参数资料
型号: A3918SESTR-T
厂商: Allegro Microsystems Inc
文件页数: 1/8页
文件大小: 0K
描述: IC MOTOR DRIVER DC 16QFN
特色产品: A3918 DC Motor Driver
标准包装: 1
应用: 直流电机驱动器,PWM 电机驱动器
评估套件: *
输出数: 1
电流 - 输出: 1A
电源电压: 2.5 V ~ 9 V
工作温度: -20°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-WFQFN 裸露焊盘
供应商设备封装: 16-QFN(3x3)
包装: 标准包装
其它名称: 620-1476-6
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
? Undervoltage lockout
? Low R DS(on) outputs
? Small package
? Brake mode for DC motor
? Sleep function
? Crossover-current protection
? Thermal shutdown
Package: 16-contact QFN (suffix ES)
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
3 × 3 mm
0.75 mm overall height
Approximate size
Functional Block Diagram
+5 V
0.1 μ F
VBB
0.1 μ F
Charge
Pump
0.1 μ F
VCP
VBB
SLEEP
FL
Regulator
Sense
PWM Latch
and
Blanking
Comparator
Bridge
OUTA
OUTB
10 μ F
10 V
IN1
IN2
Control Logic
Sense
SENSE
R SENSE
GND
PAD
GND
GND
A3918-DS
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