For an equation for the ripple current see the section under

component guidelines titled ‘Output Inductor Selection’.

A small ceramic capacitor should be placed in parallel with

presence of switching noise on the input voltage.

Output Voltage Program

The output voltage of a HIP6004B converter is programmed

identification (VID) pins program an internal voltage reference

(DACOUT) with a TTL-compatible 5-bit digital-to-analog

converter (DAC). The level of DACOUT also sets the PGOOD

and OVP thresholds. Table 1 specifies the DACOUT voltage

for the 32 different combinations of connections on the VID

pins. The output voltage should not be adjusted while the

converter is delivering power. Remove input power before

changing the output voltage. Adjusting the output voltage

during operation could toggle the PGOOD signal and exercise

the overvoltage protection.

‘11111’ VID pin combination resulting in a 0V output setting

activates the Power-On Reset function and disables the gate

drives circuitry. For this specific VID combination, though,

PGOOD asserts a high level. This unusual behavior has been

implemented in order to allow for operation in dual-

microprocessor systems where AND-ing of the PGOOD signals

from two individual power converters is implemented.

Application Guidelines

Layout Considerations

As in any high frequency switching converter, layout is very

important. Switching current from one power device to another

can generate voltage transients across the impedances of the

interconnecting bond wires and circuit traces. These

interconnecting impedances should be minimized by using

wide, short printed circuit traces. The critical components

should be located as close together as possible, using ground

plane construction or single point grounding.

TABLE 1. OUTPUT VOLTAGE PROGRAM

PIN NAME

NOMINAL OUTPUT

VOLTAGE DACOUT

PIN NAME

NOMINAL OUTPUT

VOLTAGE DACOUT

VID4

VID3

VID2

VID1

VID0

VID4

VID3

VID2

VID1

VID0

011

11

1.30

1

1

1

1

1

0

011

10

1.35

1

1

1

1

0

2.1

011

01

1.40

1

1

1

0

1

2.2

011

00

1.45

1

1

1

0

0

2.3

010

11

1.50

1

1

0

1

1

2.4

010

10

1.55

1

1

0

1

0

2.5

010

01

1.60

1

1

0

0

1

2.6

010

00

1.65

1

1

0

0

0

2.7

001

11

1.70

1

0

1

1

1

2.8

001

10

1.75

1

0

1

1

0

2.9

001

01

1.80

1

0

1

0

1

3.0

001

00

1.85

1

0

1

0

0

3.1

000

11

1.90

1

0

0

1

1

3.2

000

10

1.95

1

0

0

1

0

3.3

000

01

2.00

1

0

0

0

1

3.4

000

00

2.05

1

0

0

0

0

3.5

HIP6004B