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ISL78228 Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

13th December 2011

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Datasheet

The ISL78228 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 for the use of a 3.3V or 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 ISL78228 operates above the AM radio band as well as the 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.

The ISL78228 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 30μA, hence enabling high light load efficiency in order to maximize battery life.

The ISL78228 offers a 1ms Power-Good (PG) to monitor both outputs at power-up. When shutdown, ISL78228 discharges the outputs capacitor. Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal shutdown. The ISL78228 is offered in a 3mmx3mm 10 Ld DFN package with 1mm maximum height. The complete converter occupies less than 1.8cm2 area.

The ISL78228 is both AEC - Q100 rated and fully TS16949 compliant. The ISL78228 is rated for the automotive temperature range (-40°C to +105°C).

Key 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
TS16949 Compliant
AEC - Q100 Tested
Pb-free (RoHS Compliant)