A3918 Low Voltage DC Motor Driver
Features and Benefits
▪ 2.5 to 9 V operation ▪ Internal PWM current control ▪ Synchron...
A3918 Low
Voltage DC Motor Driver
Features and Benefits
▪ 2.5 to 9 V operation ▪ Internal PWM current control ▪ Synchronous rectification for reduced power dissipation ▪ Peak current output flag ▪ Under
voltage lockout ▪ Low RDS(on) outputs ▪ Small package ▪ Brake mode for DC motor ▪ Sleep function ▪ Crossover-current protection ▪ Thermal shutdown
Description
Designed for pulse width modulated (PWM) control of a low
voltage DC motor, the A3918 is capable of output currents up to 1.5 A and operating
voltages from 2.5 to 9 V. The A3918 has an internal fixed off-time PWM timer that sets a peak current based on the selection of a current sense resistor. An overcurrent output flag is provided that notifies the user when the current in the motor winding reaches the peak current determined by the sense resistor. The fault output does not affect driver operation. The A3918 is provided in a 16-contact, 3 mm × 3 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating. Applications include the following: ▪ Digital still cameras (DSC) ▪ Cell phone cameras ▪ USB powered devices ▪ Battery powered devices
Package: 16-contact QFN (suffix ES)
3 × 3 mm 0.75 mm overall height Approximate size
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Functional Block Diagram
0.1 μF 0.1 μF VCP CP2 CP4 CP1 CP3 0.1 μF
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