ISL8540 Data Sheet September 9, 2008 FN6495.5 DC/DC Power Switching Regulator Features The ISL8540 is a step down DC/DC power switching Voltage feedforward mode regulator which accepts 9.0V to 40V input and provides a 2A Step down DC/DC supporting up to 2A output current. The output voltage can be set in the range Input voltage range of 9.0V to 40V between 1.21V and 35V by means of an external divider. The device uses an internal power DMOS transistor with a Internal reference of 1.21V 1% typical r of 0.19 to obtain very high efficiency and DS(ON) Adjustable output voltage range of 1.21V to 35V high switching speed. A switching frequency in the range of 100kHz to 600kHz can be realized (the maximum power Adjustable switching frequency 100kHz to 600kHz dissipation of the various packages must be observed). Frequency SYNC pin Notable features of this next generation of DC/DC converter include pulse-by-pulse current limit for FET protection, Zero load current operation hiccup mode for short circuit protection, voltage feedforward Pulse-by-pulse mode current limit and Hiccup mode regulation, Frequency SYNC, soft-start, low standby current Low standby current of 60A typical of 60A typical in the disabled state, and thermal shut-down. The device is available in a 20 Ld HTSSOP package. Thermal shut-down Load dump to 100V for 400ms Ordering Information Pb-free (RoHS compliant) PART TEMP. NUMBER PART RANGE PACKAGE PKG. Applications (Note) MARKING (C) (Pb-Free) DWG. ISL8540IVEZ ISL85 40IVEZ -40 to +85 20 Ld HTSSOP MDP0048 Non-isolated telecom power supply ISL8540IVEZ-T* ISL85 40IVEZ -40 to +85 20 Ld HTSSOP MDP0048 Industrial and automotive power supplies *Please refer to TB347 for details on reel specifications. Portable computers NOTE: These Intersil Pb-free plastic packaged products employ Battery chargers special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is Distributed power systems RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free Related Literature peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Technical Brief TB363 Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs) Pinout ISL8540 (20 LD HTSSOP) TOP VIEW VIN VIN 1 20 VIN VIN 2 19 LX 3 18 LX LX 4 17 LX BOOT 5 SS 16 EN 6 15 PGND VCC5 14 PGOOD 7 SYNC 8 13 REF RTCT 9 12 COMP 10 11 FB SGND CAUTION: These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1 1-888-INTERSIL or 1-888-468-3774 Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2007, 2008. All Rights Reserved All other trademarks mentioned are the property of their respective owners.ISL8540 Absolute Maximum Ratings Thermal Information Input Voltage VIN . GND -0.3V to 42V Thermal Resistance (Typical, Notes 1, 2) (C/W) (C/W) JA JC Voltage at BOOT pin GND -0.3V to 49V HTSSOP Package 40 2.5 LX, RTCT . GND -0.3V to 42V Maximum Power Dissipation 3W REF, FB, SS, EN, SYNC, PGOOD pins .8V Maximum Junction Temperature (Hermetic Package or Die) +150C VCC5* . GND -0.3V to 5.5V Maximum Junction Temperature (Plastic Package) . +150C Maximum Storage Temperature Range -65C to +150C Recommended Operating Conditions Pb-Free Reflow Profile .see link below