1
®
AN1482.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL9440CEVAL1Z: Triple PWM Step-Down
Synchronous Buck Controller and One LDO
ISL9440CEVAL1Z Evaluation Board
The ISL9440CEVAL1Z evaluation board features the
ISL9440C. The ISL9440C is quad-output controller that
integrates three PWM synchronous buck controllers and one
low-dropout linear regulator controller. The ISL9440C offers
programmable soft-start, independent enable functions and
integrates OV/OC/OT protection. The current mode control
architecture and internal compensation network keep
peripheral component counts minimized. 600kHz switching
frequency can minimize inductor size while the strong gate
driver is able to deliver 12A to each PWM channel.
Table 1 shows the difference in terms of ISL944xx family
features.
The ISL9440CEVAL1Z is easy to set up to evaluate the
performance of the ISL9440C. Please refer to the “Electrical
Specifications” 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. ISL9440CEVAL1Z EVALUATION BOARD
Application Note
June 30, 2009
