(R) Preliminary SP2525A USB High-Side Power Switch FEATURES +3.0V to +5.5V Input Voltage Range 500mA Continuous Load Current per Channel 2.6V Undervoltage Lockout 1.25A Short Circuit Current Limit 100m Maximum On-Resistance 75A On-State Supply Current 1A Shutdown Current Output can be Forced Higher than Input (Off-State) Thermal Shutdown Slow Turn On and Fast Turn Off EN 1 FLG 2 8 OUT SP2525A 8 Pin NSIOC GND 3 7 IN 6 OUT 5 IN NC 4 Now Available in Lead Free Packaging Active-High Version: SP2525A-1 Active-Low Version: SP2525A-2 APPLICATIONS USB Power Management Hot Plug-In Power Supplies Battery Charger Circuit DESCRIPTION The SP2525A device is an integrated high-side power switch for self-powered ideal for selfpowered and bus-powered Universal Serial Bus (USB) applications. The high-side switches are MOSFET with 70m RDS(ON), which meets USB voltage drop requirements for maximum transmission wire length. Multi-purpose open-drain fault flag output indicates overcurrent limiting, thermal shutdown, or undervoltage lockout for each channel. Output current is typically limited to 0.85A below the 5A safety requirement, and the thermal shutdown functions shuts the switch off to prevent damage under overcurrent condition. Guaranteed minimum output rise time limits inrush current during hot plug-in, minimizing EMI and preventing the voltage at upstream port from dropping excessively. TYPICAL APPLICATION CIRCUIT VCC 5.0V 33F 10K 4.50V TO 5.25V UPSTREAM VBUS 100mA MAX USB CONTROLLER SPX1521 VBUS D+ D- FLG D+ + GND GND 10F Cout DATA Ferrite Bead IN + GND VBUS OUT SP2525A OVERCURRENT + 1F Cin (R) EN ON/OFF VIN OUT IN 33F OUT NC D- 0.01 F IN GND GND Ferrite Bead 0.01 F DATA 33F, 16V Tantalum, or 100F, 10V Electrolytic Bold line indicate high-current traces One Port Self Powered Hub Date: 12/22/04 SP2525A USB High-Side Power Switch 1 (c) Copyright 2004 Sipex Corporation ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Supply Voltage(VIN)..........................................7.0V Fault Flag Voltage (VFLG)..................................7.0V Fault Flag Current (IFLG)..................................50mA Enable Input (VEN).....................................-0.3V - 15V Operating Temperature Range.............-40C to +85C Storage Temperature Range..............-65C to +150C Power Dissipation Per Package 8-pin NSOIC (derate 6.14mW/OC above +70OC).......500mW ELECTRICAL CHARACTERISTICS Unless otherwise noted, the following specifications apply for VIN = +5.0V, TA = 25C. PARAMETER MIN. Supply Current Enable Input Voltage 2.4 Enable Input Current TYP. MAX. UNITS 0.75 75 5.0 100 A VEN = Logic "0" OUT = Open VEN = Logic "1" OUT = Open 1.7 2.0 0.8 V VEN = Logic "0" VEN = Logic "1" 0.01 0.01 1 1 A VEN = Logic "0" VEN = Logic "1" Enable Input Capacitance 1 Output Mosfet Resistance 70 Output Turn-On Delay 100 Output Turn-On Rise Time 1000 Output Turn-Off Delay Output Turn-Off Fall Time 0.6 100 m RL=10 each output 4000 s RL=10 each output 0.8 20 s RL=10 each output 0.7 20 s RL=10 each output 10 A 1.25 A 1.0 Over-Temperature Shutdown Threshold 135 125 Error Flag Output Resistance 10 15 Error Flag Off Current 0.01 UVLO Threshold 2.6 2.4 Date: 12/22/04 pF s Output Leakage Current Current Limit Threshold CONDITIONS C TJ increasing TJ decreasing 25 40 VIN = 5V,IL = 10mA VIN = 3.3V,IL = 10mA 1 A VFLAG = 5V V VIN increasing VIN decreasing O SP2525A USB High-Side Power Switch 2 (c) Copyright 2004 Sipex Corporation PIN DESCRIPTION Pin Number Pin Name Description 1 EN Enable Input Active High for SP2525A-1 and Active Low for SP2525A-2. 2 FLG An active-low and open-drained fault flag output for power switch. It can indicate current limit if CTL is active. In normal mode operation, it also can indicate thermal shutdown or undervoltage. 3 GND Chip power ground. 4 NC Not internally connected. 5, 7 IN Power supply input. 6, 8 OUT MOSFET switch output. TEST CIRCUIT 10K VCC +5V SP2525A ON OUT EN OFF FLG IN 10 GND OUT NC Date: 12/22/04 IN SP2525A USB High-Side Power Switch 3 0.1F (c) Copyright 2004 Sipex Corporation APPLICATION INFORMATION Error Flag An error Flag is an open-drained output of an Nchannel MOSFET, the FLG output is pulled low to signal the following fault conditions: input undervoltage, output current limit, and thermal shutdown. Transient Requirements USB supports dynamic attachment (hot plug-in) of peripherals. A current surge is caused by the input capacitance of downstream device. Ferrite beads are recommended in series with all power and ground connector pins. Ferrite beads reduce EMI and limit the inrush current during hotattachment by filtering high-frequency signals. Current Limit The current limit threshold is preset internally. It protects the output MOSFET switches from damage resulting from undesirable short circuit conditions or excess inrush current, which is often encountered during hot plug-in. The low limit of the current limit threshold of the SP2525A allows a