IRU431LCL5TR International Rectifier, IRU431LCL5TR Datasheet - Page 5

• Manufacturer Part Number: IRU431LCL5TR
• Description: IC REG LDO LV ADJ SOT-23-5
• Manufacturer: International Rectifier

Specifications of IRU431LCL5TR

• Reference Type: Shunt, Adjustable
• Voltage - Output: 1.24 ~ 15 V
• Tolerance: ±1%
• Number Of Channels: 1
• Current - Cathode: 80µA
• Current - Output: 10mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Input: -
• Temperature Coefficient: -
• Current - Quiescent: -

Thermal Design
The IRU431L is offered in the surface mount SOT-23 (L)
packages. The SOT-23 package has the maximum power
dissipation capability of 150mW at T
rating factor of -1.2mW / C.
The table below summarizes the maximum power dissi-
pation capability of each package versus ambient tem-
perature.
In our previous example, the maximum power dissipa-
tion of the device is calculated under no load and maxi-
mum input supply condition.
The maximum power is calculated using the following
equation:
As shown in the power dissipation table, both packages
can handle this power dissipation.
Rev. 2.0
08/05/03
SOT-23
Pkg
P
Where:
P
For our example:
P
MAX
MAX
MAX
= V
= Maximum power dissipation of the IRU431L
= 3.3 3
150mW
25
KA
3
Ambient Temperature (T
(
(
6 - 3.3
132mW
V
100
40
MAX
R
- V
B
)
KA
120mW
= 89mW
)
50
A
=25 C with the de-
108mW
60
A
) 8 8 C
96mW
70
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Stability
The IRU431L has many different domains of stability as
a function of the cathode current. As is typical of three-
terminal shunt regulators, the IRU431L has many do-
mains of stability. The actual domain in which any prac-
tical circuit operates is related to cathode current. In
general the device will be unconditionally stable for any
cathode current if a capacitor, 1mF or larger, is connected
between the cathode and the anode. If the cathode cur-
rent is always higher than 3mA under minimum line and
maximum load conditions, the capacitor value can be
reduced to 0.01mF and the system will be stable.
IRU431L
5