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| A1441 Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Element Commutation The A1441 is a full-bridge motor driver designed to drive low-voltage bipolar brushless dc motors. Commutation of the motor is achieved by use of a single Hall element sensor to detect the position of an alternating-pole ring magnet. A high density merged Bipolar-CMOS semiconductor process allows the integration of the Hall element on the same IC as the motor control circuitry, providing a single-chip solution for enhanced reliability. All necessary circuitry is incorporated within the device package, eliminating the need for any external support components. A micropower sleep mode can be enabled by an external signal, to reduce current consumption for battery management in portable electronic devices. In addition, the device offers an active function for motor braking. The A1441 is optimized for vibration motor applications such as cellular phones, pagers, electronic toothbrushes, and hand-held video game controllers. These devices also drive low power fan motors designed with cogging plates. The small package outline and low profile make this device ideally suited for use in applications where printed circuit board area and component headroom are at a premium. It is available in a lead (Pb) free (leadframe plating 100% matte tin) 6-pin MLP microleadframe package for surface mount, with exposed pad for enhanced thermal dissipation. Package EL, 6-pin Surface Mount MLP 6 5 4 1 2 3 Package EL 2 x 2 mm Approximate Actual Size Features and Benefits Single-chip solution for high reliability ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD ......................................... 5.0 V Reverse Battery Voltage, VRDD ....................... -0.3 V Output Voltage, VOUT ............-0.3 V to VDD + 0.3 V Control Input Voltage,VIN(High) -0.3 V to VDD + 0.3 V Load Current*, ILOAD ............................... 150 mA Magnetic Flux Density, B ........................ Unlimited Operating Temperature Ambient, TA, Range S .................. -20C to 85C Maximum Junction, TJ(max)........................165C Storage Temperature, TS .................. -65C to 170C *Positive ILOAD flow is from VOUT1 to VOUT2. Chopper stabilization technique for precise signal response over operating range 2.0 to 4.0 V operation Sleep mode pin allowing external logic signal enable/disable to reduce average power consumption Restart feature Small package size Use the following complete part numbers when ordering: Part Number A1441SELLT-T Package 2x2x0.50 mm Packing 7-in. Reel, 3000 pieces/reel Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com A1441-DS A1441 Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Element Commutation Functional Block Diagram Package EL, 2 x 2 mm, 6-pin Surface Mount MLP Terminal List Table Pin 1 2 3 4 5 6 Name VDD SLEEP NC GND VOUT1 VOUT2 Function Supply voltage Toggle Sleep/Enabled modes No connection Ground First output Second output Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 2 A1441-DS A1441 Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Element Commutation DEVICE CHARACTERISTICS over the voltage and temperature operating range, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Supply Voltage VDD Running 2.0 - 4.0 ILOAD = 70 mA, VDD = 3.6 V - 300 - VOUT(Sat) ILOAD = 100 mA, VDD = 3.6 V - 450 - Total Output Saturation Voltage1 ILOAD = 70 mA, VDD = 2.2 V - 400 - - - 10 Sleep Mode Supply Current IDD(Sleep) 2 Load Current Rise Time tr(ILOAD) VDD = 3.6 V - 10 - Chopping Settling Time3 ts(CHOP) - 30 - VINLO - - 0.5 Input Threshold SLEEP VINHI VDD-0.7 - - - - 1 IIN Input Current SLEEP Crossover Dead Time4 tDT VOUT switching - 2 - Restart Delay5 tRS - 100 - BOP - 35 75 Magnetic Switchpoints BRP -75 -35 - BHYS BOP - BRP; BOP > BRP - 70 - VOUT1 B LOW HIGH Startup Polarity HIGH VOUT2 LOW 1Either V OUT(Sat) = VQ1(Sat) + VQ4(Sat) or VOUT(Sat) = VQ2(Sat) + VQ3(Sat). Total output saturation voltage is a sum of the voltages across the active output transistors. 2Time period required for current to change from 10% to 90% of it's value. 3Chopping settling time is the required time to have valid device output after power up of the device. 4Crossover dead time is a time period during which all output transistors are switched off. 5Restart delay is a time period during which only one pair of the output transistors is switched on. Units V mV mV mV A s s V V A s ms G G G - - - - A1441-DS Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 3 A1441 Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Element Commutation Package EL, 6-Pin MLP E 1.00 .0394 6 E 1.00 .0394 E 2.00 .079 BSC A 1 2 0.32 .013 0.20 .008 0.50 .020 BSC 0.50 .020 NOM 0.15 .006 MIN 6 0.32 .013 MIN 0.35 .014 0.15 .006 0.55 .022 0.45 .018 0.15 .006 REF 0.05 .002 0.00 .000 1 2 Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only A Pin index area B Exposed thermal pad C Optional thermal vias, 0.30 [.012], pitch 1.2 [.047] D Typical pad layout; adjust as necessary to meet application process requirements E Hall element (not to scale), controlling dimension C 0.20 .008 REF D 1 1.100 .043 MAX 2.40 .094 REF R0.200 .008 REF B 1.100 .043 0.850 .033 inches 6 0.50 .020 BSC 1.550 .061 1.300 .051 1.550 .061 BSC The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other 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 (c) 2005, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 4 A1441-DS |
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