LV8805V
Bi-CMOS LSI
Fan Motor Driver
for PC and Server
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Overview
The LV8805V is a motor driver for PC and server fans.
Feature
Direct PWM three-phase sensorless motor driver
Typical Applications
Computer peripherals
Fan motor Unit
Server
SSOP36J (275mil)
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
VCC maximum supply voltage
VCC max
16
V
VG maximum supply voltage
VG max
21
V
OUT pin withstand voltage
VOUT max
16
V
OUT pin maximum output
IOUT max
1.2
A
SOFTST pin withstand voltage
VSOFTST max
6
V
FR pin withstand voltage
VFR max
6
V
PWMIN pin withstand voltage
VPWMIN max
6
V
FG output pin withstand voltage
VFG max
16
V
FG pin output current
IFG max
5
mA
1/2FG output pin withstand
V1/2FG max
16
V
1/2FG pin output current
I1/2FG max
5
mA
RD output pin withstand voltage
VRD max
16
V
RD pin output current
IRD max
5
mA
Allowable Power dissipation 1
Pd max1
Independent IC
0.6
W
Allowable Power dissipation 2
Pd max2
Mounted on designated board *1
Operating temperature
Topr
Storage temperature
Tstg
*2
1.3
W
40 to +95
C
55 to +150
C
*1: When mounted on the designated 76.1mm × 114.3mm × 1.6mm, glass epoxy board (single-layer)
*2: Do not exceed Tjmax=150C.
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
ORDERING INFORMATION
See detailed ordering and shipping information on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
April 2015 - Rev. 2
1
Publication Order Number :
LV8805V/D
LV8805V
Recommended Operating Conditions at Ta = 25C
Parameter
Symbol
VCC supply voltage
VCC
SOFTST input voltage range
Conditions
Ratings
Unit
6 to 15
V
VSOFTST
0 to VREG
V
FR input voltage range
VFR
0 to VREG
V
MINSP input voltage range
VMINSP
0 to VREG
V
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
Electrical Characteristics at Ta 25C, VCC = 12V, unless otherwise specified
Parameter
Circuit current 1
Symbol
Conditions
Ratings
min
typ
Unit
max
ICC1
2.6
VVG
17
3.6
mA
Charge pump block
Charge pump output voltage
V
Regulator block
5V regulator voltage
VVREG
4.75
5
5.25
V
1.2
2
Output on resistance
Sum of high-/low-side output transistor on
Ron (H+L)
IO = 0.7A, VCC = 12V, VG = 17V
resistance
Startup oscillator (OSC) pin
OSC pin charge current
IOSCC
2.5
A
OSC pin discharge current
IOSCD
2.5
A
PWM input (PWMIN) pin
High-level input voltage range
VPWMINH
2.5
VREG
V
Low-level input voltage range
VPWMINL
0
1
V
Range of PWM input frequency
fPWMIN
Minimum pulse width
TMINPW
15
60
kHz
0.2
s
2.5
VREG
V
0
1
V
Input HIGH voltage 5[V] and
input LOW voltage 0[V]
Duty cycle range is determined by
(TMINPW x fPWMIN) x 100% for minimum
(1 − TMINPW x fPWMIN) x 100% for maximum
When fPWMIN = 60[kHz], the input PWM duty cycle range = 1.2% - 98.8%
When fPWMIN = 50[kHz], the input PWM duty cycle range = 1.0% - 99.0%
When fPWMIN = 25[kHz], the input PWM duty cycle range = 0.5% - 99.5%
When fPWMIN = 15[kHz], the input PWM duty cycle range = 0.3% - 99.7%
Forward/reverse switching pin
High-level input voltage range
VFRH
Low-level input voltage range
VFRL
Order of current application :
UOUTVOUTWOUT
Order of current application :
UOUTWOUTVOUT
FG, 1/2FG, and RD output pins
FG output pin low-level voltage
VFG
When IO is 2mA
FG output pin leak voltage
ILFG
When VFG is 16V
1/2FG output pin low-level voltage
V1/2FG
When IO is 2mA
1/2FG output pin leak voltage
IL1/2FG
When V1/2FG is 16V
RD output pin low-level voltage
VRD
When IO is 2mA
RD output pin leak voltage
ILRD
When VRD is 16V
VRF
Limit current set to 1A when RF is 0.25.
