ISL8540 Datasheet - Intersil Corporation

ISL8540 DC/DC Power Switching Regulator

VIN (Pins 1, 2, 19, 20) The input supply for the PWM regulator power stage. Connected to DRAIN of the high side MOSFET. RTCT (Pin 9) A resistor to VIN and a capacitor to GND determine the frequency of the saw-tooth oscillator. Resistor range is R = 20k to 100k. Capacitor range is C = 470pF to 1.2n.

® ISL8540 Data Sheet September 9, 2008 FN6495.5 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 c.

ISL8540 Features

* of this next generation of DC/DC converter include pulse-by-pulse current limit for FET protection, hiccup mode for short circuit protection, voltage feedforward regulation, Frequency SYNC, soft-start, low standby current of 60µA typical in the disabled state, and thermal shut-down. The device is av

ISL8540_IntersilCorporation.pdf