STA6940M

STA6940M Brushed DC Motor Driver IC With PWM Control Features and Benefits ▪ Power supply voltage, VBB , 44 V maximum, 10 to 40 V normal operating range ▪ Logic supply voltage, VDD , 3 to 5.5 V compatible ▪ Output current, IO ,4 A average, 8 A maximum ▪ Output elements are all N-channel MOSFETs to reduce losses ▪ Internal charge pump ▪ Forward, reverse, free, and brake control modes available ▪ Constant-current control: ▫ Off-time 35 μs, fixed (Slow Decay mode) ▪ Internal Overcurrent Protection (OCP) circuitry ▫ Off-time 142 μs fixed (Fast Decay mode) ▪ Internal Thermal Shutdown (TSD) circuitry ▪ ZIP type 18-pin fully-molded package (STA package) Package: 18-pin ZIP (STA) Description Combining low-power CMOS-compatible logic with highcurrent, high-voltage power MOSFET outputs, the STA6940M provides complete control and drive for brush DC motors. It provides internal fixed off time, pulse-width modulation (PWM) control of the output current, rated for 4 A normal operating level. The CMOS logic section provides four modes of operation: forward and reverse normal drive rotation, outputs-off free spin (coast), and electronic braking. The innovative multi-chip internal structure separates the main logic IC (MIC) from the four N-channel power MOSFETs. This results in lower thermal resistance and greater efficiency. PWM control allows constant-current control of output while reducing heat generation and power losses by providing fixed off-time dual decay modes. The internal charge...