STEF4S中文资料3.3V和5V线路的eFuse（电子熔断器）数据手册ST规格书

描述 Description

The STEF4S is an integrated electronic fuse optimized for monitoring the output current and the input voltage. It can be connected in series to 3.3 V or 5 V rails, protecting the electronic circuitry on its output from overcurrent and overvoltage. The operating mode (5 V or 3.3 V) can be selected by a dedicated pin. The STEF4S has a controlled turn-on time, adjustable by an external capacitor. When an overload condition occurs the device limits the output current to a predefined safe value. If the anomalous overload condition persists it goes into an open state, disconnecting the load from the power supply. If a continuous short-circuit is present on the board, the E-fuse limits the output current to a safe value.

In case of overvoltage on the input, the device clamps the output voltage to a predefined value and protects the load.

If the anomalous fault condition persists, the internal thermal protection circuit shuts down the device and then automatically attempts to re-supply the load until the fault condition is removed.

Unlike mechanical fuses, which must be physically replaced after a single event, the E-fuse does not degrade in its performance after short-circuit/thermal protection interventions.

特性 Features

• Power MOSFET on-resistance (typ.): 40 mΩ
• Enable function
• Output clamp voltage (typ.): 5.7 V in 5 V mode, and 3.8 V in 3.3 V mode
• Undervoltage lockout
• Short-circuit limit
• Overload foldback current limit
• Controlled soft-start
• Thermal auto-retry
• Internal sensing FET
• Operative temp. range: - 40 °C to 85 °C
• Available in DFN 3x3 10L package
• Hard disk drives
• Solid state drives (SSD)
• Hard disk and SSD arrays
• Set-top boxes
• DVD and blu-ray disc drivers

简介

STEF4S属于集成电路（IC）的电流调节/管理。由制造生产的STEF4S电流调节/管理电流调节和管理 IC 是用于监视和调节电路电流的半导体器件。功能包括电流表、限流、电流镜、电流监控器、电流调节器、电流纹波抑制器、电流检测、电流源、电流开关和电子保险丝，电流输出从 100 μA 至 50 A 可调。