TK71530ASCL TOKO, TK71530ASCL Datasheet - Page 9

• Manufacturer Part Number: TK71530ASCL
• Description: IC VOLTAGE REGULATOR 3.0V SOT-23
• Manufacturer: TOKO

Specifications of TK71530ASCL

• Regulator Topology: Positive Fixed
• Voltage - Output: 3V
• Voltage - Input: Up to 18V
• Voltage - Dropout (typical): 0.16V @ 100mA
• Number Of Regulators: 1
• Current - Output: 155mA
• Operating Temperature: -30°C ~ 80°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: Q1300249A

determine the power dissipation for shutdown when
mounted, attach the device on the actual PCB and delib-
erately increase the output current (or raise the input
voltage) until the thermal protection circuit is activated.
Calculate the power dissipation of the device by subtract-
ing the output power from the input power. These mea-
surements should allow for the ambient temperature of the
PCB. The value obtained from P
derating factor. The PCB mounting pad should provide
maximum thermal conductivity in order to maintain low
device temperatures. As a general rule, the lower the
temperature, the better the reliability of the device. The
thermal resistance when mounted is expressed as follows:
For Toko ICs, the internal limit for junction temperature is
150 °C. If the ambient temperature (T
P
simple way to determine P
the output side is shorted. Input current gradually falls as
temperature rises. You should use the value when thermal
equilibrium is reached.
The range of usable currents can also be found from the
graph below.
Procedure:
1)
March 2001 TOKO, Inc.
D
D PD
is the value when the thermal sensor is activated. A
P D
(mW)
T
150 °C = 0
0
Find P
jA
j
= 0
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
= 125 °C/ P
25
jA
3
6
D
x P
50
jA
D
+ T
x P
D
T A ( C)
A
D
75
+ 25 °C
D
5
is to calculate V
D
/(150 °C - T
4
A
) is 25 °C, then:
150
IN
x I
A
IN
) is the
when
2)
3)
4)
°C with a straight line.
5)
operating temperature (e.g., 75 °C) to the derating curve.
6)
the vertical line intersects the derating curve. This is taken
as the maximum power dissipation, D
The maximum operating current is:
SOT23-3 POWER DISSIPATION CURVE
P
Plot P
Connect P
In design, take a vertical line from the maximum
Read off the value of P
I
OUT
D1
500
400
300
200
100
is taken to be P
0
= (D
0
D1
against 25 °C
PD
D1
/ (V
to the point corresponding to the 150
50
IN(MAX)
T A (°C)
MOUNTED AS SHOWN
D
x (~ 0.8 - 0.9)
D
- V
against the point at which
100
OUT
TK715xxAS
FREE AIR
)
PD
.
150
Page 9