Dual-Channel Power Distribution Switch TJ2205 FEATURES z z z z z z z z z z z 2.7V to 5.5V Operating Range 500mA Continuous Current per Channel 1.25A Maximum Short Circuit Current limit 90uA Typical On-State Supply Current 1uA Maximum Standby Supply Current Independent open-drain fault flag pins Thermal Shutdown Protection 2.4V typical Under Voltage Lockout(UVLO) TJ2205H : Active High version TJ2205L : Active Low version UL Recognized. UL File No. E347996 SOP8 PKG ORDERING INFORMATION Device TJ2205HD APPLICATION z z z z z z Package SOP8 TJ2205LD USB Peripherals General Purpose Power Switching ACPI Power Distribution Notebook PCs PDAs Hot Plug-in Power Supplies DESCRIPTION The TJ2205X is dual-channel High-Side MOSFET switches optimized for general-purpose power distribution requiring circuit protection. The TJ2205 series support the following USB requirements. Each of the two channels supplies up to 500mA as required by USB downstream devices. Each switch’s low on-resistance meets USB voltage drop requirements. Fault current is limited to typically 1.2A. Flag output indicates fault conditions to the local USB controller. Soft-start prevents the transient voltage drop on the upstream port that can occur when the switch is enabled in bus-powered applications. Under voltage lockout (UVLO) feature disables the output switches until a valid input voltage. Also the TJ2205 include thermal shutdown to prevent switch failure from high-current loads. Absolute Maximum Ratings (Note 1) Characteristic Symbol Min Max Unit VIN -0.3 6.0 V VEN -0.3 6.0 V Fault Flag Voltage VFLG - 6.0 V Fault Flag Current IFLAG - 25 mA Output Voltage VOUT 6.0 V Output Current IOUT Internally Limited Storage Temperature Range TSTG Supply Voltage Enable Input Voltage Oct. 2011 – R1.1 (Note 2) -1- -65 150 ℃ HTC Dual-Channel Power Distribution Switch Operating Ratings TJ2205 (Note 3) Characteristic Symbol Min Max Unit Supply Voltage VIN 2.7 5.5 V Ambient Temperature Range TA -40 85 ℃ Operating Junction Temperature Range TJ -40 125 ℃ Thermal Resistance SOP Junction to Ambient θJA - 165 ℃/W Thermal Resistance SOP Junction to Case θJC - 26 ℃/W Note: 1. Exceeding the absolute maximum ratings may damage the device. 2. It is recommended for VEN voltage not to exceed VIN voltage. 3. The device is not guaranteed to function outside its operating rating. 4. Devices are ESD sensitive. Handling precautions are recommended. Ordering Information TJ 2205 Package Type :D : SOP8 Green Mode G : Halogen Free Blank : Pb Free Enable Mode H L : Active – High : Active – Low Root Name Product Code Oct. 2011 – R1.1 -2- HTC Dual-Channel Power Distribution Switch TJ2205 TYPICAL APPLICATION CIRCUIT VCONT USB Ports VCC 2.7V to 5V TJ2205 7 IN 0.1uF 10K OUT1 8 0.1uF 10K USB Control 2 1 3 4 D+ D33uF VBUS GND FLG1 EN1 FLG2 EN2 OUT2 D+ D- 5 0.1uF GND 6 33uF VBUS GND USB Ports FUNCTION BLOCK DIAGRAM OUT1 Current Limit EN1 Flag Logic Gate Control FLG1 Thermal Shutdown UVLO BIAS IN FLG2 Gate Control Flag Logic Current Limit EN2 OUT2 GND Oct. 2011 – R1.1 -3- HTC Dual-Channel Power Distribution Switch TJ2205 PIN CONFIGURATION PIN DESCRIPTION Pin No. Pin Name 1 EN1 2 FLG1 Fault Flag1: Active-low, open-drain output. Indicates Short circuit, UVLO and Thermal shutdown. 3 FLG2 Fault Flag2: Active-low, open-drain output. Indicates Short circuit, UVLO and Thermal shutdown. 4 EN2 5 OUT2 Switch Output2: Output MOSFET source. Typically connect to switched side of load. 6 GND Ground 7 IN Supply Input: Output MOSFET drain. Also supplies IC’s internal circuitry. Connect to positive supply. 