A4936METTR-T

A4936 3-Phase Brushless DC Motor Pre-Driver Discontinued Product This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: March 6, 2017 Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. A4936 3-Phase Brushless DC Motor Pre-Driver Features and Benefits • Drives 6 N-channel MOSFETs • Synchronous rectification for low power dissipation • Internal UVLO and thermal shutdown circuitry • Hall element inputs • PWM current limiting • Dead time protection • FG outputs • Standby mode • Lock detect protection • Overvoltage protection Package: 32-contact QFN (suffix ET) Description The A4936 is a complete 3-phase brushless DC motor pre-driver, supplying up to 28 V output for direct, high-current gate drive of an all N-channel power MOSFET 3-phase bridge. The device has three Hall-element inputs, a sequencer for commutation control, fixed off-time pulse width modulation (PWM) current control, and locked-rotor detection. Output current is scaled by the capability of the external MOSFETs. Locked rotor detection delay is set by an external capacitor on the CLD terminal. The PWM, DIR, and BRAKE and STOP inputs can be used to control motor speed, position, and torque. Motor speed can be determined using the FG output from an FG coil amplifier and comparator. The external MOSFETS can be PWMed using an external signal on the PWM input, or using the internal PWM current regulator. In either case, the A4936 synchronous rectification feature reduces power dissipation by turning-on the appropriate MOSFETs during current decay. The Hall elements can be inexpensive types, when used with noise filtering to prevent false commutation signals. The A4936 provides a regulated 7.5 V supply to power the three Hall elements. Not to scale Continued on the next page… Typical Application Diagram V+ System Control Logic A4936-DS, Rev. 2 MCO-0000187 BLDC Motor A4936 June 4, 2019 A4936 3-Phase Brushless DC Motor Pre-Driver Description (continued) Internal circuit protection includes thermal shutdown with hysteresis, undervoltage lockout, and dead time protection. Special power-up sequencing is not required. Operating temperature range is –20°C to 105°C. Selection Guide Part Number The device package is a 32-contact, 5 mm × 5 mm, 0.90 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. This small-footprint package is lead (Pb) free, with 100% matte tin leadframe plating. Packing* Package A4936MET-T 73 pieces per tube A4936METTR-T 1500 pieces per reel *Contact Allegro™ for additional packing options 32-pin QFN, 5 mm × 5 mm, 0.90 mm nominal overall height Absolute Maximum Ratings Characteristic Load Supply Voltage Symbol Notes Motor Phase Output Sx tw< 500 ns Hall Input VHx DC Logic Input Voltage Range VIN Ambient Operating Temperature TA Maximum Junction Temperature Storage Temperature Rating Unit 38 V –3 V –0.3 to 7 V VBB –0.3 to 7 V –20 to 105 °C TJ(max) 150 °C Tstg –40 to 150 °C Range M Thermal Characteristics may require derating at maximum conditions, see application information Characteristic Symbol Package Thermal Resistance (Junction to Ambient) RθJA Package Thermal Resistance (Junction to Exposed Pad) RθJP Test Conditions* On 4-layer PCB based on JEDEC standard Value Unit 32 ºC/W 2 ºC/W *Additional thermal information available on the Allegro website Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 A4936 3-Phase Brushless DC Motor Pre-Driver Functional Block Diagram 100 nF CP1 CLD 100 nF 4 5 6 HALL 24 GHA 23 SB 22 GHB 21 SC 20 GHC 19 GLA PAD 18 GLB 17 GLC System Logic Enable Phase A HA+ HA– HB+ HB– 100 nF VIN GHA Gate Drive Control Logic 100 nF VCP VREG SA GLA HC+ HC– 200 mV SENSE Phase A of three phases shown GHB SB GLB GHC SC GLC BRAKE STOP FGFB DIR 13 14 15 16 7 8 CP2 VBB VCP SENSE FG– 27 CLD 26 FGS 25 SA 32 HA+ 31 BRAKE 30 STOP 29 PWM 28 DIR HC– FG+ FGFB 1 2 3 NC 9 GND 10 HBIAS 11 CP1 12 HA– HB+ HB– HC+ HALL OVP Communication Logic VCP VBB + Pin-out Diagram Charge Pump VREG HBIAS 2 kΩ HALL CP2 – 100 nF Lock Detect PWM – FGS + FG– FG+ GND Terminal List Table Number Name Function Number Name Function 1 HA- Hall input A 18 GLB Low-side gate drive B 2 HB+ Hall input B 19 GLA Low-side gate drive A 3 HB- Hall input B 20 GHC High-side gate drive C 4 HC+ Hall input C 21 SC High-side source connection C 5 HC- Hall input C 22 GHB 6 FG+ FG input 23 SB High-side gate drive B 7 FGFB FG amplifier feedback output 24 GHA 8 FG- FG input 25 SA 9 NC No internal connection 26 FGS FG output Ground 27 CLD Locked rotor detect timing capacitor Hall bias power supply output 28 DIR Logic input: motor direction High-side source connection B High-side gate drive A High-side source connection A 10 GND 11 HBIAS 12 CP1 Charge pump capacitor terminal 29 PWM Logic input: external PWM control 13 CP2 Charge pump capacitor terminal 30 STOP Logic input: output disable 14 VBB Supply voltage 31 BRAKE 15 VCP Reservoir capacitor terminal 32 HA+ Hall input A 16 SENSE 17 GLC – PAD Exposed Thermal Pad Sense resistor connection Low-side gate drive C Logic input: motor brake Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 A4936 3-Phase Brushless DC Motor Pre-Driver ELECTRICAL CHARACTERISTICS1,2 Valid at TA = 25°C, VIN = 24 V; unless otherwise noted Characteristics Symbol Test Conditions Min. Typ.3 Max. Unit 8.5 – VBBOV V fPWM < 30 kHz, CLOAD = 1000 pF – 5.1 6.5 mA Standby mode – 3 4 mA General Supply Voltage Range VBB Motor Supply Current IBB Operating HBIAS VHBIAS 7.2 7.5 7.8 V HBIAS Current Limit IHBIASlim 30 – – mA VIN(1) 2 – – V VIN(0) – – 0.8 V 0 mA ≤ IHBIAS ≤ 24 mA Control Logic Logic Input Voltage Logic Input Current IIN(1) VIN = 2 V –1.0