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Notebook computers
Notebook computers
System Power Supplies
3- and 4- Cell Li+ Battery-Powered Device
5.5V to 25V Input Voltage Range
5.5V to 25V Input Voltage Range
2V to 5.5V Output Voltage Range
No Current Sense Resistor Needed
5V/3.3V Linear Regulators
4700ppm/°C RDS(ON) Current Sensing
Internal Current Limit Soft-Start and Soft Discharge Output
Built In OVP/UVP/OCP
Selectable Operation Mode with Switcher Enable Control (RT8239A)
SECFB Input Maintains Charge Pump Voltage (RT8239B/C)
Power Good Indicator (RT8239B/C includes SECFB)
RoHS Compliant and Halogen Free
High Efficiency, Main Power Supply Controller for Notebook Computers
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 3x3 package, and operates over an ,extended temperature range from -40°C to 85°C.
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