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Bosch Semiconductors for Automotive

CR298

Alternator regulator for 28V systems

Application & Technical Summary

CR298

CR298 regulates the output voltage of a 28 V alternator to a constant value.

The regulator continuously senses the alternator’s output voltage, rpm, temperature, excitation current. It adjusts the excitation current to keep the output voltage on a constant level.

Product benefits

  • Fully integrated alternator regulator
  • MFR Multi functional regulator

28.3 V regulation voltage

output voltage stabilized to constant value

Technical Features

Type
Voltage regulator for 28V alternators
Package
MultiWatt8
Robustness of operation

  • Self start from V terminal
    Power stage shutdown at extreme temperature
  • Short circuit protection / recovery on DF

Features

  • High-side DMOS regulated dynamo field (DF) by fixed frequency PWM
  • Integrated freewheeling diode on DF
  • DF duty cycle range up to 100 %
  • Active handling of over-voltage

Operating voltage
16 - 36V
Extended operating voltage
8 - 54 V
Set voltage or B+
28.3 V
Setting
fixed
Regulation
analog
Freewheeling
passive
Load response
no
ESD handling
all pins :±8 kV (HBM, 1.5 kOhm, 100 pF to GND) except DFM ±2 kV
Field protection
yes
Tj min [°C]
-40°C
Tj max [°C]
150°C

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