UNISONIC TECHNOLOGIES CO., LTD US3075-US3375 CMOS IC POWER DISTRIBUTION SWITCH DESCRIPTION The UTC US3075-US3375 is a power distribution switch. It particularly designed for self-powered and bus-powered Universal Serial Bus (USB) applications. The RDS(ON) of the MOSFET switch is as low as 100mΩ. OC is open-drain output report over-current or over-temperature event which has deglitch typical 9ms timeout period typically 9ms. The UTC US3075-US3375 incorporates protection circuits including current limiting circuit with foldback function, thermal shutdown circuit designed to prevent catastrophic switch failure due to increasing power dissipation when continuous heavy loads or short circuit occurs. Besides, a built-in charge pump is used to drive the N-channel MOSFET that is free of parasitic body diode to eliminate any reversed current flow across the switch when it is powered off. The UTC US3075-US3375 is applied in high-side power protection switch, USB power management, USB host and self-powered bubs, USB bus-powered hubs, hot plug-in power supplies, battery-charger circuits. FEATURES * Operating on The Range of 3V to 5.5V * High-Side MOSFET with 100mΩ RDS(ON) (TYP.) * Quiescent Supply Current: 65μA * Available With 4 Versions of Current Limits with Foldback * Rise Time: 400μS (TYP.) * UVLO (Under Voltage Lockout) * Output Shutdown Pull-low Resister * Shutdown Supply Current: 1μA (MAX.) * Logic Level Enable Pin, Available with Active-High or Active-Low Version * Reverse Current is Not Generated when in Power Off State * Deglitched Open-Drain Over-Current Flag Output ( OC ) ORDERING INFORMATION Ordering Number Lead Free US3X75XL-S08-R US3X75XL-S08-T US3X75XL-SM1-R US3X75XL-SM1-T Halogen Free US3X75XG-S08-R US3X75XG-S08-T US3X75XG-SM1-R US3X75XG-SM1-T www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd Package Packing SOP-8 SOP-8 MSOP-8 MSOP-8 Tape Reel Tube Tape Reel Tube 1 of 9 QW-R502-423.E US3075-US3375 CMOS IC PIN CONFIGURATION GND 1 8 OUT IN 2 7 OUT IN 3 6 OUT EN(EN) 4 PIN DESCRIPTION PIN NO 1 2,3 4 5 6,7,8 5 OC PIN NAME DESCRIPTION GND Ground Input Supply: Output MOSFET Drain, which also supplies IC's internal circuitry. IN Connect to positive supply. Enable: Logic level enable input. Make sure EN pin never floating. EN( EN ) OC OUT Over-Current: Open-Drain OC output. Switch Output: Output MOSFET Source of switch. Typically connect to switched side of load. BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R502-423.E US3075-US3375 CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN 6 V Output Voltage VOUT 6 V Output Current IOUT Internally Limited A Enable Input VEN -0.3 ~ 6 V Storage Temperature TSTG -65~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. OPERATING RATINGS PARAMETER Supply Voltage Ambient Operating Temperature SYMBOL VIN TOPR RATINGS +3 ~ +5.5 -40~ +85 UNIT V °C ELECTRICAL CHARACTERISTICS (VIN=5V, CIN=1µF, COUT=1µF, RL=10Ω, TA=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS Input Voltage VIN US3375, IOUT =1.5A US3275, IOUT=1A Output MOS RDS(ON) US3175, IOUT=0.5A US3075, IOUT=0.3A Supply Current IIN Output Turn-on Rising Time RL=10Ω, 90% Settling US3075 US3175 Current Limit Threshold ITHD(LIMIT) VOUT=4V US3275 US3375 US3075 US3175 VOUT=0V, Short-Circuit Current ISC 2.7V<VIN<5.5 V US3275 US3375 EN Input Threshold Shutdown Supply Current ISHDN Shutdown Pull Low Resistance Output Leakage Current IO(LEAK) EN=”0”, VOUT=0V VIN Under Voltage Lockout VIN Under Voltage Hysteresis Thermal Limit Thermal Limit Hysteresis 2.2 100 130 65 400 0.75 1 1.5 2 0. 