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Bosch Semiconductors for Automotive

CR719

Alternator regulator for 14V systems

Application & Technical Summary

CF190

CR719 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.

Product benefits

  • Fully integrated alternator regulator
  • MFR Multi functional regulator
  • Load response function
  • Available in Multiwatt8 or bare die

14.55 V regulation voltage

output voltage stabilized to constant value (CR719N: 14.25 V)

Technical Features

Type
Voltage regulator for 14V alternators
Package
MultiWatt8
Robustness of operation

Self start from V terminal
Functions to protect alternator and battery

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

Features

  • Short circuit protection / recovery on DF power stage
  • High-side DMOS regulated dynamo field (DF) by fixed
    frequency PWM
  • Integrated freewheeling diode on DF
  • DF duty cycle range up to 100 %
  • LR Boost and fast loads
  • Active handling of over-voltage
  • Accepts jump start with 28 V

Operating voltage
7.5 – 24 V
Extended operating voltage
4 – 24 V
Set voltage or B+
14.55 V or 14.25 V
(CR719N)
Setting
Fixed
Regulation
Analog
Freewheeling
Passive
Load response
Yes
High temperature shut-off
Yes
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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