A2919SLBTR

A2919 Dual Full-Bridge PWM Motor Driver Last Time Buy This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: May 3, 2010 Deadline for receipt of LAST TIME BUY orders: October 29, 2010 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, Inc. 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, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. A2919 Dual Full-Bridge PWM Motor Driver Features and Benefits Description ▪ 750 mA continuous output current ▪ 45 V output sustaining voltage ▪ Internal clamp diodes ▪ Internal PWM current control ▪ Low output saturation voltage ▪ Internal thermal shutdown circuitry ▪ Half- or quarter-step operation of bipolar stepper motors The A2919 motor driver is designed to drive both windings of a bipolar stepper motor or bidirectionally control two DC motors. Both bridges are capable of sustaining 45 V and include internal pulse width modulation (PWM) control of the output current to 750 mA. The outputs have been optimized for a low output-saturation voltage drop (less than 1.8 V total source plus sink at 500 mA). For PWM current control, the maximum output current is determined by the user’s selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0%, 41%, 67%, or 100% of the maximum level. A PHASE input to each bridge determines load current direction. Package: 24-pin SOIC with exposed thermal tabs (suffix LB) The bridges include both ground clamp and flyback diodes for protection against inductive transients. Internally generated delays prevent crossover currents when switching current direction. Special power-up sequencing is not required. Thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits. Continued on the next page… Not to scale PWM Control Circuitry LOAD SUPPLY 24 V Channel 1 pin numbers shown BB OUT 1B 17 14 OUT 1A V REF1 10 16 E1 60 k7 w10 SENSE1 – 15 120 k7 RC 42 k7 I 01 ONE SHOT + SOURCE DISABLE 9 RC1 13 I 1 12 RS CC R T C T Dwg. EP-007-3 29319.21G A2919 Dual Full-Bridge PWM Motor Driver Description (continued) The A2919 is supplied in a 24-pin surface-mountable SOICW with heat sinkable tabs for improved power dissipation capabilities . This batwing construction provides for maximum package power dissipation in the smallest possible construction. The A2919 is available for operation from -20°C to 85°C, and are also available on special order for operation to +125°C. Selection Guide Part Number Packing A2919SLBTR-T Package 1000 pieces per reel 24-pin SOICW with exposed thermal tabs Absolute Maximum Ratings Rating Units Logic Supply Voltage Characteristic Symbol VCC Notes 7.0 V Logic Input Voltage Range VIN –0.3 to VCC+0.3 V Motor Supply Voltage VBB 45 V Output Emitter Voltage VE 1.5 V Output Current IOUT Peak, tw ≤ 20 μs ±1.0 A Continuous ±750 mA Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified peak current rating or a junction temperature of +150°C. Package Power Dissipation PD See graph Operating Ambient Temperature TA Range S Maximum Junction Temperature Storage Temperature – – –20 to 85 ºC TJ(max) 150 ºC Tstg –55 to 150 ºC 5 3 2 1 SUFFIX 'LB', R QJA = 55oC/W 25 50 75 100 TEMPERATURE IN oC 125 24 LOAD SUPPLY 23 OUT 2B 22 SENSE 2 I 12 2 PHASE 2 3 V REF 2 4 21 E2 RC 2 5 20 OUT 2A GROUND 6 19 GROUND GROUND 7 GIC SUPPLY 8 RC 1 99 V REF 1 10 PHASE 1 11 I 11 0 1 θ2 2 VBB 4 02 PWM 2 I RQJT = 6.0oC/W V CC 18 GROUND 17 OUT 1A 16 E1 15 SENSE 1 14 OUT 1B 13 I 01 1 12 θ1 PWM 1 ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS Pin-out Diagram 150 Dwg. PP-047 Dwg. GP-049A Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 A2919 Dual Full-Bridge PWM Motor Driver ELECTRICAL CHARACTERISTICS at TA = +25°C, TJ 150°C, VBB = 45 V, VCC = 4.75 V to 5.25 V, VREF = 5.0 V (unless otherwise noted). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Output Drivers (OUTA or OUTB) Motor Supply Range VBB Operating 10 — 45 V Output Leakage Current ICEX VOUT = VBB — < 1.0 50 μA VOUT = 0 —