Features

•

5 V and 12 V channels into one chip

•

25 V absolute maximum input voltage

•

Precise output over voltage clamp

•

Fixed current limit: 3 A on 5 V, 4 A on 12 V

•

Latched-off thermal protection

•

Input undervoltage lockout

•

Adjustable output voltage slew-rate for each channel

•

Integrated 40 mΩ Power FETs

•

SAS disable pin

•

TSOT23-8L package

Applications

•

HDD and SSD drives

•

Set-top boxes

•

HDD and SSD array

Description

The STEF512GR is an integrated dual electronic fuse, designed to protect circuitry

on its output from overcurrent and overvoltage events, in those applications requiring

hot swap operation and in-rush current control.

The device embeds two independent electronic fuses, one for the 5 V rails and one

for the 12 V rails. Thanks to the very low ON-resistance of the integrated Power

FETs, the voltage drop from the main supply to the load is very low during normal

operations.

The start-up time can be adjusted by the user for each e-fuse, via two small soft-start

capacitors, connected to the relevant pins.

In this manner, the inrush current at startup can be kept under control.

The maximum load current is precisely limited, by utilizing a sense FET topology, to

factory-defined values.

The device also provides a precise overvoltage clamp for each channel, preventing

the load from being damaged by power supply failures, and undervoltage lockout

(UVLO), assuring that the input voltage is above the minimum operating threshold,

before the power device is turned on.

When an overload condition occurs, the STEF512GR limits the output current to the

predefined safe value. If the anomalous overload condition persists, the device goes

into thermal shutdown, the internal switch is opened and the load disconnected from

the power supply.

Maturity status link

STEF512GR

Dual electronic fuse for 5 V and 12 V rails

STEF512GR

Datasheet

DS13212 - Rev 2 - March 2020

For further information contact your local STMicroelectronics sales office.

www.st.com