0.25
0.35
V
1
A
0.25
0.35
V
1
A
0.25
0.35
V
1
A
V
Current limiter circuit
Limiter voltage
0.225
0.25
0.275
Constraint protection circuit
CT pin high-level voltage
VCTH
2.25
2.8
2.95
V
CT pin low-level voltage
VCTL
0.43
0.5
0.65
V
CT pin charge current
ICTC
2.9
2.5
2.2
A
CT pin discharge current
ICTD
0.21
0.25
0.32
A
ICT charge/discharge ratio
RCT
7
10
13
Continued on next page.
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LV8805V
Continued from preceding page.
Parameter
Symbol
Conditions
Ratings
min
typ
max
Unit
Soft start circuit
Soft start releasing voltage
VSOFTST
2.5
V
SOFTST pin charge current
ISOFTST
0.6
A
Thermal protection circuit
Thermal protection circuit operating
TSD
Design target *
150
180
210
C
temperature
* : 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.
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be
indicated by the Electrical Characteristics if operated under different conditions.
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LV8805V
Package Dimensions
unit : mm
SSOP36J (275mil) Exposed Pad
CASE 940AH
ISSUE A
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4
LV8805V
1.00
SOLDERING FOOTPRINT*
(Unit: mm)
7.00
(3.5)
(4.0)
0.80
0.42
NOTES:
1. The measurements are for reference only, and unable to guarantee.
2. Please take appropriate action to design the actual Exposed Die Pad and Fin portion.
3. After setting, verification on the product must be done.
(Although there are no recommended design for Exposed Die Pad and Fin portion Metal mask and shape
for Through−Hole pitch (Pitch & Via etc), checking the soldered joint condition and reliability verification of
soldered joint will be needed. Void gradient insufficient thickness of soldered joint or bond degradation
could lead IC destruction because thermal conduction to substrate becomes poor.)
*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor
Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
GENERIC
MARKING DIAGRAM*
XXXXXXXXXX
YMDDD
XXXXX = Specific Device Code
Y = Year
M = Month
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5
LV8805V
Allowable power dissipation, Pd max – W
1.5
Pd max – Ta
Thermal resistance
evaluation board
Thermal resistance
evaluation board :
76.1 × 114.3 × 1.6mm3
glass epoxy
1.30
1.0
Independent IC
0.60
0.57
0.5
0.26
0
– 30 – 20
0
20
40
60
80
100
120
Ambient temperature, Ta – °C
Pin Assignment
COMIN 1
36 COM
FIL 2
35 VCC
VREG 3
34 VCC
VREG 4
33 VCC
NC 5
32 VCC
NC 6
31 NC
F/R 7
30 UO
PWMIN 8
29 VO
NC 9
SOFTST 10
28 WO
LV8805V
27 RF
FG 11
26 RF
1/2FG 12
25 NC
NC 13
24 RF
RD 14
23 SUB_GND
NC 15
22 CPC
CT 16
21 CP
OSC 17
20 VG
GND 18
19 GND
Top view
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LV8805V
Block Diagram
1/2FG
FG
RD
FG
CT
RD
CTOSC
VG
CPC
CP
CHARGE
PUMP
VREG
REFOSC
VREG
PWMIN
OSC
SENSORLESS
LOGIC
F/R
START
OSC
PRI DRIVE
FIL
VCC
COMIN
UO
VO
WO
SELECTOR
COM
RF
CURR LIM
SUB_GND
GND
SOFTST
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COM
LV8805V
Pin Function
Pin No.
36
1
Pin name
COM
COMIN
Function
Equivalent circuit
Motor middle point connection.
