STEF033 datasheet(1/25 Pages) STMICROELECTRONICS

部件名	STEF033

功能描述	Electronic fuse for 3.3 V line

PDF	25 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 25 page

This is information on a product in full production.

January 2015

DocID025099 Rev 2

1/25

STEF033

Electronic fuse for 3.3 V line

Datasheet

- production data

Features

• Continuous current typ.: 3.6 A (DFN), 2.5 A

(Flip Chip)

• N-channel on resistance (typ): 40 mΩ (DFN),

25 m

Ω (Flip Chip)

• Enable/Fault functions

• Output clamp voltage (typ): 4.5 V

• Undervoltage lockout

• Short-circuit limit

• Overload current limit

• Controlled output voltage ramp

• Thermal latch (typ): 160 °C

• Uses tiny capacitors

• Latching and auto-retry versions

• Operative junction temp. - 40 °C to 125 °C

• Available in DFN10 3x3 and Flip Chip 9 bumps

Applications

• Hard disk drives

• Solid state drives (SSD)

• Hard disk and SSD arrays

• Computer

• DVD and Blu-Ray disc drivers

Description

The STEF033 is an integrated electronic fuse

optimized for monitoring output current and the

input voltage. Connected in series to the 3.3 V

rail, it is able to protect the electronic circuitry on

its output from overcurrent and overvoltage. The

STEF033 has controlled delay and turn-on time.

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, when the

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

output current to a safe value and then goes

again into the open state. The voltage clamping

circuit prevents the output voltage from exceeding

a fixed value, if the input voltage goes beyond this

threshold. The device is equipped with a thermal

protection circuit. Intervention of thermal

protection is signaled to the board-monitoring

circuits through an appropriate 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 performances

following short-circuit/thermal protection

intervention and is reset either by re-cycling the

supply voltage or using the appropriate Enable

pin. The STEF033 is also available in an auto-

retry version; in case of thermal fault it

automatically attempts to re-apply power to the

load when the die temperature returns to a safe

value.

DFN10 (3 x 3 mm)

Flip Chip 9

www.st.com

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类似说明 - STEF033

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