Datasheet
THS4271
THS4275
www.ti.com
SLOS397F –JULY 2002–REVISED OCTOBER 2009
APPLICATION INFORMATION
The die temperature can be approximated with the
MAXIMUM DIE TEMPERATURE TO PREVENT
following formula:
OSCILLATION
Die Temperature = P
DISS
× θ
JA
+ T
A
The THS4271 and THS4275 may have low-level
Where:
oscillation when the die temperature (also called
P
DISS
= (V
S+
– V
S–
) × (I
Q
+ I
LOAD
) – (V
OUT
× I
LOAD
)
junction temperature) exceeds +60°C.
Table 1 shows the estimated the maximum ambient
The oscillation is a result of the internal design of the
temperature (T
A
max) in degrees Celsius for each
bias circuit, and external configuration is not expected
package option of the THS4271 and THS4275 using
to mitigate or reduce the problem. This problem
the thermal dissipation rating given in the Dissipation
occurs randomly because of normal process
Ratings table for a JEDEC standard High-K test PCB.
variations and normal testing cannot identify problem
For each case shown, R
L
= 499 Ω to ground and the
units.
quiescent current = 27 mA (the maximum over the
The THS4211 and THS4215 are recommended
0°C to +70°C temperature range). The last entry for
replacement devices.
each package option (shaded cells) lists the
worst-case scenario where the power supply is
The die temperature depends on the power
single-supply 10 V and ground and the output voltage
dissipation and the thermal resistance of the device.
is 5 V DC.
space
Table 1. Estimated Maximum Ambient Temperature Per Package Option
PACKAGE
DEVICE V
S+
V
S–
V
OUT
θ
JA
T
A
max
SOIC 0 V 33.7°C
THS4271D 2 V
PP
32.4°C
THS4271DR 5 V –5 V 4 V
PP
31.3°C
97.5°C/W
THS4275D 6 V
PP
30.4°C
THS4275DR 8 V
PP
29.7°C
Worst Case 10 V 0 V 5 DC 28.8°C
VSON 0 V 47.6°C
THS4271DRBT 2 V
PP
47.0°C
THS4271DRBR 5 V –5 V 4 V
PP
46.5°C
45.8°C/W
THS4275DRBT 6 V
PP
46.1°C
THS4275DRBR 8 V
PP
45.8°C
Worst Case 10 V 0 V 5 DC 45.3°C
PowerPad™ MSOP 0 V 44.2°C
THS4271DGN 2 V
PP
43.5°C
THS4271DGNR 5 V –5 V 4 V
PP
42.8°C
58.4°C/W
THS4275DGN 6 V
PP
42.3°C
THS4275DGNR 8 V
PP
41.9°C
Worst Case 10 V 0 V 5 DC 41.3°C
MSOP 0 V –10.2°C
THS4271DGK 2 V
PP
–13.6°C
THS4271DGKR 5 V –5 V 4 V
PP
–16.5°C
260°C/W
THS4275DGK 6 V
PP
–18.9°C
THS4275DGKR 8 V
PP
–20.8°C
Worst Case 10 V 0 V 5 DC –23.2°C
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