VG
Motor position detection comparator filter
pin. A capacitor must be connected between
this pin and the FIL pin (pin 2).
2
FIL
36
Motor position detection comparator filter
pin. A capacitor must be connected between
this pin and the COMIN pin (pin 5).
1
3
VREG
Regulator voltage (5V) output.
2
VCC
A capacitor must be connected between
these pins and ground.
4
3
4
VREF
5, 6, 9
NC
No connection. These pins are not
connected with the internal parts.
13, 15,
25, 31
7
F/R
Motor rotation direction switching. A
high-level input causes current to flow into
VREG
Reverse signal
the motor in the order of U, V, and W and a
low-level input in the order of U, W, and V.
Changing the order of current application
7
turns the motor in the opposite direction.
15kΩ
Forward/reverse
switching signal
100kΩ
Forward signal
8
PWMIN
PWM signal input pin.
VREG
"H" The output transistor is turned on by the
level voltage input. "L" The output transistor
is turned off by the level voltage input, and
the motor stops. The speed of the motor is
controlled by controlling Duty of the input
8
signal. When the pin opens, the motor
becomes all velocities.
10
SOFTST
Soft start time setting.
VREG
The motor can be started smoothly by
connecting a capacitor between this pin and
ground.
500Ω
10
Continued on next page.
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8
LV8805V
Continued from preceding page.
Pin No.
Pin name
11
FG
12
1/2FG
14
RD
16
CT
Function
Equivalent circuit
FG pulse output. This pin outputs a Hall
11 12 14
sensor system equivalent pulse signal.
FG pulse output. This pin outputs 1/2 Hall
sensor system equivalent pulse signal.
Motor lockup detection output.
Output is fixed high when motor is locked up.
Motor lockup detection time setting.
VREG
When the motor lockup condition is detected,
the protection time period before the
protection circuit is activated is set by
connecting a capacitor between this pin and
ground.
500Ω
16
17
OSC
Motor startup frequency setting. A capacitor
VREG
must be connected between this pin and
ground. The startup frequency is adjusted by
controlling the charge/discharge current and
500Ω
capacitance of the capacitor.
17
18, 19
20
GND
VG
500Ω
GND pin.
Charge pump step-up voltage output.
21
A capacitor must be connected between this
21
CP
22
VCC
pin and the VCC pin or ground.
VREG
Charge pump step-up pulse output pin.
20
A capacitor must be connected between this
pin and the CPC pin (pin 22).
22
CPC
Charge pump step-up pin.
A capacitor must be connected between this
pin and the CP pin (pin 21).
23
32, 33,
SUB_GND
VCC
34, 35
30
UO
29
VO
28
WO
24, 26,
RF
27
GND pin.
Power supply for the IC and motor.
Capacitors must be connected between
32 33
these pins and ground.
34 35
Output pins. Connect these pins to the U, V,
28
and W of the motor coil.
29
30
24
26 27
Output current detection pins. The drive
current is detected by connecting a resistor
between these pins and ground.
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LV8805V
Application Circuit Example
*3
VCC
UO
VG
VO
CP
WO
COM
CPC
COMIN
VREG
*10
F/R
FG
PWMIN
PWM Control Signal
F=20kHz to 50kHz
*11
RFG, R1/2FG, RRD
=10k to 100k
FIL
PWMIN
1/2FG
RD
*11
*11
*11
FG
1/2FG
RD
CT
RF
SOFTST
OSC
*8
1000pF
GND SUB
GND
*1
*1. Power supply and GND wiring
The GND is connected to the control circuit power supply system.
*2. Power-side power stabilization capacitor
For the power-side power stabilization capacitor, use a capacitor of 10F or more.
Connect the capacitor between VCC and GND with a thick and along the shortest possible route.
The VCC pins (pins 32, 33, 34, and 35) must be short-circuited on the print pattern.
The GND pins (pins 18 and 19) and the SUB_GND pin (pin 23) must be short-circuited on the print pattern.
