IC-MFP datasheet(2/13 Pages) ICHAUS

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iC-MFP

8-FOLD FAIL-SAFE P-FET DRIVER

Rev A2, Page 2/13

DESCRIPTION

iC-MFP is a monolithically integrated, 8-channel

inverting level adjustment device which drives P-

channel FETs. The internal circuit blocks have been

designed in such a way that with single errors, such

as open pins (VB, VBR, GND, GNDR) or the short-

circuiting of two outputs, iC-MFP’s output stages

switch to a predeﬁned, safe high state. Externally

connected P-channel FET are thus shut down safely

in the event of a single error.

The inputs of the eight channels consist of a Schmitt

trigger with a pull-down current source and are com-

patible with TTL and CMOS levels and are voltage-

proof up to 40 V. The eight channels have a current-

limited push-pull output stage and a pull-up resistor

at the output. The hi-level at one of the inputs EN5,

EN10 or ENFS deﬁnes the output lo-level VB - 5 V,

VB - 10 V or GND voltage and enables the outputs.

The output lo-level is disabled with the lo-level at all

inputs EN5, EN10 and ENFS or with the hi-level at

more than one input.

iC-MFP monitors the supply voltage at VB and VBR

pin and the voltages at the two ground pins GND and

GNDR. Both power supply pins VB and VBR and

both pins GND and GNDR must be connected to-

gether externally in order to guarantee the safe high

state of the output stages in the event of error.

Should the supply voltage at VB undershoot a prede-

ﬁned threshold, the voltage monitor causes the out-

puts to be actively tied to VB via the highside transis-

tors. If the supply voltage ceases to be applied to VB,

the outputs are tied to VBR by pull-up resistors.

If the connection between the ground potential and

the GND or GNDR pin is disrupted, the highside tran-

sistors are activated.

Pull-down currents provide the safe lo-level at open

inputs IN1. . . 8, EN5, EN10 and ENFS. The pull-

down currents have two stages in order to minimize

power dissipation with enhanced noise immunity.

When two outputs of different logic states are short

circuited, the driving capability of the highside driver

predominates, keeping the connected P-channel

FETs in a safe shutdown state.

The status of the device is indicated with the Open-

Drain pin NOK and can be used for system diagnos-

tics.

Temperature monitoring protects the device from too

high power dissipation.

The device is protected against destruction by ESD.

IC-MFP Datasheet(PDF) 2 Page - IC-Haus GmbH

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