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 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 AEC-Q100 rated. The ISL78228 is rated for

the automotive temperature range (-40°C to +105°C).

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

• AEC-Q100 tested

• Pb-free (RoHS compliant)

Applications

• DC/DC POL modules

• µC/µP, FPGA and DSP power

• Rear camera systems

• Navigation systems

• Infotainment systems