Ordering number : ENA0673A Monolithic Digital IC LB11851M Microprocessor Fan Motor Interface Driver Overview The LB11851M provides an interface between a microcontroller motor control signal and external MOS transistors. This device can implement a microprocessor fan driver with a minimal number of external components. The LB11851M is optimal for server and personal computer microprocessor fan drive in response to temperature or other external signals when high precision and high air flow are required. Features • Fan motor interface driver function (FGIN) ⇒ This IC accepts a signal from a microcontroller and interfaces to external power transistors (PMOS and NMOS) to provide high-efficiency low-power single-phase full-wave drive. • Variable speed input pin (PWMIN) ⇒ PMOS side PWM control NMOS side current regeneration using slow decay is used to achieve quite high-speed control. • Built-in kickback absorption circuit (OUT1P/2P) ⇒ This circuit absorbs the kickback current that is generated at phase switching or power on/off to achieve smooth current regeneration and protect the external transistors against destruction or degradation. • Built-in current limiter circuit (SENSE) ⇒ This circuit implements a chopper-type current limiting control that operates at startup and during lock protection mode. The current detection voltage is set to a fixed 0.2V internally. • Built-in microcontroller power supply (5VREG) Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. 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To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 41807 MS PC 20070417-S00001 / 22107 MS PC 20070122-S00004 No.A0673-1/6 LB11851M Specifications Allowable Operating Ranges at Ta = 25°C Parameter Maximum supply voltage Symbol Conditions Ratings Unit VCC max 18 V OUTN pin maximum output current IOUTN max 20 mA OUTP pin maximum output current IOUTP max 20 mA OUT pin voltage handling capacity VOUT max 18 V I5VREG max 20 mA 0.8 W 0.3 W -30 to +95 °C -55 to +150 °C 5VREG maximum output current Allowable power dissipation Pd max When mounted on the specified circuit board *1 Independent IC Operating temperature Topr Storage temperature Tstg *2 *1 Specified substrate : 114.3mm × 76.1mm × 1.6mm, glass epoxy board. *2 Do not exceed Tj max = 150°C Recommended Operating Ranges at Ta = 25°C Parameter Supply voltage - VCC Symbol Conditions Ratings VCC Unit 6 to 16 V PWM high-level input voltage range VPWMINH 2.1 to 5 V PWM low-level input voltage range VPWMINL 0 to 0.4 V FGIN high-level input voltage range VFGINH 2.1 to 5 V FGIN low-level input voltage range VFGINL 0 to 0.3 V SENSE input voltage range VSENop 0 to 5 V Electrical Characteristics at Ta = 25°C, VDD = 12V Parameter Symbol Ratings Conditions min Circuit current ICC1 typ Unit max With no load 3.5 5 6.5 mA 5VREG = 10mA 4.8 5 5.2 V 0.15 0.19 0.23 V 60 80 100 µA -27 -21 -15 µA 5VREG voltage 5VREG SENSE pin detection voltage VSENth FGIN high-level input current FGIhi VIN = 3V FGIN low-level input current FGIlow VIN = 0V PWMIN high-level current PWMIhi VIN = 3V 35 45 55 µA PWMIN low-level current PWMIlow VIN = 0V -27 -21 -14 µA OUT1P, OUT2P high-level output VO12PH IO = 10mA *2 10 11 11.9 V VO12PL IO = 10mA *2 3 4 5 V VO12NH IO = 10mA *1 9 10 11.9 V VO12NL IO = 10mA *1 0.1 1 2 V voltage OUT1P, OUT2P low-level output voltage OUT1N, OUT2N high-level output voltage OUT1N, OUT2N low-level output voltage *1 : There is a built-in 100Ω gate protection resistor. *2 : There is a built-in 300Ω gate protection resistor. No.A0673-2/6 LB11851M Truth Table FGIN PWMIN SENSE OUT1P OUT1N OUT2P OUT2N L L L L L H H OUT1 → 2 drive H H L L OUT2 → 1 drive H L H H Regeneration mode H H H L (low side regeneration) H L H H Current limiter H H H L (low side regeneration) H L H L H L L H H Mode Note 1 : For the SENSE pin, the "H" state is 0.2V or higher. Note 2 : The IC goes to regeneration mode (no motor drive applied) when the microcontroller is reset (the output high-impedance state). Package Dimensions unit : mm (typ) 3086B Pd max -- Ta 0.63 5.0 10 4.4 6.4 6 0.15 0.1 (1.5) 1.7max 5 1 Allowable power dissipation, Pd max -- W 1.0 0.35 1.0 0.8 Specified circuit board : 114.3×76.1×1.6mm3 glass epoxy board When mounted on the thermal resistance evaluation board 0.6 0.4 0.2 0.13 0 -30 (0.5) 0.35 Independent IC 0.3 0 30 60 90 120 Ambient temperature, Ta -- °C SANYO : MFP10S(225mil) Pin Assignment OUT2P 1 10 OUT1P OUT2N 2 9 OUT1N 5VREG 3 8 VCC FGIN 4 7 SENSE PWMIN 5 6 GND LB11851M Top View No.A0673-3/6 LB11851M 1. Power supply (VCC and VM) and ground The wiring is separated into the control IC side (VCC line) and the motor output side (VM line) by the diode DI, which protects the IC from destruction on reverse connection. The application circuit uses 1µF capacitors to prevent line oscillation when kickback occurs. Similarly, 1µF capacitors are also used on the VCC line for power supply line stabilization. 2. PWMIN The LB11851M accepts an open-drain output signal from the microcontroller with this pin and controls the on/off states of the PMOS transistor (OUT1P and OUT2P) outputs accordingly. A constant-current bias is provided from 5VREG internally to the IC. 3. FGIN The LB11851M accepts a CMOS output from the microcontroller with this pin and determines the drive phase output (OUT1P, OUT2P, OUT1N, or OUT2N). 4. 5VREG This is the power supply for the microcontroller, Hall effect sensors, and other circuits. A capacitor with a value of 1µF is used for output stabilization. This pin has an output current capacity of 20mA. 5. SENSE A sensing resistor is used for current detection. If the SENSE pin voltage exceeds 0.2V, the PMOS transistors are turned off and only low side regeneration is performed. Block Diagram VCC OUT1N 5VREG 20kΩ 5VREG 100Ω 300Ω 5VREG OUT1P 20kΩ Controller PWMIN 5VREG OUT2N FGIN 20kΩ 100Ω OUT2P 300Ω 20kΩ SENSE GND No.A0673-4/6 LB11851M Application Circuit Example (12V) VM=Line C=1µF R1=1kΩ C=1µF 1P 2P 1N 2N RF VCC C=1µF 5VREG SENSE PWMIN PWMOUT H ININ+ FGIN FGOUT Microcontroller LB11851M VDD PWMIN INPUT OUT2P 2P OUT2N 2N OUT1P 1P OUT1N 1N A/D GND VSS FG No.A0673-5/6 LB11851M SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of April, 2007. Specifications and information herein are subject to change without notice. PS No.A0673-6/6