UC3901DW

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The UC3901DW is an integrated power management and protection circuit integrated into a single 9-pin SOP package. The UC3901DW incorporates a dual current-limited switched-mode power supply (SMPS) controller, a 5 V/3.3 V linear regulator, an Error amplifier and various protections, such as thermal shut down, and over-voltage, under-voltage and overtemperature protection. The UC3901DW is an ideal solution for power management for lower-power applications such as PC hard disk, laser printer and optical drive applications.

The UC3901DW is a dual current-limited switched-mode power supply (SMPS) controller that provides flexibility and wide input voltage range. It features advanced power MOSFETs to achieve high efficiency with low standby current while minimizing external components. This cutting-edge device is designed to operate with a minimum number of external components and provides a variety of features, such as active current foldback compensation and programmable over-voltage protection.

The UC3901DW is designed to sense the voltage on the VREF pin, allowing either negative or positive going ramp rates, providing flexibility for faster ramp-up or ramp-down for the power supply’s output voltage. The UC3901DW implements unique current limit protection schemes, including adaptive-on-time, foldback-mode and programmable over-current protection, which helps prevent damaging over-current situations.

The UC3901DW includes dual linear regulators for the 5 V/3.3 V output. The low-dropout (LDO) output voltages are adjustable from 2.3 V to 5.5 V, and the current limit can be programmed up to 1.8 A. The 5 V output of the UC3901DW is designed to be the primary output of the SMPS, while the 3.3 V output can be used to supply an extra power rail that is lower than the 5 V rail, providing additional protection to the system.

The UC3901DW also includes an Error amplifier, which allows the user to select an appropriate reference voltage to optimize efficiency and minimize output voltage ripple. Additionally, the Error amplifier allows the user to adjust the output voltage setpoint and gain.

The UC3901DW also provides comprehensive protections. It has a dual-trip point thermal shut down protection, with the low-trip threshold temperature adjustable from 20°C to 120°C and the high-trip threshold temperature adjustable from 110°C to 160°C. The UC3901DW also has adjustable under-voltage and over-voltage protections, so the user can set the limits to suit the application.

The UC3901DW is an excellent solution for efficient power management and protection in low-power applications. It offers high efficiency with low standby current, a wide input voltage range, programmable over-voltage protection and current limiting, adjustable LDO output voltage and a dual-trip point thermal shut-down protection. The UC3901DW is the ideal choice for PC hard disk, laser printer and optical drive applications.

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