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2x RICHTEK RT8239B JC=CF JC=ED JC=IC JC=EA Power Controller
ITEM DESCRIPTION

High Efficiency, Main Power Supply Controller

The RT8239A/B/C is a dual step down, Switch Mode Power Supply (SMPS) controller which generates logic supply voltages for battery powered systems. It includes two Pulse Width Modulation (PWM) controllers adjustable from 2V to 5.5V and also two fixed 5V/3.3V linear regulators. One of the controllers (LDO5) provides automatic switch over to the BYP1 input connected to the main SMPS1 output for maximized efficiency. An optional external charge pump can be monitored through SECFB (RT8239B/C). Other features include on board power up sequencing, a power good output, internal soft-start, and a soft discharge output that prevents negative voltage during shutdown. A constant on-time PWM control scheme operates without sense resistors and assures fast load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, a diode emulation mode maximizes efficiency for light load applications. The SMPS1/SMPS2 switching frequency can be adjustable from 200kHz/233kHz to 400kHz/466kHz respectively. The RT8239A/B/C is available in a WQFN-20L 3×3 package, and operates over an extended temperature range from -40°C to 85°C.

All orders placed before 3pm will be dispatched within same working day.
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ChipBay is a UK-based PCB components, genuine computer parts and accessories retailer established in 2010. With long years of experience we have contacts in the industry with complementary skills enabling us to further increase our resources on regular basis. We care about our trademark that is why the producs that we sell are the highest quality which can be sourced from around the world.

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