Datasheet
DC Brushless Fan Motor Driver
5V Single-phase Full-wave
Fan Motor Driver
BU6906NUX
●General
Description
The BU6906NUX is a 5V single-phase full-wave FAN
motor driver with built in HALL element. This is a DC
brushless FAN motor driver series.
That has compact package, auto gain control function
(Henceforth, abbreviated to AGC), silent drive by soft
switching, and low battery consumption by standby
function.
This is the best lineup for note PC cooling FANs.
●Features
Built in HALL element.
Auto Gain Control function (AGC).
Soft switching drive (PWM type)
Low PWM duty start up
Quick start function
Stand-by mode
Incorporating lock protection and automatic restart
circuit.
Compact package
Rotating speed pulse signal (FG) output
PWM speed control
●Package(s)
VSON008X2030
W(Typ.) x D(Typ.) x H(Max.)
2.00mm x 3.00mm x 0.60mm
VSON008X2030
●Applications
For compact 5V FAN such as notebook PC cooling FAN
●Absolute
Maximum Ratings
Parameter
Supply voltage
Power dissipation
Operating temperature
Storage temperature
Output voltage
Output current
FG signal output voltage
FG signal output current
Junction temperature
*
**
Symbol
Vcc
Pd
Topr
Tstg
Vomax
Iomax
Vfg
Ifg
Tjmax
Limit
7
410*
-40 to +85
-55 to +125
7
800**
7
10
125
Unit
V
mW
℃
℃
V
mA
V
mA
℃
Reduce by 4.1mW/℃ over 25℃. (70.0mm×70.0mm×1.6mm glass epoxy board)
This value is not to exceed Pd.
●Operating
Rating
Parameter
Operating supply voltage range
Symbol
Vcc
Limit
1.8 to 5.5
Unit
V
○Product
structure：Silicon monolithic integrated circuit
.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This
product is not designed protection against radioactive rays
1/16
TSZ02201-0H1H0B100090-1-2
31.Jul.2012 Rev.002
BU6906NUX
●Block
Diagram
Take a measure against
voltage rise due to reverse
connection of power supply
and back electromotive force.
Page 13.
Datasheet
HALL ELEMENT
Vcc
1
OFFSET
CANCEL
OSCILLATOR
CIRCUIT
UVLO
GND
8
A/D
CONVERSION
This is an open drain output.
Connect a pull-up resistor.
Page 14.
VM
2
FG
7
Speed control by PWM input is
enabled. Input frequency must
be 50kHz at the maximum.
Page 9.
PWM
3
TSD
CONTROL
LOGIC
PRE
DRIVER
H-BRIDGE
OUT1
6
OUT2
4
LOCK
PROTECTION
PWM DUTY
SIGNAL OUT
PGND
5
M
Conventional FAN motor driver IC with HALL IC needs adjusting
HALL bias resistor due to vary factor about HALL amplitude.
This IC automatically controls HALL amplitude. The result
doesn’t need adjusting HALL amplitude by built in HALL element
and unique AGC function.
Page 8.
TSD : Thermal shut down(heat rejection circuit)
UVLO :Under voltage lock outputs (low voltage protection circuit)
Figure 1. Block diagram and application circuit
●Pin
Description
P/No.
