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A1441 Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Element Commutation
Features and Benefits
Single-chip solution for high reliability 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
Description
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 handheld video game controllers. These devices also drive low power fan motors designed with cogging plates.
Package: 6 Contact MLP/DFN/SON (suffix EL)
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5
4
1
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Approximate Scale 1:1
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Functional Block Diagram
1441-DS, Rev. 2
A1441
Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Element Commutation
a lead (Pb) free (leadframe plating 100% matte tin) 6-pin surface mount MLP (microleadframe: DFN) package, with exposed pad for enhanced thermal dissipation.
Description (continued) The small package outlines and low profiles 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 Selection Guide
Part Number Package Packing1 A1441EELLT-T MLP 2x2 mm; 0.50 mm nom. height 3000 pieces/ 7-in. reel A1441SEKLT-T2 1For additional packing options, contact Allegro. 2These variants are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006.
Absolute Maximum Ratings
Characteristic Supply Voltage Reverse Battery Voltage Output Voltage Control Input Voltage Load Current Magnetic Flux Density Operating Ambient Temperature Maximum Junction Storage Temperature Symbol VDD VRDD VOUT VIN(High) ILOAD B TA TJ(max) Tstg Range E Positive ILOAD flow is from VOUT1 to VOUT2 Notes Rating 5.0 V -0.3 V -0.3 V to VDD + 0.3 V -0.3 V to VDD + 0.3 V 150 mA Unlimited -40C to 85C 165C -65C to 170C
Pin-out Diagram
VDD 1 Sleep Mode Drive Control Control Driver
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VOUT2
SLEEP 2
5
VOUT1
NC 3
4
GND
Terminal List Table
Name VDD SLEEP NC GND VOUT1 VOUT2 Number EL Package 1 2 3 4 5 6 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
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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 I = 100 mA, VDD = 3.6 V - - 500 VOUT(Sat) LOAD Total Output Saturation Voltage1 - - 400 ILOAD = 70 mA, VDD = 2.2 V Sleep Mode Supply Current IDD(Sleep) - - 10 tr(ILOAD) VDD = 3.6 V - 10 - Load Current Rise Time2 3 Chopping Settling Time ts(CHOP) - 30 - VINLO - - 0.5 Input Threshold SLEEP VINHI VDD-0.7 - - IIN - - 1 Input Current SLEEP 4 Crossover Dead Time tDT VOUT switching - 2 - Restart Delay5 tRS - - 225 BOP - 35 75 BRP Magnetic Switchpoints -75 -35 - BHYS BOP - BRP; BOP > BRP - 70 - VOUT1 BBop BBop
LOW HIGH Startup Polarity HIGH VOUT2 LOW 1Either V = VQ1(Sat) + VQ4(Sat) or VOUT(Sat) = VQ2(Sat) + VQ3(Sat). Total output saturation voltage is a sum of the voltages OUT(Sat) 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 A s s V V A s ms G G G - - - -
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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A1441
Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Element Commutation
Package EL, 6 pin MLP/DFN/SON
2.15 .085 1.85 .073 Preliminary dimensions, for reference only (JEDEC ultra-thin MO-229UCCD, except contact layout) Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area B Exposed thermal pad (reference only, terminal #1 identifier appearance at supplier discretion) C Reference land pattern layout; adjust as necessary to meet application process requirements and PCB layout tolerances; when mounting on a multilayer PCB, thermal vias at the exposed thermal pad land can improve thermal dissipation (reference EIA/JEDEC Standard JESD51-5) D Hall element (not to scale) E Active area depth 0.233 [0.0092] U.S. Customary dimensions controlling 4X0.15 .006 MIN 0.50 .020 NOM 6 0.32 .013 NOM R0.20 .008 REF 2X0.15 .006 MIN C 1.00 .039 NOM 1.00 .039 NOM
D 1.00 .0394
A
B
E
6 D
D 1.00 .0394
2.15 .085 1.85 .073 A
1
2 C
6X
0.08 [.003] C 0.32 .013 6X 0.20 .008 0.10 [.004] M C A B 0.05 [.002] M C 0.50 .020 1 2
SEATING PLANE
0.55 .022 0.45 .018 0.15 .006 REF 0.05 .002 0 0.00 .000
0.35 .014 0.15 .006
B
1
6 0.50 .020 NOM 1.45 .057 NOM
1.45 .057 NOM
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, 2006, Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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