DATASHEET
ISL8088 FN6858
Rev 2.00
May 26, 2011 Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck
Regulator Features The ISL8088 is a high efficiency, dual synchronous step-down
DC/DC regulator that can deliver up to 800mA continuous
output current per channel. The supply voltage range of 2.75V
to 5.5V allows 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
ISL8088 operates at 2.25MHz switching frequency allowing
the use of small, low cost inductors and capacitors. Each
channel is optimized for generating an output voltage as low
as 0.6V. Internal Current Mode Compensation 100% Maximum Duty Cycle for Lowest Dropout Selectable Forced PWM Mode and PFM Mode External Synchronization up to 4MHz Start-up with Pre-biased Output Soft-Stop Output Discharge During Disabled Internal Digital Soft-Start -2ms The ISL8088 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 30ВµA hence enabling
high light load efficiency in order to maximize battery life. Power-Good (PG) Output with 1ms Delay Applications DC/DC POL Modules ВµC/ВµP, FPGA and DSP Power Plug-in DC/DC Modules for Routers and Switchers The ISL8088 offers a 1ms Power-Good (PG) to monitor both
output at power-up. When shutdown, ISL8088 discharges the
outputs capacitor. Other features include internal digital softstart, enable for power sequence, overcurrent protection, and …
