Datasheet

14/20

BAxxDD0xx

BAxxCC0xx

TSZ02201-0R6R0A600130-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

TSZ22111･15･001

26.Jun.2012 Rev.001

www.rohm.com

When using at temperatures over Ta=25℃, please refer to the heat reducing characteristics shown in Fig.29 through 31.

The IC characteristics are closely related to the temperature at which the IC is used and if the temperature exceeds the

destruction and long-term operating reliability, it is necessary give sufficient consideration to IC heat. In order to protect the

of the IC.

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.

Pc = (Vcc-Vo) × Io

＋ Vcc × Icca

Acceptable loss Pd≦Pc

Io≦

(Please refer to Fig.10 and 22 for Icca.)

・Calculation Example

Example 1) When Ta=85℃, Vcc=8.3V, Vo=3.3V, BA33DD0WT

Io≦

With the IC alone : θja=62.5℃/W → -16mW/℃

Io≦200mA (Icca : 2mA)

25℃=2000mW → 85℃=1040mW

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:

Pc=Vcc×(Icca＋Ishort)

*Ishort: Short circuit current

●Peripheral Circuit Considerations

・Vcc Terminal

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.

・GND 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.

・CTL Terminal

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.

●Vo Terminal

Fig.32 Output Equivalent Circuit

Fig.33 ESR-Io Characteristics

Fig.34 ESR vs. Io Characteristics

(BAxxCC0)

(BAxxDD0)

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 Fig.32 through 34. In applications

where there are sudden load fluctuations, the use of a capacitor with large capacitance is recommended.

Pd – Vcc×Icca

Vcc－Vo

Vcc：

Vo：

Io：

Vcca：

Input voltage

Output voltage

Load current

Circuit current

1.04－8.3×Icca

5

OUT

22μF

IC

OUTPUT

CURRENT：lo(mA)

10000

1

0.1

1

10

1

Unstable operating region

Unstable operating region

Stable operating region

10

100

1000

100

200

400

800

1000

0.1

1

10

Stable operating region

0

600

Unstable operating region

Unstable operating region

OUTPUT

CURRENT：lo(mA)

100