LV8805V uses synchronous rectification for high efficiency drive. Synchronous rectification is effective for heat
reduction and higher efficiency. However, it may increase supply voltage.
If the supply voltage shall increase, make sure that it does not exceed the maximum ratings by inserting a zener diode
between power supply and GND.
*3. Reverse connection protection diode
This diode protects reverse connection.
Insert a diode between power supply and VCC pin to protect the IC from destruction due to reverse connection.
Connection of this diode is not necessary required.
*4. COMIN and FIL pins
These pins are used to connect the filter capacitor. The LV8805V uses the back EMF signal generated when the motor
is running to detect the information on the rotor position. The IC determines the timing at which the output block
applies current to the motor based on the position information obtained here. Insert a filter capacitor with a capacitance
ranging from 1,000pF to 10,000pF (reference value) between the COMIN pin and FIL pin to prevent any motor startup
misoperation that is caused by noise. However, care must be taken since an excessively high capacitance will give rise
to deterioration in efficiency and delays in the output power-on timing while the motor is running at high speed.
Furthermore, connect the capacitor between the COMIN pin and FIL pin as close as possible in order to avoid the
effects of noise from other sources.
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LV8805V
*5. CT pin
This pin is used to connect the lock detection capacitor.
The constant-current charging and constant-current discharging circuits incorporated cause locking when the pin
voltage reaches 2.5V, and releasing the lock protection when it drops to 0.5V. This pin must be connected to the GND
when it is not going to be used.
*6. RF pins
These pins are used to set the current limit.
When the pin voltage exceeds 0.25V, the current is limited, and regeneration mode is established. In the application
circuit, this voltage is set in such a way that the current limit will be established at 1A.
The calculation formula is given below.
RF resistance = 0.25V/target current limit value
All the RF pins (pins 24, 26 and 27) must be short-circuited on the print pattern.
*7. SOFTST pin
This pin is used to set the soft start.
By connecting a capacitor between this pin and GND, the motor speed can be increased gradually.
When the pin voltage exceeds 2.5V, the soft start is released, and the LV8805V is switched to normal control.
If the soft start function is not going to be used, connect the pin to the VREG pin.
*8. OSC pin
This pin is used to connect the capacitor for setting the startup frequency.
A capacitor with a capacitance ranging from about 500pF to 2,200pF (reference value) must be connected between
this pin and GND.
The OSC pin determines the motor startup frequency, so be sure to connect a capacitor to it.
Select a capacitance value that will result in the shortest possible startup time for achieving the target speed and
produce minimal variations in the startup time. If the capacitance is too high, variations in the startup time will
increase; conversely, if it is too low, the motor may idle. The optimum OSC constant depends on the motor
characteristics and startup current, so be sure to recheck them when the type of motor used or circuit specifications are
changed.
*9. VG, CP, and CPC pins
These pins are used to connect the capacitors to generate the pre-drive voltage and stabilize the pre-drive power
supply.
Be sure to connect these capacitors in order to generate the drive voltage for the high-side (upper) output DMOS
transistor.
*10. VREG pins
These are the control system power supply pin and regulator output pin, which create the power supply of the control
unit. Be sure to connect a capacitor between this pin and GND in order to stabilize control system operation.
Since these pins are used to supply current for control and generate the charge pump voltage, connect a capacitor with
a capacitance that is higher than that of the capacitor connected to the charge pump.
Both the VREG pins (pins 3 and 4) must be short-circuited on the print pattern.
*11. Pin protection resistor
It is recommended that resistors higher than 1kΩ are connected serially to protect pins against misconnection such as
GND open and reverse connection.
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LV8805V
ORDERING INFORMATION
Device
LV8805V-MPB-H
Package
SSOP36J (275mil)
(Pb-Free / Halogen Free)
LV8805V-TLM-H
SSOP36J (275mil)
(Pb-Free / Halogen Free)
Shipping (Qty / Packing)
30 / Fan-Fold
2000 / Tape & Reel
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