HIP6004EVAL3 Intersil, HIP6004EVAL3 Datasheet - Page 2

• Manufacturer Part Number: HIP6004EVAL3
• Description: EVALUATION BOARD EMBED HIP6004
• Manufacturer: Intersil

Specifications of HIP6004EVAL3

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.3 ~ 3.5V
• Current - Output: 14A
• Voltage - Input: 5 ~ 12V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: HIP6004
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Frequency - Switching: -

For a given output voltage and load, the efficiency is lower at
higher input voltages. This is due primarily to higher
MOSFET switching losses and is displayed in Figure 2.
Transient Response
Figures 3 and 4 show laboratory oscillograms of the
HIP6004EVAL3 in response to a load transient application.
The load transient applied is from 0A to 14A for both figures.
In Figure 3, the transient is applied using an Intel test tool
which emulates the actual dynamic performance of the
Pentium II and other future processors. Slew rates approach
30A/ s. The input voltage is 12V and the output voltage is
programmed to 2.05V for this case.
Due to the analog nature of the HIP600x VID pins (see
HIP6004 data sheet for details), the 5 VID pins must be
grounded by installing jumpers JP0-4 on the evaluation
board when the Intel test tool is used. This programs the
converter output voltage to 2.05V, which is lower than
present microprocessors require. However, the intent of
using the Intel test tool is to validate the DC-DC converter
FIGURE 3. HIP6004EVAL3 TRANSIENT RESPONSE TO
2.05
1.95
2.15
75
70
90
80
85
FIGURE 2. HIP6004EVAL3 EFFICIENCY vs LOAD
VIN = 5V
INTEL TEST TOOL
2
VIN = 12V
4
LOAD CURRENT (A)
TIME (100 s/DIV)
6
2
8
+5% REGULATION LIMIT
-5% REGULATION LIMIT
VOUT = 2.8V
10
Application Note 9706
12
14
design under worst-case transient loads. Testing the
dynamic performance of the converter at 2.05V is more
severe than at a higher output voltage and therefore still
provides pertinent information.
Figure 3 shows that the output voltage remains well within
the 5% regulation window, even at the more stringent 2.05V
output. The additional margin allows for temperature, life,
and sample variations. Figure 4 details the positive edge of
the load transient application, but with different conditions.
The 0A to 14A load transient was applied with a Hewlett
Packard active load (HP6060B), which is limited to about
1A/ s slew rate. In this case, the output voltage is
programmed to a more typical value of 2.8V. The converter
performance is very similar for both test conditions. Since
the slew rate of the transient is slower in Figure 4, the output
voltage drops at a slower rate but the amount of the voltage
excursion is about the same. In addition to the output
voltage, Figure 4 shows the error amplifier output (COMP)
and the output inductor current (I
response of the error amplifier.
HIP6005EVAL3
The HIP6005EVAL3 is a standard Buck converter capable of
providing up to 14A of current at output voltages from 1.3V to
3.5V. The schematic and bill-of-materials for this design can
be found in the appendix. The HIP6005EVAL3 differs from
the HIP6004EVAL3 in three ways:
Efficiency
Figure 5 shows the efficiency data for the HIP6005EVAL3
under identical conditions as Figure 2 for the
HIP6004EVAL3. Comparing the two graphs reveals that the
Synchronous-Buck design is a little more efficient than the
Standard-Buck design over most of the load range.
2.85V
1. U1 is a HIP6005
2. CR3 replaces Q2 and CR2 is changed
3. L2 is a larger inductor
1.5V
0A
FIGURE 4. 0A TO 14A LOAD TRANSIENT RESPONSE
(1V/DIV)
COMP
5A/DIV
VOUT
(50mV/DIV)
I
L
TIME (50 s/DIV)
L
). Notice the rapid