Data Sheet 29319.47C A3949 DMOS Full-Bridge Motor Driver A3949SLB SOIC Scale 1:1 N/C 1 16 N/C MODE 2 15 VREG PHASE 3 14 VCP GND 4 13 GND SLEEP 5 12 CP2 ENABLE 6 11 OUTA 7 10 OUTB SENSE 8 9 CP1 VBB A3949SLP TSSOP Scale 1:1 N/C 1 16 N/C MODE 2 15 VREG PHASE 3 14 VCP GND 4 13 GND SLEEP 5 12 CP2 ENABLE 6 11 CP1 OUTA 7 10 OUTB SENSE 8 9 VBB Designed for PWM (pulse width modulated) control of dc motors, the A3949 is capable of peak output currents to ±2.8 A and operating voltages to 36 V. 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. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of VBB and VCP , and crossover current protection. The A3949 is supplied in a choice of two power packages, a 16-pin plastic SOIC with a copper batwing tab (part number suffix LB), and a low profile (1.1mm) 16-pin TSSOP (suffix LP) with exposed power tab. Both packages are available in a lead-free version (100% matte tin leadframe). ABSOLUTE MAXIMUM RATINGS Load Supply Voltage VBB...............................................................36 V VBB (Peak < 2 µs) ........................................38 V Output Current, IOUT (Repetitive)1 ....................±2.8 A Sense Voltage, VSENSE .........................................0.5 V Logic Input Voltage, VIN ..................... –0.3 V to 7 V Package Power Dissipation, PD A3949SLB2 ......................................... 52ºC / W A3949SLP3 .......................................... 34ºC / W Operating Temperature Range Ambient Temperature, TA.............–20°C to +85°C Junction Temperature, TJ..................+150°C Max. Storage Temperature, 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 IOUT or TJ. 2 Measured on a typical two-sided PCB with 2 in.2 copper ground plane. 3 Measured on a JEDEC-standard "High-K" 4-layer PCB. FEATURES Single supply operation Very small outline package Low RDS(ON) outputs Sleep function Internal UVLO Crossover current protection Thermal shutdown protection Use the following complete part numbers when ordering: 1 Part Number Package Description A3949SLB 16-pin, SOIC Copper batwing tab A3949SLB-T 16-pin, SOIC Copper batwing tab; Lead-free A3949SLP 16-pin, TSSOP Exposed thermal pad A3949SLP-T 16-pin, TSSOP Exposed thermal pad; Lead-free Data Sheet 29319.47C A3949 DMOS Full-Bridge Motor Driver Functional Block Diagram .22 µF 25 V 0.1 µF VREG CP1 Low Side Gate Supply CP2 VCP Charge Pump OSC 0.1 µF Load Supply VBB MODE 0.1 µF 100 µF PHASE OUTA Control Logic OUTB ENABLE SENSE DMOS Full Bridge SLEEP GND GND Control Logic Table PHASE ENABLE MODE SLEEP OUTA OUTB Function 1 1 X 1 H L Forward 0 1 X 1 L H Reverse X 0 1 1 L L Brake (slow decay) 1 0 0 1 L H Fast decay SR* 0 0 0 1 H L Fast decay SR* X X X 0 Hi-Z Hi-Z Sleep mode * To prevent reversal of current during fast decay SR (synchronous rectification), the outputs go to the high impedance state as the current approaches zero. www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 2 Data Sheet 29319.47C A3949 DMOS Full-Bridge Motor Driver ELECTRICAL CHARACTERISTICS at TA = 25°C, VBB = 8 V to 36 V (unless otherwise noted) Characteristics Min. Typ. Max. Units Source driver, IOUT = –2.8 A, TJ= 25°C – .4 .48 Ω Source driver, IOUT = –2.8 A, TJ= 125°C – .68 – Ω Sink driver, IOUT = 2.8 A, TJ= 25°C – .3 .43 Ω Sink driver, IOUT = –2.8 A, TJ= 125°C – .576 – Ω Source diode, IF = –2.8 A – 1.1 1.3 V Sink diode, IF = 2.8 A – 1 1.3 V fPWM < 50 kHz – 6 8.5 mA Charge pump turned on; outputs disabled – 3 4.5 mA Sleep mode – – 10 µA VIN(1) 2.0 – – V VIN(0) – – 0.8 V Logic Input Voltage SLEEP VIN(1) 2.7 – – V VIN(0) – – 0.8 V Logic Input Current PHASE, MODE pins IIN(1) VIN = 2.0 V – < 1.0 20 µA IIN(0) VIN = 0.8 V – < –2.0 –20 µA Logic Input Current ENABLE pin IIN(1) VIN = 2.0 V – 40 100 µA IIN(0) VIN = 0.8 V – 16 40 µA Logic Input Current SLEEP pin IIN(1) VIN = 2.7 V – 27 50 µA IIN(0) VIN = 0.8 V – <1 10 µA From PWM change to source or sink turn on – 600 – ns From PWM change to source or sink turn off – 100 – ns – 500 – ns – 6 – V – 250 – mV TJ – 170 – °C ∆TJ – 15 – °C Output-On Resistance Body Diode Forward Voltage Motor Supply Current Logic Input Voltage PHASE, ENABLE, MODE Propagation Delay Times Crossover Delay Symbol RDSON VF IBB tpd Test Conditions tCOD Protection Circuitry UVLO Enable Threshold VBB rising UVLO Hysteresis Thermal Shutdown Temp. Thermal Shutdown Hysteresis www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3 