Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

The ISL8022 is a high efficiency, dual synchronous step-down DC/DC regulator that can deliver up to 2A/1.7A continuous output current per channel. The channels are 180° out-ofphase for input RMS current and EMI reduction. The supply voltage range of 2.8V to 5.5V allows for the use of a single Li+ cell, three NiMH cells or a regulated 5V input. The current mode control architecture enables very low duty cycle operation at high frequency with fast transient response and excellent loop stability. The ISL8022 operates at 2.25MHz switching frequency allowing for the use of small, low cost inductors and capacitors. Each channel is optimized for generating an output voltage as low as 0.6V.

特性 Features

? Dual 2A/1.7A high efficiency synchronous buck regulator with up to 97 efficiency, low iq (40μA)

? 180° out-of-phase

? Start-up with pre-biased output

? Selectable forced PWM mode and PFM mode

? External synchronization up to 8MHz

? Negative current detection and protection

? 100 maximum duty cycle for lowest dropout

? Internal current mode compensation

? Peak current limiting, hiccup mode short circuit protection and over-temperature protection

? Pb-free (RoHs compliant)

Applications

? DC/DC POL modules

? μC/μP, FPGA and DSP power

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

? Test and measurement systems

? Li-ion battery powered devices

? Bar code readers