BD3951F-E2 Rohm Semiconductor, BD3951F-E2 Datasheet - Page 6

• Manufacturer Part Number: BD3951F-E2
• Description: IC REG LDO W/VOLT DETECT 8SOP
• Manufacturer: Rohm Semiconductor

Specifications of BD3951F-E2

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: 6 ~ 20 V
• Voltage - Dropout (typical): 0.31V @ 100mA
• Number Of Regulators: 1
• Current - Output: 150mA (Min)
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOP
• Primary Input Voltage: 13.5V
• Output Voltage: 5.1V
• Dropout Voltage Vdo: 310mV
• No. Of Pins: 8
• Output Current: 150mA
• Voltage Regulator Case Style: SOP
• Operating Temperature Range: -40°C To +125°C
• Svhc: No
• Mounting Style: SMD/SMT
• Output Voltage Fixed: 5.1V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

●Thermal Design
BD3951F
© 2009 ROHM Co., Ltd. All rights reserved.
www.rohm.com
Please consider about power dissipation de-rating curve for high temperature operations. IC characteristics receive great
effect from operating ambient temperature. If junction temperature exceeds rating temperature (Tjmax), device might
degrade or be demolished permanently.
reliability.To prevent thermal destroy, IC must be operated under the condition that junction temperature is less than Tjmax.
SOP8 package power dissipation temperature de-rating curve is shown in Fig. 17. Operating condition must be less than
power dissipation curve. Calculation formula is as below.
Derive IOUT as operation is less than power dissipation curve,
IOUT max is defined by Vcc and VOUT.
·Example
Power consumption (Pc) has to be less than power dissipation curve along with the temperature.
The equation under short circuit condition (VOUT-GND short) is as below.
IOUT ≤
IOUT ≤
Ta=85℃, Vcc=13.5V and VOUT=5V
Pc=(Vcc-VOUT)×IOUT+Vcc×Icc
Power Dissipation Pd ≤ Pc
IOUT≤41.8mA (Icc=135μA)
Pc=Vcc×(Icc+Ishort) Ishort=Short Current
0.357-13.5×Icc
Pd-Vcc×Icc
Vcc-VOUT
13.5-5
1000
800
600
400
200
687
0
(Icc is shown in Fig. 1)
0
25
Glass Epoxy Board
Mount Condition Θj-a=181.8 (℃/W)
θja=181.8℃/W→-5.5mW/℃
25℃=687mW→85℃=357mW
Heat design should take consideration from both instant demolish and long life
50
Ta
Fig.17
75
(70mm×70mm×1.6mm)
[
℃
100
6/9
]
125
Vcc
VOUT
IOUT
Icc
150
:
:
:
:
Input Voltage
Output Voltage
Output Current
Circuit Current
Technical Note
2009.07 - Rev.A