STEF05 datasheet(1/20 Pages) STMICROELECTRONICS

Part #	STEF05

Description	Electronic fuse for 5 V line

PDF	20 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 20 page

This is information on a product in full production.

March 2012

Doc ID 019055 Rev 4

1/20

20

STEF05

Electronic fuse for 5 V line

Datasheet

− production data

Features

■ Continuous current (typ): 3.6 A

■ N-channel on-resistance (typ): 40 m

Ω

■ Enable/Fault functions

■ Output clamp voltage (typ): 6.65 V

■ Undervoltage lockout

■ Short-circuit limit

■ Overload current limit

■ Controlled output voltage ramp

■ Thermal latch (typ): 165 °C

■ Uses tiny capacitors

■ Operating junction temp. - 40 °C to 125 °C

■ Available in DFN10 (3x3 mm) package

Applications

■ Hard disk drives

■ Solid state drives (SSD)

■ Hard disk and SSD arrays

■ Set-top boxes

■ DVD and Blu-ray disc drivers

Description

The STEF05 is an integrated electronic fuse

optimized for monitoring output current and input

voltage. Connected in series to a 5 V rail, it is

capable of protecting the electronic circuitry on its

output from overcurrent and overvoltage. The

device has a controlled delay and turn-on time.

When an overload condition occurs, the STEF05

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, when power

is re-applied the E-fuse initially limits the output

current to a safe value, and then again goes into

an open state. The device is equipped with a

thermal protection circuit. The intervention of the

thermal protection is signalled to the board

monitoring circuits through a signal on the Fault

pin. 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 and

it is reset either by recycling the supply voltage or

using the Enable pin. The companion chip for

12 V power rails is also available with part number

STEF12.

DFN10 (3x3 mm)

Table 1.

Device summary

Order code

Package

Packaging

STEF05PUR

DFN10 (3x3 mm)

Tape and reel

www.st.com

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