LTC1735IS can meet the stringent requirements of a wide array of power conversion applications.