TPS76815-EP, TPS76818-EP, TPS76825-EP, TPS76827-EP
TPS76828-EP, TPS76830-EP TPS76833-EP, TPS76850-EP, TPS76801-EP
FAST-TRANSIENT-RESPONSE 1-A LOW-DROPOUT VOLTAGE REGULATORS
SGLS011 鈥?MARCH 2003
APPLICATION INFORMATION
external capacitor requirements (continued)
TPS768xx
VI
6
7
C1
0.1
碌F
IN
IN
OUT
5
EN
OUT
14
13
+
Co
10
碌F
PG
16
PG
250 k鈩?/div>
VO
GND
3
Figure 26. Typical Application Circuit (Fixed Versions)
programming the TPS76801 adjustable LDO regulator
The output voltage of the TPS76801 adjustable regulator is programmed using an external resistor divider as
shown in Figure 27. The output voltage is calculated using:
V
Where:
V
ref
= 1.1834 V typ (the internal reference voltage)
Resistors R1 and R2 should be chosen for approximately 50-碌A(chǔ) divider current. Lower value resistors can be
used but offer no inherent advantage and waste more power. Higher values should be avoided as leakage
currents at FB increase the output voltage error. The recommended design procedure is to choose
R2 = 30.1 k鈩?to set the divider current at 50
碌A(chǔ)
and then calculate R1 using:
R1
+
O
*
1
V
ref
V
R2
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE
2.5 V
3.3 V
VO
R1
FB / NC
GND
3.6 V
4.75 V
R1
33.2
53.6
61.9
90.8
R2
30.1
30.1
30.1
30.1
UNIT
k鈩?/div>
k鈩?/div>
k鈩?/div>
k鈩?/div>
O
+
V
ref
1
)
R1
R2
(1)
(2)
TPS76801
VI
鈮?/div>
1.7 V
鈮?/div>
0.9 V
EN
OUT
IN
PG
PG
250 k鈩?/div>
0.1
碌F
R2
Figure 27. TPS76801 Adjustable LDO Regulator Programming
16
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
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