Datasheet

V
OUT
V
REF
- 1 R =R
1 2
IN
EN
DELAY
GND
C
0.1 Fm
IN
C
0.1 Fm
DELAY
V
IN
PG
OUT
FB
R
1.07 MW
2
R
3.4 MW
1
R
1 MW
PG
C
2.2 Fm
OUT
V
5 V
OUT
TPS7A16
www.ti.com SBVS171D –DECEMBER 2011–REVISED JANUARY 2014
THEORY OF OPERATION
GENERAL DESCRIPTION
The TPS7A16 family of ultra-low power voltage regulators offers the benefit of ultra-low quiescent current, high
input voltage, and miniaturized, high thermal-performance packaging.
The TPS7A16 family is designed for continuous or sporadic (power backup) battery-operated applications where
ultra-low quiescent current is critical to extending system battery life.
ADJUSTABLE VOLTAGE OPERATION
The TPS7A1601 has an output voltage range from 1.194 V to 20 V. The nominal output of the device is set by
two external resistors, as shown in Figure 14:
Figure 14. Adjustable Operation
R
1
and R
2
can be calculated for any output voltage range using the formula shown in Equation 1:
(1)
Resistor Selection
It is recommended to use resistors in the order of MΩ to keep the overall quiescent current of the system as low
as possible (by making the current used by the resistor divider negligible compared to the device’s quiescent
current).
If greater voltage accuracy is required, take into account the voltage offset contributions as a result of feedback
current and use of 0.1% tolerance resistors.
Table 1 shows the resistor combination to achieve a few of the most common rails using commercially available
0.1% tolerance resistors to maximize nominal voltage accuracy, while abiding to the formula shown in
Equation 1.
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