A3992SLP-T

A3992 DMOS Dual Full-Bridge Microstepping PWM Motor Driver Features and Benefits ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ±1.5 A, 50 V continuous output rating Low RDS(on) DMOS output drivers Short-to-ground protection Shorted load protection Optimized microstepping via six bit linear DACs Programmable mixed, fast, and slow current decay modes 4 MHz internal oscillator for digital timing Serial interface controls chip functions Synchronous rectification for low power dissipation Internal UVLO and thermal shutdown circuitry Crossover-current protection Inputs compatible with 5 or 3.3 V control signals Sleep and Idle modes Description Designed for pulse width modulated (PWM) current control of bipolar microstepped stepper motors, the A3992 is capable of continuous output currents to ±1.5 A and operating voltages to 50 V. Internal fixed off-time PWM current control timing circuitry can be programmed via the serial interface to operate in slow, fast, or mixed decay modes. The desired load current level is set via the serial port with two six bit linear DACs in conjunction with a reference voltage. The six bits of control allow maximum flexibility in torque control for a variety of step methods, from microstepping to full step drive. Load current is set in 1.56% increments of the maximum value. Synchronous rectification circuitry allows the load current to flow through the low RDS(on) of the DMOS output driver during current decay. This feature eliminates the need for external clamp diodes in most applications, saving cost and external component count, while minimizing power dissipation. Internal circuit protection includes short-to-ground, shorted load, thermal shutdown with hysteresis, and crossover current protection. Special power up sequencing is not required. The A3992 is supplied in a thin profile (1.2 mm maximum height) 24 pin TSSOP (suffix LP) with exposed thermal pad and a 24 pin plastic DIP with dual copper batwing tabs (suffix B). The exposed thermal pad on the LP is at ground potential and needs no electrical isolation. Both packages are lead (Pb) free with 100% matte tin leadframe plating. Packages 24 pin batwing DIP (suffix B) and 24 pin TSSOP with exposed thermal pad (suffix LP) LP package approximate scale Typical Application 0.22 μF VREG 10 μF 5 kΩ Microcontroller or Controller Logic ROSC CLOCK DATA STROBE REF SLEEP VDD 0.22 μF CP1 CP2 VCP 0.22 μF VBB1 A3992 VBB2 OUT1A OUT1B SENSE1 100 μF 0.1 μF OUT2A OUT2B SENSE2 0.1 μF 3992DS A3992 DMOS Dual Full-Bridge Microstepping PWM Motor Driver Selection Guide 15 pieces/tube 62 pieces/tube Tape, 4000 pieces/reel *Contact Allegro for additional packing options Part Number A3992SB-T A3992SLP-T A3992SLPTR-T Packing* Package 24 pin batwing DIP 24 pin TSSOP with exposed thermal pad Absolute Maximum Ratings Characteristic Load Supply Voltage Output Current Logic Supply Voltage Logic Input Voltage Range VBBx to OUTx Voltage OUTx to SENSEx Voltage REF Reference Voltage SENSE Voltage (dc) Operating Ambient Temperature Maximum Junction Temperature Storage Temperature VREF VSENSE TA TJ(max) Tstg Range S Symbol VBB IOUT VDD VIN Output current rating 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. Notes Rating 50 ±1.5 7.0 –0.3 to VDD + 0.3 50 50 3 500 –20 to 85 150 –55 to 150 Units V A V V V V V mV ºC ºC ºC Thermal Characteristics* Characteristic Symbol Notes B package on 4-layer PCB B package on 2-layer PCB with 3.15 in.2 2 oz. copper each side LP package on 4-layer PCB LP package on 2-layer PCB with 3.8 in.2 2 oz. copper each side *Additional thermal data available on the Allegro website. Rating 26 36 28 32 Units °C/W °C/W °C/W °C/W Package Thermal Resistance RθJA Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 2 A3992 DMOS Dual Full-Bridge Microstepping PWM Motor Driver Functional Block Diagram 0.22 µF 0.22 µF VREG 2V VDD UVLO and Fault Detect Regulator Bandgap CP2 CP1 Charge Pump VCP MUX 0.22 µF To VDD 6 Bit Linear DAC VCP DMOS Full Bridge 1 VBB1 >47 µF Internal Oscillator OSC OSC Select/ Divider OUT1A Programmable PWM Timer Fixed-Off Blank Mixed Decay Gate Drive OUT1B SENSE1 OCP CLOCK To VDD DATA STROBE SLEEP Serial Port Control Logic Phase 1,2 Sync Rect Mode Sync Rect Disable Mode 1, 2 DMOS Full Bridge 2 VBB2 OUT2A OUT2B Programmable PWM Timer To 2V VREF Fixed-Off Blank Mixed Decay Buffer 6 Bit Linear DAC SENSE2 0.1 µF REF Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 3 A3992 DMOS Dual Full-Bridge Microstepping PWM Motor Driver ELECTRICAL CHARACTERISTICS1 valid at TA= 25°C, VBB = 50 V, fPWM < 50 kHz, unless otherwise noted Characteristic Symbol Test Conditions Min. Typ.2 Max. Units Output Drivers Operating, IOUT = ±1.5 A 15 – 50 V Load Supply Voltage Range VBB During Sleep mode 0 – 50 V VOUT = VBB –