TMI8870

TMI8870 TMI8870B TMI8870/B 3.6-A Brushed DC Motor Driver FEATURES ⚫ ⚫ ⚫ ⚫ ⚫ ⚫ ⚫ ⚫ ⚫ ⚫ ⚫ GENERAL DESCRIPTION H-Bridge Motor Driver The TMI8870/B device are the brushed-DC motor Drives One DC Motor, One Winding of a Stepper drivers Motor, or Other Loads equipment, and other small machines. Two logic Wide 6.8V to 45V Operating Voltage inputs control the H-bridge driver, which consists of 3.6-A Peak Current Drive four N-channel MOSFETs that can control motors PWM Control Interface bidirectionally with up to 3.6-A peak current. The Integrated Current Regulation inputs can be pulse width modulated (PWM) to Low-Power Sleep Mode control motor speed, using a choice of current- VM Undervoltage Lockout (UVLO) decay modes. Setting both inputs slow enter a low- Overcurrent Protection (OCP) power sleep mode. - Retry after OCP: TMI8870 The TMI8870/B devices feature integrated current - Latch after OCP: TMI8870B regulation, based on the analog input VREF and the Thermal Shutdown (TSD) voltage on the ISEN pin, which is proportional to Automatic Fault Recovery motor current through an external sense resistor. ESOP8 Small Package and Footprint The ability to limit current to a known level can for significantly ⚫ ⚫ ⚫ reduce appliances, the system industrial power requirements and bulk capacitance needed to APPLICATIONS ⚫ printers, maintain stable voltage, especially for motor Printers startup and stall conditions. Appliances The devices are fully protected from faults and Industrial Equipment short circuits, including UVLO，OCP, and TSD. Other Mechatronics Applications TYPICAL APPILCATION VM: 6.8V to 45V IN1 Controller IN2 TMI8870 TMI8870B BDC Brushed DC Motor Driver VREF Current regulations ISEN Fault protection Figure 1. Basic Application Circuit TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 www.toll-semi.comwww.suntosemi.com 1 TMI8870 TMI8870B ABSOLUTE MAXIMUM RATINGS (Note 1) Parameter Value Unit Power supply voltage (VM) -0.3~45 V Logic input voltage (IN1, IN2) -0.3~6 V Reference input pin voltage (VREF) -0.3~6 V Continuous phase node pin voltage (OUT1, OUT2) -0.7~(VM+0.7) V Current sense input pin voltage (ISEN) -0.5~1 V Output current (100% duty cycle) 0~3.5 A Operating junction temperature (Note 2) -40~150 °C Storage temperature -65~150 °C PACKAGE/ORDER INFORMATION GND 1 IN2 2 IN1 3 8 OUT2 7 ISEN Exposed Pad VREF 4 6 OUT1 5 VM ESOP8 Top Mark: T8870/YYXXX (T8870: Device Code, YYXXX: Inside Code) T8870B/YYXXX (T8870B: Device Code, YYXXX: Inside Code) Part Number Package Top mark Quantity/ Reel TMI8870 ESOP8 T8870/YYXXX 3000 TMI8870B ESOP8 T8870B/YYXXX 3000 TMI8870 and TMI8870B devices are Pb-free and RoHS compliant. www.toll-semi.comwww.suntosemi.com 2 TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 TMI8870 TMI8870B PIN FUNCTIONS Pin Name Function 1 GND Logic ground. Connect to board ground 2 IN2 Logic inputs. Controls the H-bridge output. Has internal pulldowns. 3 IN1 Logic inputs. Controls the H-bridge output. Has internal pulldowns. 4 VREF 5 VM 6 OUT1 Analog input. Apply a voltage between 0.3V to 5V. 6.8V to 45V power supply. Connect a 0.1μF bypass capacitor to ground, as well as sufficient bulk capacitance, rated for the VM voltage. H-bridge output. Connect directly to the motor or other inductive load. High-current ground path. If using current regulation, connect ISEN to a resistor (low- 7 ISEN value, high-power-rating) to ground. If not using current regulation, connect ISEN directly to ground. 8 OUT2 H-bridge output. Connect directly to the motor or other inductive load. ESD RATING Items Description Value Unit VESD Human Body Model for all pins ±2000 V JEDEC specification JS-001 RECOMMENDED OPERATING CONDITIONS Items Description Min Max Unit VM Power supply voltage range 6.8 45 V TJ Operating Junction Temperature Range -40 125 °C TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 www.toll-semi.comwww.suntosemi.com 3 TMI8870 TMI8870B ELECTRICAL CHARACTERISTICS TA = 25°C, over recommended operating conditions unless otherwise noted.