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PDF BU6909AGFT Data sheet ( Hoja de datos )
| Número de pieza | BU6909AGFT | |
| Descripción | 5V Single-phase Full-wave Fan Motor Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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DC Brushless Fan Motor Driver
5V Single-phase Full-wave
Fan Motor Driver
BU6909AGFT
Description
The BU6909AGFT is a 5V single-phase full-wave FAN motor driver with built in HALL element. It is part of the DC brushless
FAN motor driver series. BU6909AGFT is built in a compact package and provides Auto Gain Control function (AGC), silent
drive by soft switching, and low battery consumption via its standby function. BU6909AGFT is best used for notebook 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
Incorporates lock protection and automatic restart
circuit
Compact package (GFT:TSSOF6 flat lead package)
When TSSOF6 is mounted, package thickness is
0.3mm
Rotating speed pulse signal (FG) output
PWM speed control
Package
TSSOF6
W(Typ) x D(Typ) x H(Max)
2.90mm x 3.80mm x 0.8mm
TSSOF6
Applications
For compact 5V FAN such as notebook PC cooling FAN
Absolute Maximum Ratings
Parameter
Symbol
Limit
Supply Voltage
Power Dissipation
VCC
Pd
7
0.54(Note 1)
Operating Temperature
Topr -40 to +85
Storage Temperature
Tstg -55 to +125
Output Voltage
Output Current
FG Signal Output Voltage
FG Signal Output Current
Junction Temperature
VOMAX
IOMAX
VFG
IFG
Tjmax
7
800(Note 2)
7
10
125
(Note 1) Reduce by 5.4mW/℃ over 25℃. (On 70.0mm×70.0mm×1.6mm glass epoxy board)
(Note 2) This value is not to exceed Pd.
Unit
V
W
°C
°C
V
mA
V
mA
°C
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated
over the absolute maximum ratings.
Recommended Operating Condition
Parameter
Operating Supply Voltage Range
Symbol
VCC
Limit
1.8 to 5.5
Unit
V
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no protection against radioactive rays
1/18
TSZ02201-0H1H0B101190-1-2
28.Oct.2014 Rev.002
1 page  
BU6909AGFT
Typical Performance Curves - continued
3.0
1.0
Datasheet
2.5
85℃
0.8
2.0 25℃
-40℃
1.5
0.6
1.0
0.4 85°C
25°C
-40°C
0.5 0.2
Operating voltage range
0.0 0.0
123456
Supply voltage : Vcc [V]
0.0 0.2 0.4 0.6 0.8
Output current : IO [A]
Figure 7. Magnetic hysteresis
Figure 8. Output H Voltage
(Temperature Characteristics)
1.0
0.8
0.6
0.4
0.2
0.0
0.0
1.0
0.8
1.8V
5.0V
5.5V
0.6
0.4
0.2
0.2 0.4 0.6
Output current : IO [A]
Figure 9. Output H Voltage
(Voltage Characteristics)
0.0
0.8 0.0
85°C
25°C
-40°C
0.2 0.4 0.6
Output current : IO [A]
Figure 10. Output L Voltage
(Temperature Characteristics)
0.8
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/18
TSZ02201-0H1H0B101190-1-2
28.Oct.2014 Rev.002
5 Page 
BU6909AGFT
Datasheet
Low duty start up function
During motor start up from stop condition, outputs are driven by a PWM signal of about PWM 50% duty for 3 times of
changing magnetic direction. After the low PWM duty start up function, output PWM duty changes corresponding to the
input PWM duty. For cases of input PWM duty range of more than 50%, output PWM duty changes corresponding to same
input PWM duty at all driving time. This function enables the IC to start the motor regardless of input PWM signal’s duty.
When input PWM duty is 0%, the motor is held on stand-by mode. Additionally, the motor changes to idling mode for input
PWM duty range of 0% to 2.5%. Idling mode only runs on circuit current 1 (ICC1) in the Electrical Characteristics table. Idling
mode turns all output terminals to open state.
(a) Case A : Input PWM DUTY 2.5% to 50%
(b) Case B : Input PWM DUTY 50% to 100%
Figure 23. Low duty start up function
Table 1. Truth table of input PWM duty and each outputs terminals
Input PWM duty [%]
IC function (state)
OUT1, OUT2
FG
DUTY 0
OFF (Stand-by mode)
OFF, OFF (Open state)
H (Output Tr : OFF)
DUTY 0 < 2.5
ON (Idle mode)
OFF, OFF (Open state)
H (Output Tr : OFF)
Case A : DUTY 2.5 to 50
ON
(Low duty start up
driving)
H / L, L / H
H/L
Case B : DUTY 50 to 100 ON (Normal driving)
H / L, L / H
H/L
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/18
TSZ02201-0H1H0B101190-1-2
28.Oct.2014 Rev.002
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet BU6909AGFT.PDF ] | |
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