Technical Note
13/15
BD3507HFV
www.rohm.com
2010.05 - Rev.
© 2010 ROHM Co., Ltd. All rights reserved.
10. GND wiring pattern
If there are a small signal GND and a high current GND, it is recommended to separate the patterns for the high current
GND and the small signal GND and provide a proper grounding to the reference point of the set not to affect the voltage at
the small signal GND with the change in voltage due to resistance component of pattern wiring and high current. Also for
GND wiring pattern of component externally connected, pay special attention not to cause undesirable change to it.
11 Input terminals (V
CC
,V
IN
,EN,V
REF
)
In the present IC, EN terminal, V
IN
terminal, VCC terminal, and V
REF
terminal have an independent construction. In
addition, in order to prevent malfunction at the time of low input, the UVLO function is equipped with the VCC terminal.
They begin to start output voltage when all the terminals reach threshold voltage without depending on the input order of
input terminals.
12. Heat sink
Heatsink is connected to SUB, which should be short-circuited to GND. Solder the heatsink to a pc board properly, which
offers lower thermal resistance.
13. Operating range
Within the operating range, the operation and function of the circuits are generally guaranteed at an ambient temperature
within the range specified. The values specified for electrical characteristics may not be guaranteed, but drastic change
may not occur to such characteristics within the operating range.
14. For the present product, thoroughgoing quality control is carried out, but in the event that applied voltage, working
temperature range, and other absolute maximum rating are exceeded, the present product may be destroyed. Because
it is unable to identify the short mode, open mode, etc., if any special mode is assumed, which exceeds the absolute
maximum rating, physical safety measures are requested to be taken, such as fuses, etc.
15. In the event that load containing a large inductance component is connected to the output terminal, and generation of
back-EMF at the start-up and when output is turned OFF is assumed, it is requested to insert a protection diode.
HVSOF6 land pattern
Land Pitch
e
Land Space
MIE
Land Length
l2
Land Width
b2
0.50 2.20 0.55 0.25
Pad Length
D3
Pad Width
E3
1.60 1.60
In actually designing, optimize in accordance with the condition.
OUTPUT PIN
(Example)
MIE
E3
D3
e
b2
L2
Unit:mm
