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RT9287A-FQPQW Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9287A-FQPQW Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 14 page  RT9287A Preliminary 1 DS9287A-00 July 2007 www.richtek.com Ordering Information Boost Converter for WLED Power with Dual LDO (TOP VIEW) WDFN-12L 3x3 Pin Configurations General Description The RT9287A is an integrated solution for WLED and camera power. It contains a boost converter with internal schottky diode to provide WLED power and Dual LDO for the power of camera image sensor. In the section of boost converter, RT9287A's optimized operation frequency can meet the requirement of small LC filters value and low operation current with high efficiency. Internal soft start function can reduce the inrush current. The initial current of WLED is set by the external resistor RSET. The feedback voltage is 250mV. In the section of DLDO, RT9287A is a dual channel, low noise, and low dropout regulator sourcing up to 300mA at each channel. The part offers 2% accuracy, low dropout voltage (240mV@300mA), and low ground current, only 27 μA per LDO. The shutdown current is near zero current, which is suitable for battery-power devices. Other features include current limiting, over temperature, output short circuit protection. The part is short circuit thermal folded back protected. RT9287A lowers its OTP trip point from 165 °C to 110°C when output short circuit occurs (VOUT < 0.4V) providing maximum safety to end users. RT9287A is available in a WDFN-12L 3x3 package. RT9287A- Package Type QW : WDFN-12L 3x3 (W-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) LDO Output Voltage : VOUT1/VOUT2 MG : 2.8V/1.8V FQ : 1.5V/3.1V Features Boost Converter VIN Operating Range : 2.7V to 5.5V Up to 85% Efficiency 22V Internal Power N-MOSFET 1MHz Switching Frequency Built-in Diode Digital Dimming with Zero-Inrush Input UVLO Protection Output Over Voltage Protection Internal Soft Start and Compensation Dual LDO Wide Operating Voltage Ranges : 2.7V to 5.5V Low-Noise for RF Application No Noise Bypass Capacitor Required Fast Response in Line/Load Transient TTL-Logic-Controlled Shutdown Input Low Temperature Coefficient Dual LDO Outputs (300mA/300mA) Ultra-Low Quiescent Current 27 μμμμμA/LDO High Output Accuracy 2% Short Circuit Protection Thermal Shutdown Protection Current Limit Protection Short Circuit Thermal Folded Back Protection RoHS Compliant and 100% Lead (Pb)-Free Applications Cellular Phones WLEDDriver PDAs and Smart Phones Probable Instruments VIN EN1 PGND LX VLDO1 VLDO2 AGND VDD FB EN2 VOUT ENB 11 10 9 1 2 3 4 5 12 67 8 GND Note : RichTek Pb-free and Green 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. 100% matte tin (Sn) plating. |
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