ISL1591

17

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FN7625.1

October 31, 2012

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this extreme condition would normally not be encountered, it

does show the importance of knowing your minimum expected

load for high output swing conditions.

Board Design Recommendations

Close placement of the supply decoupling capacitors will

minimize parasitic inductance in the supply path. High frequency

load currents are typically pulled through these capacitors so

close placement of 0.01µF capacitors on each of the supply pins

will improve dynamic performance. Higher valued capacitors,

6.8µF typically, can be placed further from the package as they

are providing more of the low frequency decoupling.

The thermal pad for the ISL1591 should be connected to either

depends on which one would have the more accessible thermal

area.

While the ISL1591 is relatively robust in driving parasitic

capacitive loads, it is always preferred to get any series output

resistor needed in the design as physically close as possible to

the output pins. Then trace capacitance on the other side of that

resistor will have a much smaller effect on loop phase margin.

Protection devices that are intended to steer large load

transients away from the ISL1591 output stage and into the

power supplies or ground should have a short trace from their

supply connections into the nearest supply capacitor - or should

include their own supply capacitors to provide a low impedance

path under fast transient conditions.

Products

Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products

address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks.

Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a

complete list of Intersil product families.

For a complete listing of Applications, Related Documentation and Related Parts, please see the respective product information page.

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Revision History

The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make

sure you have the latest revision.

DATE

REVISION

CHANGE

10/30/2012

FN7625.1

page 2 , Figure 3 schematic: added resistor values and added buffer between Rc and Rt.

08/18/2011

FN7625.0

Initial Release