BA15DD0WT Rohm Semiconductor, BA15DD0WT Datasheet - Page 6

• Manufacturer Part Number: BA15DD0WT
• Description: Low Dropout (LDO) Regulators
• Manufacturer: Rohm Semiconductor

Specifications of BA15DD0WT

• Number Of Outputs: 1
• Polarity: Positive
• Output Voltage: 1.5 V
• Output Type: Fixed
• Dropout Voltage (max): 0.5 V at 1 A
• Output Current: 2 A
• Line Regulation: 50 mV
• Load Regulation: 200 mV
• Voltage Regulation Accuracy: 1 %
• Maximum Power Dissipation: 2 W
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• Package / Case: TO-220FP
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Details

Fig.30 shows the acceptable loss and heat reducing characteristics of the TO220FP package The portion shown by the
diagonal line is the acceptable loss range that can be used with the IC alone. Even when the ambient temperature Ta is a normal
temperature (25℃), the chip (junction) temperature Tj may be quite high so please operate the IC at temperatures less than the
acceptable loss Pd.
The method of calculating the power consumption Pc(W) is as follows.
Solving this for load current IO in order to operate within the acceptable loss:
It is then possible to find the maximum load current Io
・Calculation Example
●Peripheral Circuit Considerations
●Vo Terminal
・Vcc Terminal
・GND Terminal
・CTL Terminal
due to factors such as temperature changes, making it impossible to completely stop oscillations. Please use a tantalum
capacitor or aluminum electrolysis capacitor with favorable characteristics and small internal series resistance (ESR) even at
low temperatures. The output fluctuates regardless of whether the ESR is large or small. Please use the IC within the stable
operating region while referring to the ESR characteristics reference data shown in Figs.32 through 34. In applications where
there are sudden load fluctuations, the use of a capacitor with large capacitance is recommended.
series.
method.
with the board’s wiring impedance, input impedance, and/or load impedance. Therefore, be certain to ascertain the final status
of these items for actual use.
connected as close to the input pin-GND as location possible. However, in situations such as rapid fluctuation of the input
voltage or the load, please check the operation in real application to determine proper capacitance.
Please attach an anti-oscillation capacitor between V
Below figure , it is ESR-to-Io stability Area characteristics ,measured by 22μＦ-ceramic-capacitor and resistor connected in
This characteristics is
Note, however, that the stable range suggested in the figure depends on the IC and the resistance load involved, and can vary
Keep capacitor capacitance within a range of 22μF～1000μF. It is also recommended that a 0.33μF bypass capacitor be
Example 1) When Ta=85℃, Vcc=8.3V, Vo=3.3V, BA33DD0WT
Fig.32 Output Equivalent Circuit
IC
Please refer to the above information and keep thermal designs within the scope of acceptable loss for all operating
temperature ranges.
The power consumption Pc of the IC when there is a short circuit (short between Vo and GND) is :
Please attach a capacitor (greater than 0.33μF) between the Vcc and GND.
The capacitance values will differ depending on the application, so please take this into account when configuring the
terminal.
Please be sure to keep the set ground and IC ground at the same potential level so that a potential difference does not arise
between them.
If a potential difference arises between the set ground and the IC ground, the preset voltage will not be outputted, causing
the system to become unstable. Therefore, please reduce the impedance by making the ground patterns as wide as
possible and by reducing the distance between the set ground and the IC ground as much as possible.
The CTL terminal is turned ON at 2.0V and higher and OFF at 0.8V and lower within the operating power supply voltage
range.
The power supply and the CTL terminal may be started up and shut down in any order without problems.
Pc = (Vcc-Vo) × Io ＋ Vcc × Icca
Acceptable loss Pd≦Pc
Io≦
Io≦
Io≦200mA (Icca : 2mA)
Pc=Vcc×(Icca＋Ishort)
Pd – Vcc×Icca
1.04－8.3×Icca
Vcc－Vo
5
OUT
not
22μF
equal value perfectly to 22μＦ-aluminum electrolytic capacitor in order to measurement
（Please refer to Figs.8 and 20 for Icca.）
100
10
0.1
1
0
Fig.33 ESR-Io Characteristics
With the IC alone : θja=62.5℃/W → -16mW/℃
25℃=2000mW → 85℃=1040mW
200
(BA□□CC0,22μF)
OUTPUT CURRENT：lo(mA)
Stable operating region
Unstable operating region
MAX
400
Unstable operating region
cc
with respect to the applied voltage Vcc at the time of thermal design.
and GND. The capacitance of the capacitor may significantly change
600
6/8
800
＊Ishort : Short circuit current
1000
10
0.1
100
1
1
Fig.34 ESR vs Io Characteristics
（BA□□DD0,22μF）
10
Unstable operating region
OUTPUT CURRENT：lo(mA)
Stable operating region
Icca：
Vcc：
Vo：
Io：
Input voltage
Output voltage
Load current
Circuit current
100
Unstable operating region
1000