A4980KLPTR-T

A4980 Automotive, Programmable Stepper Driver FEATURES AND BENEFITS • • • • • • • • • • • Peak motor current up to ±1.4 A, 28 V Low RDS(on) outputs, 0.5 Ω source and sink, typical Automatic current decay mode detection/selection Mixed, Fast, and Slow current decay modes Synchronous rectification for low power dissipation Internal OVLO, UVLO, and Thermal Shutdown circuitry Crossover-current protection Short circuit, and open load diagnostics Hot and cold thermal warning Stall detect features SPI-compatible or simple Step and Direction motion control • Highly configurable via SPI-compatible serial interface APPLICATIONS • Automotive stepper motors • Engine management • Headlamp positioning PACKAGE: 28-Pin TSSOP with Exposed Thermal Pad (suffix LP) Automotive 12V Power Net Logic Supply ECU The A4980 is a flexible microstepping motor driver with built-in translator for easy operation. It is a single-chip solution, designed to operate bipolar stepper motors in full-, half-, quarter- and sixteenth-step modes, at up to 28 V and ±1.4 A. The A4980 can be controlled by simple Step and Direction inputs, or through the SPI-compatible serial interface that also can be used to program many of the integrated features and to read diagnostic information. The current regulator can be programmed to operate in fixed off-time or fixed frequency PWM, with several decay modes to reduce audible motor noise and increase step accuracy. In addition the phase current tables can be programmed via the serial interface to create unique microstep current profiles to further improve motor performance for specific applications. The current in each phase of the motor is controlled through a DMOS full bridge, using synchronous rectification to improve power dissipation. Internal circuits and timers prevent crossconduction and shoot-through, when switching between highside and low-side drives. The outputs are protected from short circuits, and features for low load current and stalled rotor detection are included. Chip-level protection includes: hot and cold thermal warnings, overtemperature shutdown, and overvoltage and undervoltage lockout. The A4980 is supplied in a 28-pin TSSOP power package with an exposed thermal pad (package type LP). This package is lead (Pb) free with 100% matte-tin leadframe plating. Not to scale Microcontroller or DESCRIPTION CP1 2 VCP VBB VDD STEP OAP DIR MS0 MS1 OAM ENABLE RESETn DIAG REF OBP SDI SDO OBM SCK STRn VREG SENSA SENSB OSC AGND PGND Stepper Motor Automotive 12V Power Net Logic Supply Microcontroller or ECU Serial Interface Control REF OBP SDI SDO OBM SCK STRn VREG SENSA SENSB OSC AGND PGND Parallel Control Typical Applications A4980-DS, Rev. 4 CP1 2 VCP VBB VDD STEP OAP DIR MS0 MS1 OAM ENABLE RESETn DIAG Stepper Motor A4980 Automotive, Programmable Stepper Driver SPECIFICATIONS Selection Guide Part Number Packing* A4980KLP-T 50 pieces per tube A4980KLPTR-T 4000 pieces per reel 4.4 mm × 9.7 mm, 1.2 mm nominal height TSSOP with exposed thermal pad *Contact Allegro™ for additional packing options Absolute Maximum Ratings With respect to GND Characteristic Symbol Load Supply Voltage VBBx Logic Supply Voltage VDD Notes Rating Applies to VBBA and VBBB Unit –0.3 to 50 V –0.3 to 6 V –0.3 to VBB V –0.3 to VBB+8 V –0.3 to 6 V –0.3 to 8.5 V –0.3 to 6 V Pin OSC –0.3 to 6 V Pins MS0, MS1 –0.3 to 6 V Pins SDI, SDO, SCK, STRn –0.3 to 6 V Pin CP1 Pins CP2, VCP Pins STEP, DIR, ENABLE, DIAG Pin VREG Pin RESETn Can be pulled to VBB with 38 kΩ Pin REF Pins OAP, OAM, OBP, OBM Pins SENSA, SENSB Ambient Operating Temperature Range TA Maximum Continuous Junction Temperature TJ(max) Transient Junction Temperature TtJ Storage Temperature Range Tstg Range K; limited by power dissipation Overtemperature event not exceeding 10 s, lifetime