The DRV2603 is a haptic driver designed specifically to solve common obstacles in driving both Linear Resonance Actuator (LRA) and Eccentric Rotating Mass (ERM) haptic elements. The DRV2603 is also designed for low latency, has excellent efficiency, and plenty of drive strength for actuators commonly used in the portable market.
LRA actuators typically have a narrow frequency band over which they have an adequate haptic response. This frequency window is typically ±2.5 Hz wide or less, so driving an LRA actuator presents a challenge. The DRV2603 solves this problem by employing auto resonance tracking, which automatically detects and tracks the optimum commutation frequency. This means that any input PWM frequency within the input range (10 kHz to 250 kHz) will automatically produce the correct resonant output frequency. As an additional benefit, the DRV2603 implements an optimal braking algorithm to stop the LRA from ringing out, leaving the user with a crisp haptic sensation.
For both ERM and LRA actuators, the automatic input level translation solves issues with low voltage PWM sources without adding additional external components, so if the digital I/O levels vary, the output voltage does not change. The DRV2603 also has supply correction that ensures no supply regulation is required for constant vibration strength, allowing an efficient, direct-battery connection.
Flexible Haptic/Vibra Driver
LRA (Linear Resonance Actuator)
ERM (Eccentric Rotating Mass)
Auto Resonance Tracking for LRA
No Frequency Calibration Required
Automatic Drive Commutation
Automatic Braking Algorithm
Wide Input PWM Frequency Range
Constant Vibration Strength Over Supply
Automatic Input Level Translation
0% to 100% Duty Cycle Control Range
Fast Start Up Time
Differential Drive from Single-Ended Input
Wide Supply Voltage Range of 2.5 V to 5.2 V
1.8 V Compatible, 5 V Tolerant Digital Pins
Available in a 2 mm × 2 mm × 0.75 mm leadless QFN package (RUN)