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Bosch Semiconductors

CR636

Alternator regulator for 14V systems with RVC interface

Application & Technical Summary

CR298

CR636 regulates the output voltage of a 14 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
  • Load response function
  • Multiwatt8 package or bare die
  • Various customer programming options at end of line

11.0 – 15.5 V set voltage

via PWM interface

Technical Features

Type
Voltage regulator for 14V alternators
Package
MultiWatt8
Robustness of operation
Wake-up from V terminal if communication is missing
Function 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 active freewheeling MOSFET on DF
  • DF duty cycle range up to 90 %
  • LR slow loads
  • LR Boost and fast loads
  • Active handling of over-voltage
  • Accepts jump start with 28 V

Communication features
RVC interface acc. to GM specification GMW14036 + Update GMW8778
Operating voltage
6.5 – 18 V
Extended operating voltage
4 – 37 V
Set voltage or B+
11.0 – 15.5 V
Setting
PWM
Regulation
Digital
Freewheeling
Active
Load response
Yes
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]
150°C

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