SY6283DRC

Application Note: SY6283/SY6283A Low Loss Power Distribution Load Switch 3A continuous, 4A peak current Advanced Design Specification Features General Description SY6283 and SY6283A are ultra-low RDS(ON) switch with current limiting function to protect the power source from over current and short circuit conditions. Ordering Information SY6283 □(□□)□ Temperature Code Package Code Optional Spec Code Temperature Range: -40°C to 85°C Ordering Number Package type Note SY6283DRC DFN1.2×1.6-4 3A/Active High SY6283ADRC DFN1.2×1.6-4 3A/Active High • • • • • • • • Distribution voltages: 2.5V to 5.5V Over temperature shutdown and automatic retry Reverse blocking (no body diode) At shutdown, OUT can be forced higher than IN Built-in softstart Output discharge function SY6283: No output discharge function SY6283A: Auto output discharge function RoHS Compliant and Halogen Free Compact packages minimize board space: DFN1.2x1.6-4 Typical Application Circuit Figure 1. Schematic Diagram AN_SY6283/A Rev. 0.1A Figure 2. Typical Perform Characteristic Silergy Corp. Confidential-prepared for Customer Use Only 1 AN_SY6283/SY6283A Pin Configurations (Top View) DFN1.2×1.6-4 Top mark: LPxyz for SY6283(Device code: LP, x=year code, y=week code, z= lot number code) MWxyz for SY6283A(Device code: MW, x=year code, y=week code, z= lot number code) Functional Pin Description Pin Name IN Pin number 3 GND OUT EN 1 4 2 Pin Description Input pin. Decouple this pin to GND with 4.7uF input Capacitor. Ground pin. Output pin. ON/OFF control. Do not leave it float. Absolute Maximum Ratings (Note 1) All pins-------------------------- ------------------------------------------------------------------------------------------------ 6V Power Dissipation, PD @ TA = 25°C DFN1.2×1.6-4----------------------------------------------------------------------0.5W Package Thermal Resistance (Note 2) θ JA --------------------------------------------------------------------------------------------------------------200°C/W θ JC ---------------------------------------------------------------------------------------------------------------70°C/W Junction Temperature Range --------------------------------------------------------------------------------- -40°C to 125°C Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------------260°C Storage Temperature Range ----------------------------------------------------------------------------------- -65°C to 150°C Recommended Operating Conditions (Note 3) IN---------------------------------------------------------------------------------------------------------------------- 2.5V to 5.5V EN-------------------------------------------------------------------------------------------------------------- -0.3V to VIN+0.3V All other pins --------------------------------------------------------------------------------------------------------------- 0-5.5V Junction Temperature Range ---------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range ----------------------------------------------------------------------------------- -40°C to 85°C AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 2 AN_SY6283/SY6283A Electrical Characteristics (VIN = 5V, CL=1uF, per channel, TA = 25°C unless otherwise specified) Parameter Input Voltage Range Shutdown Input Current Quiescent Supply Current FET RON Current Limit EN Threshold IN UVLO Threshold IN UVLO Hysteresis Rising Time Thermal Shutdown Temperature Thermal Shutdown Hysteresis Output Discharge Resistor Symbol VIN ISHDN IQ RDS(ON) ILIM VIH VIN,UVLO VIN,HYS tRising TSD RDSC Test Conditions Min 2.5 Output grounded, switch off Open load, switch on 3.0 2 Typ 0.1 32 60 3.85 Max 5.5 1 Unit V µA µA mΩ A V V V ms °C °C Ω 4.7 2.4 RL=5 Ω, CL=1uF SY6283A 0.1 0.75 150 20 10 Note 1: Stresses beyond “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 3: The device is not guaranteed to function outside its operating conditions AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 3 AN_SY6283/SY6283A Typical Operating Characteristics AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 4 Fall Time (us) AN_SY6283/SY6283A AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 5 AN_SY6283/SY6283A Block diagram (SY6283) (SY6283A) AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 6 AN_SY6283/SY6283A Operation SY6283 is a current limited P-channel MOSFET power switch with over current and over temperature protections. There is no body diode across the drain and the source of the MOSFET. It prevents the current flow from the output to the input after the chip is disabled. Over-current protection When the over-current condition is detected, the switch is regulated to achieve constant output current. If the over current condition lasts for a long time, and results in a junction temperature over 150°C, the switch will be shutdown. Once the junction temperature drops to 130°C, the part will restart. Supply Filter Capacitor In order to prevent the input voltage from dropping during hot-plug condition, a 10µF ceramic capacitor from VIN to GND is strongly recommended. However, higher capacitance could help to reduce the voltage drop. Furthermore, an output short will cause ringing on the input without the input capacitor. It could destroy the internal circuitry when the input transient voltage exceeds the absolute maximum supply voltage even for a short duration. PCB Layout Guide For best performance of the SY6283 , the following guidelines must be strictly followed: GND GND Keep all VBUS traces as short and wide as possible and use at least 2 ounce copper for all VBUS traces. Place a ground plane under all circuitry to lower both resistance and inductance and improve DC and transient performance. A low-ESR 150uF aluminum electrolytic or tantalum capacitor between VOUT and GND is strongly recommended. Locate the output capacitor as close to the connectors as possible to lower impedance(mainly inductance) between the port and the capacitor and improve transient performance. CIN VIN COUT VOUT Input and output capacitors should be placed closed to the IC and connected to ground plane to reduce noise coupling. Locate the ceramic bypass capacitors as close as possible to the VIN pins and VOUT pins of SY6283. AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 7 AN_SY6283/SY6283A PCB Layout Guide PCB Top Over Layer PCB Bottom Layer PCB Top Layer AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 8 AN_SY6283/SY6283A DFN1.2x1.6-4L FC Package Outline Top View Bottom View Side View Notes: All dimension in MM and exclude mold flash & metal burr. AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 9 AN_SY6283/SY6283A Taping & Reel Specification 1. DFN3x3-10 taping orientation Feeding direction 2. Carrier Tape & Reel specification for packages Reel Width Reel Size Package types Tape width (mm) Pocket pitch(mm) Reel size (Inch) Reel width(mm) Trailer length(mm) Leader length (mm) Qty per reel DFN1.2x1.6 8 4 7" 8.4 400 160 3000 3. Others: NA AN_SY6283/A Rev. 0.1A Silergy Corp. Confidential-prepared for Customer Use Only 10