MC33091A Datasheet, PDF (1/16 Pages) Motorola, Inc – HIGH–SIDE TMOS DRIVER

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High-Side TMOS Driver
The MC33091A is a High–Side TMOS Driver designed for use in harsh
automotive switching applications requiring the capability of handling high
voltages attributed to load and field dump transients, as well as reverse and
double battery conditions. Few external components are required to drive a
wide variety of N–Channel TMOS devices. The MC33091A, driving an
appropriate TMOS device, offers economical system solutions for high–side
switching large currents. The MC33091A has CMOS compatible input
control, charge pump to drive the TMOS power transistor, basic fault
detection circuit, VDS monitoring circuit used to detect a shorted TMOS load,
and overcurrent protection timer with associated current squaring circuitry.
Short circuit protection is made possible by having a unique VDS voltage
to current converter drive an externally programmable integrator circuit. This
circuit affords fast detection of a shorted load while allowing difficult loads,
such as lamps having high in–rush currents, additional time to turn on.
The Fault output is comprised of an open collector NPN transistor
requiring a single pull–up resistor for operation. A fault is reported whenever
the MOSFET on–current exceeds an externally programmed set level.
The MC33091A is available in the plastic 8–Pin DIP package as well as
the plastic 8–Pin surface mount package.
• Designed for Automotive High–Side Driver Applications
• Works with a Wide Variety of N–Channel Power MOSFETs
• Drives Inductive Loads with No External Clamp Circuitry Required
• CMOS Logic Compatible Input Control
• On–Board Charge Pump with No External Components Required
• Shorted Load Detection and Protection
• Forward Overvoltage and Reverse Battery Protection
• Load and Field Dump Protection
• Extended Operating Temperature Range
• Fault Output to Report a MOSFET Overcurrent Condition
MC33091A
HIGH–SIDE
TMOS DRIVER
SEMICONDUCTOR
TECHNICAL DATA
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
Simplified Block Diagram
+VS
RX
RS
2 DRN
CS
5 VCC
MC33091A
Input
7+
Overvoltage
Shutdown
Charge
Pump
Current
Squaring
Circuit
ISQ
Fault
6
QS
+
+
QR
+
Gate
4
SRC
1
Load
3 Gnd
8 VT
RT
CT
This device contains 54 active transistors.
MOTOROLA ANALOG IC DEVICE DATA
PIN CONNECTIONS
SRC 1
DRN 2
Gnd 3
Gate 4
8 VT
7 Input
6 Fault
5 VCC
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC33091AD
SO–8
MC33091AP ^{TA = – 40° to +125°C} Plastic DIP
© Motorola, Inc. 1996
Rev 0
1