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RT8239B Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8239B Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 24 page  RT8239A/B/C ® DS8239A/B/C-06 October 2012 www.richtek.com 1 Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © Ordering Information Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. High Efficiency, Main Power Supply Controller for Notebook Computers General Description 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. Features 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 Applications Notebook computers System Power Supplies 3- and 4- Cell Li+ Battery-Powered Device RT8239A/B/C Package Type QW : WQFN-20L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free) Pin Function With A : ENM B : SECFB C : SECFB, Ultrasonic Mode |
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