8 OUT1 Switch Output1: Output MOSFET source. Typically connect to switched side of load. Oct. 2011 – R1.1 Pin Description & Function Enable1: Logic-Compatible enables input. (H: active high, L: active low). Do not float. Enable2: Logic-Compatible enables input. (H: active high, L: active low). Do not float. -4- HTC Dual-Channel Power Distribution Switch TJ2205 ELECTRICAL CHARACTERISTICS (Under the conditions of VIN=+5V and TA=25℃) PARAMETER Symbol Operating Voltage Range VIN Supply Current ICC CONDITIONS MIN TYP 2.7 MAX UNITS 5.5 V Enable off ,OUT=Open 0.05 1 uA Enable on, OUT=Open 90 160 uA Enable Input Threshold Voltage VEN (Note 5) 0.8 1.7 2.4 V Enable Input Current IEN VEN = 0V to 5.5V -1 0.01 1 uA Enable Input Capacitance CEN Switch Resistance Output Turn-On Delay Output Turn-On Rise Time Output Turn-Off Delay Output Turn-Off Fall Time 1 pF VIN=5V, IOUT=500mA 160 200 mΩ VIN=3.3V, IOUT=500mA 200 230 mΩ TDON RL=10Ω each output, CL=1uF 50 us TR RL=10Ω each output, CL=1uF 40 us TDOFF RL=10Ω each output, CL=1uF 0.5 10 us TF RL=10Ω each output, CL=1uF 0.5 10 us 0.01 5 uA RDS(ON) Output leakage Current ILEAK VENX≤0.8V Current Limit Threshold ILIM Ramped load applied to output 1.0 1.2 1.4 A Short Circuit Current Limit IOS each output, VOUT=0V 0.7 1.0 1.25 A Over-Temperature Shutdown Threshold TTS Error Flag Output Resistance RFO Error Flag Off Current UVLO Threshold Overcurrent Flag Response Delay IFOH UVLO TDFOV Temperature increasing switch 145 o C Temperature decreasing switch 135 o C VIN=5V, IL=10mA 10 25 Ω VIN=3.3V, IL=10mA 15 40 Ω 0.01 10 uA VFLAG=5V VIN = increasing 2.3 2.5 2.7 V VIN = decreasing 2.1 2.3 2.5 V VIN=5V, apply VOUT=0V until FLG low 0.45 ms Note: 5. OFF is VEN≤0.8V and ON is VEN≥2.4V for the TJ2205H. OFF is VEN≥2.4V and ON is VEN≤0.8V for the TJ2205L. Oct. 2011 – R1.1 -5- HTC Dual-Channel Power Distribution Switch TJ2205 Test Circuit Oct. 2011 – R1.1 -6- HTC Dual-Channel Power Distribution Switch TJ2205 TYPICAL PERFORMANCE CHARACTERISTICS ON-Resistance vs. Temperature ON-Resistance vs. Supply Voltage On-Current vs. Temperature On-Current vs. Supply Voltage Enable Threshold vs. Temperature Oct. 2011 – R1.1 Enable Threshold vs. supply Voltage -7- HTC Dual-Channel Power Distribution Switch TJ2205 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Turn-On Delay Time vs. Temperature Turn-On Delay Time vs. Supply voltage Turn-On Rise Time vs. Temperature Turn-On Rise Time vs. Supply Voltage Turn-Off Fall Time vs. Temperature Turn-Off Fall Time vs. Supply Voltage Oct. 2011 – R1.1 -8- HTC Dual-Channel Power Distribution Switch TJ2205 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) Current Limit Threshold vs. Temperature Current Limit Threshold vs. Supply Voltage Short Circuit Current vs. Temperature UVLO vs. Temperature Oct. 2011 – R1.1 -9- HTC Dual-Channel Power Distribution Switch TJ2205 TYPICAL OPERATING CHARACTERISTICS - VIN=5V, C1=1uF, VEN=VIN, TA=25oC, unless otherwise noted Oct. 2011 – R1.1 Turn – ON / Turn-OFF Turn – ON Turn – OFF Inrush Current Response Enable Into Short (TJ2205H) Thermal Shutdown - 10 - HTC Dual-Channel Power Distribution Switch TJ2205 TYPICAL OPERATING CHARACTERISTICS (continued) UVLO – VIN Rising Oct. 2011 – R1.1 UVLO – VIN Falling - 11 - HTC Dual-Channel Power Distribution Switch TJ2205 Function Description Supply Filtering A 0.1uF to 1uF bypass capacitor from IN pin to GND pin is recommended to control power supply transients. Without this bypass capacitor, an output short can cause ringing from supply lead inductance on the input and damage the internal control circuitry. Input or output transients must never exceed the absolute maximum supply voltage (VINmax = 6V) Power Dissipation The device’s junction temperature depends on several factors such as the load, PCB layout, ambient temperature, and package type. Equations that can be used to calculate power dissipation of each channel and junction temperature are found below: PD=RDS(ON) x IOUT2 Total power dissipation of the device will be the summation of PD for both channels. To relate this to junction temperature, the following equation can be used: TJ=PD x θJA +TA Where: