PT6442 datasheet(5/8 Pages) TI1

Part #	PT6442

Description	6-A 5-V/3.3-V Input Adjustable Integrated Switching Regulator

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Application Notes

For technical support and more information, see inside back cover or visit www.ti.com

PT6440 Series

Adjusting the Output Voltage of the PT6440

Excalibur

 5V/3.3V Bus Step-Down ISRs

The output voltage of the PT6440 Series ISRs may be

adjusted higher or lower than the factory trimmed pre-

set voltage with the addition of a single external resistor.

Table 1 gives the allowable adjustment range for each

model for either series as Va (min) and Va (max).

Adjust Up:

An increase in the output voltage is obtained by

adding a resistor R2, between Vo Adj (pin 12) and GND

(pins 5–8).

Adjust Down:

Add a resistor (R1), between Vo Adj (pin 12)

and Vout (pins 9–11).

Figure 1

The values of (R1) [adjust down], and R2 [adjust up], can

also be calculated using the following formulas. Refer to

Figure 1 and Table 2 for both the placement and value of the

required resistor; either (R1) or R2 as appropriate.

(R1)

=

Ro (Va – 0.9)

– Rs

k

Ω

Vo – Va

R2

=

0.9 Ro

– Rs

k

Ω

Va – Vo

Where:

Vo = Original output voltage

Va = Adjusted output voltage

Ro = The resistance value from Table 1

Rs = The series resistance from Table 1

Table 1

ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS

Series Pt. #

PT6441

PT6442

PT6443

PT6444

PT6445

PT6446

PT6447

Vo (nom)

3.3

2.5

2.0

1.8

1.5

1.2

1.0

Va (min)

2.88

1.97

1.64

1.5

1.3

1.08

0.97

Va (max)

3.5

2.95

2.45

2.25

1.95

1.65

1.45

Ro (kΩ

Ω)

10.0

10.2

Rs (k

Ω)

49.9

20.0

R

2

Adjust Up

C

2

+V

O

COM

+V

IN

+

(R

1)

Adj Down

PT6440

2,3,4

5–8

12

9,10,11

Vin

Vo

Vo(adj)

GND

C

1

+

Notes:

1. Use only a single 1% resistor in either the (R1) or R2

location. Place the resistor as close to the ISR as possible.

2. Never connect capacitors from Vo adj to either GND or

Vout. Any capacitance added to the Vo adjust pin will affect

the stability of the ISR.

3. For each model, adjustments to the output voltage may

place additional limits on the minimum input voltage.

The revised minimum input voltage must comply with the

following requirement.

Vin(min) = (Va + 0.5)V or as specified in the data sheet,

whichever is greater.

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