A6861 Automotive 3-Phase Isolator MOSFET Driver FEATURES AND BENEFITS DESCRIPTION Three floating N-channel MOSFET drives The A6861 is an N-channel power MOSFET driver capable of Maintains VGS with 100 k gate-source resistors controlling MOSFETs connected as a three-phase solid-state Integrated charge pump controller relay in phase-isolation applications. The A6861 is intended 4.5 to 50 V supply voltage operating range for automotive systems that must meet ASIL requirements. Independent TTL input for each phase In safety-critical applications, motor isolation is a critical 150C ambient (165C junction) continuous safety requirement which is currently addressed with discrete 2- 2- A SIL Productdevice features for safety-critical circuitry or relays. Allegro A SIL products include specific systems features that complement proper system design, allowing users to achieve up to ASIL-D system rating. APPLICATIONS The A6861 has three independent floating gate drive outputs Three-phase safety disconnect systems to maintain the power MOSFETs in the on state over the full Electric power steering (EPS) supply range with high phase-voltage slew rates. An integrated Electric braking charge pump regulator provides the above battery supply Three-phase solid-state relay driver voltage necessary to maintain the power MOSFETs in the on state continuously when the phase voltage is equal to the battery voltage. The charge pump will maintain sufficient gate PACKAGE: drive (>7.5 V) for battery voltages down to 4.5 V with 100 k 16-Lead TSSOP with exposed thermal pad (suffix LP) gate-source resistors. The three gate drives can be independently controlled by a logic level control input. In typical applications, the MOSFETs will be switched on within 8 s and will switch off within 1 s. Continued on the next page Not to scale. Typical Application Diagram 6861-DS, Rev. 6 January 29, 2019 MCO-0000284A6861 Automotive 3-Phase Isolator MOSFET Driver DESCRIPTION (continued) An undervoltage monitor checks that the pumped supply voltage The A6861 is supplied in a 16-lead TSSOP (LP), with exposed is high enough to ensure that the MOSFETs are maintained in a pad for enhanced thermal dissipation. They are lead (Pb) free, with safe conducting state. 100% matte tin leadframe plating. SELECTION GUIDE Part Number Packing Package 16-Lead TSSOP with exposed thermal A6861KLPTR-T 13-in. reel, 4000 pieces/reel pad, 4.4 mm 5 mm case SPECIFICATIONS 1 ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Units Load Voltage Supply V 0.3 to 50 V BB V 0.3 to BB Terminal VCP V V CP V + 12 BB V 12 to BB Terminal CP1 V V CP1 V + 0.3 BB V 0.3 to BB Terminal CP2 V V CP2 V + 0.3 CP4 V 12 to BB Terminal CP3 V V CP3 V + 0.3 BB V 0.3 to CP2 Terminal CP4 V V CP4 V + 0.3 CP Terminal ENU, ENV, ENW V 0.3 to 50 V I V 0.3 to SX Terminal GU, GV, GW V V GX V + 12 SX Terminal SU, SV, SW V 6 to V + 5 V SX BB Operating Ambient Temperature T Limited by power dissipation 40 to 150 C A Maximum Continuous Junction Temperature T 165 C J(max) Overtemperature event not exceeding 10 seconds, Transient Junction Temperature T lifetime duration not exceeding 10 hours, guaranteed by 175 C Jt design characterization. Storage Temperature T 55 to 150 C stg 1 With respect to GND. Ratings apply when no other circuit operating constraints are present. THERMAL CHARACTERISTICS: May require derating at maximum conditions, see application information Characteristic Symbol Test Conditions* Value Units 4-layer PCB based on JEDEC standard 34 C/W Package Thermal Resistance R JA (Junction to Ambient) 1-layer PCB with copper limited to solder pads 43 C/W Package Thermal Resistance R 2 C/W JP (Junction to Pad) *Additional thermal data available on the Allegro Web site. 2 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com