SP2525-2EN

® SP2525 +3.0V to +5.5V USB Power Control Switch s Compliant to USB Specifications s +3.0V to +5.5V Input Voltage Range s Open Drain Error Flag Output s 2.7V Undervoltage Lockout s 500mA Minimum Continuous Load Current s 1.25A Short Circuit Current Limit s 140mΩ Maximum On-Resistance s 80µA On-State Supply Current s 1µA Shutdown Current s Thermal Shutdown s 1ms Soft-Start Power Up s Active-High Version: SP2525-1 s Active-Low Version: SP2525-2 DESCRIPTION The SP2525 device is a single +3.0V to +5.5V USB Supervisory Power Control Switch ideal for self-powered and bus-powered Universal Serial Bus (USB) applications. The SP2525 device has low on-resistance (80mΩ typical) and can supply 500mA minimum. The fault currents are limited to 2.0A typical and the flag output pin is available to indicate fault conditions to the USB controller. The 1ms soft start of the SP2525 device will eliminate any momentary voltage drop on the upstream port that may occur when the switch is enabled in bus-powered applications. The thermal shutdown feature will prevent permanent damage to the SP2525 device when subjected to excessive current loads. The under voltage lockout feature will ensure that the SP2525 device will remain off unless there is a valid input voltage present. EN FLG GND NC 1 2 3 4 SP2525 8 7 6 5 OUT IN OUT NC Rev. 8/21/01 SP2525 +3.0 to +5.5 Power Control Switch © Copyright 2001 Sipex Corporation 1 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.......................................-0.3V, +6.0V Operating Temperature......................-40˚C to +85˚C Storage Temperature.......................-65˚C to +150˚C Power Dissipation Per Package 8-pin NSOIC (derate 6.14mW/OC above +70OC).......500mW SPECIFICATIONS Unless otherwise noted, the following specifications apply for VIN = +5.0V and TAMB = 25OC. PARAMETER Operating Voltage Range, VIN Supply Current, IIN Enable Input Threshold Voltage MIN. 3.0 TYP. MAX. 5.5 UNITS V µA V µA pF CONDITIONS 0.05 80 0.8 2.1 1.9 0.01 0.01 1 80 0.5 1 1 1 .02 2.0 0.5 0.75 135 125 10 15 0.01 2.5 2.7 2.6 5.0 140 2.4 1 1 enable off, no output load enable on, no output load low to high transition high to low transition VEN=VOH(min)=2.4V VEN=VOL(max)=0.8V Enable Input Current Enable Input Capacitance Switch Resistance Output Turn-On Delay Output Turn-On Rise Time Output Turn-Off Delay Output Turn-Off Fall Time Output Leakage Current Current Limit Threshold Short Circuit Current Limit Over-Temperature Shutdown Threshold Error Flag Output Resistance Error Flag Off Current UVLO Threshold 140 mΩ ms ms 3.0V 10µF. Refer to the circuit in Figure 7 for a configuration that will meet USB transient regulation specifications with large load capacitances. Enable Input The ENA and ENB control pins must be driven to a logic high or logic low for a clearly defined signal input. Floating these control lines may cause unpredictable operation. USB Compliance The SP2525 is ideal for self-powered and buspowered Universal Serial Bus (USB) applications. A USB port provides a +5.0V bus and ground return line in addition to a twisted pair for data. The SP2525 will comply with the following USB requirements: 1) The fault current is well below the UL 25VA safety requirements; 2) The Flag Outputs are available to indicate fault conditions to USB controllers; 3) The MOSFET switches' low on-resistance meets USB voltage drop requirements; 4) Each MOSFET switch channel can supply 500mA as required by USB downstream devices; 5) Soft start eliminates any momentary voltage drops on the upstream port that may occur when the switches are enabled in bus-powered applications. Refer to Table 1 for a USB compliance summary of the SP2525. Additional features include the following: 6) An Undervoltage Lockout ensures that the device remains off unless there is a valid input supply voltage present; 7) +3.3V and +5.0V logic compatible enable inputs; 8) Thermal Shutdown prevents the possibility of catastrophic switch failure from high-current loads; 8) The device is available in both active-high and active-low versions. Refer to Figures 8 to 23 for typical performance characteristics of the SP2525. Rev. 8/21/01 SP2525 +3.0 to +5.5 Power Control Switch © Copyright 2001 Sipex Corporation 8 USB Controller +5.0V OVERCURRENT SP2525 ENA FLGA FLGB ENB 1 2 3 4 8 OUTA 7 IN 6 GND 5 OUTB 0.1µF to 1.0µF +5.0V 10kΩ 10kΩ ENA FLGA FLGB ENB 1 2 3 4 SP2525 8 OUTA 7 IN 6 GND 5 OUTB 0.1µF Figure 4. Bypass Capacitor at the Supply Pins Figure 5. An RC Filter for Overcurrent Faults USB Controller USB Powered Hub USB Cable VBUS USB Host GND 4.7µF SP2525 ENA FLGA FLGB ENB 1 2 3 4 8 OUTA 7 IN 6 GND 5 OUTB 0.1µF CBULK USB Cable Downstream USB Device Figure 6. Soft Start Circuit Configuration for a Single Channel USB-powered Application with the SP2526 Rev. 8/21/01 SP2525 +3.0 to +5.5 Power Control Switch © Copyright 2001 Sipex Corporation 9 USB Controller USB Peripheral OUTA PORT A GND USB Cable VBUS USB Host GND 4.7µF SP2525-2 ENA FLGA FLGB ENB 1 2 3 4 8 OUTA 7 IN 6 GND 5 OUTB 0.1µF CBULK GND PORT B OUTB CBULK Figure 7. Soft Start Circuit Configuration for SP2526 Applications with Large Load Capacitances USB Requirement Inrush current limiting required Suspend State of