UNISONIC TECHNOLOGIES CO., LTD US205 Preliminary CMOS IC 100mΩ, 2A SLEW RATE CONTROLLED LOAD SWITCH DESCRIPTION The UTC US205 is a cost-effective, low-voltage, low switch-on resistance (typ. 100mΩ) high-side Power Switch IC. It has a 20μA low quiescent supply current that meets the requirements of battery-powered portable equipment. The UTC US205 incorporates protection circuits, such as an over-current protection circuit, a short fold back circuit, a thermal shutdown circuit and an under-voltage lockout circuit for overall protection. Besides, a slew rate controlled function is embedded for turn-on rising time control. The UTC US205 can be usedin applications, such as Cellular Phones, Digital still Camera, Hot swap Supplies, Notebook Computers, Personal Communication Devices, Personal Digital Assistants and so on. The UTC US205 is available in SOP-8 package. FEATURES * High-Side NMOSFET: 100mΩ (TYP) * Input Voltage Varies From 2.7V to 5.5V * Low Supply Current: 20μA * Over Current Protection * Short Circuit Protection * Under Voltage Lockout * Thermal Protection with Foldback * Slew Rate Limited Turn-On Time 3ms (5V) * Reverse Blocking Current * RoHS Compliant ORDERING INFORMATION Ordering Number Lead Free Halogen Free US205XL-S08-R US205XG-S08-R www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd Package Packing SOP-8 Tape Reel 1 of 5 QW-R502-609.A US205 Preliminary PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 PIN NAME NC VOUT EN 4 GND 5, 6, 7, 8 VIN CMOS IC DESCRIPTION No Internal Connection. Power-Switch Output. Chip Enable (Active High). Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. Power Input Voltage. BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R502-609.A US205 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN 6 V Enable Input Voltage EN -0.3~6 V Power Dissipation, @TA=25°C PD 0.3 W Junction Temperature TJ 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. RECOMMENDED OPERATING CONDITIONS (TA=25°C, unless otherwise specified) (Note) PARAMETER SYMBOL RATINGS Supply Voltage VIN 2.7~5.5 Enable Input Voltage EN 0~5.5 Junction Temperature TJ -40~100 Ambient Temperature TA -40~85 Note: The device is not guaranteed to function outside its operating conditions. UNIT V V °C °C ELECTRICAL CHARACTERISTICS (VIN=5V, CIN=1uF, COUT=0.1uF, TA=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS Operation Voltage VIN Under Voltage Lookout VUVLO VIN Falling Under Voltage Lockout Hysteresis ΔVUVLO Quiescent Current IQ EN=High Off Supply Current ISHDN EN=Low, VOUT=Open Off Switch Current ILEAKAGE EN=Low, VOUT=0 On-Resistance RDS(ON) VIN=3.3V, IOUT=1.3A Current Limiting ILIM VIN=3.3V, VOUT=2.3V VOUT=0V, Measured Prior Short Circuit Current ISC_FB to Thermal Shutdown Thermal shutdown Threshold TSD Thermal shutdown Hysteresis ΔTSD Low VIL VIN=2.7V ~ 5.5V EN Threshold High VIH VIN=2.7V ~ 5.5V Enable Input Leakage IEN VEN=5.5V Output Turn-On Delay Time TD_ON VIN=5V, RLOAD=10Ω Output Turn-On Rise Time TON VIN=5V, RLOAD=10Ω Output Turn-Off Fall Time TD_OFF VIN=5V, RLOAD=10Ω Output Pull-Down Resistance During OFF RDISCHARGE EN=Low UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 2.7 1.3 TYP 1.7 50 20 MAX 5 2.1 1.5 100 2 70 1 1 120 2.5 0.4 0.8 1.5 130 20 0.8 2 1 60 3 4 150 1 100 10 UNIT V V mV μA μA μA mΩ A A °C °C V V μA μs ms μs Ω 3 of 5 QW-R502-609.A US205 Preliminary CMOS IC APPLICATION INFORMATION The UTC US205 is an enable input single N-MOSFET high-side power switches, optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. A charge pump circuitry is contained to drive the internal MOSFET switch, the switch on resistance is 100mΩ, meets USB voltage droop requirements. Input and Output VIN (Input) is both the power supply connection for the internal circuitry driving the switch and the input (Drain connection) of the power MOSFET switch. VOUT (Output) is the Source connection of the MOSFET and supplies power to the load. In a typical circuit, current flows from VIN to VOUT toward the load. Since the switch is bidirectional when enabled, if VOUT is greater than VIN, current will flow through the switch from VOUT to VIN. There is no parasitic body diode between drain and source of the MOSFET, prevents reverse current flow if VOUT is externally forced to a higher voltage than VIN when the chip is disabled (VEN < 0.8V). D S S D G G Normal MOSFET UTC US205 Chip Enable Input If the EN pin is in a logic low condition the UTC US205 switch will be disabled. During this case, MOSFET and the internal circuitry will be turned off, and the supply current is reduced to 0.1uA typical. When the EN is floating, unpredictable operation may be caused. EN goes negative with respect to GND should not be allowed. The EN pin can be directly tied to VIN. Soft Start for Hot Plug-In Applications The UTC US205 “soft-start” feature eliminates the upstream voltage droop caused by the large inrush current during hot-plug events, and effectively isolates the power source from extremely large capacitive load, meets the USB voltage droop requirements. Under-Voltage Lockout The UTC US205 internal Under-voltage lockout (UVLO) circuit prevents the MOSFET switch from turning on until the input voltage exceeds approximately 1.75V. The internal MOSFET switch will be turned off if input voltage drops below approximately 1.7V. Under-voltage detection functions only when the chip is enabled. Current Limiting and Short-Circuit Protection The UTC US205 protects the power supply and the load from damage by the current limit circuitry, but can deliver load current up to the current limit threshold (typically 2A). If an enabled switch encounters a heavy load or short circuit case, a large transient current may flow until the current limit circuitry responds. Once this current limit threshold level is exceeded, the device enters constant current mode until the fault is removed or thermal shutdown occurs. Supply Filter/Bypass Capacitor To prevent the input voltage drooping during hot-plug events, a 1uF low-ESR ceramic capacitor from VIN to GND is strongly recommended. But higher capacitor values will further reduce the voltage droop on the input. Furthermore, without the bypass capacitor, an output short may cause sufficient ringing on the input (from source lead inductance) to destroy the internal circuitry. The input voltage transient must not exceed the absolute maximum supply voltage 6V even for a short duration. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R502-609.A US205 Preliminary CMOS IC APPLICATION INFORMATION(Cont.) Output Filter Capacitor A low-ESR 150uF aluminum electrolytic or tantalum between VOUT and GND is strongly recommended to meet the 330mV maximum droop requirement in the hub VBUS (Per USB 2.0, output ports must have a minimum 120μF of low-ESR bulk capacitance per hub). The bypass capacitor itself should have a low dissipation factor to allow decoupling at higher frequencies. Thermal Shutdown Thermal shutdown is used to turn off the output MOSFET when the if the temperature is higher than130°C, 20°C of hysteresis prevents the switch turn on until the die temperature drops to 110°C. TYPICAL APPLICATION CIRCUIT 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-R502-609.A