FAH4840-269128 Datasheet, PDF (18/21 Pages) List of Unclassifed Manufacturers – FAH4840 Haptic Driver for Linear Resonant Actuators (LRAs)

Internal LDO
The internal LDO is designed for adjustable output
voltage (VREG_OUT), controlled by a 16-step I²C register.
This provides flexibility, convenience, and configuration
for low-power consumption. The LDO includes an
internal circuit for short-circuit current protection.
Serial Interface
The I²C registers allow the user to program the motor
type, PWM dividing ratio, power-down, and other
functions. The device needs to function without any I²C
input signals connected.
Thermal Shutdown
The device has thermal shutdown capability. If the
junction temperature is above 150°C, the temperature
control block shuts down and remains off until the
temperature goes below 134°C. The register values are
kept, so re-initialization is not required.
Over-Current Limitation
The driver includes a current-limitation block to protect
against an over-current condition. This is mainly a
protection against a stuck spring condition. Over-current
shutdown is at 350 mA typically.
Status Registers
The status register set monitors LDO input voltage,
regulator output voltage, and over-temperature status.
FAH4840 shut down current, software disable ON, HEN=0.
PWM=0
2000
1800
1600
1400
1200
1000
800
600
400
200
0
Vcc
Figure 13. Typical Performance Characteristics
© 2013 Fairchild Semiconductor Corporation
FAH4840 • Rev. 1.0.0
18
www.fairchildsemi.com