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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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Application Note 1551

ISL9440AEVAL1Z: Triple PWM Step-Down

Synchronous Buck Controller and One LDO

ISL9440AEVAL1Z Evaluation

Board

The ISL9440AEVAL1Z evaluation board features the

ISL9440A. The ISL9440A is a a quad-output controller

that integrates three PWM synchronous buck controllers

and one low-dropout linear regulator controller. The

ISL9440A offers internal soft-start, independent enable

functions and integrates UV/OV/OC/OT protection. Its

current mode control architecture and internal

compensation network keep peripheral component

count minimal. Switching frequency of 600kHz

minimizes inductor size while the strong gate drivers

deliver up to 12A to each PWM channel.

Table 1 shows the difference in terms of ISL944xx family

features.

The ISL9440AEVAL1Z is easy to set up to evaluate the

performance of the ISL9440A. Please refer to the

“Electrical Specifications” table on page 2 for typical

performance summary.

TABLE 1. FEATURES OF ISL944xx FAMILY

PART

NUMBER

EARLY

WARNING

SWITCHING

FREQUENCY

(kHz)

SOFT-STARTING

TIME

(ms)

ISL9440

Yes

300

1.7

ISL9440A

Yes

600

1.7

ISL9441

No

300

1.7

ISL9440B

Yes

300

Programmable

ISL9440C

Yes

600

Programmable

FIGURE 1. ISL9440AEVAL1Z EVALUATION BOARD

March 5, 2010

AN1551.0