Ordering number : ENA0845A LV8800V Bi-CMOS IC For Notebook PC http://onsemi.com Fan Motor Driver Overview The LV8800V is a motor driver for notebook PC fans. Feature • Direct PWM sensorless motor driver Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Power supply voltage Predrive voltage (gate voltage) Output pin current Symbol Conditions Ratings Unit VCC max 6.5 VG max 10 V V IOUT max 0.7 A PWM input pin withstand voltage VPWM max VCC V FG output pin withstand voltage VFG max 6.0 V FG output current IFG max 5.0 mA Power dissipation 1 Pd max1 Independent IC 0.3 W Power dissipation 2 Pd max2 Mounted on specified board *1 0.8 W -30 to +95 °C -55 to +150 °C Operating temperature Topr Storage temperature Tstg *2 *1 : When mounted on 76.1mm×114.3mm×1.6mm glass epoxy board *2 : Tj max = 150°C. Use the IC in the range where the temperature of the chip does not exceed Tj = 150°C during operation. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Recommended Operating Conditions at Ta = 25°C Parameter Power supply voltage Symbol VCC Semiconductor Components Industries, LLC, 2013 May, 2013 Conditions Ratings 2.2 to 6.0 Unit V 82907 MS 20070726-S00002 / 62007 MS PC 20070529-S00004 No.A0845-1/7 LV8800V Electrical Characteristics Ta = 25°C, VCC = 5V, unless specifically noted Parameter Symbol Ratings Conditions min typ Unit max Power supply current 1 ICC1 PWM pin = VCC 1.8 2.5 mA Power supply current 2 ICC2 PWM pin = 0V 20 50 μA Charge pump output Output voltage VG 9.8 V Output block Source Sink Source + sink Ron (H) IO = 0.5A, VG = 9.5V 0.6 1.0 Ω Ron (L) IO = 0.5A, VCC = 5.0V 0.6 1.0 Ω IO = 0.5A, VCC = 5V, VG = 9.5V 1.2 2 Ω Ron (H+L) Startup oscillation pin OSC pin charge current IOSC1 -2.5 μA OSC pin discharge current IOSC2 2.5 μA PWM input pin PWM pin high-level input voltage VPWMH VCC×0.8 VCC V PWM pin low-level input voltage VPWML 0 VCC×0.2 V -50 μA 25 50 kHz 0.1 0.2 V 0.25 0.275 V 1.0 s PWM pin input current IPWM PWM input frequency fPWM PWM pin = 0V 20 FG output pin FG output pin low-level voltage VFG When IO = 0.5mA VRf RF = 0.5Ω Current limiter circuit Limiter voltage 0.225 Constraint protection circuit Constraint protection detection time RDT1 0.5 Constraint protection release time RDT2 5 s 180 °C 30 °C Thermal protection circuit Thermal protection circuit operating TSD Design target * ΔTSD Design target * 150 temperature Temperature hysteresis width * : Design target value and no measurement is made. The thermal protection circuit is incorporated to protect the IC from burnout or thermal destruction. Since it operates outside the IC's guaranteed operating range, the customer's thermal design should be performed so that the thermal protection circuit will not be activated when the fan is running under normal operating conditions. Package Dimensions unit : mm (typ) 3178B 5.2 0.5 6.4 9 4.4 16 1 8 0.65 0.15 1.5max 0.22 0.1 (1.3) (0.33) Allowable power dissipation, Pd max – W 1.0 Pd max – Ta Specified circuit board : 76.1×114.3×1.6mm3 glass epoxy board 0.8 0.6 0.4 0.35 0.2 0 – 30 – 20 0 20 25 40 60 80 95 100 Ambient temperature, Ta – °C SANYO : SSOP16(225mil) No.A0845-2/7 LV8800V Pin Assignment 1 16 WO UO 2 15 RF VCC 3 14 CPC COM 4 COMIN 5 FIL 6 11 PWM OSC 7 10 FG SGND 8 9 LV8800V VO 13 CP 12 VG F/R Top view Block Diagram VG VCC WO VO TSD UO VREF RF SGND CURRENT LIMITTER COM PRE DRIVE SELECTOR LOCK PROTECT LOGIC COMIN SENSORLESS LOGIC FIL OSC FG PWM OSC FR VG CP CPC CHARGE PUMP MOSC 1/N No.A0845-3/7 LV8800V Pin Functions Pin No. Pin name 3 VCC Function Equivalent circuit Power supply for the IC and motor. A capacitor must 3 be connected between this pin and ground. 2 UO 1 VO 16 WO 15 RF Output pins. Connect the motor coil. 2 50kΩ 1 50kΩ 16 50kΩ Output current detection. The drive current is 15 detected by connecting a resistor between this pin and ground. COMIN VG Motor position detection comparator filter pin. A UO VO WO capacitor must be connected between this pin and the FIL pin (pin 6). 6 FIL Motor position detection comparator filter pin. A 50kΩ 5 Motor middle point connection. 50kΩ COM 50kΩ 4 4 1kΩ 6kΩ 6kΩ 1kΩ capacitor must be connected between this pin and the COMIN pin (pin 5). 7 OSC 5 Motor startup frequency setting. A capacitor must VCC be connected between this pin and ground. The 6 VCC startup frequency is adjusted by controlling the charge/discharge current (±2.5μA) and the 500Ω capacitance of the capacitor. 7 8 SGND 9 F/R 500Ω Ground for IC. Motor rotation direction switching. A high-level input causes current to flow into the motor in the order of VCC Reverse signal U, V, and W and a low-level input in the order of U, W, and V. Changing the order of current application turns the motor in the opposite direction. Forward/reverse switching signal 9 100kΩ Forward signal 10 FG FG pulse output. This pin outputs a Hall sensor 10 system equivalent pulse signal. 11 PWM PWM signal input. A high-level input turns on the output transistors. A low-level input turns off the VCC output transistors and motor stops. The motor speed is set by controlling the duty cycle of the input 300kΩ PWM signal. The motor runs at full speed when this pin is held open. 11 15kΩ Continued on next page. No.A0845-4/7 LV8800V Continued from preceding page. Pin No. Pin name 12 VG Function Equivalent circuit Charge pump step-up output. A capacitor must be 13 connected between this pin and ground. VCC 13 CP 14 12 Charge pump step-up pulse output pin. A capacitor must be connected between this pin and the CPC pin (pin 14). 