LM4570 LM4570 Single-Ended Input Motor Driver Literature Number: SNOSAV2B LM4570 Single-Ended Input Motor Driver General Description Key Specifications The LM4570 is a single supply motor driver for improved sensory experience in mobile phones and other handheld devices. The LM4570 is capable of driving up to 192mA while operating from a 3V supply. Near rail-to-rail output swing under load ensures sufficient voltage drive for most DC motors, while the differential output drive allows the voltage polarity across the motor to be reversed quickly. Reversing the voltage gives the LM4570 the ability to drive a motor both clockwise and counter clock-wise from a single supply. The LM4570 features fast turn on time, and a wide input voltage range for precise speed control. A low power shutdown mode minimizes power consumption. Thermal and output short circuit protection prevents the device from being damaged during fault conditions. High Output Current @ VDD = 3V 192mA Fast Turn On Time @ 3V 2.4ms Quiescent Power Supply Current @ 3V Shutdown Current 1.9mA 0.1A (typ) Features Output Short Circuit Protection High Output Current Capability Wide Output Voltage Range Fast Turn on Time Output Short Circuit Protection Low Power Shutdown Mode Minimum external components Available in space-saving LLP package Applications Mobile Phones PDAs Video Game Systems Typical Application 20186326 FIGURE 1. Typical Motor Driver Application Circuit (c) 2009 National Semiconductor Corporation 201863 www.national.com LM4570 Single-Ended Input Motor Driver July 28, 2009 LM4570 Connection Diagrams Leadless Leadframe Package (LLP) LQ Package LLP Marking 20186327 Top View X - One digit date code TT - Lot traceability G - Boomer Family C8 - LM4570LQ 20186325 Top View Order Number LM4570LQ See NS Package Number LQB08A Ordering Information Order Number Package Package DWG # Transport Media MSL Level Green Status LM4570LQ 8-Pin LLP LQB08A 1000 units on tape and reel 1 RoHS & no Sb/Br LM4570LQX 8-Pin LLP LQB08A 4500 units on tape and reel 1 RoHS & no Sb/Br www.national.com 2 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Note 1) Storage Temperature Voltage at Any Input Pin Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) JA (LLP) 140C/W Operating Ratings 6.0V -65C to +150C Temperature Range TMIN TA TMAX Supply Voltage -0.3V to VDD +0.3V Internally Limited 2000V 200V Electrical Characteristics VDD = 5V 150C -40C TA 85C 2.4V VDD 5.5V (Notes 1, 2) The following specifications apply for VDD = 5V, AV-BTL = 6dB unless otherwise specified. Limits apply for TA = 25C. LM4570 Symbol Units (Limits) Typical Limit (Note 6) (Notes 7, 8) VIN = 0V, IL = 0A, No Load 2.5 5.5 mA (max) VIN = 0V, IL = 0A, RL = 30 2.6 5.5 mA (max) VSD = GND 0.1 1.5 A (max) Parameter Conditions IDD Quiescent Power Supply Current ISD Shutdown Current VIH Logic Input High 1.4 V (min) VIL Logic Input Low 0.4 V (max) VOS Output Offset Voltage 35 mV (max) IOUT Output Current TWU Wake-up time VOH Output High Voltage RL = 30 specified as |VDD - VOH| 146 200 mV (max) VOL Output Low Voltage RL = 30 specified as |GND + VOH| 106 200 mV (max) 5 VOH, VOL 250mV Electrical Characteristics VDD = 3V 268 mA 2.5 ms (max) (Notes 1, 2) The following specifications apply for VDD = 3V, AV-BTL = 6dB unless otherwise specified. Limits apply for TA = 25C. LM4570 Symbol Parameter IDD Quiescent Power Supply Current ISD Shutdown Current VIH Logic Input High VIL Logic Input Low VOS Output Offset Voltage IOUT Output Current TWU Wake-up time Units (Limits) Typical Limit (Note 6) (Notes 7, 8) VIN = 0V, IL = 0A, No Load 1.9 4 VIN = 0V, IL = 0A, RL = 30 1.95 4 VSD = GND 0.1 1.0 A (max) 1.4 V (min) Conditions 5 VOH, VOL 200mV VOH Output High Voltage RL = 30 specified as |VDD - VOH| VOL Output Low Voltage RL = 30 specified as |VDD - VOH| 3 mA (max) 0.4 V (max) 35 mV (max) 192 mA 2.4 ms (max) 90 110 mV (max) 63 110 mV (max) www.national.com LM4570 Junction Temperature (TJMAX) Thermal Resistance Absolute Maximum Ratings (Note 2) LM4570 Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given; however, the typical value is a good indication of device performance. Note 3: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by TJMAX, JC, and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX -TA)/ JA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4570, TJMAX = 150 C and the typical JA for the LLP package is 140C/W. Note 4: Human body model, 100pF discharged through a 1.5k resistor. Note 5: Machine Model, 220pF-240pF discharged through all pins. Note 6: Typicals are measured at 25C and represent the parametric norm. Note 7: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level). Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Note 9: Shutdown current is measured in a normal room environment. Exposure to direct sunlight will increase ISD by a maximum of 2A. www.national.com 4 LM4570 Typical Performance Characteristics Output Low Voltage vs Load Current VDD = 3V Output Low Voltage vs Load Current VDD = 5V 20186313 20186312 Output High Voltage vs Load Current VDD = 3V Output High Voltage vs Load Current VDD = 5V 20186310 20186311 Output Voltage vs Input Voltage VDD = 3V, RL = 20 Output Voltage vs Input Voltage VDD = 3V, RL = 30 20186314 20186315 5 www.national.com LM4570 Output Voltage vs Input Voltage VDD = 5V, RL = 20 Output Voltage vs Input Voltage VDD = 5V, RL = 30 20186316 20186317 Power Dissipation vs Supply Voltage Supply Current vs Supply Voltage 20186320 20186321 Slew Rate vs Supply Voltage RL = 30 Shutdown Supply Current vs Supply Voltage 20186323 20186319 www.national.com 6 Output Transition High to Low, Low to High VDD = 5V, 1V/div, 1s/div 20186306 20186307 Turn-Off Time VDD = 5V, 2V/div, 1ms/div Turn-On Time VDD = 5V, 2V/div, 1ms/div 20186308 20186309 7 www.national.com LM4570 Output Transition High to Low, Low to High VDD = 3V, 1V/div, 400ns/div LM4570 Application Information differential gain of the device. The output voltage is given by the following: BRIDGE CONFIGURATION EXPLANATION The LM4570 uses a bridged architecture that drives a load differentially. The BTL design offers several advantages over a single-ended design. The device outputs, VO1 and VO2, both source and sink current, which means that the polarity of the voltage across the motor can be reversed quickly (Figure 2). A single-ended device would need to operate from split supplies to achieve this behavior. The ability to reverse the voltage polarity is necessary in applications where a negative (reverse polarity) pulse is used to quickly stop the motor. If the drive voltage is just removed from the motor (not reversed) then the motor will continue to spin until the residual energy stored in the windings has dissipated. The output voltage of the LM4570 is determined by the difference between the input voltage and VREF1 , as well as the VO1-VO2 = AVD(VIN-VREF1) For input voltages that are less than the reference voltage, the differential output voltage is negative. For input voltages that are greater than the reference voltage, the differential output voltage is positive. For example, when operating from a 5V supply (VREF1 = 2.5V) and with a differential gain of 6dB, with a 1V input, the voltage measured across VO1 and VO2 is -3V, with a 4V input, the differential output voltage is +3V. 20186302 FIGURE 2. Voltage Polarity and Motor Direction www.national.com 8 VVD = 2 x (RF / RIN) Where AVD is the differential gain. AVD differs from singleended gain by a factor of 2. This doubling is due to the differential output architecture of the LM4570. Driving the load differentially doubles the output voltage compared to a singleended output amplifier under the same conditions. POWER DISSIPATION The Power Dissipation vs. Supply Voltage graph in the Operating Curves section shows the power dissipation of the LM4570 with the input equal to the supply voltage, meaning 20186328 FIGURE 3. Power Dissipation vs. Input Voltage the device as possible. Typical applications employ a regulator with a 10F tantalum or electrolytic capacitor and a ceramic bypass capacitor which aid in supply stability. This does not eliminate the need for bypass capacitors near the LM4570. Place a 1F ceramic capacitor as close to VDD as possible. Place a 0.1F capacitor as close to REF1 as possible. Smaller