Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

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.

Features

• 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

• Power-Good (PG) Output with 1ms Delay

Applications*(see page 17)

• 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 Power Devices

• Bar Code Readers