UNISONIC TECHNOLOGIES CO., LTD US211/A/B/C CMOS IC HIGH-SIDE POWER SWITCHES WITH FLAG DESCRIPTION The UTC US211/A/B/C series are 80mΩ high-side power switches. There’s internal single low voltage N-Channel MOSFET which makes it an ideal for all USB applications. This MOSFET should be driven by a charge pump circuitry inside. Its switch on resistance is as low as 80mΩ which we know specially meets the drop voltage for USB applications. The flag pin can output an open-drain fault flag to next controller. There’re lots internal special ways for protecting the chip’s operation. When in hot-plug events, there’s large current which can create the upstream voltage droop to match the USB’s voltage droop requirements and soft-start for isolating the power source. As soon as the die temperature is higher than 130℃, the internal shutdown circuit will work. Only when there’s a normal input voltage in the VIN pin, the UVLO (under-voltage lockout, 1.3V/2.5V typ.) can make sure the chip is till in the off state. Because of the requirement of USB power the fault current should be ensured less than 0.6A/1.1A (UTC US211/A, single port) and 1.3A /1.5A (UTC US211B/C, dual ports). FEATURES * 80mΩ(Typ) N-Channel MOSFET * Supply Current: – Switch On : 25μA(Typ) – Switch Off : 1μA (Typ) * Load Current 500mA for US211 and 1.0A for US211A/B/C * Input Voltage from 2V ~ 5.5V * In Off-State: Output Voltage can be Higher than Input ORDERING INFORMATION Ordering Number US211XXG-AF5-R www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd Package SOT-25 Packing Tape Reel 1 of 9 QW-R502-A67.C US211/A/B/C CMOS IC MARKING 4 5 Current Code: 1: 0.6A, A: 1.1A, B: 1.3A, C: 1.5A U1 1 G 2 Logic Level Enable Pin 3 PIN CONFIGURATION PIN DESCRIPTION PIN NO 1 2 PIN NAME CTL GND 3 FLG Open-drain fault flag output 4 5 VIN VOUT Power input voltage Output voltage DESCRIPTION Enable Input pin, H: High active, L: Low active Ground BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R502-A67.C US211/A/B/C CMOS IC ABSOLUTE MAXIMUM RATING(TA=25°C, unless otherwise specified) PARAMETER SYMBOL Supply Voltage VCC Input/Output Pins VCTL VCTL V FLG V FLG RATINGS 6.5 +2 ~ +5.5 (Note 2) -0.3~ +6.5 0 ~ +5.5 (Note 2) UNIT V V V V 6.5 V 150 °C Junction Temperature TJ -20 ~ +100 (Note 2) °C Storage Temperature TSTG -65 ~ +150 °C Note: 1. 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. 2. The device is not guaranteed to function when it’s beyond its operating conditions. THERMAL DATA PARAMETER Junction to Ambient Junction to Case SYMBOL θJA θJC RATINGS 260 81 UNIT °C/W °C/W ELECTRICAL CHARACTERISTICS PARAMETER ENABLE INPUT CTL Threshold SYMBOL Low High CTL Input Current UNDER VOLTAGE LOCK Under-Voltage Lockout Under-Voltage Hysteresis SUPPLY CURRENT Supply Current Output Leakage Current CURRENT LIMIT VIL VIH II(CTL) TEST CONDITIONS VIN=2V~5.5V, Switch OFF VIN=2V~5.5V, Switch ON VCTL=0V~5.5V 0.8 VIN increasing VIN decreasing ISW(ON) ISW(OFF) IO(LEAK) Switch on, VOUT=OPEN, VCTL =VIN or GND Switch off, VOUT=OPEN, VCTL =VIN or GND VCTL=0V, RLOAD=0Ω ILIMIT Short Circuit Fold-Back Current ISC(FB) 0.01 V V µA 2.1 0.1 V V 2.0 VUVLO ∆VUVLO Current Limit MIN TYP MAX UNIT 1.0 US211 US211A US211B US211C US211 VOUT=0V, measured prior to US211A thermal shutdown US211B US211C 0.6 1.1 1.3 1.5 25 0.1 0.5 45 1 10 µA µA µA 0.8 1.5 1.7 2.0 0.8 1.0 1.0 1.3 1.1 1.9 2.1 2.4 A A A A A A A A 80 80 400 110 110 mΩ mΩ µs 0.01 1 20 400 µA Ω POWER SWITCH Switch ON Resistance RDS(ON) Output Turn-ON Rise Time OVER CURRENT FLAG FLAG OFF Current FLAG Output Resistance tON(RISE) FLAG Delay Time THERMAL SHUTDOWN Thermal Shutdown Protection Thermal Shutdown Hysteresis IOUT= 500mA IOUT=1.0A 10% ~ 90% of VOUT rising I FLG(OFF) V FLG =5V RFLG ISINK=1mA tD From fault condition to FLG assertion TSD ∆TSD UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw US211 US211A/B/C 2 10 130 20 15 ms °C °C 3 of 9 QW-R502-A67.C US211/A/B/C CMOS IC APPLICATION INFORMATION Input and Output VIN (input) is the power source connection to the internal circuitry and the drain of the MOSFET. VOUT (output) is the source of the MOSFET. In a typical application, current flows through the switch from VIN to VOUT toward the load. Because the MOSFET is bidirectional when on, if VOUT is greater than VIN, current will flow from VOUT to VIN There is no a parasitic body diode of N-MOSFET between the drain and source compared to a normal MOSFET,. The US211 can protect damage from reverse current flow if VOUT being externally forced to a higher voltage than VIN when the output disabled (VEN > 2V). Enable Input The switch will be disabled when the EN pin is in a logic low/high condition. During this condition, the internal