Automotive DC/DC Regulator

Date
08/16/2011

Categories:
DC-DC Converters

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Developed for broad range of secondary power automotive applications including infotainment, camera and system modules

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Intersil Corporation has developed an AEC-Q100 qualified version of the ISL8088 - an industry-leading, high efficiency, dual synchronous step-down DC/DC regulator. The ISL78228 is designed to provide regulated power for use in remote safety cameras, infotainment systems, control modules and many other space-constrained automotive applications. The device delivers up to 800mA continuous current from each of its two independent outputs. Its 2.75V to 5.5V input voltage range permits powering from common 3.3V and 5.0V 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 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 30?A, hence enabling high light load efficiency in order to maximize battery life. The device operates at 2.25MHz switching frequency (and can be synchronized up to 4MHz) allowing the use of small, low cost inductors and capacitors. Each channel is optimized for generating an output voltage as low as 0.6V. It also features an integrated 2ms 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. Its low 30uA quiescent current also 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 has built-in thermal protection. When the internal temperature reaches +150°C, the regulator is completely shut down. As the temperature drops to +130°C, the ISL78228 resumes operation by stepping through a soft-start-up. The ISL78228 is available now in a compact 3mm x 3mm 10-pin DFN package with 0.9mm maximum height. Qualified operating temperature range is for the ISL78228 is -40 to 105°C. Prices start at $0.99 each in 50k quantities. www.intersil.com

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