A3953SB

A3953 Full-Bridge PWM Motor Driver Discontinued Product This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: January 30, 2012 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A4973. 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. A3953 Full-Bridge PWM Motor Driver Features and Benefits Description ▪ ±1.3 A continuous output current ▪ 50 V output voltage rating ▪ 3 V to 5.5 V logic supply voltage ▪ Internal PWM current control ▪ Saturated sink drivers (below 1 A) ▪ Fast and slow current-decay modes ▪ Automotive capable ▪ Sleep (low current consumption) mode ▪ Internal transient-suppression diodes ▪ Internal thermal shutdown circuitry ▪ Crossover current and UVLO protection Designed for bidirectional pulse width modulated (PWM) current control of inductive loads, the A3953 is capable of continuous output currents to ±1.3 A and operating voltages to 50 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user’s selection of an input reference voltage and external sensing resistor. The fixed off-time pulse duration is set by a user- selected external RC timing network. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover current protection. Special power-up sequencing is not required. Packages: Package B, 16-pin DIP with exposed tabs Package LB, 16-pin SOIC with internally fused pins Not to scale With the ENABLE input held low, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. The MODE input determines whether the PWM current-control circuitry operates in a slow current-decay mode (only the selected source driver switching) or in a fast current-decay mode (selected source and sink switching). A user-selectable blanking window prevents false triggering of the PWM current-control circuitry. With the ENABLE input held high, all output drivers are disabled. A sleep mode is provided to reduce power consumption. Continued on the next page… 6 V CC 15 10 LOAD SUPPLY OUT A 9 OUT B LOGIC SUPPLY LOAD SUPPLY Functional Block Diagram 16 SLEEP & STANDBY MODES MODE 14 PHASE 7 V BB BRAKE 1 PWM LATCH R 11 – 8 + ENABLE INPUT LOGIC UVLO & TSD SENSE Q S BLANKING GROUND 4 V CC RS RC 3 5 12 + – 2 REF RT CT 13 GROUND V TH Dwg. FP-036-2A 29319.8I A3953 Full-Bridge PWM Motor Driver Description (continued) When a logic low is applied to the BRAKE input, the braking function is enabled. This overrides ENABLE and PHASE to turn off both source drivers and turn on both sink drivers. The brake function can be used to dynamically brake brush DC motors. and a 16-pin plastic SOIC with copper heat-sink tabs. For both package styles, the power tab is at ground potential and needs no electrical isolation. Each package type is available in a lead (Pb) free version (100% matte tin plated leadframe). The A3953 is supplied in a choice of two power packages; a 16-pin dual-in-line plastic package with copper heat-sink tabs, Selection Guide Part Number A3953SB-T A3953SLBTR-T Package 16-pin DIP with exposed thermal tabs 16-pin SOICW with internally-fused pins Packing 25 pieces per tube 1000 pieces per reel Absolute Maximum Ratings Characteristic Symbol Rating Units 50 V VCC 7.0 V VIN –0.3 to VCC + 0.3 V VCC = 5.0 V 1.0 V VCC = 3.3 V 0.4 V 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. ±1.3 A Load Supply Voltage VBB Logic Supply Voltage Logic/Reference Input Voltage Range Sense Voltage Notes VSENSE Output Current, Continuous IOUT Package Power Dissipation PD Operating Ambient Temperature TA Maximum Junction Temperature TJ(max) Storage Temperature Range S See graph W –20 to 85 ºC 150 ºC –55 to 150 ºC Value Units 43 ºC/W 67 ºC/W 6 ºC/W Fault conditions that produce excessive junction temperature will activate the device’s thermal shutdown circuitry. These conditions can be tolerated but should be avoided. Tstg Thermal Characteristics Characteristic Symbol Test Conditions* B Package, single-layer PCB, 1 in.2 2-oz. exposed copper Package Thermal Resistance, Junction to Ambient RθJA Package Thermal Resistance, Junction to Tab RθJT LB Package, 2-layer PCB, 0.3 side in.2 2-oz. exposed copper each Note the A3953SB (DIP) and the A3953SLB (SOIC) are electrically identical and share a common terminal number assignment. 16 LOAD SUPPLY 2 15 OUTB RC 3 14 MODE GROUND 4 13 GROUND BRAKE 1 REF VBB LOGIC GROUND 5 LOGIC SUPPLY 6 PHASE 7 ENABLE 8 VCC VBB 12 GROUND 11 SENSE 10 OUTA 9 LOAD SUPPLY ALLOWABLE PACKAGE POWER DISSIPATION (W) *Additional thermal information available on Allegro website. 4 R θJT = 6.0°C/W 3 SUFFIX 'B', R θJA = 43°C/W 2 1 SUFFIX 'LB', R θJA = 67°C/W 0 25 50 75 100 TEMPERATURE IN °C 125 150 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 A3953 Full-Bridge PWM Motor Driver ELECTRICAL CHARACTERISTICS at TJ = 25°C, VBB = 5 V to 50 V, VCC = 3.0 V to 5.5 V (unless otherwise noted.) Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units VCC — 50 V Power Outputs Load Supply Voltage Range VBB Operating, IOUT = ±1.3 A, L = 3 mH Output Leakage Current ICEX VOUT = VBB —