MP6505 4.5V-to-16V,400mA, Single-Phase Brushless-DC–Motor Driver The Future of Analog IC Technology DESCRIPTION The MP6505 is a single-phase brushless-DC– motor driver, with an input voltage range of 4.5V to 16V and a maximum output current of 400mA. The MP6505 controls the rotational speed through either the input voltage or the PWM signal. Other features include minimumrotational–speed set, a rotational speed indicator, built-in input over-voltage protection, built-in locked-rotor protection, locked-rotor–state indicator, thermal shutdown, and a 1.2V integrated Hall bias voltage. The MP6505 is available in 5.0mm×6.4mm TSSOP16 and 3mm×3mm QFN16 package. FEATURES Operating Voltage of 4.5V to 16V Integrated Power MOSFETs (HS: 370mΩ; LS: 230mΩ) Maximum Output Current 400mA Low Quiescent Current (Not including Hall Sensor) of 1.4mA Speed Control by Input Voltage or PWM Signal Programmable Minimum Speed Rotational-Speed Indicator Locked-Rotor Indicator Locked-Rotor Protection and Automatic Recovery Thermal Protection and Automatic Recovery Built-In Input OVP and Automatic Recovery Hall Bias Voltage(1.2V) Integrated Available in TSSOP16 (5.0×6.4mm) and QFN16 (3×3mm) Package APPLICATIONS CPU Fan for Personal Computers or Servers Brushless DC Motor Driver All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP6505 Rev.1.0 3/14/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 1 MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER ORDERING INFORMATION Part Number MP6505DM* MP6505DQ** Package TSSOP16(5.0×6.4mm) QFN16(3×3mm) Top Marking MP6505 ADB * For Tape & Reel, add suffix –Z (eg. MP6505DM–Z); For RoHS compliant packaging, add suffix –LF (e.g. MP6505DM–LF–Z) * For Tape & Reel, add suffix –Z (eg. MP6505DQ–Z); For RoHS compliant packaging, add suffix –LF (e.g. MP6505DQ–LF–Z) PACKAGE REFERENCE TOP VIEW TSSOP16 QFN16 ABSOLUTE MAXIMUM RATINGS(1) VCC ...................................................... 0V to 20V OUT1, OUT2 ...................................... -1V to 20V FG, RD ............................................ -0.3V to 18V All other Pins .................................. -0.3V to 6.5V (2) Continuous Power Dissipation (TA = 25°C) TSSOP16 ................................................. 1.17W QFN16 ..................................................... 1.75W Junction Temperature ...............................150°C Storage Temperature ............... -55°C to +150°C Recommended Operating Conditions (3) VCC ................................................... 4.5V to 16V VTH ....................................................... 0V to 6V IN+, IN- .............................................. 0.2V to 3V Operating Junction Temp. (TJ). -40°C to +125°C MP6505 Rev.1.0 3/14/2012 Thermal Resistance (4) θJA θJC TSSOP16 (5.0×6.4mm) .......... 90 ...... 30 ... °C/W QFN16 (3×3mm) ..................... 60 ...... 12 ... °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions.(For Vcc voltage range, it doesn’t include the external input diode voltage drop) 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 2 MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER ELECTRICAL CHARACTERICS TA=25°C, VCC=12V, unless otherwise noted. Parameter Circuit Current in Locked-Rotor Protection Mode Reference Voltage HB Voltage COSC HIGH Voltage COSC LOW Voltage COSC Oscillator Frequency CT Pin HIGH Voltage CT Pin LOW Voltage ICT Charge Current ICT Discharge Current ICT Charge/Discharge Ratio High-Side Switch-On Resistance Symbol Low-Side Switch-On Resistance RDS2 Current Limit Gain Current Limit VREF VHB VCOSC H VCOSC L fCOSC VCTH VCTL ICT1 ICT2 rCT RDS1 Min Typ Max Unit VCC=20V 1.0 1.4 2 mA IVREF=5mA IHB=5mA 5.6 1.1 3.45 1.8 26.4 3.4 1.63 1.1 0.08 7 6.2 1.2 3.75 2.1 35.6 3.86 1.83 2.85 0.25 18 420 V V V V kHz V V μA μA VCC=12V TA=25°C 5.9 1.15 3.6 1.95 31 3.63 1.73 1.95 0.16 12 370 VCC=12V TA=25°C 230 260 mΩ CP=100pF GC IPEAK Under-Voltage Lockout Threshold— Rising Under-Voltage Lockout Threshold— Hysteresis RD/FG Output Pin Low-Level Voltage RD/FG Output Pin Leakage Current OVP Threshold Rising OVP Threshold Hysteresis MP6505 Rev.1.0 3/14/2012 ICC Condition 9 A/V A IN+ – IN- =±50mV 0.45 0.8 IN+ – IN- =±100mV 0.9 1.3 3.57 3.75 3.93 190 VRDL/FGL IRD/FG=5mA VRDL/FGL VRD/FG=12V 19 mΩ 0.1 20 1.7 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. V mV 0.35 V 1 21 μA V V 3 MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER PIN FUNCTIONS Pin # (TSSOP16) Pin # (QFN16) Name Description 1,16 2 3 4 5 13,15 16 14 1 2 P-GND OUT1 VCC