Linear Technology LTC1772BIS6 Step-Down Controller

The LTC1772BIS6 is a compact, high-efficiency, Constant Frequency Current Mode PWM step-down DC/DC controller from Linear Technology, designed to make the most of battery life in portable devices. This controller operates at a fixed frequency, which can be set from 550kHz to 2.5MHz, allowing the use of small, low-cost capacitors and inductors with values less than 2.2μH. Its high switching frequency can also enable the use of a smaller transformer in applications that require isolated power supplies.

One of the key features of the LTC1772BIS6 is its low quiescent current draw. With a typical quiescent current of just 120μA, which drops to 10μA in shutdown, this controller is an excellent choice for battery-powered systems where energy efficiency is paramount. This low consumption extends battery life, making it ideal for portable applications.

The device is housed in a compact ThinSOT package, which is suitable for space-constrained applications. It includes an internal 1.25V reference, which allows for an output voltage range from 0.8V to VIN, provided the duty cycle requirements are met. This versatility makes it suitable for a wide range of applications, including PDAs, cellular phones, and other portable devices that require efficient power management.

Additional features of the LTC1772BIS6 include a Burst Mode operation, which enhances efficiency at light loads, and a shutdown mode that reduces the supply current to 10μA. The controller also offers protection features like cycle-by-cycle current limit and thermal shutdown, ensuring reliable operation under various conditions.

In summary, the LTC1772BIS6 from Linear Technology is a versatile, efficient, and space-saving solution for power management in portable devices. Its ability to operate at high frequencies with small external components, coupled with its low power consumption, makes it an excellent choice for designers looking to optimize the battery life and performance of their products.