A3906SESTR-T

A3906 Low Voltage Stepper and Single/Dual DC Motor Driver Features and Benefits Description ▪ 2.5 to 9 V operation ▪ Internal PWM current limit control ▪ Synchronous rectification for reduced power dissipation ▪ Peak current output flag ▪ Undervoltage lockout ▪ Low RDS(on) outputs ▪ Small package ▪ Brake mode for DC motors ▪ Sleep function ▪ Crossover-current protection ▪ Thermal shutdown Designed for pulse width modulated (PWM) control of low voltage stepper motors, and single and dual DC motors, the A3906 is capable of output currents up to 1 A per channel and operating voltages from 2.5 to 9 V. The A3906 has an internal fixed off-time PWM timer that sets a peak current based on the selection of a current sense resistor. An overcurrent output flag is provided that notifies the user when the current in the motor winding reaches the peak current determined by the sense resistor. The fault output does not affect driver operation. The A3906 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating. Package: 20-contact QFN (suffix ES) Applications include the following: ▪ Digital still cameras (DSC) ▪ Cell phone cameras ▪ USB powered devices ▪ Battery powered devices Approximate size Typical Applications 0.1 μF 0.1 μF CP1 CP2 CP3 CP4 CP1 VCP 0.1 μF 0.1 μF CP2 CP4 CP3 VCP 0.1 μF SLEEP A3906 A3906 IN2 M OUT1B IN4 +5 V SENSE1 VBB 10 μF 10 V IN1 OUT1A IN3 +5 V SLEEP 10 μF 10 V IN1 IN2 0.1 μF VBB OUT1A IN3 OUT1B IN4 SENSE1 M OUT2A M FL1 OUT2B FL2 GND SENSE2 Dual DC motor application 3906-DS, Rev. 4 OUT2A FL1 OUT2B FL2 SENSE2 GND Stepper motor application A3906 Low Voltage Stepper and Single/Dual DC Motor Driver Selection Guide Part Number Packing A3906SESTR-T Package 1500 pieces per 7-in. reel 20-pin QFN with exposed thermal pad Absolute Maximum Ratings Characteristic Symbol Load Supply Voltage VBB Logic Input Voltage Range VIN Sense Voltage VSENSEx Output Current IOUT Output Current in Paralleled Operation IOUT(par) Operating Temperature Range TA Junction Temperature Notes Continuous Pulsed, tw < 1 μs 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. Continuous Peak, DC < 30% Continuous Peak, DC < 30% Range S Rating Units 9.6 V –0.3 to 7 V 0.5 V 1 V 1 A 1.5 A 2 A 2.5 A –20 to 85 °C TJ(max) 150 °C Tstg –40 to 150 °C Storage Temperature Range Thermal Characteristics may require derating at maximum conditions, see application information Characteristic Symbol RθJA Package Thermal Resistance Test Conditions* Value Units 4-layer PCB based on JEDEC standard 37 ºC/W *Additional thermal information available on the Allegro website. Terminal List Table 16 OUT1A 17 VCP 18 CP3 19 CP1 20 CP4 Pin-out Diagram CP2 1 15 SENSE1 GND 2 14 OUT1B SLEEP 3 13 VBB IN1 4 12 OUT2B IN2 5 11 SENSE2 7 8 9 IN4 FL1 FL2 OUT2A 10 6 IN3 PAD Number 1 2 3 4 5 Name CP2 GND SLEEP IN1 IN2 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 – IN3 IN4 FL1 FL2 OUT2A SENSE2 OUT2B VBB OUT1B SENSE1 OUT1A VCP CP3 CP1 CP4 PAD Function Charge pump capacitor terminal 2 Ground Sleep logic input, active low Control input Control input Control input Control input Current limit flag, bridge 1 Current limit flag bridge 2 DMOS full-bridge 2, output A Current sense resistor terminal, bridge 2 DMOS full-bridge 2, output B Supply Voltage DMOS full-bridge 1, output B Current sense resistor terminal, bridge 1 DMOS full-bridge 1, output A Reservoir capacitor terminal Charge pump capacitor terminal 3 Charge pump capacitor terminal 1 Charge pump capacitor terminal 4 Exposed pad for enhanced thermal performance Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 A3906 Low Voltage Stepper and Single/Dual DC Motor Driver Functional Block Diagram 0.1 μF 0.1 μF 10 μF 10 V CP4 CP3 CP2 CP1 VCP 0.1 μF VBB VCP Charge Pump VBB GND Regulator +5 V +5 V OUT1A Sense1 Sense2 OUT1B SLEEP Sense1 SENSE1 FL1 FL2 PWM Latch and Blanking Comparator Bridge 2 VBB IN1 IN2 RS1 VCP PWM Latch and Blanking Comparator Bridge 1 OUT2A OUT2B Control Logic IN3 IN4 Sense2 SENSE2 RS2 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 A3906 Low Voltage Stepper and Single/Dual DC Motor Driver ELECTRICAL CHARACTERISTICS1,2 valid at TA = 25°C and VBB = 2.5 to 9 V, unless otherwise noted Characteristics Symbol Operating Voltage Range VBB VBB Supply Current IBB Output Resistance RDS(on) Current Trip Sense Voltage VSENSE Test Conditions Output Leakage Current Vf IDSS Typ. Max. Units 2.5 – 9 V IOUT = 0 mA, PWM = 50 kHz, Duty Cycle = 50% – 5 – mA IOUT = 0 mA, outputs disabled, VBB = 9.6 V – 3 – mA Sleep mode, VIN < 0.4 V – 150 500 nA Source driver, IOUT = 400 mA , VBB = 3 V, TJ = 25°C – 0.52 0.60 Ω Source driver, IOUT = 400 mA , VBB = 3 V, TJ = 85°C – 0.78 – Ω Sink driver, IOUT = 400 mA, VBB = 3 V, TJ= 25°C – 0.62 0.74 Ω Sink driver, IOUT = 400 mA, VBB = 3 V, TJ= 85°C Clamp Diode Voltage Min. FLx falling edge I = 400 mA Outputs, VOUT = 9 V – 0.93 – Ω 160 200 240 mV – – 1 V –20 – 20 μA Control Logic Logic Input Voltage Logic Input Current Input Hysteresis ¯S¯¯L¯¯E¯¯E¯¯P¯ Input VIN(1) 2.0 – 5.5 V VIN(0) – – 0.8 V IIN(1) VIN = 5.5 V –