circuitry and MOSFET are turned off, reducing the supply current to 0.1μA typical. Floating the EN may cause unpredictable operation. EN should not be allowed to go negative with respect to GND. The EN pin may be directly tied to VIN (GND) to keep the part on. Soft Start for Hot Plug-In Applications When hot-plug events occur, the soft start is used to eliminate the upstream voltage droop due to the inrush current. The soft-start protects power supplies from damage caused by highly capacitive loads. Fault Flag The fault flag is an open-drained output of an N-channel MOSFET. The flag drops low to indicate fault conditions: current limit, thermal shutdown or VOUT < VIN − 1V. In order to reduce energy drain, a large pull-up resistor is required. 100kΩ pull-up resistor is recommended for most applications. In the case of over current condition, the fault flag is active only if the flag response delay time (tD) has elapsed. This ensures that FLG is asserted only upon valid over-current conditions and that erroneous error reporting is eliminated. For example, false over-current conditions may occur during hot-plug events when extremely large capacitive loads are connected and causes a high transient inrush current that exceeds the current limit threshold. The FLG response delay time tD is typically 10ms. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 9 QW-R502-A67.C US211/A/B/C CMOS IC APPLICATION INFORMATION(Cont.) Current Limiting and Short-Circuit Protection The current limit circuit protects the MOSFET switch and the hub downstream port from damage. This circuit can deliver load current up to the current limit threshold of typically 0.8A through the switch of US211, 1.5A for US211A, 1.7A for US211B and 2.0A for US211C. When an enabled switch applies a heavy load or short circuit, a large-desired transient current occurs which can cause the current limit circuit response. If this current becomes higher than the current limit threshold, the devices enter constant current mode until thermal shutdown occurs or the fault is removed. Thermal Shutdown The thermal shutdown circuit is used to prevent damage occurs when the die temperature becomes higher than approximately 130°C. After 20°C of hysteresis, the switch will automatically restart if it enabled. When these devices are disabled or the fault is removed, the output and FLG signal will continue to cycle on and off. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 9 QW-R502-A67.C US211/A/B/C CMOS IC TEST CIRCUIT RFG VIN VIN FLG VFLG S1 UTC US211/A/B/C CI Chip Enable CTL VOUT GND A IOUT VOUT CO RL IL Fig.1 Turn-On & Off Response, Flag Response ISupply A VIN VIN CIN FLG UTC US211/A/B/C Chip Enable VOUT EN VFLG ILEAK AGE A RL GND Fig.2 Supply Current VRDS(ON) V IOUT VOUT VIN VIN CIN Chip Enable UTC US211/A/B/C COUT FLG EN GND Fig.3 On-Resistance UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 9 QW-R502-A67.C US211/A/B/C CMOS IC TEST CIRCUIT RFG VIN VIN FLG VFLG UTC US211/A/B/C CI CTL VCTL GND VOUT VOUT CO RL IL Fig.4 UVLO at Rising & Falling S2 RFG VIN VIN CI FLG VFLG UTC US211/A/B/C CTL GND VOUT VOUT CO IOUT A S3 RL IL Fig.5 Current Limit vs. Input Voltage, Inrush Current Response, Current Limit Transient Response Note: Above test circuits reflected the graphs shown on “Typical Operating Characteristics” are as follows: Fig.1 Turn-On Rising & Falling Time vs. Temperature, Turn-On & Off Response, Flag Response. Fig.2 Supply Current vs. Input Voltage & Temperature, Switch Off Supply Current vs. Temperature, Turn-Off Leakage Current vs. Temperature. Fig.3 On-Resistance vs. Input Voltage & Temperature. Fig.4 EN Threshold Voltage vs. Input Voltage & Temperature, Flag Delay Time vs. Input Voltage & Temperature, UVLO Threshold vs. Temperature, UVLO at Rising & Falling. Fig.5 Current Limit vs. Input Voltage/Temperature, Short Circuit Current Response, Short Circuit Current vs. Temperature, Inrush Current Response, Soft-start Response, Ramped Load Response, Current Limit Transient Response, Thermal Shutdown Response. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 9 QW-R502-A67.C US211/A/B/C CMOS IC TYPICAL APPLICATION CIRCUIT Pull-Up Resistor (10K ~ 100K) RFG Supply Voltage 5V 10K VIN FLG USB Controller Over Current 0.1µF UTC US211/A/B/C 1µF Chip Enable Flag Transient Filtering CTL VBUS D+ DGND VOUT GND 10µF 150µF Ferrite Beades Data Note. A low-ESR 150μF aluminum electrolytic or tantalum between VOUT and GND is strongly recommended to meet the 330mV maximum droop requirement in the hub VBUS. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 9 QW-R502-A67.C US211/A/B/C CMOS IC 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-A67.C