Switch Mode Power Supply with Multiple Linear Regulators and High Speed CAN Transceiver

The 33394 is a multi–output power supply integrated circuit with high speed CAN transceiver. The IC incorporates a switching pre–regulator operating over a wide input voltage range from +4.0V to +26.5V (with transients up to 45V).

Additional features include Active Reset circuitry watching VDDH, VDD3_3, VDDL and VKAM, user selectable Hardware Reset Timer (HRT), Power Sequencing circuitry guarantees the core supply voltages never exceed their limits or polarities during system power up and power down.

A high speed CAN transceiver physical layer interfaces between the microcontroller CMOS outputs and differential bus lines. The CAN driver is short circuit protected and tolerant of loss of battery or ground conditions.

33394 is designed specifically to meet the needs of modules, which use the MPC565 microcontroller, though it will also support others from the MPC5XX family of Motorola microcontrollers.

Features:

• Wide operating input voltage range: +4.0V to +26.5V (+45V transient).

• Provides all regulated voltages for MPC5XX MCUs and other ECU’s logic and analog functions.

• Accurate power up/down sequencing.

• Provides necessary MCU support monitoring and fail–safe support.

• Provides three 5.0 V buffer supplies for internal & external (short–circuit protected) sensors.

• Includes step–down/step–up switching regulator to provide supply voltages during different battery conditions.

• Interfaces Directly to Standard 5.0V I/O for CMOS Microprocessors by means of Serial Peripheral Interface.