PG-DSO-8-27

Type

Package

Marking

IFX91041EJV50

PG-DSO-8-27

I9104150

IFX91041EJV33

PG-DSO-8-27

I9104133

IFX91041EJV

PG-DSO-8-27

I91041V

Data Sheet

2

Rev. 1.01, 2009-10-19

1.8A DC/DC Step-Down Voltage Regulator

IFX91041

1Overview

•

1.8A step down voltage regulator

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Output voltage versions: 5.0 V, 3.3 V and adjustable

•

± 2% output voltage tolerance (+-4% for full load current range)

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Integrated power transistor

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PWM regulation with feedforward

•

Input voltage range from 4.75V to 45V

•

370 kHz switching frequency

•

Synchronization input

•

Very low shutdown current consumption (<2uA)

•

Soft-start function

•

Input undervoltage lockout

•

Suited for industrial applications:

T

•

Green Product (RoHS compliant)

For automotive and transportation applications, please refer to the Infineon TLE and TLF voltage regulator series.

Description

The IFX91041 series are monolithic integrated circuits that provide all active functions for a step-down (buck)

switching voltage regulator, capable of driving up to 1.8A load current with excellent line and load regulation.

These devices are suited for use under the harsh automotive electronics environmental conditions featuring

protection functions such as current limitation and overtemperature shutdown. Versions with a fixed 5.0V and 3.3V

(IFX91041EJV50, IFX91041EJV33) output voltage as well as an adjustable device (IFX91041EJV) with 0.60V

reference feedback voltage are available. The switching frequency of 370kHz allows to use small and inexpensive

passive components. The IFX91041 features an enable function reducing the shut-down current consumption

to <2uA. The voltage mode regulation scheme of this device provides a stable regulation loop maintained by small

external compensation components. Besides the feedforward control path offers an excellent line transient

rejection. The integrated soft-start feature limits the current peak as well as voltage overshot at start-up.