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SLVS181H − DECEMBER 1998 − REVISED JANUARY 2004
APPLICATION INFORMATION
TPS76301
OUTPUT VOLTAGE
PROGRAMMING GUIDE
DIVIDER RESISTANCE
1
OUTPUT
VOLTAGE
(V)
V
I
IN
(1)
(kΩ)
1 µF
R1
R2
5
V
2.5
3.3
3.6
4
187
301
348
402
549
750
169
169
169
169
169
169
OUT
FB
O
≥2 V
3
R1
R2
EN
≤0.5 V
4
+
4.7 µF
GND
2
5
CSR = 1 Ω
6.45
(1)
1% values shown.
Figure 21. TPS76301 Adjustable LDO Regulator Programming
power dissipation and junction temperature
Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature allowable
to avoid damaging the device is 150°C. This restriction limits the power dissipation the regulator can handle in any given
application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation,
PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max)
The maximum-power-dissipation limit is determined using the following equation:
T max * T
.
J
A
P
+
D(max)
R
qJA
Where:
T max is the maximum allowable junction temperature
J
R
is the thermal resistance junction-to-ambient for the package, see the dissipation rating table.
θJA
T is the ambient temperature.
A
The regulator dissipation is calculated using:
+ ǒVI * V
Ǔ
P
I
D
O
O
Power dissipation resulting from quiescent current is negligible.
14
TI [ TEXAS INSTRUMENTS ]
