LB11851TT-TLM-H

Ordering number : ENA1634 Monolithic Digital IC LB11851TT Microprocessor Fan Motor Interface Driver Overview The LB11851TT 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 LB11851TT 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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D2409 SY 20091221-S00006 No.A1634-1/5 LB11851TT Specifications Allowable Operating Ranges at Ta = 25°C Parameter Symbol Maximum supply voltage 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 400 mW 5VREG maximum output current Allowable power dissipation Pd max When mounted on the specified circuit board *1 Operating temperature Topr Storage temperature Tstg *2 -40 to +90 °C -55 to +150 °C *1 Specified substrate :20.0mm ×10.0mm ×0.8mm, Paper phenol board. *2 Do not exceed Tj max = 150°C Recommended Operating Ranges at Ta = 25°C Parameter Symbol Supply voltage - VCC Conditions Ratings VCC Unit 6 to 16 V 2.1 to 5.0 V 0 to 0.4 V PWM high-level input voltage range VPWMINH PWM low-level input voltage range VPWMINL FGIN high-level input voltage range VFGINH 2.1 to 5.0 V FGIN low-level input voltage range VFGINL 0 to 0.3 V SENSE input voltage range VSENop 0 to 5.0 V Electrical Characteristics at Ta = 25°C, VDD = 12V Parameter Symbol Ratings Conditions min Circuit current ICC1 5VREG voltage 5VREG SENSE pin detection voltage VSENth typ Unit max With no load 3.5 5 6.5 5VREG = 10mA 4.8 5 5.2 mA V 0.15 0.19 0.23 V FGIN high-level input current FGIhi VIN = 3V 60 80 100 μA FGIN low-level input current FGIlow VIN = 0V -27 -21 -15 μA 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 IO = 1mA *2 11 11.3 IO = 10mA *2 3 voltage OUT1P, OUT2P low-level output VO12PL voltage IO = 1mA *2 OUT1N, OUT2N high-level output VO12NH voltage OUT1N, OUT2N low-level output VO12NL voltage IO = 10mA *1 4 5 V 1.2 1.5 V 11.9 9 10 IO = 1mA *1 10.8 11.1 IO = 10mA *1 0.1 IO = 1mA *1 *1 : There is a built-in 100Ω gate protection resistor. V V V V 1 2 V 0.7 1 V *2 : There is a built-in 300Ω gate protection resistor. Truth Table FGIN PWMIN SENSE L L L H L H L H L L H H OUT1P OUT1N OUT2P OUT2N Mode OUT1 → 2 drive L L H H 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) 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 Pin Assignment No.A1634-2/5 LB11851TT unit : mm (typ) 3297 3.0 1 10 OUT1P OUT2N 2 9 OUT1N 5VREG 3 8 VCC FGIN 4 7 SENSE PWMIN 5 6 GND 6 0.5 3.0 4.9 10 1 LB11851TT 5 0.5 Top View 0.2 0.125 1.1 max (0.85) (0.5) OUT2P Pd max -- Ta SANYO : MSOP10(150mil) Allowable power dissipotion, Pd max - W 0.08 0.5 Specified Substrate : 20.0 × 10.0 × 0.8mm3 Paper phenol 0.4 0.3 0.19 0.2 0.1 0 -40 -20 0 20 40 60 80 100 120 Ambient temperature, Ta - C 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.A1634-3/5 LB11851TT Application Circuit Example (12V) VM=Line 1P 2P 1N 2N RF VCC 5VREG SENSE PWMIN PWMOUT H ININ+ FGIN FGOUT Microcontroller LB11851TT VDD PWMIN INPUT OUT2P 2P OUT2N 2N OUT1P 1P OUT1N 1N A/D GND VSS FG No.A1634-4/5 LB11851TT 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. * Output L voltage of OUT1 and 2 sticks in GND when FET is put up outside like the example of applied circuit by internal pull-down resistor (20KΩ), and there is no what turns on FET. Output H voltage of OUT1 and 2 sticks in VCC with internal pull-up resistor (20kΩ) as the Pch side is also similar. 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 December, 2009. Specifications and information herein are subject to change without notice. PS No.A1634-5/5