14 CPC Charge pump step-up pin. A capacitor must be connected between this pin and the CP pin (pin 13). LV8800V Functional Description and Notes on External Components Read the following notes before designing driver circuits using the LV8800V to design a system with fully satisfactory characteristics. 1. Output drive circuit and speed control methods The LV8800V adopts the synchronous commutation PWM drive method to minimize power loss in the output circuits. Low on-resistance DMOS devices (total high and low side on-resistance of output block : 1.2Ω, typical) are used as the output transistors. The speed control of the driver is performed with an externally input PWM signal. PWM controls the speed by performing switching in accordance with the duty cycle that is input to the PWM pin (11-pin). The output transistor is on when a high-level voltage is input to the PWM pin, and off when a low-level voltage is input. When the motor is used with the PWM pin open, the built-in resistor causes the PWM pin to change to high-level voltage and the motor speed rises to full speed. When the PWM pin is fixed at low-level voltage, the motor decelerates, and after the motor stops it enters “Power Saving Mode. 2. Soft Switching Circuit This IC adopts variable duty soft switching to minimize the motor drive noise. 3. Current limiter circuit The current limiter circuit limits the output current peak value to a level determined by the equation I = VRF/RF (VRF = 0.25V typical). The current limiter circuit detects the peak current of the output transistors at the RF pin (pin 15) and turns off the transistor of the PWM phase. 4. OSC circuit The OSC pin (pin 7) is an oscillation pin provided for sensorless motor startup commutation. When a capacitor is connected between the OSC pin and ground, the OSC pin starts self-oscillation, and this becomes the startup frequency. The oscillator frequency can be adjusted by changing the value of the external capacitor (i.e. reducing the value of the capacitor increases the startup frequency). It is necessary to select a value of the capacitor that provides the optimal startup characteristics. 5. Position Detector Comparator Circuit for Rotor The position detection comparator circuit for the rotor is a comparator for detecting rotor positional information with the back EMF signal generated when the motor rotates. The IC determines the timing at which the output block applies current to the motor based on the position information obtained here. Insert a capacitor (between 1,000 and 10,000pF) between the COMIN pin (pin 5) and FIL (pin 6) to prevent any motor startup missoperation that is caused by the comparator input noise. 6. FG Output Circuit The FG pin (pin 10) is the FG output pin. It provides a pulse signal equivalent to that provided by systems that use a Hall-effect sensor. No.A0845-5/7 LV8800V Since the FG pin has an open drain output structure, it must be used with a pull-up resistor. Connect a pull-up resistor on the side of the power supply where the FG signal is input. A pull-up resistor with a resistance of about 10kΩ is recommended. No.A0845-6/7 LV8800V 7. Charge Pump Circuit The LV8800V n-channel DMOS output structure allows it to provide a charge pump based voltage step-up circuit. A voltage 2 times the VCC voltage can be acquired by inserting capacitors (recommended value : 0.1μF or larger) between the CP pin (pin 13) and CPC pin (pin 14). Note that this circuit is designed so that the stepped-up voltage (VG) is clamped at about 9.5VDC. A larger capacitor must be used between the VG pin (pin 12) and ground if the ripple on the stepped-up voltage (VG) results in VG exceeding 10V(VG max). Observe the following points if the VG voltage is supplied from external circuits. (1) The VG voltage supplied from the external circuits must not exceed the absolute maximum rating VG max. (2) The capacitors between the CP pin (pin 13) and CPC pin (pin 14) are not required. (3) Observe the correct sequence when turning the power supply on. Apply the VG voltage after first turning the VCC voltage on, and cancel the VG voltage application before turning the VCC off. (4) There is an IC-internal diode between the VCC and VG pins. Therefore, supply voltages such that VCC > VG must never be applied to this IC. 8. Notes on PCB Pattern Design The LV8800V is a system driver IC implemented using the Bi-CMOS process; the IC chip includes bipolar circuits, MOS logic circuits, and MOS drive circuits. As a result, extreme care is required with respect to the pattern layout when designing application circuits. (1) Ground and VCC wiring layout Insert a capacitor (recommended value : 1μF or larger) as near as possible to the pin between the power pin (pin 3) and ground pin (pin 8). (2) Positioning the external components The external components that are connected to ground must be connected with lines that are as short as possible. External components connected between IC pins must be placed as near to the pins as possible. Application Circuit Example 1 VO WO 16 2 UO RF 15 0.5Ω VCC 3 VCC CPC 14 0.1μF 1μF 4 COM CP 13 5 COMIN VG 12 0.1μF 1000pF 6 FIL PWM 11 7 OSC FG 10 8 SGND F/R PWM PWM Control Signal f = 20k to 50kHz 2200pF 9 No.A0845-7/7 LV8800V ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. 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