Datasheet

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    
    
SLVS181H − DECEMBER 1998 − REVISED JANUARY 2004
www.ti.com
14
APPLICATION INFORMATION
V
O
V
I
OUT
FB
R2
GND
EN
IN
≤0.5 V
≥2 V
TPS76301
1 µF
OUTPUT
VOLTAGE
(V)
R1 R2
2.5
3.3
3.6
4
5
6.45
187
301
348
402
549
750
169
169
169
169
169
169
OUTPUT VOLTAGE
PROGRAMMING GUIDE
DIVIDER RESISTANCE
(kΩ)
(1)
(1)
1% values shown.
3
1
4
2
R1
5
CSR = 1 Ω
4.7 µF
+
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
D(max)
+
T
J
max * T
A
R
qJA
Where:
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
+
ǒ
V
I
* V
O
Ǔ
I
O
Power dissipation resulting from quiescent current is negligible.