SY6280AAAC

Application Note: SY6280/SY6280A 5.5V, 2A Low Loss Power Distribution Switch General Description Features SY6280/ SY6280A is ultra-low RDS(ON) switch with programmable current limit to protect the power source from over current and short circuit conditions. They incorporate over temperature protection and reverse blocking functions. SY6280 automatically discharges the output capacitors during shutdown. • • • • • • • • Ordering Information SY6280□(□□)□ fo Note ------- • USB 3G Datacard • USB Dongle • MiniPCI Accessories Figure 1. Schematic Diagram(1A current limit) Sil er gy Co rp .C on fid en Typical Applications Applications ar ed Package type SOT23-5 SOT23-5 tia l-P re p Ordering Number SY6280AAC SY6280AAAC r Temperature Code Package Code Optional Spec Code Input voltage: 2.4V to 5.5V 2A load current capability Programmable current limit Enable polarity: active high Over temperature protection Reverse blocking (no body diode) OUT can be forced higher than IN at shutdown Output discharge function SY6280: Auto output discharge function SY6280A: No output discharge function • Compact SOT23-5 package minimizes the board space SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 1 SY6280/SY6280A Pinout (top view) OUT 1 GND 2 ISET 3 5 IN 4 EN tia l-P re p Absolute Maximum Ratings (Note 1) ar ed fo r (SOT23-5) Top mark: COxyz for SY6280 (Device code: CO, x=year code, y=week code, z= lot number code) QWxyz for SY6280A (Device code: QW, x=year code, y=week code, z= lot number code) Pin Name Pin number Pin Description IN 5 Input pin, decoupled with a 10µF capacitor to GND GND 2 Ground pin OUT 1 Output pin, decoupled with a 10µF capacitor to GND EN 4 ON/OFF control. Pull high to enable IC. Do not leave it floating ISET 3 Current limit programming pin. Connect a resistor RSET from this pin to ground to program the current limit: ILIM (A)=6800/RSET (Ω) .C on fid en All pins------------------------------------------------------------------------------------------------------------------- -0.3V to 6V Power Dissipation, PD @ TA = 25°C SOT23-5, ---------------------------------------------------------------------------- 0.6W Package Thermal Resistance (Note 2) θ JA ---------------------------------------------------------------------------------------------------------------- 200°C/W θ JC ---------------------------------------------------------------------------------------------------------------- 130°C/W Junction Temperature--------------------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------ 260°C Storage Temperature Range ------------------------------------------------------------------------------------- -65°C to 150°C ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------------- 2kV MM (Machine Mode) ---------------------------------------------------------------------------------------------------------- 200V Co rp Recommended Operating Conditions (Note 3) Sil er gy IN------------------------------------------------------------------------------------------------------------------------ 2.4V to 5.5V All other pins ------------------------------------------------------------------------------------------------------------- 0V to 5.5V Junction Temperature Range ------------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------- -40°C to 85°C SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 2 SY6280/SY6280A ar ed (SY6280A) Sil er gy Co rp .C on fid en tia l-P re p (SY6280) fo r Block Diagram SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 3 SY6280/SY6280A Electrical Characteristics (VIN = 5V, COUT=10µ F, TA = 25°C unless otherwise specified) Test Conditions Min 2.4 Open load, IC Disabled. Open load, IC Enabled. Typ 0.2 38 63 Max 5.5 1 2 0.8 1 2.3 VEN=5.0V 0.75 RL=10Ω, COUT=1µF RL=10Ω, COUT=1µF SY6280 Only r RSET=6.8kΩ fo Turn-on Time Turn-off Time OUT Shutdown Discharge Resistance Thermal Shutdown Temperature Thermal Shutdown Hysteresis Symbol VIN ISHDN IQ RDS(ON) VEN(H) VEN(L) IEN VIN_UVLO VIN_HYS ILIM ILIM(min) TON TOFF RDIS TSD ar ed Parameter Input Voltage Range Shutdown