A3949SLB

A3949 DMOS Full-Bridge 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: June 2, 2014 Recommended Substitutions: A3950SLPTR-T For existing customer transition, and for new customers or new applications, contact Allegro Sales. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, LLC 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, LLC. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. A3949 DMOS Full-Bridge Motor Driver Features and Benefits Description ▪ Single supply operation ▪ Very small outline package ▪ Low RDS(ON) outputs ▪ Sleep function ▪ Internal UVLO ▪ Crossover current protection ▪ Thermal shutdown protection 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. Packages: Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of VBB and VCP , and crossover current protection. The A3949 is supplied in a power package, a 16-pin plastic SOIC with a copper batwing tab (part number suffix LB). The packages are lead (Pb) free, with 100% matte tin leadframes. Package LB, 16-pin SOIC with internally fused pins Not to scale Functional Block Diagram .22 μF 25 V 0.1 μF VREG Low Side Gate Supply CP1 OSC Charge Pump CP2 VCP 0.1 μF VBB Load Supply MODE 0.1 μF PHASE OUTA Control Logic OUTB ENABLE SENSE SLEEP DMOS Full Bridge GND GND 29319.47i 100 μF A3949 DMOS Full-Bridge Motor Driver Selection Guide Part Number A3949SLBTR-T Package Packing 16-pin, SOIC 1000 per reel Absolute Maximum Ratings Characteristic Symbol Load Supply Voltage VBB Logic Input Voltage VIN Sense Voltage Notes Peak < 2 μs IOUT V 38 V V 0.5 V ±2.8 A 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. Operating Ambient Temperature TA –20 to 85 ºC Maximum Junction Temperature TJ(max) 150 ºC Tstg –55 to 150 ºC Storage Temperature Range S Units 36 –0.3 to 7 VSENSE Output Current, Repetitive Rating Package Thermal Characteristics* Characteristic Symbol RθJA Note Package Thermal Resistance Measured on 2-layer PCB with 2 in. 2-oz. copper each side *Additional information is available on the Allegro website. 2 Rating Units 52 °C/W Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 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 IIN(1) VIN = 2.7 V – 27 50 μA IIN(0) VIN = 0.8 V –