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