Description
The L99MD01 is an octal half-bridge driver for automotive applications. The device is intended to drive DC and/or stepper motors. Using the boost converter it’s possible to drive 4 stepper motors simultaneously. Without boost converter the system is able to run 3 stepper motors in sequential mode or 2 stepper motors simultaneously. The octal half bridge configuration allows also to drive 4 DC-motors simultaneously and 7 DC-motors sequentially. The integrated 24 bit standard Serial Peripheral Interface (SPI) controls all outputs and provides diagnostic information: normal operation, openload in on-state, overcurrent, temperature warning and overtemperature.

Features
■ 8 half bridges
■ RON = typ. 0.9 Ω (HS), 0.64 Ω (LS) @ Tj = 25 °C
■ Current limit of each output at min. 0.8 A
■ Intrinsic DC/DC step up converter driving an external MOSFET
■ PWM mode option for all half bridges for hold current
■ Internal PWM generation
■ Two current monitor outputs
■ SPI interface for data communication
■ Temperature warning
■ All outputs overtemperature protected
■ All outputs short circuit protected
■ VCC supply voltage 3.0 to 5.3 V
■ Very low current consumption in standby mode typ. 5 µA
■ VS operating range compliant: 6 V – 18 V

Applications
■ Stepper motor driver and / or DC
■ Intended to drive HVAC flaps