RMI VTH 6 3 COSC 7 4 FG 8 5 RD 9 10 11 12 6 7 8 9 IN+ HB INVREF 13 10 CT 14 15 11 12 Exposed Pad S-GND OUT2 Power Ground. Motor Driver Output 1. Power Supply. Minimum Rotational Speed Set. Rotational Speed Control. Use DC voltage or PWM signal. Oscillator Setting. Connect this pin to an external capacitor to set the switch frequency. Rotational Speed Detector. Connect to an external power source through a pull-up resistor. Locked-Rotor Protection Detector. Connect to an external power source through a pull-up resistor. Hall Sensor Input+. For rotor position detection and current limit setting. Hall Sensor Bias Regulator Output. Powers the external Hall sensor. Hall Sensor Input-. For rotor position detection and current limit setting. Reference Voltage Output. Locked-Rotor Protection and Recovery Time Set. Connect to an external capacitor to set the recovery time. Ground for Control Circuit. Motor Driver Output 2. Not Connected. Connect exposed thermal pad to power ground for better thermal performance. MP6505 Rev.1.0 3/14/2012 NC www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 4 MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER TYPICAL CHARACTERISTICS VIN=12V, fCOSC=30kHz UVLO vs. Temperature ICC vs. Temperature 3.75 VCC Breakdown Voltage vs. Temperature 1.60 26.0 1.55 25.0 ICC (mA) UVLO (V) 3.73 3.72 3.71 VCC BV (V) 25.5 3.74 1.50 24.5 24.0 23.5 1.45 23.0 1.40 -40 -20 0 22.0 -40 -20 22.5 3.70 -40 -20 0 20 40 60 80 100 120 140 VHB vs. Temperature 1.17 6.000 1.166 5.975 1.162 5.950 1.158 31.0 VHB (V) FREQUENCY (kHz) 31.5 30.5 30.0 1.154 1.150 1.146 1.142 MP6505 Rev.1.0 3/14/2012 0 20 40 60 80 100120140 1.13 -40 -20 0 5.900 5.875 5.825 1.134 29.0 -40 -20 5.925 5.850 1.138 29.5 0 20 40 60 80 100120 140 VREF vs. Temperature VREF (V) 32.0 Frequency vs. Temperature 20 40 60 80 100 120140 20 40 60 80 100 120140 5.800 -40 -20 0 20 40 60 80 100 120 140 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 5 MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER TYPICAL PERFORMANCE CHARACTERISTICS fCOSC=30kHz, CT=1μF, VTH=0V, VIN=12V, CIN=10μF, Lmotor=5mH, Rmotor=10Ω, TA=25°C, unless otherwise noted. Steady State VOUT1 10V/div. VOUT2 10V/div. VOUT1 10V/div. VOUT2 10V/div. VRD 5V/div. VFG 5V/div. IOUT 1A/div. Power Ramp Up Locked-rotor Protection IOUT 1A/div. VOUT1 10V/div. VOUT2 10V/div. VIN 10V/div. IOUT 2A/div. Power Ramp Down VOUT1 10V/div. VOUT2 10V/div. VIN 10V/div. IOUT 1A/div. MP6505 Rev.1.0 3/14/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 6 MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER BLOCK DIAGRAM Figure 1: Functional Block Diagram MP6505 Rev.1.0 3/14/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 7 MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER FUNCTION DESCRIPTION Motor Driver OUT1 and OUT2 pins drive the motor. The maximum total continuous output current is 400mA at room temperature. The peak output current value is proportional to the Hall sensor output voltage of (VIN+–VIN-). Working Mode The driver has operates in one of four modes under normal conditions, as shown in Figure 2. The following describes each mode: Frequency Setting A capacitor at the COSC pin sets the frequency. For most applications, use a 100pF capacitor for an oscillator/typical PWM frequency of 30kHz. At low temperatures, VTH exceeds RMI. The device compares VCOSC against RMI to generate a PWM signal, PWM-RMI, to control the motor speed. Removing the thermistor causes VTH and the motor speed to reach their respective maxima and minima. Minimum Speed The voltage on RMI pin sets the minimum PWM duty cycle, which sets the lowest speed. Connect to VTH if not used. Locked-Rotor Detection The RD pin is the locked-rotor detector, and is the output of an open collector. It goes low when the motor rotates and goes into high impendence if the motor is in a locked-rotor state. Leave it open if not used. Speed Detection The FG pin is the rotational speed detector, and is the output of an open collector. It outputs a high or low voltage relative to the Hall comparator’s output. Higher speeds produce higher-frequency signals. Leave it open if not used. Current Limit and the Hall Signal An internal amplifier with hysteresis amplifies the differential Hall signal: The output of this amplifier serves as the current-limit value. The differential Hall voltage drops to 0V whenever an opposing magnet passes the Hall sensor to limit the peak current during commutation. The Hall sensor is directly powered by a 1.2V