minimum current of 0.5A through the MOSFET switches. A current limit condition will signal the error flag. Short Circuit Transient Bulk capacitance provides the short-term transient current needed during a hot-attachment event. A 33 F/16V tantalum or a 100F/10V electrolytic capacitor mounted close to downstream connector each port should provide transient drop protection Printed Circuit Layout The Power circuitry of USB printed circuit boards requires a customized layout to maximize thermal dissipation and to minimize voltage drop and EMI. Thermal Shutdown When temperature of SP2525A exceeds 135C for any reasons, the thermal shutdown function turns off the MOSFET switch and signals the error flag. A hysteresis of 10C prevents the MOSFETs from turning back on until the chip temperature drops below 125C. Supply Filtering A 0.1F to 1F bypass capacitor from IN to GND, located near the device, is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Date: 12/22/04 SP2525A USB High-Side Power Switch 4 (c) Copyright 2004 Sipex Corporation BLOCK DIAGRAM OUT Driver EN Current Limit Charge Pump Thermal Shutdown UVLO CS Power N-MOSFET FLG IN GND Date: 12/22/04 SP2525A USB High-Side Power Switch 5 (c) Copyright 2004 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted. Output On-Resistance vs. Supply Voltage On-Resistance vs. Temperature 70 90 80 68 ON Resistance (m) Switch-ON Resistance (m) 69 67 66 70 60 65 64 50 2 3 4 5 6 7 -60 -40 -20 0 Supply Voltage (V) 20 40 60 80 100 120 Temperature (C) Figure 2. Output On-Resistance vs. Temperature Figure 1. Output On-Resistance vs. Supply Voltage UVLO Threshold Voltage vs. Temperature ON-State Supply Current vs. Supply Voltage 2.8 100 2.7 90 Switch-ON Supply Current (A) UVLO Threshold Voltage (V) Rising 2.6 2.5 2.4 Falling 70 60 2.3 2.2 -40 80 -20 0 20 40 60 80 100 50 120 2 3 Temperature (C) 5 6 7 8 Supply Voltage (V) Figure 3. UVLO Threshold Voltage vs. Temperature Date: 12/22/04 4 Figure 4. On-state Supply Current vs. Supply Voltage SP2525A USB High-Side Power Switch 6 (c) Copyright 2004 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted. ON-State Supply Current vs. Supply Voltage OFF State Supply Current vs. Supply Voltage 100 0.10 0.08 Supply Current (A) Switch-ON Supply Current (A) 90 80 70 60 0.06 0.04 0.02 50 0.00 2 3 4 5 6 7 8 3 4 5 Supply Voltage (V) 6 7 8 Supply Voltage (V) Figure 5. On-state Supply Current vs. Temperature Figure 6. Off-state Supply Current vs. Supply Voltage CTL Threshold Voltage vs. Supply Voltage Current Limit Threshold vs. Temperature 2.80 1.15 2.60 1.10 2.40 1.05 2.00 Output Threshold (A) Threshold Voltage (V) 2.20 CTL Rising 1.80 1.60 CTL Falling 1.40 1.00 0.95 0.90 0.85 1.20 0.80 1.00 0.75 0.80 2 3 4 5 6 -60 7 -40 -20 20 40 60 80 100 120 140 Figure 8. Current Limit Threshold vs. Temperature Figure 7. Control Threshold vs. Supply Voltage Date: 12/22/04 0 Temperature (C) Supply Voltage (V) SP2525A USB High-Side Power Switch 7 (c) Copyright 2004 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted. Output Rise Time vs. Temperature Output Fall Time vs. Temperature 0.54 1.40 0.52 1.35 Turn-off Fall Time (S) Turn-ON Resistance (mS) 0.50 1.30 1.25 1.20 0.48 0.46 0.44 1.15 0.42 1.10 0.40 0.38 1.05 -40 -20 0 20 40 60 80 100 -40 120 -20 Figure 9. Output Rise Time vs. Temperature Date: 12/22/04 0 20 40 60 80 100 120 Temperature (C) Temperature (C) Figure 7. Output Fall Time vs. Temperature SP2525A USB High-Side Power Switch 8 (c) Copyright 2004 Sipex Corporation PACKAGE: 8 Pin NSOIC D O e E/2 E1/2 E1 L2 E Seating Plane L1 1 O L O1 Gauge Plane VIEW C b INDEX AREA (D/2 X E1/2) TOP VIEW A1 A Seating Plane A2 8 Pin NSOIC JEDEC MO-012 (AA) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.24 4.90 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 o 0 8 o1 5 15 SIDE VIEW B B SEE VIEW C b c Note: Dimensions in (mm) BASE METAL SECTION B-B WITH PLATING Date: 12/22/04 SP2525A USB High-Side Power Switch 9 (c) Copyright 2004 Sipex Corporation ORDERING INFORMATION Part Number Temperature Range Package Types SP2525A-1EN ................................................. -40C to +85C ................................................... 8-pin NSOIC SP2525A-1EN/TR ........................................... -40C to +85C .................................................. 8-pin NSOIC SP2525A-2EN ................................................. -40C to +85C ................................................... 8-pin NSOIC SP2525A-2EN/TR ........................................... -40C to +85C .................................................. 8-pin NSOIC Available in lead free packaging. To order add "-L" suffix to part number. Example: SP2525A-1N/TR = standard; SP2525A-1N-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,000 for NSOIC. CLICK HERE TO ORDER SAMPLES Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Date: 12/22/04 SP2525A USB High-Side Power Switch 10 (c) Copyright 2004 Sipex Corporation