TPS71501
TPS71525, TPS71530
TPS71533, TPS71550
SLVS338H 鈥?MAY 2001 鈥?REVISED JUNE 2004
www.ti.com
APPLICATION INFORMATION (continued)
The TPS715xx features internal current limiting. During normal operation, the TPS715xx limits output current to
approximately 500 mA. When current limiting engages, the output voltage scales back linearly until the
overcurrent condition ends. Take care not to exceed the power dissipation ratings of the package.
Programming the TPS71501 Adjustable LDO Regulator
The output voltage of the TPS71501 adjustable regulator is programmed using an external resistor divider as
shown in Figure 14. The output voltage is calculated using:
V
O
+
V
ref
1
)
R1
R2
(3)
where:
鈥?/div>
V
REF
= 1.205 V typ (the internal reference voltage)
Resistors R1 and R2 should be chosen for approximately 1.5-碌A divider current. Lower value resistors can be
used for improved noise performance, but the solution consumes more power. Higher resistor values should be
avoided as leakage current into/out of FB across R1/R2 creates an offset voltage that artificially in-
creases/decreases the feedback voltage and thus erroneously decreases/increases V
O
. The recommended
design procedure is to choose R2 = 1 M鈩?to set the divider current at 1.5 碌A, and then calculate R1 using:
R1
+
O
*
1
V
ref
V
R2
(4)
TPS71501
V
I
0.1
碌F
OUT
R1
FB
GND
R2
V
O
0.47
碌F
IN
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE
1.8 V
2.8 V
5.0 V
R1
0.499 M鈩?/div>
1.33 M鈩?/div>
3.16 M鈩?/div>
R2
1 M鈩?/div>
1 M鈩?/div>
1 M鈩?/div>
Figure 14. TPS71501 Adjustable LDO Regulator Programming
8
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TPS71523,TPS71525,TPS715345,TPS71550
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