Input Current Quiescent Supply Current FET RON EN Rising Threshold EN Falling Threshold EN Leakage Current IN UVLO Threshold IN UVLO Hysteresis Over Current Limit 0.1 1 0.4 130 20 120 130 20 1.25 Unit V µA µA mΩ V V µA V V A A µs µs Ω ℃ ℃ tia l-P re p Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. fid en 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. Pin 2 of SOT23-5 packages is the case position for θ JC measurement. Sil er gy Co rp .C on Note 3: The device is not guaranteed to function outside its operating conditions. SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 4 SY6280/SY6280A Sil er gy Co rp .C on fid en tia l-P re p ar ed fo r Typical Operating Characteristics SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 5 Sil er gy Co rp .C on fid en tia l-P re p ar ed fo r SY6280/SY6280A SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 6 SY6280/SY6280A Operation SY6280/A 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 ILIM (A)=6800 / Rset (Ω). The minimum current limit is 0.4A. Current limit beyond 2A is not recommended. Maximum input voltage consideration: For any application, input voltage for SY6280/A should not be allowed to exceed the maximum recommended value (5.5V). r 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 130°C, the switch will be shutdown. Once the junction temperature drops to 110°C, the part will restart. Current limit is programmable to protect the power source from over current and short circuit conditions. Connect a resistor RSET from ISET pin to GND to program the current limit: fo Below is a typical application circuit for SY6280/A. The front stage is a non-synchronous boost stage and the input power supply can be a battery or an adapter. Some adapters may have poor output voltage tolerance, or may have large output voltage overshoot if the adapter is hot plug in directly. The voltage overshoot higher than VIN( 5.5V) will significantly reduce the reliability of SY6280/A and may even lead to IC EOS failure. tia l-P re p 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 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. ar ed Supply Filter Capacitor Sil er gy Co rp .C on fid en Current Limiting Setting SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 7 SY6280/SY6280A PCB Layout Guide To achieve a better performance, the following guidelines must be strictly followed: Keep all power traces as short and wide as possible and use at least 2 ounce copper for all power traces. Place a ground plane under all circuitry to lower both resistance and inductance and improve DC and transient performance. Locate the output capacitors as close to the connectors as possible to lower the impedance (mainly inductance) between the port and the capacitor and improve transient performance. Input and output capacitors should be placed close to the IC and connected to the ground plane to reduce noise coupling. en tia l-P re p ar ed fo r Locate the ceramic bypass capacitors as close as possible to the IN pin and OUT pin of SY6280/A. Sil er gy Co rp .C on fid Top View: PCB Layout Guide(SOT23-5) SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 8 SY6280/SY6280A SOT23-5 Package outline & PCB layout design 0.55 1.50 - 1.70 ar ed 0.80 fo r 2.70 - 3.00 2.40 2.80 - 3.10 1.0 - 1.3 .C on fid en 0.01 - 0.1 0.25 REF 0.1 - 0.15 0.30 - 0.50 tia l-P re p 0.95 TYP Recommended Pad Layout 0.95 TYP 1.90 TYP Co rp 0.3 - 0.6 Sil er gy Notes: All dimensions are in millimeters. All dimensions don’t include mold flash & metal burr. SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 9 SY6280/SY6280A Taping & Reel Specification 1. Taping orientation SOT23-5 3.9/4.1 fo r 7.7/8.3 1.45/1.55 ar ed Feeding direction Feeding direction Package types Tape width (mm) Pocket pitch(mm) Reel size (Inch) Reel width(mm) Trailer length(mm) Leader length (mm) Qty per reel Sil er gy Co rp .C on fid en tia l-P re p 2. Carrier Tape & Reel specification for packages 8 4 7" 8.4 280 160 3000 SOT23-5 3. Others: NA SY6280/A Rev1.0C Silergy Corp. Confidential- Prepared for Customer Use Only 10