CR250 | Alternator regulator for 28 V systems

22.0 – 31.0 V set voltage output voltage stabilized to constant value

CR250 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 LIN commands, the output voltage can be set to any desired value within the given range.

Benefits

Fully integrated alternator regulator

LIN single wire interface

Load response function

Technical Features


Type	Voltage regulator for 28 V alternators
Package	Bare-die
Robustness of operation	Wake-up from V terminal if communication is missing
Functions to protect alternator and battery	Default operation if COM pin is disconnected or shorted to B+ or GND Power stage shutdown at extreme temperature Short circuit protection / recovery on DF power stage and on COM
Features	High-side DMOS regulated dynamo field (DF) by fixed frequency PWM Integrated active freewheeling MOSFET on DF DF duty cycle range up to 100 % LR Boost and fast loads Active handling of over-voltage
Communication features	LIN2.1 physical interface (12 V and 24 V) LIN2.1 and LIN1.3 compatible data link layer
Operating voltage	13 – 36 V
Extended operating voltage	8 – 54 V
Set voltage bzw. B+	22.0 – 31.0 V
Setting	LIN
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]	175°C

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