Adjustable Current Limited Power Distribution Switch TJ2100 FEATURES 105mΩ High-Side MOSFET 2.7V to 5.5V Operating Range Adjustable Current Limit : 200mA to 3.0A(Typ.) ±10% Current-Limit Accuracy at 1.5A(Typ.) Fold-back Short Circuit Protection 90uA Typical On-State Supply Current 1uA Maximum Standby Supply Current Independent Open-drain Fault Flag Pin Thermal Shutdown Protection Under Voltage Lockout(UVLO) TJ2100H : Active High version TJ2100L : Active Low version TJ2100A : Fixed Enable version SOT23-6L PKG APPLICATION USB Peripherals General Purpose Power Switching ACPI Power Distribution Notebook PCs PDAs Hot Plug-in Power Supplies DFN2X2-6L PKG DESCRIPSION The TJ2100X is single-channel High-Side MOSFET switch optimized for adjustable current limited power distribution requiring circuit protection. The TJ2100X series support the following USB requirements. The TJ2100 series supply up to 2.5A as required by USB downstream devices. Maximum continuous current can be different on the types of package and ambient temperature. Switch’s low on-resistance meets USB voltage drop requirement. Flag output indicate fault condition 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 TJ2100 include thermal shutdown to prevent switch failure from high-current loads. May. 2014–R1.2 ORDERING INFORMATION Device Package TJ2100HGSF6 TJ2100LGSF6 SOT23-6L TJ2100AGSF6 TJ2100HGQ TJ2100LGQ DFN2X2-6L TJ2100AGQ -1- HTC Adjustable Current Limited Power Distribution Switch Absolute Maximum Ratings TJ2100 (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 Operating Ratings (Note 2) -65 ℃ 150 (Note 3),(Note 4) Characteristic Symbol Min Max Unit Supply Voltage VIN 2.7 5.5 V Ambient Temperature Range TA -40 +80 ℃ Operating Junction Temperature Range TJ -40 125 ℃ Thermal Resistance Junction-to-Ambient SOP23-6L (Note 5) θJA 250 o C/W DFN2x2-6L(Note 6) θJA 165 o C/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. 2 5. Test Condition for SOT23-6L : Copper Area = 35mm , Board Size = 430 mm X 430mm, 1.6T 2 6. Test Condition for DFN2x2-6L : Copper Area = 35mm , Board Size = 430 mm X 430mm, 1.6T May. 2014–R1.2 -1- HTC Adjustable Current Limited Power Distribution Switch TJ2100 Ordering Information Package Oder No. Description Marking Compliance Status SOT23-6L TJ2100LGSF6 Adjustable , Active Low 2100LG RoHS, Green Contact Us DFN2X2-6L TJ2100LGQ Adjustable , Active Low 2100LG RoHS, Green Contact Us SOT23-6L TJ2100HGSF6 Adjustable , Active High 2100HG RoHS, Green Contact Us DFN2X2-6L TJ2100HGQ Adjustable , Active High 2100HG RoHS, Green Contact Us SOT23-6L TJ2100AGSF6 Adjustable, Fixed Enable 2100AG RoHS, Green Contact Us DFN2X2-6L TJ2100AGQ Adjustable, Fixed Enable 2100AG RoHS, Green Contact Us TJ 2100 Package Type SF6 Q Green Mode G : Halogen Free Blank : Pb Free Enable Mode Root Name H L A : SOT23-6L : DFN2X2-6L : Active – High : Active – Low : Fixed Enable Product Code May. 2014–R1.2 -2- HTC Adjustable Current Limited Power Distribution Switch TJ2100 TYPICAL APPLICATION CIRCUIT VCONT VCC 2.7V to 5V TJ2100L/H USB Ports IN 10uF 10K OUT VBUS 33uF FLG EN USB Control GND ILIM GND RILIM 20kΩ 1uF VCONT VCC 2.7V to 5V TJ2100A USB Ports IN 10K 10uF OUT VBUS 33uF USB Control D+ D- FLG D+ DGND 1uF ILIM GND RILIM 20kΩ FUNCTION BLOCK DIAGRAM OUT EN / NC Current Limit Flag Logic Gate Control FLG Thermal Shutdown