ts39154cp4ro Taiwan Semiconductor Company, Ltd. (TSC), ts39154cp4ro Datasheet - Page 5

• Manufacturer Part Number: ts39154cp4ro
• Description: 1.5a Ultra Low Ldo With Enable
• Manufacturer: Taiwan Semiconductor Company, Ltd. (TSC)

Application Information (Continue)
Thermal Characteristics
TS39154 linear regulators are simple to use, the most complicated design parameters to consider are thermal
characteristics, thermal design requires the following application specification parameters:




Calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet,
where the ground current is taken from data sheet.
P
The heat sink thermal resistance is determined by:
Ө
Where
applications where the minimum input voltage is know and is large compared with the dropout voltage and distribute
the heat between this resistor and the regulator. The low dropout properties of vertical PNP regulators allow
significant reductions in regulator power dissipation and the associated heat sink without compromising performance.
When this technique is employed, a capacitor of at least 1uF is needed directly between the input and regulator
ground.
D
SA
Maximum ambient temperature, T
Output current, I
Output voltage, V
Input voltage, V
= (V
= (T
T
IN
J(MAX)
J(MAX)
– V
OUT
– T
≤ 125
) x I
A
IN
OUT
) / P
OUT
OUT
o
C
D
+ V
and
– (Ө
IN
JC
Ө
x I
CS
+ Ө
GND
is between 0
A
CS
)
o
C
and 2
5/7
o
C
/W. The heat sink may by significantly reduced in
1.5A Ultra Low LDO with Enable
TS39154
Version: D08