SANYO LB11851M

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. 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.
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
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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.
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Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
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This catalog provides information as of April, 2007. Specifications and information herein are subject
to change without notice.
PS No.A0673-6/6