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1. Describe
A3903EEETR-T is a low-voltage bidirectional DC motor driver with The typical input voltage range is 3 to 5.5 V, and the output current is up to To 500 mA. The unique output full bridge combines source-side linear operation to allow constant voltage across the motor Coil. The regulated output minimizes changes due to motor voltage I × RDS(on) change and battery voltage tolerance. Provide logic input pins to control the direction of the motor Rotation, braking and standby (< 500 nA supply current) modes and To allow optional PWM of the receiver driver. Internal protection The circuit includes thermal shutdown, undervoltage lockout, and Cross current (breakdown) protection. A3903 has a nominal size of 2 mm x 2 mm, 0.55 mm Height, 8-pin DFN package with exposed thermal pad (package Suffix EE). This small package does not contain lead (Pb) and has 100% matte tin lead frame plating
2. Features
1. Constant pressure operation (adjustable)
2. 500 mA output peak rating
3. Low power consumption standby mode
4. Small 2 mm×2mm, 0.55 mm nominal height DFN package
5. Typical input voltage range is 3 to 5.5 V
6. Adjustable constant voltage or PWM operation
7. Standby mode current is less than 500 nA
8. –40 to 85 operating temperature range
3. Pin configuration
4. Pin description
5. Application
1. Robotic actuators and pumps
2. Portable printer/scanner
3. Camera lens/shutter control
4. Battery powered toys and games
5. Low noise test instrument system
6. Function Description
1. Voltage regulation A3903 regulation voltage Go through the motor coil. Voltage across OUTA And OUTB terminals are sensed and connected with a Internal threshold voltage. High-side switch will Drive in linear mode to maintain applied voltage Stay at the computational level. Another method is to provide a strictly regulated voltage to the motor power supply pin and run The source driver and sink driver act as switches. Voltage drop The voltage across these switches will vary linearly with temperature and current, so the voltage across the motor The coil will also be different. A3903 will eliminate these Sources of error in the control system Motor voltage is the best control method.
2. Thermal shutdown If the junction temperature TJ reaches 165°C, the A3903 will disable the output. There is a hysteresis of 15°C, so when the junction The temperature drops below 150°C and the device will start normal operation.
3. Dropout mode There is one source driver and sink driver The total RDS(on) is approximately 1.2 Ω. when. . . when It drops too low compared to the motor power supply voltage VDD When the specified value is reached, the IC enters the dropout mode.
4. Braking mode When both inputs are high, A3903 Enter high-end braking mode (open both sources driver). There is no protection when braking, so be careful It must be ensured that the peak current does not The absolute maximum current IOUT is exceeded.
5. Standby mode To minimize battery consumption, standby Mode will close all circuits, and the current drawn from the VDD line is usually less than 100 nA. Here will Is a very short delay, about 2 µs, and then Enable output driver after releasing standby model.
