STEF4S datasheet(1/21 Pages) ETC2

Part #	STEF4S

Description	Electronic fuse for 3.3 V and 5 V lines

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Manufacturer	ETC2 [List of Unclassifed Manufacturers]

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This is information on a product in full production.

October 2013

DocID025259 Rev 1

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21

STEF4S

Electronic fuse for 3.3 V and 5 V lines

Datasheet

- production data

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

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 pe rsists, 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.

Applications

• Hard disk drives

• Solid state drives (SSD)

• Hard disk and SSD arrays

• Set-top boxes

• DVD and blu-ray disc drivers

Table 1. Device summary

Order code

Package

Packing

STEF4SPUR

DFN 3x3 10L

Tape and reel

www.st.com

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