SPM1006

Version 1.5

March 16, 2016

Page 10 of 22

APPLICATION INFORMATION

Output Voltage Programming

voltage is 0.6V without a resistor connected.

Note that the input voltage must be at least 1.5V higher than the output voltage

Fig. 13 Output Voltage Programming Circuit

A single standard 1% resistor can be used to program for any of the common voltages shown in Table 1.

Table 1 - Output Voltage Programming Resistor

0.8V

1.0V

1.2V

1.5V

1.8V

2.5V

3.3V

5.0V

33.2kΩ

16.5kΩ

11kΩ

7.32kΩ

5.49kΩ

3.48kΩ

2.43kΩ

1.5kΩ

The programming resistor can be calculated for any output voltage using equation (1).

1

6

.

0

/

11







V

V

k

R

OUT

PROG

(1)

Note that the VADJ pin is noise sensitive and the connections to this pin should be kept as short as possible.

Fig. 14. The resulting output voltage is a function of equation (2).

)

)

11

11

*

(

1

(

*

6

.

0

PROG

TRIM

TRIM

OUT

R

k

R

k

R

V

V











(2)

VADJ

VSENSE

0.6V

SPM1006

VOUT

AGND

PGND