duration not exceeding 10 hours, guaranteed by design and characterization –0.3 to 6 V –0.3 to VBB V –0.3 to 1 V –40 to 150 °C 150 °C 175 °C –55 to 150 °C Thermal Characteristics may require derating at maximum conditions Characteristic Symbol Package Thermal Resistance (Junction to Ambient) RθJA Package Thermal Resistance (Junction to Pad) RθJP Value Unit 4-layer PCB based on JEDEC standard Test Conditions* 28 ºC/W 2-layer PCB with 24.52 cm2 of copper area each side 32 ºC/W 2 ºC/W *Additional thermal information available on the Allegro website Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 A4980 Automotive, Programmable Stepper Driver OSC 3.3V VREG CP1 CP2 VDD Oscillator REF RESETn ENABLE + VBBA - OAM SENSA System Control and Registers Bridge Control Logic Gate Drive DMOS Full Bridge VBAT VBBB PWM Control OBP OBM REF 6-bit DAC DIAG VBAT DMOS Full Bridge SENSA PWM Control Serial Interface SDI SDO SCK STRn VCP OAP Translator MS1 MS0 Charge Pump REF DAC 6-bit DAC STEP DIR Regulator + SENSB SENSB Undervoltage, Overvoltage Cold Warning, Hot Warning, Overtemperature Short Detect, Open Load Detect Stall Detect AGND PAD PGND Functional Block Diagram Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 A4980 Automotive, Programmable Stepper Driver Pin-out Diagram and Terminal List Table SENSA 1 28 VBBA STRn 2 27 RESETn ENABLE 25 OAM OSC 5 24 CP 2 23 CP1 22 VCP 21 PGND 20 VREG SDI 6 AGND 7 Ref Charge Pump 26 4 I/O & Control 3 Timer DIR OAP REF 8 SCK 9 VDD 10 VDD 19 STEP OBP 11 18 OBM MS1 12 17 SDO MS0 13 16 DIAG SENSB 14 15 VBBB Reg Pin-out Diagram Terminal List Table Name Number Description AGND 7 Analog reference ground CP2 24 Name Number PGND 21 Power Ground Description Charge pump capacitor terminal REF 8 Reference input voltage RESETn 27 Chip reset SCK 9 Serial data clock CP1 23 Charge pump capacitor terminal DIAG 16 Diagnostic output DIR 3 Direction select input SDI 6 Serial data input ENABLE 26 Bridge enable input SDO 17 Serial data output MS0 13 Microstep select input SENSA 1 Current sense node – bridge A MS1 12 Microstep select input SENSB 14 Current sense node – bridge B OAM 25 Bridge A negative output STEP 19 Step input OAP 4 Bridge A positive output STRn 2 Serial data strobe OBM 18 Bridge B negative output VBBA 28 Motor supply – bridge A OBP 11 Bridge B positive output VBBB 15 Motor supply – bridge B OSC 5 Oscillator input VCP 22 Above supply voltage PAD – Connect exposed tab to ground VDD 10 Logic Supply VREG 20 Regulated voltage Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 A4980 Automotive, Programmable Stepper Driver ELECTRICAL CHARACTERISTICS1,2: valid at TJ = –40°C to 150°C, VBB = 6 to 28 V, VDD = 3 to 5.5 V; unless otherwise noted Characteristics Symbol Test Conditions Min. Typ. Max. Unit Supplies Load Supply Voltage Range3 VBB Load Supply Quiescent Current IBBQ Logic Supply Voltage Range VDD Logic Supply Quiescent Current Charge Pump Voltage Internal Regulator Voltage Internal Regulator Dropout Voltage Functional 0 – 50 V 3.3 – VBBOV V ENABLE = 0 – – 4 mA Sleep mode – 1 10 µA Outputs Driving 3 – 5.5 V ENABLE = 0 – – 5 mA ENABLE=0, VDD > 5 V – – 5.5 mA Sleep mode – 4 15 µA VCP With repect to VBB, VBB >7.5 V, ENABLE = 0, RESETn = 1 – 6.7 – V VREG ENABLE = 0, RESETn = 1, VBB > 7.5 V – 7.2 – V VREGDO ENABLE = 0, RESETn = 1, VBB > 3.5 V – 100 200 mV VBB = 13.5 V, IOUT = –1 A, TJ = 25°C – 500 600 mΩ VBB = 13.5 V, IOUT = –1 A, TJ = 150°C – 900 1100 mΩ VBB = 7 V, IOUT = –1 A, TJ = 25°C – 625 750 mΩ IF = 1 A – – 1.4 V VBB = 13.5 V, IOUT = 1 A, TJ = 25°C – 500 600 mΩ VBB = 13.5 V, IOUT = 1 A, TJ = 150°C – 900 1100 mΩ VBB = 7 V, IOUT = 1 A, TJ = 25°C – 625 750 mΩ IF = –1 A – – 1.4 V ENABLE = 0, RESETn = 1, VO = VBB –120 –65 – µA ENABLE = 0, RESETn = 1, VO = 0 V –200 –120 – µA ENABLE = 0, RESETn = 0, VO = VBB –