General Description

The AS8444 is a complete and fully protected PWM DC motor driver/controller, which could be implemented by interfacing a low cost 8-bit µP and a high-side N-channel power FET switch.

Key Features

- Programmable PWM DC Motor Driver / Controller with µP Interface (Three Wire Interface)

- Programmable Functions and Parameters for Motor Current, Voltage and Speed Regulation

- Single Voltage Supply in the range Vbat = 6.0 V to 30 V (Vbat,max = 40 V)

- Total Power Efficiency up to 96

- Low RF Emission within the whole frequency range due to an integrated special EMC compliant driver

- No EMC Filters required

- Driver fulfils EMC Level 5 (CISPR 25)

- Dynamically self-adjusting slew rate regulated switching technology

- Fully protected by programmable failure handling procedures via µP

- Fast Over Current and Over / Under Voltage Detection and Protection, Battery Voltage Monitoring

- External and On Chip Temperature Detection and Protection

- Motor Current and Speed Measurement with a shunt resistor and capability of trimming the chip for an external shunt value

- LIN Bus Interface

- Programmable Parameters:

• EMC compliant Driver Functions

• Over Current, Over / Under Voltage Threshold Values

• Motor Failure Threshold Levels

• Motor Current Measurement Range

• Trimming for the current measurement shunt

• PWM Frequency, Charge Pump Monitor

- Charge Pump to control high side drivers

- Integrated 5 V Power Supply for external components (µP, etc.)

- Standby and Wake-up capability

- Sleep / Wake-up Mode system controlled by the µP and the LIN Bus

- SOIC 28 Package

Applications

- Fan cooler

- Air conditioning

- Fuel pumps

- Water and oil pumps

- General purpose DC Motor Regulators