Description
The A1448 is a full-bridge motor driver designed to drive low-voltage, brushless DC motors. The device is designed to allow the user to control several functions with a single input control pin. The pin allows for direct input PWM for speed control, is used to initiate the active braking function to reduce motor stop time, and acts as an enable pin to engage micro-power sleep mode to reduce average power consumption when not in use. The A1448 is designed for use in vibration motor applications in portable devices that require fast stop-start cycles, such as haptic applications and vibration ring tones.
Features and Benefits
âªLow-voltage operation, 1.8 to 4.2 V
âªMultifunction CONTROL pin input:
â«Direct input PWM for speed control
â«Active braking for fast stop cycle
â«Sleep function to reduce average power consumption
âªReverse voltage protection on VDD and CONTROL pins
âªOutput thermal shutdown protection for robust performance
âªSoft switching algorithm to reduce audible switching noise and EMI
âªHall chopper stabilization technique for precise signal response over operating range
âªAntistall feature guarantees continuous rotation and prevents overheating
âªSingle-chip solution for high reliability
âªMiniature MLP/DFN package with industry-leading 0.40 mm maximum overall thickness
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