Datasheet

OUT REF
1
REF
FB
2
V V
R =
V
I
R
-
+
TPS7A4701
OUT
FB
GND
C
10 F
IN
m
C
1 F
NR/SS
m
R
1
R
2
C
47 F
OUT
m
IN
EN
NR
V
IN
V
OUT
TPS7A4700
TPS7A4701
www.ti.com SBVS204E –JUNE 2012–REVISED JANUARY 2014
Table 2 shows a list of the most common output voltages and their corresponding pin settings. The voltage
setting pins have a binary weight; therefore, the output voltage can be programmed to any value from 1.4 V to
20.5 V on 100-mV steps.
Table 2. Common Output Voltages and the Corresponding Pin Settings
PIN NAMES AND VOLTAGE PER PIN
0P1V 0P2V 0P4V 0P8V 1P6V 3P2V 6P4V1 6P4V2
V
OUT
(V) 100 mV 200 mV 400 mV 800 mV 1.6 V 3.2 V 6.4 V 6.4 V
1.4 Open Open Open Open Open Open Open Open
1.5 GND Open Open Open Open Open Open Open
1.8 Open Open GND Open Open Open Open Open
2.5 GND GND Open GND Open Open Open Open
3 Open Open Open Open GND Open Open Open
3.3 GND GND Open Open GND Open Open Open
4.5 GND GND GND GND GND Open Open Open
5 Open Open GND Open Open GND Open Open
10 Open GND GND Open GND Open GND Open
12 Open GND Open GND Open GND GND Open
15 Open Open Open GND Open Open GND GND
18 Open GND GND Open Open GND GND GND
20.5 GND GND GND GND GND GND GND GND
ADJUSTABLE OPERATION (TPS7A4701 ONLY)
The TPS7A4701 has an output voltage range of 1.4 V to 34 V. For adjustable operation, set the nominal output
voltage of the device using two external resistors, as shown in Figure 24.
Figure 24. Adjustable Operation for Maximum AC Performance
R
1
and R
2
can be calculated for any output voltage within the operational range. The current through feedback
resistor R
2
must be at least 5 µA to ensure stability. Additionally, the current into the FB pin (I
FB
, typically 350 nA)
creates an additional output voltage offset that depends on the resistance of R
1
. For high-accuracy applications,
select R
2
such that the current through R2 is at least 35 µA to minimize the effects I
FB
variation on the output
voltage; 10 kΩ is recommended. R
1
can be calculated using Equation 3.
where
• V
REF
= 1.4 V
• I
FB
= 350 nA (3)
Use 0.1% tolerance resistors to minimize the effects of resistor inaccuracy on the output voltage.
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