AMT49400GLKATR

AMT49400 Integrated Sensorless FOC BLDC Driver FEATURES AND BENEFITS DESCRIPTION • • • • The AMT49400 is an advanced 3-phase, sensorless, brushless DC (BLDC) motor driver with integrated power MOSFETs. • • • • • • • • Coding-free sensorless field-oriented control (FOC) Standby mode current less than 10 µA Quiet and quick startup Only two external components for minimal application circuit PWM speed input, FG speed output Lock detection Soft-on soft-off (SOSO) Optional closed-loop speed control Configurable current limit Windmill and reverse windmill operation Lock detection Short-circuit protection (OCP) A minimal application circuit can be achieved with only two external components due to device’s high level of integration, which includes control algorithm, analog circuit, and power stage. A field-oriented control (FOC) algorithm is fully integrated to achieve the best efficiency and acoustic noise performance. EEPROM programmability is included to optimize motor startup performance. The motor speed is controlled by applying a duty cycle command to the PWM input. A simple I2C interface is provided for setting motor-rated voltage, rated current, rated speed, resistance, and startup profiles. The I2C interface is also used for on/off control, speed control, and speed readback. The AMT49400 is available in a 10-lead SOIC with exposed pad, (suffix LK). PACKAGE: APPLICATIONS • Computer fans • Exhaust fans • Home appliance fans and pumps 10-lead SOIC with exposed thermal pad (LK package) Not to scale VCC VBB 4.7 µF AMT49400 OUTA FG OUTB PWM FOC Controller OUTC VREF TEST1 TEST2 0.22 µF GND Figure 1: Typical Application AMT49400-DS, Rev. 2 MCO-0000626 June 10, 2019 AMT49400 Integrated Sensorless FOC BLDC Driver SELECTION GUIDE Part Number Ambient Temperature Range (TA) (°C) Packaging Packing AMT49400GLKATR –40 to 105 10-lead SOIC with exposed thermal pad 3000 pieces per 13-inch reel ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Supply Voltage VBB Logic Input Voltage Range VIN Logic Output – FG VO Output Current Output Voltage Notes tw < 10 ms PWM Rating Unit –0.3 to 20 V –0.3 to 18 V –0.3 to 6 V PWM (pull-up resistor > 50 kΩ) VBB V FG 18 V IOUT 2 A VOUT GND – 1 to VBB + 1 V Junction Temperature TJ 150 °C Storage Temperature Range Tstg Operating Temperature Range TA Range G –55 to 150 °C –40 to 105 °C THERMAL CHARACTERISTICS Characteristic Symbol Package Thermal Resistance RθJA Test Conditions* Value Unit 40 °C/W 10-lead SOIC (package LK), on 2-sided PCB 1-in.2 copper *Additional thermal information available on the Allegro website. PINOUT DIAGRAM AND TERMINAL LIST Terminal List Table PWM 1 10 TEST2 FG 2 9 TEST1 VBB 3 PAD 8 VREF OUTA 4 7 OUTC OUTB 5 6 GND LK-10 Package Pinouts Terminal Number Name 1 PWM Function Logic input – speed demand 2 FG Output signal 3 VBB Input supply 4 OUTA Motor terminal 5 OUTB Motor terminal 6 GND 7 OUTC Motor terminal Ground 8 VREF Reference voltage output 9 TEST1 Test use only 10 TEST2 Test use only PAD PAD Exposed pad for enhanced thermal dissipation 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com AMT49400 Integrated Sensorless FOC BLDC Driver ELECTRICAL CHARACTERISTICS [1]: Valid over operating ambient temperature range and operating voltage range, unless noted otherwise Characteristics Symbol Test Conditions Min. Typ. Max. Unit 4 – 16 V GENERAL Supply Voltage Range VBB VBB Supply Current IBB Reference Voltage VREF IVREF = 0 mA – 4 5 mA Standby mode –