Data Sheet 29319.47C A3949 DMOS Full-Bridge Motor Driver PWM Control Timing Diagram SLEEP ENABLE PHASE MODE VBB OUTA 0V VBB OUTB 0V IOUT 0A A 1 2 3 4 5 6 7 8 9 VBB VBB 6 7 OUTB OUTA 1 OUTA OUTB 5 9 3 2 8 4 A Charge pump and VREG power-up delay (approximately 200 us) www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 4 Data Sheet 29319.47C A3949 DMOS Full-Bridge Motor Driver Functional Description VREG. This supply voltage is used to operate the sinkside DMOS outputs. VREG is internally monitored and in the case of a fault condition, the outputs of the device are disabled. The VREG pin should be decoupled with a 0.22 µF capacitor to ground. Charge Pump. The charge pump is used to generate a supply above VBB to drive the source-side DMOS gates. A 0.1 uF ceramic monolithic capacitor should be connected between CP1 and CP2 for pumping purposes. A 0.1 uF ceramic monolithic capacitor should be connected between VCP and VBB to act as a reservoir to run the high side DMOS devices. The VCP voltage is internally monitored, and in the case of a fault condition, the outputs of the device are disabled. Shutdown. In the event of a fault due to excessive junction temperature, or low voltage on VCP or VREG, the outputs of the device are disabled until the fault condition is removed. At power-up, the UVLO circuit disables the drivers. Sleep Mode. Control input SLEEP is used to minimize power consumption when the A3949 is not in use. This disables much of the internal circuitry, including the low-side gate supply and the charge pump. A logic low on this pin puts the device into Sleep mode. A logic high allows normal operation. After coming out of Sleep mode, the user should wait 1 ms before applying PWM signals, to allow the charge pump to stabilize. Braking. The braking function is implemented by driving the device in slow decay mode via the MODE pin, and applying an enable chop command. Because it is possible to drive current in both directions through the DMOS switches, this configuration effectively shorts out the motor-generated BEMF, as long as the enable chop mode is asserted on the ENABLE pin. The maximum current can be approximated by VBEMF / RL. Care should be taken to insure that the maximum ratings of the device are not exceeded in worse case braking situations of high speed and high inertial loads. www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 5 Data Sheet 29319.47C A3949 DMOS Full-Bridge Motor Driver Terminal List Table Name Description Number TSSOP-16 SOIC-16 Not used 1 1 MODE Logic input 2 2 PHASE Logic input for direction control 3 3 Ground 4* 4* SLEEP Logic input 5 5 ENABLE Logic input 6 6 Output A for full bridge 7 7 Power return 8 8 Load supply voltage 9 9 OUTB Output B for full bridge 10 10 CP1 Charge pump capacitor 11 11 CP2 Charge pump capacitor 12 12 GND Ground 13* 13* VCP Reservoir capacitor 14 14 Low side gate supply decoupler 15 15 Not used 16 16 N/C GND OUTA SENSE VBB VREG N/C *For the TSSOP package, connect pins 4 and 13 to the exposed thermal pad via the PCB layout. In the SOIC package, the pins are internally connected. www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 6 Data Sheet 29319.47C A3949 DMOS Full-Bridge Motor Driver A3949SLB 16-Pin Batwing SOIC .406 10.31 .398 10.11 8” 0” 16 .011 0.28 .009 0.23 .299 7.59 .291 7.39 .040 1.02 .020 0.51 .414 10.52 .398 10.11 1 2 .020 0.51 .014 0.36 .104 2.64 .096 2.44 .050 1.27 BSC .026 0.66 REF .012 0.30 .004 0.10 Dimensions in inches Metric dimensions (mm) in brackets, for reference only Leads 4 and 13 are connected inside the device package. A3949SLP 16-Pin TSSOP 5.1 4.9 0.201 0.193 8” 0” 16 0.20 0.008 0.09 0.004 4.5 0.177 4.3 0.169 A 6.6 0.260 6.2 0.244 3 0.118 BSC 1 0.039 REF 1 2 3 0.118 BSC .75 .45 0.030 0.018 .25 0.010 BSC Seating Plane Gauge Plane .30 .19 0.012 0.007 .65 .026 BSC 1.20 0.047 MAX .15 0.006 .00 0.000 Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only A Exposed thermal pad (bottom surface) No internal connection of leads for thermal dissipation. NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Lead spacing tolerance is non-cumulative. www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 7 Data Sheet 29319.47C A3949 DMOS Full-Bridge Motor Driver The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copyright©2003, 2004 AllegroMicrosystems, Inc. www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 8