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APPLICATION INFORMATION

ADJUSTING THE OUTPUT VOLTAGE

GND

PTH12050

1

6

3

4

2

Track

VI

VO

GND

Inhibit

Adjust

3.3V

>

5

C1

100 F

(Required)

m

C2*

10 F

Ceramic

m

R

,

1%

SET

C3

100 F

(Optional)

m

PTH12050W/L

SLTS214H – MAY 2003 – REVISED OCTOBER 2007

1.2 V to 5.5 V for the W-suffix modules and 0.8 V to 1.8 V for L-suffix modules. The adjustment method requires

pins. Table 1 gives the standard value of the external resistor for a number of standard voltages, along with the

actual output voltage that this resistance value provides. For other output voltages, the value of the required

resistor can either be calculated using Equation 1, or simply selected from the range of values given in

Table 3.Figure 10 shows the placement of the required resistor.

PTH12050W

PTH12050L

(Required) (V)

(Actual) (V)

(Actual) (V)

5

0.280

5.009

N/A

N/A

3.3

2.0

3.294

N/A

N/A

2.5

4.32

2.503

N/A

N/A

2

8.06

2.010

N/A

N/A

1.8

11.5

1.801

0.130

1.800

1.5

24.3

1.506

3.57

1.499

1.2

Open

1.200

12.1

1.201

1.1

N/A

N/A

18.7

1.101

1.0

N/A

N/A

32.4

0.999

0.9

N/A

N/A

71.5

0.901

0.8

N/A

N/A

Open

0.800

(1)

A 0.05-W rated resistor can be used. The tolerance should be 1%, with a temperature stability of 100 ppm/

°C or

better. Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 5 and 1

using dedicated PCB traces.

(2)

stability of the regulator.

8

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