values of C REF1 may be chosen for decreased turn on times. EXPOSED-DAP MOUNTING CONSIDERATIONS The LM4570 is available in an 8-pin LLP package which features an exposed DAP (die attach paddle). The exposed DAP provides a direct thermal conduction path between the die and the PCB, improving the thermal performance by reducing the thermal resistance of the package. Connect the exposed DAP to GND through a large pad beneath the device, and multiple vias to a large unbroken GND plane. For best thermal performance, connect the DAP pad to a GND plane on an outside layer of the PCB. Connecting the DAP to a plane on an inner layer will result in a higher thermal resistance. Ensure efficient thermal conductivity by plugging and tenting the vias with plating and solder mask, respectively. SHUTDOWN FUNCTION The LM4570 features a low power shutdown mode that disables the device and reduces quiescent current consumption to 0.1A. Driving /SD Low disables the amplifiers and bias circuitry, and drives VREF1and the outputs to GND. Connect / SD to VDD for normal operation. POWER SUPPLY BYPASSING Good power supply bypassing is critical for proper operation. Locate both the REF1 and VDD bypass capacitors as close to 9 www.national.com LM4570 the outputs swing rail-to-rail. This configuration results in the output devices of the LM4570 operating in the linear region, essentially very small resistors determined by the RDS(ON) of the output devices. Under these conditions, the power dissipation is dominated by the I*R drop associated with the output current across the RDS(ON) of the output transistors, thus the power dissipation is very low (60mW for a 800mW output). When the input voltage is not equal to GND or VDD, the power dissipation of the LM4570 increases (Figure 3). Under these conditions, the output devices operate in the saturation region, where the devices consume current in addition to the current being steered to the load, increasing the power dissipation. Power dissipation for typical motor driving applications should not be an issue since the most of the time the device outputs will be driven rail-to-rail. GAIN SETTING The resistors RIN and RF set the gain of the LM4570, given by: LM4570 DEMO BOARD LAYOUT 20186324 www.national.com 10 LM4570 Revision History Rev Date Description 1.0 04/13/06 Initial release. 1.01 07/28/09 Added the Ordering Information table. 11 www.national.com LM4570 Physical Dimensions inches (millimeters) unless otherwise noted LLP Package Order Number LM4570LQ NS Package Number LQB08A www.national.com 12 LM4570 Notes 13 www.national.com LM4570 Single-Ended Input Motor Driver Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Solutions www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL'S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS. EXCEPT AS PROVIDED IN NATIONAL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright(c) 2009 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Technical Support Center Email: support@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Technical Support Center Email: europe.support@nsc.com National Semiconductor Asia Pacific Technical Support Center Email: ap.support@nsc.com National Semiconductor Japan Technical Support Center Email: jpn.feedback@nsc.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI's terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Applications Audio www.ti.com/audio Communications and Telecom www.ti.com/communications Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps DLP(R) Products www.dlp.com Energy and Lighting www.ti.com/energy DSP dsp.ti.com Industrial www.ti.com/industrial Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical Interface interface.ti.com Security www.ti.com/security Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive Microcontrollers microcontroller.ti.com Video and Imaging RFID www.ti-rfid.com OMAP Mobile Processors www.ti.com/omap Wireless Connectivity www.ti.com/wirelessconnectivity TI E2E Community Home Page www.ti.com/video e2e.ti.com Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright (c) 2011, Texas Instruments Incorporated