TPS76301, TPS76316, TPS76318, TPS76325, TPS76327
TPS76328, TPS76330, TPS76333, TPS76338, TPS76350
LOW POWER 150 mA LOW DROPOUT LINEAR REGULATORS
SLVS181H − DECEMBER 1998 − REVISED JANUARY 2004
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APPLICATION INFORMATION
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE
(V)
2.5
3.3
3.6
4
5
DIVIDER RESISTANCE
(kΩ)
(1)
R1
187
301
348
402
549
R2
169
169
169
169
169
169
VI
1
µF
1
TPS76301
IN
5
R1
FB
GND
2
4
R2
+
4.7
µF
≥
2 V
≤
0.5 V
OUT
3
EN
VO
750
6.45
(1) 1% values shown.
CSR = 1
Ω
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,
P
D(max)
, and the actual dissipation, P
D
, which must be less than or equal to P
D(max)
.
The maximum-power-dissipation limit is determined using the following equation:
P
Where:
T max
*
T
A
+
J
D(max)
R
qJA
T
J
max is the maximum allowable junction temperature
R
θJA
is the thermal resistance junction-to-ambient for the package, see the dissipation rating table.
T
A
is the ambient temperature.
The regulator dissipation is calculated using:
P
D
+
V
*
V
I
O
I
O
Power dissipation resulting from quiescent current is negligible.
14
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