t6328a TM Technology Inc., t6328a Datasheet - Page 5

• Manufacturer Part Number: t6328a
• Description: 500ma Low Dropout Voltage Regulator
• Manufacturer: TM Technology Inc.

tm
Thermal Considerations
Thermal protection limits power dissipation in T6328A. When the operating junction temperature
exceeds 165
The pass element turns on again after the junction temperature cools by 30
operation, do not exceed absolute maximum operatiog junction temperature 125
dissipation definition in device is shown as following formula :
P
The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the
rate of surroundings airflow and temperature difference between junction to ambient. The
maximum power dissipation can be calculated by following formula :
P
Where T
temperature and the θ
conditions specification of T6328A, where T
(125
θ
SOT-89/ SOT-223 package is 300
power dissipation at T
P
P
P
The maximum power dissipation depends on operating ambient temperature for fixed T
thermal resistance θ
TM Technology Inc. reserves the right
to change products or specifications without notice.
JA
D
D(MAX)
D(MAX)
D(MAX)
D(MAX)
= (V
is layout dependent) for SOT-23-3/SOT-23-5 package is 250
°C
) and T
IN
= ( T
J(MAX)
= (125
= (125
= (125
- V
CH
°C
TE
OUT
A
, the OTP circuit starts the thermal shutdown function and turns the pass element off.
J(MAX)
°C -
°C -
°C -
is the maximum ambient temperature. The junction to ambient thermal resistance
is the maximum operating junction temperature 125
) x I
JA
25
25
25
JA
- TA ) / θ
A
OUT
For T6328A packages.
°C
°C
°C
= 25
is the junction to ambient thermal resistance. For recommended operating
)/250 = 400mW (SOT-23-3/SOT-23-5)
)/333 = 300mW (SC-82)
)/200 = 500mW (SOT-89/ SOT-223)
+ V
°C
IN
JA
can be calculated by following formula :
x I
°C/
Q
W on standard JEDEC 51-3 thermal test board. The maximum
J(MAX)
P. 5
is the maximum junction temperature of the die
°C/
W, SC-82 package is 333
Publication Date: OCT. 2007
°C
, T
°C
A
. For continuous
is the ambient
°C
. The power
J(MAX)
T6328A
Revision: A
°C/
and
W,