DC/DC Power Switching Regulator

The ISL8540 is a step down DC/DC power switching regulator which accepts 9.0V to 40V input and provides a 2A output current. The output voltage can be set in the range between 1.21V and 35V by means of an external divider. The device uses an internal power DMOS transistor with a typical rDS(ON) of 0.19Ω to obtain very high efficiency and high switching speed. A switching frequency in the range of 100kHz to 600kHz can be realized (the maximum power dissipation of the various packages must be observed).

Features
• Voltage feedforward mode
• Step down DC/DC supporting up to 2A
• Input voltage range of 9.0V to 40V
• Internal reference of 1.21V ±1%
• Adjustable output voltage range of 1.21V to 35V
• Adjustable switching frequency 100kHz to 600kHz
• Frequency SYNC pin
• Zero load current operation
• Pulse-by-pulse mode current limit and Hiccup mode
• Low standby current of 60µA typical
• Thermal shut-down
• Load dump to 100V for 400ms
• Pb-free (RoHS compliant)

Applications
• Non-isolated telecom power supply
• Industrial and automotive power supplies
• Portable computers
• Battery chargers
• Distributed power systems