The device delivers up to 800 mA continuous current from each of its two independent outputs. Its 2.75 V to 5.5 V input voltage range permits powering from common 3.3 V and 5.0 V automotive supplies. The internal current-mode compensation provides fast transient response and allows for 100% duty cycle operation for low dropout. This also simplifies circuit design by eliminating the need for external compensation components.
The ISL78228 operates at 2.25 MHz switching frequency (and can be synchronized up to 4 MHz) allowing the use of small, low cost inductors and capacitors. Each channel is optimized for generating an output voltage as low as 0.6 V. The device also features an integrated 2 ms digital soft start and Power Good output. The enable pin facilitates power sequencing and the soft-stop function ensures output capacitors are discharged when switching to shutdown. The device's low 30 uA quiescent current minimizes standby power consumption. The compact package and high (>90%) efficiency makes the ISL78228 an ideal design choice for in-car ultra-compact regulated power applications.
The ISL78228 is available now in a compact 3 mm x 3 mm 10-pin DFN package with 0.9 mm maximum height. Qualified operating temperature range is for the ISL78228 is -40 to 105°C. Prices start at $0.99 each in 50k quantities.
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