RT9702/A 80m, 500mA/1.1A High Side Power Switches with Flag General Description Features zz z zz Compliant to USB Specifications The RT9702 and RT9702A are cost-effective, low voltage, zz z zz Built-In (Typically 80m) N-Channel MOSFET single N-Channel MOSFET high-side power switches, zz z zz Output Can Be Forced Higher Than Input (Off-State) optimized for self-powered and bus- powered Universal zz z zz Low Supply Current : Serial Bus (USB) applications. The RT9702/A equipped 25uA Typical at Switch On State with a charge pump circuitry to drive the internal MOSFET 1uA Typical at Switch Off State switch the switch s low R , 80m, meets USB DS(ON) zz z zz Guaranteed 500mA/RT9702 and 1.1A/RT9702A voltage drop requirements and a flag output is available Continuous Load Current to indicate fault conditions to the local USB controller. zz z zz Wide Input Voltage Ranges : 2V to 5.5V Additional features include soft-start to limit inrush current zz z zz Open-Drain Fault Flag Output during plug-in, thermal shutdown to prevent catastrophic zz z zz Hot Plug-In Application (Soft-Start) switch failure from high current loads, under-voltage zz z zz 1.7V Typical Under Voltage Lockout (UVLO) lockout (UVLO) to ensure that the device remains off zz z zz Current Limiting Protection unless there is a valid input voltage present, fault current zz z zz Thermal Shutdown Protection is limited to typically 800mA for RT9702 in single port and zz z zz Reverse Current Flow Blocking (no body diode) 1.5A for RT9702A in dual ports in accordance with the zz z zz Smallest SOT-23-5 and TSOT-23-5 Packages USB power requirements, lower quiescent current as 25A Minimizes Board Space making this device ideal for portable battery-operated zz z zz UL ApprovedE219878 equipment. zz z zz TUV IEC60950-1 : 2005 Certified The RT9702/A is available in SOT-23-5 and TSOT-23-5 zz z zz RoHS Compliant and 100% Lead (Pb)-Free packages requiring minimum board space and smallest components. Applications z USB Bus/Self Powered Hubs Ordering Information z USB Peripherals RT9702/A z ACPI Power Distribution Package Type z PC Card Hot Swap B : SOT-23-5 z Notebook, Motherboard PCs J5 : TSOT-23-5 z Battery-Powered Equipment Lead Plating System P : Pb Free z Hot-Plug Power Supplies G : Green (Halogen Free and Pb Free) z Battery-Charger Circuits 1.1A Output Current 500mA Output Current Marking Information Note : For marking information, contact our sales representative Richtek products are : directly or through a Richtek distributor located in your RoHS compliant and compatible with the current require- area. ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. DS9702/A-15 April 2011 www.richtek.com 1+ RT9702/A Pin Configurations Functional Pin Description Pin Name Pin Function (TOP VIEW) VIN Power Input Voltage VOUT VIN VOUT Output Voltage 5 4 GND Ground 23 EN Chip Enable (Active High) EN GND FLG FLG Open-Drain Fault Flag Output SOT-23-5/TSOT-23-5 Typical Application Circuit Pull-Up Resistor (10k to 100k) (Optional) Flag Transient Filtering) USB Controller Supply Voltage 5V 10k Over -Current VIN FLG 0.1F 1F RT9702/A VOUT V BUS Chip Enable EN D+ GND 10F 150F D- GND Ferrite Beades Data Note: A low-ESR 150F aluminum electrolytic or tantalum between V and GND is strongly recommended to meet the OUT 330mV maximum droop requirement in the hub V . (see Application Information Section for further details) BUS Function Block Diagram VIN EN Bias UVLO Current Limiting Gate Charge Oscillator Control Pump Output Voltage VOUT Detection Thermal Protection FLG Delay GND www.richtek.com DS9702/A-15 April 2011 2