33099 Datasheet, PDF (1/18 Pages) Freescale Semiconductor, Inc – Adaptive Alternator Voltage Regulator

Freescale Semiconductor
Technical Data
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 by connecting pins 7 and 8 to ground.
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.
Features
• External High-Side MOSFET Control of a Ground-Referenced
Field Winding
• LRC Active During Initial Start
• V_set at ±0.1 V @ 25°C
• <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
• Trimmed Devices Available at 14.6 V and 14.8 V (typical) V_set
• Pb-Free Packaging Designated by Suffix Code EG
Document Number: MC33099
Rev. 6.0, 1/2007
33099
VOLTAGE REGULATOR
DW SUFFIX
EG SUFFIX (PB-FREE)
98ASB42567B
16-PIN SOICW
ORDERING INFORMATION
Device
Temperature
Range (T_A)
Package
MC33099DW/R2
MC33099CDW/R2
MCZ33099EG/R2
MCZ33099CEG/R2
-40°C to 125°C
16 SOICW
16 SOICW
(Pb-FREE)
33099
PHASE
GATE
SOURCE
PHASE FILTER
FIELD
WINDING
IGN
LAMP DRAIN
BAT
REMOTE
LRC1
LRC2
AGND
GND
IGNITION
SWITCH
CHASSIS
Figure 1. 33099 Simplified Application Diagram
© Freescale Semiconductor, Inc., 2007. All rights reserved.