DATASHEET
ISL8022 FN7650
Rev 3.00
March 14, 2013 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 180В° 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. Features The ISL8022 has a user configurable mode of operation-forced
PWM mode and PFM/PWM mode. The forced PWM mode
operation reduces noise and RF interference while the PFM
mode operation provides high efficiency by reducing switching
losses at light loads. In PFM mode of operation, both channels
draw a total quiescent current of only 40ВµA, hence enabling
high light load efficiency in order to maximize battery life. Internal current mode compensation Dual 2A/1.7A high efficiency synchronous buck regulator
with up to 97% efficiency, low iq (40ВµA) 180В° 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 Peak current limiting, hiccup mode short circuit protection …
