LT1171CT#PBF

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The LT1171CT#PBF is a microcontroller-compatible switching regulator controller optimized for battery-powered applications. It operates with input voltages as low as 1.8V and up to 15V and is ideal for use in notebooks, tablets, and other battery-powered products. Its advanced control circuitry enables very low quiescent currents and excellent transient response. Its wide output voltage range and adjustable current limit provide flexibility for designs. The LT1171CT#PBF is intended for use as the basis for high efficiency, single-ended flyback, buck, boost, and inverting buck-boost DC-DC Converters.

This device offers several integrated features designed to help minimize external component count and improve efficiency. Its operating frequency is adjustable and can be synchronized to an external clock. The switching frequency is logic-level programmable and can be adjusted from 15kHz to 1MHz. The built-in oscillator has a frequency accuracy of ±2%. Furthermore, when the Chip Enable (CE) pin is asserted, the device automatically enters the shut-down mode, reducing the quiescent current to 400uA.

The LT1171CT#PBF incorporates two PWM comparators with voltage mode control. A dedicated PWM comparator maintains a constant voltage across the output, while a control loop compares the output voltage to the reference voltage and adjusts the PWM output, ensuring stability even when the load current is changing. This device also includes a fast-response current limit circuit and a device protection circuit that protects the device from overvoltage and undervoltage conditions.

The LT1171CT#PBF features an input voltage range of 1.8V to 15V and an output voltage range of 0.8V to the input voltage, with a maximum output current of 5A. The LT1171CT#PBF can supply fixed or adjustable output voltages with a typical efficiency of up to 85%. It offers excellent EMI performance, making it suitable for use in applications where EMI is an issue. It also provides programmable soft-start and short-circuit protection and supports operation in discontinuous conduction mode.

The LT1171CT#PBF is a reliable and efficient choice for a wide range of applications, such as consumer electronics, portable medical devices, and battery-powered applications. Its low power consumption, fast transient response, adjustable frequency, wide input voltage range, and adjustable current limit make it an excellent choice for high efficiency, low power, and reliable power supply designs. It is available in a small PBF-7 package, making it an ideal solution for space-constrained designs.

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