Freescale Semiconductor, Inc.
MOTOROLA
Document order number: MC33099
Rev 4.0, 07/2004
SEMICONDUCTOR TECHNICAL DATA
33099
Adaptive Alternator Voltage
Regulator
The 33099 is designed to regulate the output voltage in diode-rectified
alternator charging systems common to automotive applications. The 33099
provides either an analog or digital fixed frequency duty cycle (ON/OFF ratio)
control of an alternator’s field current. Load Response Control (LRC) of the
alternator field current is accomplished by selecting the duty cycle for
prevailing engine conditions to eliminate engine speed hunting and vibrations
caused by abrupt torque loading of the engine owing to sudden electrical loads
being applied to the system at low engine RPM. Four LRC rates are
selectable.
ALTERNATOR VOLTAGE
REGULATOR
The 33099 uses a feedback voltage to establish an alternator field current
that is in harmony with system load currents. The output voltage is monitored
by an internal voltage divider scheme and compared to an internal voltage
ramp referenced to a bandgap voltage. This approach provides precision
output voltage control over a wide range of temperature, electrical loads, and
engine RPM.
DW SUFFIX
CASE 751G-04
16-TERMINAL SOICW
Features
• External High-Side MOSFET Control of a Ground-Referenced Field
Winding
• LRC Active During Initial Start
ORDERING INFORMATION
Temperature
Device
Package
Range (T )
• V at ±0.1 V @ 25°C
set
A
• <0.1 V Variation Over Engine Speeds of 2,000 to 10,000 RPM
• <0.2 V Variation Over 10% to 95% of Maximum Field Current
• Controlled MOSFET and Field Flyback Diode Recovery Characteristics
for Minimum RFI
MC33099DW/R2
MC33099CDW/R2
-40°C to 125°C
16 SOICW
• Trimmed Devices Available at 14.6 V and 14.8 V (typical) V
set
33099 Simplified Application Diagram
Simplified Application Diagram
33099
PHASE
FIELD
WINDING
GATE
SOURCE
PHASE FILTER
IGN
IGNITION
SWITCH
LAMP DRAIN
BAT
REMOTE
LRC1
LRC2
AGND
GND
CHASSIS
For More Information On This Product,
Go to: www.freescale.com
© Motorola, Inc. 2004