UVLO BIAS IN ILIM GND May. 2014–R1.2 -3- HTC Adjustable Current Limited Power Distribution Switch TJ2100 PIN CONFIGURATION OUT 1 6 IN ILIM 2 5 GND FLG 3 4 EN/NC 6 OUT IN 1 GND 2 PAD EN/NC 3 5 ILIM 4 FLG DFN2X2-6L SOT-23-6L PIN DESCRIPTION Pin No. Pin Name Pin Description & Function SOT23-6L DFN2X2-6L OUT 1 6 Switch Output: Output MOSFET source. Typically connect to switched side of load. ILIM 2 5 Current Limit Set. External resistor used to set current limit threshold. FLG 3 4 Fault Flag: Active-low, open-drain output. Indicates Short circuit current, UVLO and Thermal shutdown. Enable: Logic-Compatible enable input. (H: active high, L: EN / NC 4 3 active low). Do not float. NC: No internal connection at fixed enable type. (Note 7) GND 5 2 Ground IN 6 1 Supply Input: Output MOSFET drain. Also supplies IC’s internal circuitry. Connect to positive supply. Note: 7. The NC pin in TJ2100A is recommended to tie at Ground. May. 2014–R1.2 -4- HTC Adjustable Current Limited Power Distribution Switch TJ2100 ELECTRICAL CHARACTERISTICS (Under the conditions of VIN=+5V and TA=25℃) PARAMETER Operating Voltage Range Symbol CONDITIONS VIN MIN 2.7 1 Enable on, OUT=Open 80 150 uA 2.0 V 1 uA ICC Enable Input Threshold Voltage VEN (Note 9) 0.8 Enable Input Current IEN VEN = 0V to 5.5V -1 Enable Input Capacitance CEN Output Turn-On Rise Time Output Turn-Off Delay Output Turn-On Fall Time Output leakage Current Current Limit Threshold (Note 11) Short Circuit Current Limit 105 125 mΩ 150 mΩ 70 us TR RL=5Ω each output, CL=1uF 60 us TDOFF RL=5Ω each output, CL=1uF 5 us TF RL=5Ω each output, CL=1uF 10 us ILEAK ILIM ISC Error Flag Off Current IFOH UVLO Current Limit Response Time VIN=5V, IOUT=1.0A 125 RFO Response pF RL=5Ω each output, CL=1uF Error Flag Output Resistance Flag 1 VIN=3.3V, IOUT=1.0A TTS Overcurrent Delay 0.01 TDON Over-Temperature Shutdown Threshold UVLO Threshold 5.5 V A A uA Supply Current Output Turn-On Delay UNITS 2.3 2.9 0.05 IOUT RDS(ON) MAX SF6 package Q package Enable off ,OUT=Open Recommended Maximum Continuous Current (Note 8) Switch Resistance TYP TDFOV TLIM VENX≤0.8V 0.01 RILIM = 12kΩ 2070 RILIM = 20kΩ 1223 RILIM = 49.9kΩ 484 5 uA mA RILIM = 121kΩ 196 RILIM = 12kΩ , VOUT=0V 1446 RILIM = 20kΩ, VOUT=0V 859 RILIM = 49.9kΩ, VOUT=0V 338 RILIM = 121kΩ, VOUT=0V 137 Temperature increasing switch 150 o C Temperature decreasing switch 130 o C VIN=5V, IL=10mA 10 VIN=3.3V, IL=10mA mA Ω Ω 15 VFLAG=5V 0.01 10 uA VIN = increasing 2.00 2.15 2.4 V VIN = decreasing VIN=5V, apply VOUT=0V until FLG low 1.85 2.00 2.25 V (Note 10) 7 ms 1 us Note: 8. Maximum ambient temperature is a function of device junction temperature and system level considerations, such as load current, power dissipation and board layout. 9. OFF is VEN≤0.8V and ON is VEN≥2.0V for the TJ2100H. OFF is VEN≥2.0V and ON is VEN≤0.8V for the TJ2100L. 10. TLIM is the response time to operate current limit when the peak value of the current is increased more than set limit value. 