1
2
3
4
5
6
7
8
●I/O
truth table
・Supply
magnetic direction (positive)
S
Vout1
Marking
T/Name
Vcc
VM
PWM
OUT2
PGND
OUT1
FG
GND
Function
Power supply terminal 1
Power supply terminal 2
PWM signal input terminal
Motor output terminal 2
Ground terminal 2
Motor output terminal 1
FG signal output terminal
Ground terminal 1
・Output
operation
Vout2
Bhys
Brev
Bfwd
Brev
Bhys
Bfwd
N
Magnetic flux density: B
Magnetic flux density: B
Figure 2. Output operation
Supply magnetic
direction
S
N
S
N
PWM*
H(OPEN)
H(OPEN)
L
L
OUT1
L
H
L
L
OUT2
H
L
L
L
FG
H (Tr：OFF)
L (Tr：ON)
H (Tr：OFF)
H (Tr：OFF)
*When PWM terminal is input L, IC state changes stand-by mode. FG terminal is H constant in stand-by mode
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
2/16
TSZ02201-0H1H0B100090-1-2
31.Jul.2012 Rev.002
BU6906NUX
●Electrical
Characteristic(s)
(Unless otherwise specified Ta=25℃,Vcc=5V)
Limit
Parameter
Symbol
MIN TYP MAX
Circuit current 1
Icc1
-
2
4
Circuit current 2
Icc2
-
50
-
(stand-by mode)
Magnetic switch-point for
Bfwd
-
1.5
-
forward rotation
Magnetic switch-point for
Brev
-
-1.5
-
reverse rotation
Magnetic hysteresis
Bhys
-
3.0
5.0
PWM input H level
Pwmh
2.5
-
Vcc
PWM input L level
Pwml
0
-
0.7
PWM Input frequency
Pwmf
5
-
50
Output voltage
FG low voltage
FG leak current
Lock detection ON time
Lock detection OFF time
Vo
Vfgl
Ifgl
Ton
Toff
-
-
-
0.35
3.5
0.16
-
-
0.50
5.0
0.24
0.4
5
0.65
6.5
Datasheet
Unit
mA
uA
mT
mT
mT
V
V
kHz
V
V
µA
s
s
Conditions
PWM=OPEN
PWM=GND
Characteristics
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
-
-
-
Io=200mA
Upper and Lower total
Ifg=5mA
Vfg=7V
Figure 8 to 13.
Figure 14,15.
Figure 16.
Figure 17.
Figure 18.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111
・
15
・
001
3/16
TSZ02201-0H1H0B100090-1-2
31.Jul.2012 Rev.002
BU6906NUX
●Typical
Performance Curves 1
4.0
100
Datasheet
80
Circuit current : Icc1 [mA]
Circuit corrent : Icc2 [uA]
3.0
2.0
85℃
25℃
-40℃
60
40
1.0
20
85℃
25℃
-40℃
Operating Voltage Range
Operating voltage range
0.0
1
2
3
4
5
Supply voltage : Vcc [V]
6
0
1
2
3
4
5
Supply voltage : Vcc [V]
6
Figure 3. Circuit current 1
Figure 4. Circuit current 2 (Stand-by mode)
Magnetic switch-point for forward rotation : Bfwd [mT]
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
1
2
3
4
5
Supply voltage : Vcc [V]
6
Magnetic switch-point for reverse rotation : Brev [mT]
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
1
2
3
4
5
Supply voltage : Vcc [V]
6
85℃
25℃
-40℃
85℃
25℃
-40℃
Operating Voltage Range
Operating voltage range
Operating voltage range
Operating Voltage Range
Figure 5. Magnetic switch-point for forward rotation
Figure 6. Magnetic switch-point for reverse rotation
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111
・
15
・
001
4/16
TSZ02201-0H1H0B100090-1-2
31.Jul.2012 Rev.002
BU6906NUX
●Typical
Performance Curves 2
3.0
1.0
Datasheet
Magnetic hysteresis : Bhys [mT]
2.5
85℃
25℃
-40℃
Output H voltage : Voh [V]
0.8
2.0
0.6
1.5
0.4
1.0
85℃
25℃
-40℃
0.2
0.5
Operating Voltage Range
0.0
1
2
3
4
5
Supply voltage : Vcc [V]
6
0.0
0.0
0.2
0.4
0.6
Output current : Io [A]
0.8
Figure 7. Magnetic hysteresis
Figure 8. Output H voltage
(Temperature characteristics)
1.0
1.0
0.8
0.8
Output H voltage : Voh [V]
0.6
Output L voltage : Vol [V]
1.8V
0.6
0.4
0.4
85℃
25℃
-40℃
5.0V
0.2
5.5V
0.2
0.0
0.0
0.2
0.4
0.6
Output current : Io [A]
0.8
0.0
0.0
0.2
0.4
0.6
Output current : Io [A]
0.8
Figure 9. Output H voltage
(Voltage characteristics)
Figure 10. Output L voltage
(Temperature characteristics)
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111
・
15
・
001
5/16
TSZ02201-0H1H0B100090-1-2
31.Jul.2012 Rev.002
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