HIP6014 datasheet(6/12 Pages) INTERSIL

6 / 12 page

operation with an overload condition. Note that the inductor

current increases to over 15A during the CSS charging interval

and causes an over-current trip. The converter dissipates very

little power with this method. The measured input power for the

conditions of Figure 4 is 2.5W.

The over-current function will trip at a peak inductor current

(IPEAK) determined by:

where IOCSET is the internal OCSET current source (200µA

typical). The OC trip point varies mainly due to the

MOSFET’s rDS(ON) variations. To avoid over-current tripping

in the normal operating load range, ﬁnd the ROCSET resistor

from the equation above with:

1. The maximum rDS(ON) at the highest junction temperature.

2. The minimum IOCSET from the speciﬁcation table.

3. Determine IPEAK for

where

∆I is the output inductor ripple current.

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

ROCSET to smooth the voltage across ROCSET in the

presence of switching noise on the input voltage.

Output Voltage Program

The output voltage of a HIP6014 converter is programmed

to discrete levels between 1.8VDC and 3.5VDC. The

voltage 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.

TIME (20ms/DIV.)

10A

15A

FIGURE 4. OVER-CURRENT OPERATION

PEAK

OCSET

•

DS ON

()

---------------------------------------------------

PEAK

OUT MAX

()

∆I

() 2

⁄

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

01111

11111

01110

11110

2.1

01101

11101

2.2

01100

11100

2.3

01011

11011

2.4

01010

11010

2.5

01001

11001

2.6

01000

11000

2.7

00111

10111

2.8

00110

10110

2.9

00101

1.80

10101

3.0

00100

1.85

10100

3.1

00011

1.90

10011

3.2

00010

1.95

10010

3.3

00001

2.00

10001

3.4

00000

2.05

10000

3.5

NOTE: 0 = connected to GND or VSS, 1 = connected to VDD through pull-up resistors

HIP6014

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