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT 45 V POWER SUPPLY (VM) VM operating voltage VM 6.8 VM operating supply current IVM VM = 12V VM sleep current IVMSLEEP VM = 12V Turn-on time (Note 3) tON 3 mA 1 VM > VUVLO with IN1 or 30 IN2 high µA µs LOGIC-LEVEL INPUTS (IN1, IN2) Input logic low voltage VIL 0.5 Input logic high voltage VIH Input logic hysteresis VHYS Input logic low current IIL VIN = 0V Input logic high current IIH VIN = 3.3V 62 μA Pulldown resistance RPD to GND 53 kΩ Propagation delay tPD INx to OUTx change 0.7 μs Time to sleep tsleep Inputs low to sleep 1 ms 1.6 V V 0.5 –1 V 1 μA MOTOR DRIVER OUTPUTS (OUT1, OUT2) High-side FET on resistance RDS(ON)_High VM = 24 V, IOUT = 1A, 430 mΩ Low-side FET on resistance RDS(ON)_Low VM = 24 V, IOUT = 1A, 480 mΩ Output dead time tDEAD 220 ns Body diode forward voltage Vd IOUT = 1A 0.9 V ISEN gain AV VREF = 2.5V 10 V/V PWM off-time tOFF 25 µs PWM blanking time tBLANK 2 µs 6.2 V 6.5 V 240 mV CURRENT REGULATION PROTECTION CIRCUITS VUVLO_fall VM undervoltage lockout VM rises until operation recovers VM undervoltage hysteresis VUV_HYS Overcurrent protection trip level IOCP 4.5 A Overcurrent deglitch time tOCP 1.8 μs Overcurrent retry time tRETRY 3 ms www.toll-semi.comwww.suntosemi.com 4 VUVLO_rise VM falls until UVLO triggers Rising to falling threshold TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 TMI8870 TMI8870B ELECTRICAL CHARACTERISTICS (Continued) PARAMETER SYMBOL Thermal shutdown threshold TEST CONDITIONS MIN TYP MAX UNIT TSD 150 °C THYS 30 °C (Note 4) Thermal shutdown hysteresis (Note 4) Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + PD x θJA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ(MAX)-TA)/θJA. Note 3: tON applies when the device initially powers up, and when it exits sleep mode. Note 4: Thermal shutdown threshold and hysteresis are guaranteed by design. OPERATION Overview The TMI8870/B devices are optimized 8-pin devices for driving brushed DC motors with 6.8V to 45 V and up to 3.6-A peak current. The integrated current regulation restricts motor current to a predefined maximum. Two logic inputs control the H-bridge driver, which consists of four N-channel MOSFETs that have a typical RDS(ON) of 0.9Ω (including one high-side and one low-side FET). A single-power input, VM, serves as both device power and the motor winding bias voltage. The integrated charge pump of the device boosts VM internally and fully enhances the high-side FETs. Motor speed can be controlled with pulse-width modulation, at frequencies between 0 to 100kHz. The devices have an integrated sleep mode that is entered by bringing both inputs low. An assortment of protection features prevents the device from being damaged if a system fault occurs. Bridge Control The TMI8870/B output consists of four N-channel MOSFETs that are designed to drive high current. These outputs are controlled by the two logic inputs IN1 and IN2 as listed in Table 1. Table 1. H-Bridge Control IN1 IN2 OUT1 OUT2 DESCRIPTION 0 0 High-Z High-Z Coast; H-bridge disabled to High-Z (sleep entered after 1ms) 0 1 L H Reverse (Current OUT2 →OUT1) 1 0 H L Forward (Current OUT1 →OUT2) 1 1 L L Brake; low-side slow decay The inputs can be set to static voltages for 100% duty cycle drive, or they can be pulse-width modulated (PWM) for variable motor speed. When using PWM, switching between driving and braking typically works best. For example, to drive a motor forward with 50% of the maximum RPM, IN1 = 1 and IN2 = 0 during the driving period, and IN1 = 1 and IN2 = 1 during the other period. Alternatively, the coast mode (IN1 = 0, IN2 = 0) for fast current decay is also available. The input pins can be powered before VM is applied. TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 www.toll-semi.comwww.suntosemi.com 5 TMI8870 TMI8870B Sleep Mode When the IN1 and IN2 pins are both low for time tSLEEP (typically 1 ms), the TMI8870/B device enters a lowpower sleep mode, where the outputs remain High-Z and the device uses IVMSLEEP (µA) of current. If the device is powered up while both inputs are low, it immediately enters sleep mode. After the IN1 or IN2 pins are high for at least 5 µs, the device is operational 30 µs (tON) later. Current Regulation In TMI8870/B, motor peak current can be limited by the analog reference input VREF and the resistance of external sense resistor on the ISEN pin according to the below equation: ITRIP (A)= VREF (V) VREF (V) = AV × RISEN (Ω) 10 × RISEN (Ω) VM Undervoltage Lockout (UVLO) If at any time the voltage on the VM pin falls below the undervoltage-lockout threshold voltage, all FETs in the H-bridge will be