UNISONIC TECHNOLOGIES CO., LTD US251 Preliminary CMOS IC CURRENT-LIMITED, POWER-DISTRIBUTION SWITCHES DESCRIPTION The UTC US251 is a power distribution switch. It is intended for applications such as USB where heavy capacitive loads and short-circuits are likely to be encountered. This family offers multiple devices with fixed current-limit thresholds for applications between 0.5A and 2A. The RDS(ON) of the MOSFET switch is as low as 80mΩ. OC is open-drain output report over-current or over-temperature event which has deglitch typical 9ms timeout period typically 9ms. The UTC US251 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 US251 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 * Single Power Switch Family * 80-mΩ High-Side MOSFET * Rated currents of 0.5 A, 1 A, 1.5 A, 2 A * Accurate, Fixed, Constant Current Limit * Deglitched Fault Reporting * Output Discharge When Disabled * Reverse Current Blocking * Built-in Softstart ORDERING INFORMATION Ordering Number US251G-xx-AF5-R Package SOT-25 Packing Tape Reel US251G-xx-AF5-R (1)Packing Type (1) R: Tape Reel (2)Package Type (2) AF5: SOT-25 (3)Current Limit (3) 08: 0.8mA, 16: 1.6mA, 22: 2.2mA, 29: 2.9mA (4)Green Package (4) G: Halogen Free and Lead Free www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 5 QW-R129-008.a US251 Preliminary MARKING PIN CONFIGURATION IN EN 4 5 1 2 3 OUT GND OC PIN DESCRIPTION PIN NO. 1 2 PIN NAME OUT GND 3 OC 4 EN or EN IN 5 CMOS IC DESCRIPTION Output MOSFET Source of switch. Ground Open-Drain OC output. Enable input. Make sure EN pin never floating. Power Input Voltage BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R129-008.a US251 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN -0.3 ~ 6 V Enable Input Voltage VEN -0.3 ~ 6 V Flag Voltage VEN -0.3 ~ 6 V Output Voltage VOUT -0.3 ~ 6 V Output Current IOUT Internally Limited A Junction Temperature TJ 150 °C 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. THERMAL DATA PARAMETER Junction to Ambient SYMBOL θJA RATINGS 250 UNIT ℃/W RECOMMENDED OPERATING CONDITIONS PARAMETER Input Voltage, IN SYMBOL VIN TEST CONDITIONS MIN 3.5 TYP MAX 5.5 UNIT V Input Voltage, EN or EN Operating Junction Temperature VEN 0 5.5 V TJ -40 125 °C Sink Current Into FLT IFLT 0 5 mA UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R129-008.a US251 Preliminary CMOS IC ELECTRICAL CHARACTERISTICS (VIN=5V, CIN=COUT=1μF, TA=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS ENABLE INPUT Low VIL VIN=3.5V~5.5V, Switch OFF CTL Threshold High VIH VIN=3.5V~5.5V, Switch ON CTL Input Current II(CTL) VCTL=0V~5.5V UNDER VOLTAGE LOCK Under-Voltage Lockout VUVLO VIN increasing Under-Voltage Hysteresis ∆VUVLO VIN decreasing SUPPLY CURRENT ISW(ON) Switch on, VOUT=OPEN Supply Current Switch off, VOUT=OPEN ISW(OFF) Output Leakage Current IO(LEAK) VCTL=0V, RLOAD=0Ω VOUT=5V, VIN=0V, measure IVOUT Reverse Leakage Current IREV -40°C≤ (TJ, TA)≤85°C, VOUT=5V, VIN=0V, measure IVOUT CURRENT LIMIT US251-08 US251-16 Current Limit ILIMIT US251-22 US251-29 US251-08 VOUT=0V, measured prior US251-16 ISC(FB) Short Circuit Fold-Back Current to thermal shutdown US251-22 US251-29 POWER SWITCH IOUT=0.5A US251-08 IOUT=1.0A US251-16 Switch ON Resistance RDS(ON) IOUT=1.5A US251-22 IOUT=2.0A US251-29 tON(RISE) 10% ~ 90% of VOUT rising Output Turn-ON Rise Time OVER CURRENT FLAG I FLG(OFF) V FLG =5V FLAG OFF Current RFLG ISINK=1mA FLAG Output Resistance FLAG Delay Time tD From fault condition to FLG assertion MIN TYP MAX UNIT 0.8 0.01 V V µA 2.8 0.1 V V 2.0 55 0.1 0.5 0.1 0.6 1.2 1.6 2.3 70 1 10 1 µA µA µA µA 5 µA 0.8 1.6 2.2 2.9 1 1 1 1 1.1 1.9 2.7 3.6 A A A A A A A A 80 80 80 80 400 110 110 110 110 mΩ mΩ mΩ mΩ µs 0.01 20 1 400 µA Ω 10 ms THERMAL SHUTDOWN Thermal Shutdown Protection TSD 130 ℃ Thermal Shutdown Hysteresis ∆TSD 20 ℃ Output Discharge Output Pull-Down Resistance RPD VIN=VOUT=5.0V, disabled UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 400 800 Ω 4 of 5 QW-R129-008.a US251 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT VIN RFLT 10kΩ IN OUT VOUT 150µF 0.1µF Fault Signal OC Control Signal EN of EN GND 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 5 of 5 QW-R129-008.a