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Bosch Semiconductors for Automotive

CR260

Alternator regulator for 28V systems

Application & Technical Summary

CR260

CR260 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. Via PWM commands, the output voltage can be set to any desired value within the given range.

Product benefits

  • Fully integrated alternator regulator
  • Pulse–width modulated regulator
  • Available as bare-die

25.4 – 30.6 V set voltage

via PWM interface

Technical Features

Type
Voltage regulator for 28V alternators
Package
Bare-die
Robustness of operation
Wake-up from V terminal if communication is missing
Functions to protect alternator and battery

  • Power stage shutdown at extreme temperature
  • Short circuit protection / recovery on DF power stage

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

Communication features
C-Terminal acc. to NISSAN specification
Operating voltage
16 – 36 V
Extended operating voltage
8 – 54 V
Set voltage or B+
25.4 – 30.6 V
Setting
PWM
Regulation
Analog
Freewheeling
Passive
Load response
No
High temperature shut-off
Yes
ESD handling
all pins: ±8 kV (HBM, 1.5 kOhm, 100 pF to GND)
Field protection
Yes
Tj min [°C]
-40°C
Tj max [°C]
175°C

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