A3995

A3995 DMOS Dual Full Bridge PWM Motor Driver Features and Benefits ▪ ▪ ▪ ▪ ▪ ▪ ▪ 36 V output rating 2.4 A dc motor driver Synchronous rectification Internal undervoltage lockout (UVLO) Thermal shutdown circuitry Crossover-current protection Very thin profile QFN package Description The A3995 is designed to drive two dc motors at currents up to 2.4 A. Capable of drive voltages up to 36 V, the A3995 includes two independent fixed off-time PWM current regulators that operate in either fast or slow decay mode, as determined by the MODE input. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Protection features include: thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover current protection. Special power-up sequencing is not required. The A3995 is supplied in a 36 pin QFN package (suffix EV) with exposed power tab for enhanced thermal performance. It has a 6 mm × 6 mm footprint, with a nominal overall package height of 0.90 mm, and is lead (Pb) free, with 100% matte tin leadframe plating. Package: 36 pin QFN 0.90 mm nominal height (suffix EV) Approximate scale 1:1 Typical Application Diagram CP1 VDD CP2 VCP VBB VBB OUT1A OUT1A OUT1B OUT1B SENSE1 SENSE1 MODE1 PHASE1 Microcontroller or Controller Logic ENABLE1 VREF1 MODE2 PHASE2 ENABLE2 VREF2 A3995 OUT2A OUT2A OUT2B OUT2B GND GND GND A3995DS GND SENSE2 SENSE2 A3995 Selection Guide Part Number A3995SEV-T A3995SEVTR-T 61 pieces per tube 1500 pieces per reel DMOS Dual Full Bridge PWM Motor Driver Packing Absolute Maximum Ratings Characteristic Load Supply Voltage Logic Supply Voltage Output Current* Logic Input Voltage Range SENSEx Pin Voltage VREFx Pin Voltage Operating Temperature Range Junction Temperature Storage Temperature Range Symbol VBB VDD IOUT VIN VSENSEx VREFx TA TJ(max) Tstg Range S Pulsed tw < 1µs Continuous Pulsed tw < 1µs Pulsed tw < 1 µs Notes Rating -0.5 to 36 38 –0.4 to 7 .4 3.5 –0.3 to 7 0.5 .5 .5 –0 to 85 150 –55 to 150 Units V V V A A V V V V ºC ºC ºC * May be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a Junction Temperature of 150°C. Thermal Characteristics (may require derating at maximum conditions) Characteristic Package Thermal Resistance Symbol RθJA Test Conditions EV package, 4 layer PCB based on JEDEC standard Min. Units 7 ºC/W Power Dissipation versus Ambient Temperature 5500 5000 4500 4000 Power Dissipation, PD (mW) 3500 3000 2500 2000 1500 1000 500 0 25 50 75 100 125 Temperature (°C) 150 175 EV Package 4-layer PCB (R JA = 27 ºC/W) Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com  A3995 DMOS Dual Full Bridge PWM Motor Driver Functional Block Diagram VCP VBB VD D O SC CHARGE PUMP VCP DMOS Full Bridge 1 MODE1 PHASE1 ENABLE1 CONTROL LOGIC GATE DRIVE VBB CP1 CP1 OUT1A OUT1A OUT1B OUT1B Sense1 V R EF 1 3 - PWM Latch BLANKING S E N SE 1 S E N SE 1 + VCP DMOS Full Bridge 2 R S1 MODE2 PHASE2 ENABLE2 CONTROL LOGIC GATE DRIVE OUT2A OUT2A OUT2B OUT2B Sense2 V R EF 2 3 GND GND GND GND + - PWM Latch BLANKING Sense2 S E N SE 2 S E N SE 2 NC NC NC NC NC NC R S2 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 3 A3995 Characteristics DMOS Dual Full Bridge PWM Motor Driver Symbol VBB VDD IDD RDS(on) IDSS IBB VIN(1) VIN(0) IIN Vhys PWM change to source on tpd tCOD tBLANK VREFx IREF VUV(VBB) VUV(VBB)hys VUV(VDD) VUV(VDD)hys TJTSD TJTSDhys VDD rising Operating VREF = 1.5 VBB rising PWM change to source off PWM change to sink on PWM change to sink off VIN = 0 to 5 V Source driver, IOUT = –1. A, TJ = 5°C Sink driver, IOUT = 1. A, TJ = 5°C IOUT = 1. A Outputs, VOUT = 0 to VBB IOUT = 0 mA, outputs on, PWM = 50 kHz, DC = 50% Test Conditions Min. 8.0 3.0 – – – – –0 – 0.7×VDD – –0 150 350 35 350 35 300 .5 0.0 – 7.3 400 .65 75 155 – Typ. – – 7 350 350 – – – – –