voltage on the HB pin. Input Over-Voltage Protection The reverse current generated with every commutation charges the input capacitor and causes a periodic voltage spike at the input pin. The internal input over-voltage protection (OVP) circuit turns off two HS switches when a spike exceeds 20V, and recovers from OVP when the spike is less than 18V. MP6505 Rev.1.0 3/14/2012 Minimum Speed Mode This mode runs the motor at the slowest motor speed. It uses a thermistor to provide the VTH signal and compares it against RMI to determine the slowest motor speed. Variable Speed Mode When the VTH signal falls below RMI, the device compares VCOSC against VTH to generate a PWM signal of PWM-VTH to control the motor speed. In general, VTH controls the PWM duty cycle, and therefore the motor speed. Full-Speed Mode When the VTH signal is less than VCOSC(MIN), the PWM duty is 100% and the motor speed is at its maximum. Locked-Rotor–Protection Mode An internal current source, ICT1, charges the capacitor at the CT pin; changing the Hall comparator’s output provides a reset signal to drive an internal switch to discharge this capacitor to VCTL. If the motor rotor is locked, the Hall comparator’s output will not change. Once the voltage on the capacitor goes to VCTH, the driver enters locked-rotor–protection mode and another current source, ICT2, discharges the CT capacitor. During this period, the PWM duty cycle goes to 0% and the RD pin is in a high-impedance state. When the voltage on the capacitor drops to 0V, ICT1 charges the capacitor again. The PWM signal resumes switching to try to drive motor again. If the rotor remains locked, the process repeats. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 8 MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER VTH Vcosc(max) 3.6V RMI Vcosc 2V Vcosc(min) Minimum speed mode Variable speed mode Locked-rotor protection mode Full speed mode FG VCTH(3.6V) CT VCTL(1.7V) RD High impedance High impedance High impedance Low level Ton Rotating Toff Lock protection mode (Toff=5Ton) Figure 2: Driver Operation Mode MP6505 Rev.1.0 3/14/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 9 MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER APPLICATION INFORMATION Selecting the Input Capacitor The input capacitor absorbs excess armature inductor energy with every commutation. For typical applications, select CIN≥10µF to provide a margin of safety for input OVP. Motors with larger armature inductors require larger input capacitors. DESIGN EXAMPLE Below is an example design that follows the application guidelines for the given specifications: VIN 4.5V to 16V IOUT(Max) 400mA fCOSC 30kHz Setting the Frequency For most applications, use a 100pF capacitor for the CP capacitor to set the frequency to 30kHz. fCOSC is determined by: Figure 4 shows a detailed application schematic. For more applications, please refer to the related Evaluation Board Data Sheets. fOSC 3 10 6 / CP (Hz) Connecting the Motor Figure 3 shows that the OUT1 and OUT2 connect to the motor armature: When VIN+ exceeds VIN-, SW1 and SW4 activate and current flows from OUT1 to OUT2; When VIN- exceeds VIN+, SW2 and SW3 activate and current flows from OUT2 to OUT1. The opposing current directions generate opposing polarities in the armature winding. For most applications, carefully connect OUT1 and OUT2 to the motor terminators according to the Hall sensor setting position. Incorrect connections will cause abnormal motor function. Figure 4: Detailed Application Schematic Figure 3: Power Stage MP6505 Rev.1.0 3/14/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 10 MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER PACKAGE INFORMATION QFN 16 (3X3mm) 2.90 3.10 0.30 0.50 PIN 1 ID MARKING 0.18 0.30 2.90 3.10 PIN 1 ID INDEX AREA 1.50 1.80 13 16 12 PIN 1 ID SEE DETAIL A 1 1.50 1.80 0.50 BSC 4 9 5 8 TOP VIEW BOTTOM VIEW PIN 1 ID OPTION A 0.30x45º TYP. PIN 1 ID OPTION B R0.20 TYP. 0.80 1.00 0.20 REF 0.00 0.05 DETAIL A SIDE VIEW 2.90 1.70 0.70 0.25 NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE0.10 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO-220, VARIATION VEED-4. 5) DRAWING IS NOT TO SCALE. 0.50 RECOMMENDED LAND PATTERN MP6505 Rev.1.0 3/14/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 11 MP6505-SINGLE-PHASE, BRUSHLESS-DC–MOTOR DRIVER PACKAGE INFORMATION TSSOP16 (5.0X6.4mm) NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP6505 Rev.1.0 3/14/2012 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 12