IN

EN

DELAY

GND

C

0.1

F

m

IN

C

0.1

F

m

DELAY

V

IN

PG

OUT

FB

R

1.07 M

W

2

R

3.4 M

W

1

R

1 M

W

PG

C

2.2

F

m

OUT

V

5 V

OUT

V

OUT

V

REF

- 1

R =R

1

2

TPS7A16

www.ti.com

SBVS171A

– DECEMBER 2011 – REVISED DECEMBER 2011

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

(1)

Resistor Selection

It is recommended to use resistors in the order of M

Ω 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.

Copyright

© 2011, Texas Instruments Incorporated

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