3958

3958 DMOS FULL-BRIDGE PWM MOTOR DRIVER A3958SLB CHARGE PUMP CP CP2 CP1 PHASE OSC GROUND GROUND LOGIC SUPPLY ENABLE DATA CLOCK STROBE 1 2 3 4 5 θ 24 23 NC 22 21 VBB 20 19 18 VREG RANGE NO CONNECTION OUTB LOAD SUPPLY GROUND GROUND SENSE OUTA NO CONNECTION MODE REF Dwg. PP-069A Designed for pulse-width modulated (PWM) current control of dc motors, the A3958SB and A3958SLB are capable of continuous output currents to ±2 A and operating voltages to 50 V. Internal fixed offtime PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes. PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a dc motor with externally applied PWM-control signals. The ENABLE input can be programmed via the serial port to PWM the bridge in fast or slow current decay. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, and crossover-current protection. Special power-up sequencing is not required. The A3958SB/SLB is supplied in a choice of two power packages, a 24-pin plastic DIP with a copper batwing tab (package suffix ‘B’), and a 24-pin plastic SOIC with a copper batwing tab (package suffix ‘LB’). In both cases, the power tab is at ground potential and needs no electrical isolation. Each package type is available in a lead-free version (100% matte tin leadframe). Data Sheet 29319.31D 6 7 8 9 9 V DD LOGIC 17 16 SERIAL PORT 10 11 12 NC 15 14 ÷ 13 Note that the A3958SLB(SOIC) and A3958SB (DIP) do not share a common terminal assignment. FEATURES ±2 A, 50 V Continuous Output Rating Low rDS(on) Outputs (270 mΩ, Typical) Programmable Mixed, Fast, and Slow Current-Decay Modes Serial Interface Controls Chip Functions Synchronous Rectification for Low Power Dissipation Internal UVLO and Thermal-Shutdown Circuitry Crossover-Current Protection RθJA (°C/W) 40 40 77 RθJT (°C/W) 6 6 6 ABSOLUTE MAXIMUM RATINGS Load Supply Voltage, VBB ...................... 50 V Output Current, IOUT ............................. ±2.0 A Logic Supply Voltage, VDD .................... 7.0 V Input Voltage, VIN ....... -0.3 V to VDD + 0.3 V Sense Voltage, VS ................................... 0.5 V Reference Voltage, VREF ........................ 2.7 V Package Power Dissipation (TA = 25°C), PD A3958SB ...................................... 3.1 W* A3958SLB .................................... 1.6 W* Operating Temperature Range, TA .................................... -20°C to +85°C Junction Temperature, TJ .................................................. +150°C Storage Temperature Range, TS .................................. -55°C to +150°C 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. * Per SEMI G42-88 Specification. Part Number A3958SB-T A3958SLB-T A3958SLBTR-T * Pb-free* Yes Yes Yes Package 16-Pin DIP 16-Lead SOIC 16-Lead SOIC Packing 25 per Tube 47 per Tube 1000 per reel Pb-based variants are being phased out of the product line. The variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadline for receipt of LAST TIME BUY orders: April 27, 2007. These variants include: A3958SB, A3958SLB and A3958SLBTR. 3958 DMOS FULL-BRIDGE PWM MOTOR DRIVER FUNCTIONAL BLOCK DIAGRAM VDD LOGIC SUPPLY CHARGE PUMP BANDGAP VDD CREG TSD VBB + CP1 CP2 LOAD SUPPLY BANDGAP REGULATOR VREG UNDERVOLTAGE & FAULT DETECT CHARGE PUMP CONTROL LOGIC OUTA PHASE ENABLE SYNC RECT MODE SYNC RECT DISABLE PWM MODE INT PWM MODE EXT MODE PHASE ENABLE GATE DRIVE CP OUTB SENSE ZERO CURRENT DETECT CS RS OSC FIXED OFF PROGRAMMABLE BLANK DECAY PWM TIMER CLOCK DATA STROBE RANGE SERIAL PORT SLEEP MODE CURRENT SENSE RANGE REFERENCE BUFFER & DIVIDER REF VREF Dwg. FP-048 CP2 CP1 PHASE OSC GROUND GROUND GROUND GROUND LOGIC SUPPLY ENABLE DATA CLOCK 1 2 3 4 5 θ CHARGE PUMP 24 23 22 21 VBB 20 19 18 17 CP VREG RANGE OUTB LOAD SUPPLY GROUND GROUND SENSE OUTA MODE REF STROBE Dwg. PP-069-1A A3958SB Note that the A3958SLB (SOIC) and A3958SB (DIP) do not share a common terminal assignment. 6 7 8 9 9 10 11 12 V DD LOGIC 16 15 ÷ SERIAL PORT 14 13 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2000, 2002 Allegro MicroSystems, Inc. 3958 DMOS FULL-BRIDGE PWM MOTOR DRIVER ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 50 V, VDD = 5.0 V, VSENSE = 0.5 V, fPWM < 50 kHz (unless noted otherwise) Limits Characteristics Output Drivers Load Supply Voltage Range Output Leakage Current Output On Resistance Body Diode Forward Voltage Load Supply Current VBB IDSS rDS(on) VF IBB Operating During sleep mode VOUT = VBB VOUT = 0 V Source driver, IOUT = -2 A Sink driver, IOUT = 2 A Source diode, IF = -2 A Sink diode, IF = 2 A fPWM < 50 kHz Charge pump on, outputs disabled Sleep Mode Control Logic Logic Supply Voltage Range Logic Input Voltage Logic Input Current (all inputs except ENABLE) ENABLE Input Current OSC input frequency OSC input duty cycle OSC input hysteresis Input Hysterisis Reference Input Volt. Range Reference Input Current Comparator Input Offset Volt. VDD VIN(1) VIN(0) IIN(1) IIN(0) IIN(1) IIN(0) fOSC dcOSC – – VREF IREF VIO VIN = 2.0 V VIN = 0.8 V VIN = 2.0 V VIN = 0.8 V Operating Operating Operating All digital inputs except OSC Operating VREF = 2.5 V VREF = 0 V Operating 4.5 2.0 – – – – – 2.9 40 200 50 0.0 – – 5.0 – –