Technical Note
12/14
www.rohm.com
2010.05 - Rev.
© 2010 ROHM Co., Ltd. All rights reserved.
BD3506F,BD3506EFV
●Notes for use
1. Input terminals (VCC,VIN,EN)
In the present IC, EN terminal, VIN terminal, and VCC 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.
2. 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.
3. Permissible dissipation
With respect to the permissible dissipation, the thermal derating characteristics are shown in the Exhibit, which we hope
would be used as a good-rule-of-thumb. Should the IC be used in such a manner to exceed the permissible dissipation,
reduction of current capacity due to chip temperature rise, and other degraded properties inherent to the IC would result.
You are strongly urged to use the IC within the permissible dissipation.
4. Built-in thermal shutdown protection circuit
The thermal shutdown circuit is first and foremost intended for interrupt IC from thermal runaway, and is not intended to
protect and warrant the IC. Consequently, never attempt to continuously use the IC after this circuit is activated or to use
the circuit with the activation of the circuit premised.
5. Inspection by set substrate
In the event a capacitor is connected to a pin with low impedance at the time of inspection with a set substrate, there is a
fear of applying stress to the IC. Therefore, be sure to discharge electricity for every process. As electrostatic
measures, provide grounding in the assembly process, and take utmost care in transportation and storage. Furthermore,
when the set substrate is connected to a jig in the inspection process, be sure to turn OFF power supply to connect the jig
and be sure to turn OFF power supply to remove the jig.
6. 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..
7. The use in the strong electromagnetic field may sometimes cause malfunction, to which care must be taken.
8. 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.
9. We are certain that examples of applied circuit diagrams are recommendable, but you are requested to thoroughly confirm
the characteristics before using the IC. In addition, when the IC is used with the external circuit changed, decide the IC
with sufficient margin provided while consideration is being given not only to static characteristics but also variations of
external parts and our IC including transient characteristics.
OUTPUT PIN
(Example)
