Ordering number : ENA1634
Monolithic Digital IC
LB11851TT
Overview
Microprocessor Fan Motor Interface Driver
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. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. 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.
D2409 SY 20091221-S00006 No.A1634-1/5
LB11851TT
Specifications
Allowable Operating Ranges at Ta = 25°C
Parameter Maximum supply voltage OUTN pin maximum output current OUTP pin maximum output current OUT pin voltage handling capacity 5VREG maximum output current Allowable power dissipation Operating temperature Storage temperature *2 Do not exceed Tj max = 150°C Symbol VCC max IOUTN max IOUTP max VOUT max I5VREG max Pd max Topr Tstg When mounted on the specified circuit board *1 *2 -40 to +90 -55 to +150 °C °C Conditions Ratings 18 20 20 18 20 400 Unit V mA mA V mA mW
*1 Specified substrate :20.0mm ×10.0mm ×0.8mm, Paper phenol board.
Recommended Operating Ranges at Ta = 25°C
Parameter Supply voltage - VCC PWM high-level input voltage range PWM low-level input voltage range FGIN high-level input voltage range FGIN low-level input voltage range SENSE input voltage range Symbol VCC VPWMINH VPWMINL VFGINH VFGINL VSENop Conditions Ratings 6 to 16 2.1 to 5.0 0 to 0.4 2.1 to 5.0 0 to 0.3 0 to 5.0 Unit V V V V V V
Electrical Characteristics at Ta = 25°C, VDD = 12V
Parameter Circuit current 5VREG voltage SENSE pin detection voltage FGIN high-level input current FGIN low-level input current PWMIN high-level current PWMIN low-level current OUT1P, OUT2P high-level output 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. VO12NL VO12NH VO12PL Symbol ICC1 5VREG VSENth FGIhi FGIlow PWMIhi PWMIlow VO12PH VIN = 3V VIN = 0V VIN = 3V VIN = 0V IO = 10mA *2 IO = 1mA *2 IO = 10mA *2 IO = 1mA *2 IO = 10mA *1 IO = 1mA *1 IO = 10mA *1 IO = 1mA *1 *2 : There is a built-in 300Ω gate protection resistor. 9 10.8 0.1 With no load 5VREG = 10mA Conditions min 3.5 4.8 0.15 60 -27 35 -27 10 11 3 Ratings typ 5 5 0.19 80 -21 45 -21 11 11.3 4 1.2 10 11.1 1 0.7 2 1 5 1.5 11.9 max 6.5 5.2 0.23 100 -15 55 -14 11.9 mA V V μA μA μA μA V V V V V V V V Unit
Truth Table
FGIN L H L H L H L H H L PWMIN L SENSE L OUT1P L H H H H H OUT1N L H L H L H OUT2P H L H H H H OUT2N H L H L H L OUT1 → 2 drive OUT2 → 1 drive Regeneration mode (low side regeneration) Current limiter (low side regeneration) 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
Pin Assignment
No.A1634-2/5
LB11851TT
unit : mm (typ) 3297
3.0 10 6
OUT2P OUT2N 5VREG FGIN
0.5
1 2 3 4 5 Top View
10 9
OUT1P OUT1N VCC SENSE GND
LB11851TT
8 7 6
3.0 4.9
PWMIN
1 (0.5) 0.5
5 0.2 0.125
(0.85)
1.1 max
0.5
Pd max -- Ta
Specified Substrate : 20.0 × 10.0 × 0.8mm3 Paper phenol
Allowable power dissipotion, Pd max - W
0.08
0.4
SANYO : MSOP10(150mil)
0.3
0.2
0.19
0.1
0 -40
-20
0
20
40
60
80
100
120
Ambient temperature, Ta - C
Block Diagram
VCC OUT1N 5VREG 5VREG 100Ω 5VREG Controller PWMIN 5VREG OUT2N FGIN 100Ω 20kΩ 300Ω 20kΩ OUT2P 20kΩ 300Ω OUT1P 20kΩ
SENSE
GND
No.A1634-3/5
LB11851TT
Application Circuit Example (12V)
VM=Line
1P
2P
1N
2N
RF
VCC 5VREG VDD SENSE
LB11851TT
PWMOUT H ININ+ FGOUT Microcontroller
PWMIN
OUT2P OUT2N
2P 2N
FGIN
OUT1P PWMIN INPUT A/D VSS FG GND OUT1N
1P 1N
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.
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This catalog provides information as of December, 2009. Specifications and information herein are subject t o change without notice. PS No.A1634-5/5
