The ISL8009A is a high efficiency, monolithic, synchronousstep-down DC/DC regulator that can deliver up to 1.5Acontinuous output current. It is optimized for generating lowoutput voltages down to 0.8V. The supply voltage range of2.7V to 5.5V, allows the use of single Li+cell, three NiMHcells or a regulated 5V input. The ISL8009A uses currentmode control architecture to deliver very low duty cycleoperation at high frequency with fast transient response andexcellent loop stability. It has flexible operation modeselection of forced PWM mode and automatic PFM/PWMwith as low as 17μA quiescent current, achieving high powerconversion efficiency under light load condition, hencemaximizing battery life. High 1.6MHz pulse-width modulation(PWM) switching frequency allows the use of small externalcomponents.The ISL8009A integrates a pair of low ON-resistanceP-Channel and N-Channel internal MOSFETs to maximizeefficiency and minimize external component count. The100% duty-cycle operation allows less than 400mV dropoutvoltage at 1.5A output current.The ISL8009A offers a 2ms Power-On-Reset (POR) timer atpower-up. The timer output can be reset by RSI. Whenshutdown, ISL8009A discharges the output capacitorthrough a 100Ω resistor. Other features include internaldigital soft-start, enable for power sequence, overcurrentprotection, and thermal shutdown.The ISL8009A is offered in a 2mmx3mm 8 Ld DFN packagewith 1mm maximum height. The complete converteroccupies less than 1cm2 area.
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