2

AN1551.0

March 5, 2010

What’s Inside

The Evaluation Board Kit contains the following

materials:

• The ISL9440AEVAL1Z

• The ISL9440, ISL9440A, ISL9441 datasheet FN6383

• This Evaluation Board Kit document (AN1551)

Recommended Equipment

The following materials are recommended to perform

testing:

• 0V to 20V Power Supply with at least 10A source

current capability

• Three electronic loads capable of sinking current up

to 7A

• Digital Multimeters (DMMs)

• 100MHz Quad-Trace Oscilloscope

• Signal Generator (for load transient tests)

Quick Test Guide

1. Ensure that the circuit is correctly connected to the

supply and electronic loads prior to applying any

power. Please refer to Figure 2 for proper set-up.

3. Turn on the power supply.

and observe output voltage. The output voltage

variation should be within 3%.

5. Adjust load current within the specified range and

observe output voltage. The output voltage

variation should be within 3%.

6. Use oscilloscope to observe output voltage ripple

and phase node ringing. For accurate measurement,

refer to Figure 3 for proper test set-up.

page 7 and “Typical Evaluation Board Performance Curves” on page 4.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

All outputs are in regulation

6.0

12

16

V

0.97

1.00

1.03

V

3.25

3.32

3.4

V

4.85

5.0

5.15

V

2.43

2.50

2.57

V

PWM1 Rated Current

three PWM outputs are fully loaded

67

A

PWM2 Rated Current

67

A

PWM3 Rated Current

45

A

LDO Rated Current

0.8

1.0

A

oscilloscope is with full bandwidth

19.4

36.6

32.2

Application Note 1551