TJ = Junction temperature TA = Ambient temperature θJA= Thermal resistance of the package Enable/Shutdown The EN1 and EN2 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. Fault Flag The FLG signal is open-drained output of N-channel MOSFET, the FLG output is pulled low to signal the following fault conditions: input under voltage, output to GND short, and thermal shutdown. Soft-Start Condition The TJ2205 has high impedance when off, which gradually shifts to low impedance as the chip turns on. This prevents an inrush current from causing voltage drops that result from charging a capacitive load and can pull the USB voltage bus below specified levels. This satisfies the USB voltage droop requirements for bus-powered applications. The TJ2205 can provide inrush current limiting for applications with large load capacitances where CL >10uF. Current Sense A sense MOSFET monitors the current supplied to the load. The sense MOSFET measures current more efficiently than conventional resistance methods. When an overload or short circuit is encountered, the current-sense circuitry sends a control signal to the driver. The driver in turn reduces the gate-source voltage and drives the power MOSFET into its saturation region, which switches the output into a constant-current mode and holds the current constant while varying the voltage on the load. Over-Current and Short-Circuit Protection The TJ2205 features an over-current protection circuitry to protect the device against overload conditions. The current limit threshold is preset internally. It protects the output MOSFET switches from damage due to undesirable short circuit conditions of excess inrush current often encountered during hot plug-in. The low limit of the current limit threshold of the TJ2205 allows a minimum current of 0.5A through the Oct. 2011 – R1.1 - 12 - HTC Dual-Channel Power Distribution Switch TJ2205 MOSFET switches. A current limit condition will signal the error flag. These features can protect the load system effectively at any accidental circumstances. Thermal Shutdown Protection Thermal shutdown limits the TJ2205 junction temperature and protects the device from damage as a result of overheated. Thermal protection turns off when the TJ2205’s junction temperature 145℃ reached, allowing it to cool down until 135℃. The TJ2205 is reactivated when a junction temperature drops to approximately 130℃. It depends on the power dissipation, thermal resistance, and ambient temperature. Under Voltage Lockout Under Voltage Lockout (UVLO) prevents the output MOSFET from turning on until VIN exceeds approximately 2.5V. After the switch turns on, if the voltage drops below 2.3V typically, UVLO shuts off the output MOSFET. Under voltage detection functions only when the switch is enabled. 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. USB Compliance The TJ2205 is ideal for self-powered and bus powered 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 TJ2205 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. 6) An Under-voltage Lockout ensures that the device remains off unless there is a valid input supply voltage present. 7) +2.7V 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. Table 1. USB Protocol Compliance of the TJ2205 device USB REQUIREMENT TJ2205 COMPLIANT FEATURE Inrush Current limiting required Soft Start turns on in 1ms Suspend State of <500uA Required Suspend Current of 1uA Maximum Bus powered hubs must have 350mV drop from cable plug to port. Switch on resistance of 200mΩ maximum (translates to 100mV at 500mA) Voltage supplied to host or hub port is +4.75V to +5.25V Operating range of +2.7V to +5.5V A device that draws bus power must have a stable supply within 100ms of VBUS reaching +4.4V Turn on in 1ms Over-Current reporting capability required Open drain fault flags. Oct. 2011 – R1.1 - 13 - HTC