11. It is recommended that current limit level set to 1.5 times more than constant current for a stable power supply. May. 2014–R1.2 -5- HTC Adjustable Current Limited Power Distribution Switch TJ2100 Test Circuit TJ2100L/H VCC IN R1 10K OUT C1 0.1u to 10uF VOUT R2 FLG EN CL ILIM GND RILIM CF (Note 12) 1uF TJ2100A VCC IN R1 10K OUT C1 0.1u to 10uF VOUT R2 CL FLG CF (Note 12) 1uF ILIM GND RILIM Note: 12. When the CF should be omitted, it is highly recommended to apply 2.2uF or higher capacitance for C1. May. 2014–R1.2 -6- HTC Adjustable Current Limited Power Distribution Switch TJ2100 TYPICAL PERFORMANCE CHARACTERISTICS ON-Resistance vs. Temperature ON-Resistance vs. Supply Voltage On - Current vs. Temperature On - Current vs. Supply Voltage Enable ON Threshold vs. Temperature Enable ON Threshold vs. supply Voltage May. 2014–R1.2 -7- HTC Adjustable Current Limited Power Distribution Switch TJ2100 Enable OFF Threshold vs. Temperature Enable OFF Threshold vs. supply Voltage Current Limit Threshold vs. Temperature Current Limit Threshold vs. Supply Voltage Short Circuit Current vs. Temperature Short Circuit Current vs. Supply Voltage May. 2014–R1.2 -8- HTC Adjustable Current Limited Power Distribution Switch TJ2100 UVLO vs. Temperature May. 2014–R1.2 -9- HTC Adjustable Current Limited Power Distribution Switch TJ2100 TYPICAL OPERATING CHARACTERISTICS - o VIN=5V, VEN=5V, TA=25 C, RLIM=15kΩ, CIN=10uF unless otherwise noted Turn – ON (TJ2100H) Turn – OFF (TJ2100H) Stepped Short(TJ2100H) Inrush Current Response(TJ2100H) Stepped Short(TJ2100H) May. 2014–R1.2 Enable into Short(TJ2100H) - 10 - HTC Adjustable Current Limited Power Distribution Switch UVLO(TJ2100H) May. 2014–R1.2 TJ2100 Thermal Shutdown(TJ2100H) - 11 - HTC Adjustable Current Limited Power Distribution Switch TJ2100 Function Description Supply Filtering A 0.1uF to 10uF bypass capacitor from IN pin to GND pin is recommended to control power supply transients. Recommend X5R or X7R dielectrics when using ceramic capacitors for input/output. 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 not exceed the absolute maximum supply voltage (VIN(MAX) = 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: 2 PD=RDS(ON) x IOUT Total power dissipation of the device will be the summation of P D 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 EN control pin must be driven to a logic high or logic low for a clearly defined signal input. And if it is the pin of the fixed enable type must be fixed by connecting to GND. 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 short to GND and thermal shutdown. Also a 1uF capacitor is recommended to be placed directly next to the FLG pin. It is to prevent the glitches. Soft-Start Condition The TJ2100 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 TJ2100 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. When operating region of power MOSFET is close to saturation region, ON resistance of power MOSFET is made significantly increase. It can cause the operation of thermal protection before reaching to current limit level. May. 2014–R1.2 - 12 - HTC Adjustable Current Limited Power Distribution Switch TJ2100 Over-Current and Short-Circuit Protection The TJ2100 features an over-current protection circuitry to protect the device against overload conditions. The current limit threshold is user programmable via an external resistor. The TJ2100 provides an adjustable current limit threshold between 200mA and 3.0A(Typ.). The recommended 1% resistor range for RILIM is 8.9kΩ to 121kΩ. It protects the output MOSFET switch from damage due to undesirable short circuit conditions of excess inrush current often encountered during hot