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BD42530EFJ-C Datasheet(PDF) 16 Page - Rohm

Part No. BD42530EFJ-C
Description  250 mA Output Voltage Tracker
Download  29 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD42530EFJ-C Datasheet(HTML) 16 Page - Rohm

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Datasheet
Datasheet
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BD42530xxx-C
Series
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
www.rohm.com
TSZ02201-0G7G0AN00550-1-2
20.Apr.2016 Rev.001
Thermal Design
Within this product, the power consumption is decided by the dropout voltage condition, the load current and the circuit
current. Refer to Package Data illustrated in Figure 20, 21 when using the IC in an environment of Ta ≥ 25 °C. Even if the
ambient temperature Ta is at 25 °C, depending on the input voltage and the load current, chip junction temperature can be
very high. Consider the design to be Tj ≤ Tjmax = 150 °C in all possible operating temperature range. On the reverse side of
the package (HTSOP-J8, TO263-5) there is exposed heat pad for improving the heat dissipation.
Should by any condition the maximum junction temperature Tjmax = 150 °C rating be exceeded by the temperature increase
of the chip, it may result in deterioration of the properties of the chip. The thermal impedance in this specification is based on
recommended PCB and measurement condition by JEDEC standard. Verify the application and allow sufficient margins in
the thermal design by the following method is used to calculate the junction temperature Tj.
Tj can be calculated by either of the two following methods.
1.
The following method is used to calculate the junction temperature Tj.
TjTaPCθJA
Where:
Tj
: Junction Temperature
Ta
: Ambient Temperature
PC
: Power Consumption
θJA
: Thermal Impedance
(Junction to Ambient)
2. The following method is also used to calculate the junction temperature Tj.
TjTTPCΨJT
Where:
Tj
: Junction Temperature
TT
: Top Center of Case’s (mold) Temperature
PC
: Power consumption
ΨJT
: Thermal Impedance
(Junction to Top Center of Case)
The following method is used to calculate the power consumption Pc (W).
PcVCC‐VO IOVCCICC
Where:
PC
: Power Consumption
VCC
: Input Voltage
VO
: Output Voltage
IO
: Load Current
ICC
: Circuit Current


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