A3992 DMOS Dual Full-Bridge Microstepping PWM Motor Driver Features and Benefits Description 1.5 A, 50 V continuous output rating Designed for pulse width modulated (PWM) current control of Low R DMOS output drivers DS(on) bipolar microstepped stepper motors, the A3992 is capable of Short-to-ground protection continuous output currents to 1.5 A and operating voltages to Shorted load protection 50 V. Internal fixed off-time PWM current control timing circuitry Optimized microstepping via six bit linear DACs can be programmed via the serial interface to operate in slow, fast, Programmable mixed, fast, and slow current decay modes or mixed decay modes. 4 MHz internal oscillator for digital timing The desired load current level is set via the serial port with two Serial interface controls chip functions six bit linear DACs in conjunction with a reference voltage. The Synchronous rectification for low power dissipation six bits of control allow maximum flexibility in torque control for Internal UVLO and thermal shutdown circuitry a variety of step methods, from microstepping to full step drive. Crossover-current protection Load current is set in 1.56% increments of the maximum value. Inputs compatible with 5 or 3.3 V control signals Synchronous rectification circuitry allows the load current to flow Sleep and Idle modes through the low R of the DMOS output driver during current DS(on) decay. This feature eliminates the need for external clamp diodes in most applications, saving cost and external component count, Packages while minimizing power dissipation. 24 pin batwing DIP (suf x B) and 24 pin TSSOP with Internal circuit protection includes short-to-ground, shorted load, exposed thermal pad (suf x LP) 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. LP package approximate scale Typical Application 0.22 F0.22 F VREG CP1 CP2 0.22 F VCP VDD 10 F 5 k VBB1 ROSC Microcontroller or A3992 VBB2 100 F Controller Logic CLOCK OUT1A OUT1B DATA SENSE1 0.1 F STROBE REF OUT2A OUT2B SLEEP SENSE2 0.1 F 3992DS, Rev. 2DMOS Dual Full-Bridge A3992 Microstepping PWM Motor Driver Selection Guide Part Number Packing Package A3992SB-T 15 pieces/tube 24 pin batwing DIP 24 pin TSSOP with Tape, 4000 pieces/reel A3992SLPTR-T exposed thermal pad Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Load Supply Voltage V 50 V BB Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do Output Current I 1.5 A OUT not exceed the speci ed current rating or a junction tempera- ture of 150C. Logic Supply Voltage V 7.0 V DD Logic Input Voltage Range V 0.3 to 7 V IN VBBx to OUTx Voltage 50 V OUTx to SENSEx Voltage 50 V REF Reference Voltage V 3V REF SENSE Voltage (DC) V 500 mV SENSE Operating Ambient Temperature T Range S 20 to 85 C A Maximum Junction Temperature T (max) 150 C J Storage Temperature T 55 to 150 C stg Thermal Characteristics* Characteristic Symbol Notes Rating Units B package on 4-layer PCB 26 C/W 2 B package on 2-layer PCB with 3.15 in. 36 C/W 2 oz. copper each side Package Thermal Resistance R JA LP package on 4-layer PCB 28 C/W 2 LP package on 2-layer PCB with 3.8 in. 32 C/W 2 oz. copper each side *Additional thermal data available on the Allegro website. Allegro MicroSystems, LLC 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com