ISL97656 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

MFG CO.

ISL97656

Step-Up Regulator with 4A Integrated Switch

Renesas Electronics 

ISL97656

Cascaded MOSFET Application

A 24V N-Channel MOSFET is integrated in the boost regulator. For

the applications where the output voltage is greater than 24V, an

external cascaded MOSFET is needed as shown in Figure 16. The

voltage rating of the external MOSFET should be greater than

VIN.

VIN

VOUT

INTERSIL

ISL97656

LX

FB

DC PATH BLOCK APPLICATION

There is a DC path in the boost converter from the input to the

output through the inductor and diode. In the non-synchronous

topology, although the system is still in shutdown mode, the

output voltage will be the input voltage minus the forward

voltage diode drop of the Schottky diode. If this voltage is not

desired, the following circuit (see Figure 17) can be used between

input and inductor to disconnect the DC path when the ISL97656

is in shutdown mode.

TO INDUCTOR

INPUT

EN

FIGURE 17. CIRCUIT TO DISCONNECT THE DC PATH OF BOOST

CONVERTER

FIGURE 16. CASCADED MOSFET TOPOLOGY FOR HIGH OUTPUT

VOLTAGE APPLICATIONS

© Copyright Intersil Americas LLC 2007-2012. All Rights Reserved.

All trademarks and registered trademarks are the property of their respective owners.

For additional products, see www.intersil.com/en/products.html

Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted

in the quality certifications found at www.intersil.com/en/support/qualandreliability.html

Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such

modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are

current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its

subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see www.intersil.com

FN6439 Rev 6.00

July 19, 2012

Page 8 of 9

Share Link: