HIP1011ACB datasheet(9/11 Pages) RENESAS

9 / 11 page

HIP1011A

FN4631 Rev 5.00

Page 9 of 11

November 16, 2004

ARE THERE PCB LAYOUT DESIGN BEST PRACTICES

TO FOLLOW? WHAT ARE THEY?

As with most innovative ICs performing critical tasks there

are crucial PCB layout best practices to follow for optimal

performance. PCB traces that connect each end of the

current sense resistors to the HIP1011A must not carry any

load current. This can be accomplished by two dedicated

PCB traces directly from the sense resistor to the HIP1011A,

see examples of correct and incorrect layouts in Figure 13.

Typical Applications: HIP1011A PCI Hot

Plug Controller

Introduction to HIP1011A and PCI Hot Plug

Evaluation Board

The HIP1011A is compatible with the PCI Hot Plug

specification as it is derived from the widely used HIP1011.

This device facilitates “HOT PLUGGING”, the removal or

insertion of PCI compliant cards without the need to power

down the server voltage bus. The HIP1011A controls all

four, -12V, +12V, +3.3V, +5V supplies found in PCI

applications, monitoring and protecting all against over

current (OC) and the +12V, +3.3V, +5V for under voltage

(UV) conditions. Reference the PCI Hot Plug specification

available from www.pcisig.com.

Figure 14 illustrates the PCB pattern for implementation of

the HIP1011A with 4 power MOSFETs. Additional

components for optimizing performance in particular

applications, ambient electrical noise levels or desired

features will be necessary. The ease of implementation of

the HIP1011A and MOSFETs is complemented by the small

PCB foot print necessary, since both are available in 0.150

inch SOICs. The typical application requires only 1.1 square

inches of PCB board space.

IS THERE A HIP1011A PCI HOT PLUG EVALUATION

BOARD AVAILABLE?

There is an evaluation board available through your local

Intersil sales office. The HIP1011AEVAL1 board (Figure 15)

is a simple board designed to demonstrate and evaluate the

HIP1011A using an external PWRON signal simulating a

PCI Hot Plug environment. The HIP1011AEVAL1 board

comes in 2 parts, the mother board with the HIP1011A,

MOSFETs with external components and a load board

simulating a ‘typical’ PCI load with adequate space for

modifying the existing load or to add an electronic load. Even

with a number of available test points the HIP1011A

implementation space is still very efficient. In addition, the

demo board offers adequate space to evaluate the

application note discussions found in AN9737.

CORRECT

TO HIP1011A

VS AND VISEN

TO HIP1011A

VS AND VISEN

CURRENT

SENSE RESISTOR

INCORRECT

FIGURE 13. SENSE RESISTOR LAYOUT

FIGURE 14. LAYOUT PLOT, ACTUAL SIZE (0.75in x 1.5in)

1.5in

0.75in

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