5 0.67 1 1.3 1.6 0.1 75 0.5 2.5 200 135 20 µA µs A A A A A A A A V µA Ω µA V mV °C °C 0.4 V VOC = 5V 1 µA OC Off-State Current 9 1.4 1.7 2.1 2.8 0.7 1 1.4 1.9 1.8 1 150 1 3 mΩ IOC = 5mA OC Output Low Voltage 4 MAX UNIT 5.5 V ms OC assertion or deassertion www.unisonic.com.tw 0.5 0.7 1.1 1.5 0.2 0.2 0.2 0.2 1.3 TYP 15 OC Deglitch UNISONIC TECHNOLOGIES CO., LTD MIN 3 3 of 9 QW-R502-423.E US3075-US3375 CMOS IC TEST CIRCUIT VOUT IOUT Device Under Test OUT COUT RL CL IL Current Probe UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 9 QW-R502-423.E US3075-US3375 CMOS IC TYPICAL APPLICATION CIRCUIT Power Supply 2.7V ~ 5.5V IN OC OUT 1μF Load EN(EN) ON 0.1μF 22μF OFF UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 9 QW-R502-423.E US3075-US3375 CMOS IC FUNCTIONAL DESCRIPTION Input and Output IN pin (Input) is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUT pin (Output) is the source of the output MOSFET. In a typical application, current flows through the switch from input to output toward the load. Both OUT pins must be connected together to the load. Thermal Shutdown Thermal shutdown is designed to prevent this device from being damaged due to excessive power dissipation. It is used to turn off the output MOSFET when the if the temperature is higher than135°C, 20°C of hysteresis prevents the switch turn on until the die temperature drops to 115°C. Thermal shutdown circuit functions only when the switch is enabled. Under Voltage Lockout UVLO (Under voltage Lockout) turns off the MOSFET switch once the input voltage falls below 2.3V (TYP.) and if the input voltage exceeds 2.5V (TYP.), the switch will be turned on. UVLO detection functions only when the switch is enabled. Current Limiting The current limit value is fixed internally, typically 2A, 1.5A, 1A, 0.75A for US3375/ US3275/ US3175/ US3075 respectively. There is foldback of current limit When VOUT is less than 1.5V, there is foldback of current limit. OC Function The OC open-drain output is asserted (active low) when an over current or over temperature shutdown condition is encountered after a 9-ms deglitch timeout. The output keeps asserted until the over current or over temperature condition is removed. APPLICATION INFORMATION Supply Filtering To avoid supply transients, 1μF bypass capacitor is strongly recommended to located between IN to GND. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Input transients value must be not higher than the absolute maximum supply voltage (VIN max = 6V) even for a short duration. EN, the Enable Input The enable pin, EN, must be driven logic high or logic low for a clearly defined input. The input is not allowed to float, or unpredictable operation may be occurs. EN should not be allowed to go negative with respect to GND. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 9 QW-R502-423.E US3075-US3375 CMOS IC TYPICAL CHARACTERISTICS (VIN= 5V, 3275H, CIN=1μF, COUT=1μF, VEN=0V, TA=25°C, unless otherwise specified.) 6V 6V 4V 4V VOUT 8V 2V 2V 0 0 10V 10V VEN VEN VOUT Turn on delay time and rise time 8V 5V 5V VIN=5V CL=120μF RL=5Ω 0 0 2000 Turn off delay time and fall time VIN=5V CL=120μF RL=5Ω 0 0 4000 Time (400μs/div) VOC 0 IOUT 0.5A 0.5A 0 0 5V 5V 0 VIN=5V RL=5Ω 0 2000 VOC VOC 4000 VIN=5V CL=47μF RL=1Ω CL=220μF VOUT 1A 0.5A IOUT IOUT 2000 Thermal Shutdown Response 5V 0 VIN=5V RL=5Ω Time (400μs/div) Inrush Current With Different Load Capacitance 10V 0 0 4000 Time (400μs/div) 0 5V 0 VEN VEN CL=120μF 1A VEN VOC IOUT VEN 5V CL=10μF 1A Inrush Current With Different Load Capacitance 10V 5V 0 10 Time (1ms/div) Inrush Current With Different Load Capacitance 10V 5 VIN=5V RL=5Ω 0 5 10 Time (1ms/div) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 9 QW-R502-423.E US3075-US3375 CMOS IC TYPICAL CHARACTERISTICS (Cont.) VOUT VIN VIN VOUT Short-circuit current, device enable into short Short circuit response at start up CL=47μF IOUT 2A 0 1A 10V 0 5V VOC IOUT 2A 5V 5V VEN 0 VIN 10V 0 0 500 VIN=5V CIN=47μF CL=47μF 0 0 1000 4000 Time (400ms/div) IOUT IOUT VOUT VIN VOC VIN VOUT Time (100ms/div) 2000 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 9 QW-R502-423.E US3075-US3375 CMOS IC TYPICAL CHARACTERISTICS (Cont.) IOUT VIN VOC VOUT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 9 QW-R502-423.E