disabled. Operation resumes when VM rises above the UVLO threshold. Overcurrent Protection (OCP) If the output current exceeds the OCP threshold, IOCP, for longer than tOCP, all FETs in the H-bridge are disabled. As to TMI8870, after a duration of tRETRY, the H-bridge is re-enabled according to the state of the INx pins. If the overcurrent fault is still present, the cycle repeats; otherwise normal device operation resumes. As to TMI8870B, after OCP events, the device is latched and it can only be reset by putting the device into sleep mode or by restarting the power of VM. Thermal Shutdown (TSD) If the die temperature exceeds safe limits, all FETs in the H-bridge are disabled. After the die temperature has fallen to a safe level, operation automatically resumes. Device Functional Modes The TMI8870/B devices can be used in multiple ways to drive a brushed DC motor. PWM With Current Regulation This scheme uses all of the capabilities of the device. The ITRIP current is set above the normal operating current, and high enough to achieve an adequate spin-up time, but low enough to constrain current to a desired level. Motor speed is controlled by the duty cycle of one of the inputs, while the other input is static. Brake or slow decay is typically used during the off-time. www.toll-semi.comwww.suntosemi.com 6 TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 TMI8870 TMI8870B PWM Without Current Regulation If current regulation is not required, the ISEN pin should be directly connected to the PCB ground plane. The VREF voltage must still be 0.3V to 5 V, and larger voltages provide greater noise margin. This mode provides the highest-possible peak current which is up to 3.6 A for a few hundred milliseconds (depending on PCB characteristics and the ambient temperature). If current exceeds 3.6 A, the device might reach overcurrent protection (OCP) or overtemperature shutdown (TSD). If that happens, the device disables and protects itself for about 3ms (tRETRY) and then resumes normal operation. Static Inputs with Current Regulation The IN1 and IN2 pins can be set high and low for 100% duty cycle drive, and ITRIP can be used to control the current of the motor, speed, and torque capability. VM Control In some systems, varying VM as a means of changing motor speed is desirable. In application, local bulk capacitance is needed on VM to GND to stable VM voltage during the operation with motor starts up or stops. At least a 47μF bulk capacitor with voltage rating of operation voltage is recommended. However, the system-level testing is required to determine the appropriate size bulk capacitors. APPLICATION INFORMATION Application information The TMI8870/B devices are typically used to drive one brushed DC motor as below: Controller GND OUT2 IN2 TMI8870 ISEN TMI8870B OUT1 IN1 3.3V VREF 0.2Ω VM: 6.5V-45V VM 0.1μF TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 BDC 47μF www.toll-semi.comwww.suntosemi.com 7 TMI8870 TMI8870B Block Diagram VM VM VM Internal Power GND OCP1 OUT1 Gate Driver IN1 Logic Control IN2 VM UVLO OUT2 Gate Driver OCP2 ISEN OTP + - AV VREF Figure 2. TMI8870/B Block Diagram www.toll-semi.comwww.suntosemi.com 8 TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 TMI8870 TMI8870B PACKAGE INFORMATION ESOP8 Unit: mm Symbol Dimensions In Millimeters Min Max A 4.70 5.10 B 3.70 L 6.00 E Dimensions In Millimeters Symbol Min Max C 1.35 1.75 4.10 a 0.35 0.49 6.40 R 0.30 0.60 P 0° 7° 1.27 BSC K 0.02 0.10 b 0.40 1.25 A1 3.1 3.5 B1 2.2 2.6 Note: 1) All dimensions are in millimeters. 2) Package length does not include mold flash, protrusion or gate burr. 3) Package width does not include inter lead flash or protrusion. 4) Lead popularity (bottom of leads after forming) shall be 0.10 millimeters max. 5) Pin 1 is lower left pin when reading top mark from left to right. TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06 www.toll-semi.comwww.suntosemi.com 9 TMI8870 TMI8870B TAPE AND REEL INFORMATION TAPE DIMENSIONS: ESOP8 REEL DIMENSIONS: ESOP8 Unit: mm A B C D E F T1 Ø 330±1 12.7±0.5 16.5±0.3 Ø 99.5±0.5 Ø 13.6±0.2 2.8±0.2 1.9±0.2 Note: 1) All Dimensions are in Millimeter 2) Quantity of Units per Reel is 3000 3) MSL level is level 3. www.toll-semi.comwww.suntosemi.com 10 TMI and SUNTO are the brands of TOLL microelectronic TMI8870_TMI8870B V1.0 2019. 06