plug-in. Also the TJ2100 is including a fold back current limiting function for short-circuit protection. In the event of an output shortcircuit condition, the current flowing through the switch is about 25~40% smaller than the current limit threshold(ILIM). A short circuit current limit condition will signal the error flag. These features can protect the load system effectively at any accidental circumstances. The following equations can be used to calculate the resulting current limit threshold and short circuit current for determining external resistor value (RILIM). However, in the equation do not considered tolerance factors like that processing variation from part to part, as well as variations in the voltage at IN and OUT, plus the operating temperature. Therefore current limit may be operated more than the calculated value. When input voltage oscillates by external factors, input current also oscillates. It can cause the malfunction to current limit operation. In case of the peak value of current is increased more than set limit value, the current limit function of TJ2100 operates. Then the RMS value of the current limit may operate lower than a targeted level. Equations for current limit: 𝐼 𝐼 = = 26117.8 . 𝑅 𝑘Ω 𝐼 = 26117.8 𝑅 . 𝑘Ω 𝐼 = 26117.8 𝑅 . 𝑘Ω 18248.3 𝑅 . 𝑘Ω RLIM Current Limit Resistor May. 2014–R1.2 - 13 - HTC Adjustable Current Limited Power Distribution Switch TJ2100 Table 1. Recommended RILIM Resistor Selections Desired Nominal Current Limit(mA) 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 Actual Limits(mA) Calculated RILIM(kΩ) Calculated ISC(mA) 118.69 79.76 60.16 48.34 40.43 34.76 30.49 27.17 24.50 22.31 20.49 18.94 17.62 16.46 15.45 14.56 13.77 13.06 12.42 11.84 11.31 10.83 10.38 9.98 139.7 209.6 279.5 349.3 419.2 489.1 559.0 628.8 698.7 768.6 838.4 908.3 978.2 1048.0 1117.9 1187.8 1257.6 1327.5 1397.4 1467.2 1537.1 1607.0 1676.9 1746.7 RILIM(kΩ) ILIM(MIN) ILIM(NOM) ILIM(MAX) ISC(nom) 124.50 82.60 62.20 49.90 41.40 35.46 31.09 27.59 24.91 22.86 20.68 19.21 17.72 16.53 15.50 14.58 13.82 13.10 12.42 11.80 11.24 10.84 10.37 9.98 157.1 242.6 327.7 414.0 504.6 594.6 683.5 775.8 864.5 946.9 1053.1 1138.7 1240.4 1335.3 1429.5 1525.3 1614.4 1708.6 1807.9 1908.7 2009.7 2088.4 2188.8 2279.6 181 279 380 481 585 687 789 894 989 1091 1197 1296 1402 1502 1608 1698 1782 1898 2006 2086 2202 2272 2380 2478 220.2 330.5 437.6 544.3 654.8 763.3 869.4 978.6 1082.7 1178.8 1301.8 1400.4 1516.9 1625.0 1731.8 1840.0 1940.1 2045.7 2156.5 2268.7 2380.6 2467.5 2578.2 2677.9 131.00 204.50 272.50 344.00 419.50 482.50 556.00 633.00 703.00 768.00 838.00 924.00 994.00 1060.00 1118.00 1190.00 1256.00 1322.00 1386.00 1456.00 1528.00 1576.00 1642.00 1698.00 Thermal Shutdown Protection Thermal shutdown limits the TJ2100 junction temperature and protects the device from damage as a result of overheated. Thermal protection turns off when the TJ2100’s junction temperature 150℃ reached, allowing it to cool down until 130℃. The TJ2100 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 V IN exceeds approximately 2.25V. After the switch turns on, if the voltage drops below 2.05V 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. May. 2014–R1.2 - 14 - HTC Adjustable Current Limited Power Distribution Switch TJ2100 PACKAGE OUTLINE SPECIFICATION SOT23-6L May. 2014–R1.2 - 15 - HTC