The ISL8018 is a high efficiency, monolithic, synchronous

step-down DC/DC converter that can deliver up to 8A continuous

output current from a 2.7V to 5.5V input supply. The output

voltage is adjustable from 0.6V to VIN. With an adjustable current

limit, reverse current protection, prebias start and

over-temperature protection, the ISL8018 offers a highly robust

power solution. It uses current control architecture to deliver fast

transient response and excellent loop stability.

The ISL8018 integrates a pair of low ON-resistance P-channel

and N-channel internal MOSFETs to maximize efficiency and

minimize external component count. 100 duty-cycle operation

allows less than 250mV dropout at 8A output current. Adjustable

frequency and synchronization allow the ISL8018 to be used in

applications requiring low noise.

The ISL8018 can be configured for discontinuous or forced

continuous operation at light load. Forced continuous operation

reduces noise and RF interference while discontinuous mode

provides high efficiency by reducing switching losses at light loads.

The ISL8018 is offered in a space saving 20 Ld 3x4 QFN lead free

package with exposed pad lead frames for excellent thermal

performance. The complete converter occupies less than

96.8mm2 area.

Features

• High efficiency synchronous buck regulator with up to 97

efficiency

• ±10 output voltage margining

• Adjustable current limit

• Start-up with prebiased output

• Internal soft-start - 1ms or adjustable, internal/external

compensation

• Soft-stop output discharge during disabled

• Adjustable frequency from 500kHz to 4MHz - default at 1MHz

• External synchronization up to 4MHz - master to slave phase

shifting capability

• Peak current limiting, hiccup mode short-circuit protection and

over-temperature protection

Applications

• DC/DC POL modules

• µC/µP, FPGA and DSP power

• Plug-in DC/DC modules for routers and switchers

• Portable instruments

• Test and measurement systems

• Li-ion battery powered devices