Datasheet
RESET
OUT
OUT
6
5
4
IN
IN
EN
GND
3
28
24
23
V
I
C1
0.1 µF
50 V
RESET
V
O
10 µF
+
TPS767D3xx
C
O
250 kΩ
V
O
+ V
ref
ǒ
1 )
R1
R2
Ǔ
where:
V
ref
= 1.1834 V typ (the internal reference voltage)
R1 +
ǒ
V
O
V
ref
* 1
Ǔ
R2
OUTPUT
VOLTAGE
R1 R2
2.5 V
3.3 V
3.6 V
4 75V
UNIT
33.2
53.6
61.9
90.8
30.1
30.1
30.1
30.1
kΩ
kΩ
kΩ
kΩ
OUTPUT VOLTAGE
PROGRAMMING GUIDE
V
O
V
I
RESET
OUT
FB / NC
R1
R2
GND
EN
IN
<0.5V
>2.7 V
RESET Output
0.1 µF
250 kΩ
+
10 µF
C
O
TPS767D301-EP
www.ti.com
SGLS327A –FEBRUARY 2006–REVISED APRIL 2010
Figure 26. Typical Application Circuit (Fixed Versions) for Single Channel
Programming the TPS767D301-EP Adjustable LDO Regulator
The output voltage of the TPS767D301-EP adjustable regulator is programmed using an external resistor divider
as shown in Figure 27. The output voltage is calculated using:
(1)
Resistors R1 and R2 should be chosen for approximately 50-mA 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 kΩ
to set the divider current at 50 mA and then calculate R1 using:
(2)
Figure 27. TPS767D301-EP Adjustable LDO Regulator Programming
Reset Indicator
The TPS767D301-EP features a RESET output that can be used to monitor the status of the regulator. The
internal comparator monitors the output voltage. When the output drops to 95% (typical) of its regulated value,
the RESET output transistor turns on, taking the signal low. The open-drain output requires a pullup resistor. If
not used, it can be left floating. RESET can be used to drive power-on reset circuitry or as a low-battery
indicator.
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