UNISONIC TECHNOLOGIES CO., LTD US2026A CMOS IC DUAL-CHANNEL USB POWER SWITCH AND OVER-CURRENT PROTECTION DESCRIPTION The UTC US2026A is a standard dual channels power switch with independent over-current protection fault flag functions, optimized for bus-powered Universal Serial Bus (USB) and self-powered applications, including Notebook and desktop PC’s that supply power to more than one port. The UTC US2026A also offers thermal shutdown protection that reduces current consumption in fault modes for each switch and the entire device. With a 1ms delay on the fault FLAG output prevents erroneous over current reporting caused by in-rush currents during hot-plug events. In addition, the UTC US2026A employs soft-start circuitry that minimizes in-rush current in applications where highly capacitive loads are employed. SOP-8 *Pb-free plating product number: US2026AL FEATURES * Two P-channel power MOSFET control switch * 110µA Max operating current * 5µA Max standby current * 145 mΩ Max switch resistance * 2.7V ~ 5.5V input voltage range * 500mA minimum continuous load current * Smooth turn-on eliminates in-rush induced voltage drop * 1 ms fault flag delay filters Hot-Plug events * Over-current protection * Under-voltage lockout circuit * Thermal shutdown protection * Flag indicates fault conditions ORDERING INFORMATION Ordering Number Normal Lead Free Plating US2026A-S08-R US2026AL-S08-R US2026A-S08-T US2026AL-S08-T www.unisonic.com.tw Copyright © 2007 Unisonic Technologies Co., Ltd Package Packing SOP-8 SOP-8 Tape Reel Tube 1 of 11 QW-R502-086.B US2026A CMOS IC PIN CONFIGURATIONS EN1 1 FLAG1 2 FLAG2 3 EN2 4 UTC US2026A 8 OUT1 7 IN 6 GND 5 OUT2 PIN DESCRIPTION PIN NO 1 PIN NAME EN1 2 FLAG1 3 FLAG2 4 5 6 7 8 EN2 OUT2 GND IN OUT1 DESCRIPTION Switch1 Enable input: Logic-compatible enables inputs Fault Detection Flag 1 (OUTPUT): Active-low. N-ch open-drain. Indicates over-current, thermal shutdown, or UVLO conditions Fault Detection Flag 2 (OUTPUT): Active-low. N-ch open-drain. Indicates over-current, thermal shutdown, or UVLO conditions Switch2 Enable input: Logic-compatible enables inputs Switch2 OUTPUT: Drain of MOSFET for Output. Usually, connected to Load Ground Power input: Source of MOSFET for Output. Power Supply to Internal Circuitry of IC Switch1 OUTPUT: Drain of MOSFET for Output. Usually, connected to Load UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 11 QW-R502-086.B US2026A CMOS IC BLOCK DIAGRAM FLAG1 FLAG Logic EN1 EN Control OUT1 GATE Control Thermal Shutdown Current Limit GND IN Current Limit UVLO GATE Control OUT2 EN2 EN Control FLAG2 FLAG Logic UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 11 QW-R502-086.B US2026A CMOS IC ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN -0.3 ~ +6 V Output Voltage VOUT -0.3 ~ +6 V Voltage at All Other Pins VOTHER -0.3 ~ +6 V Total Power Dissipation PD 300 mW Junction Temperature TJ +150 ℃ Operating Temperature TOPR -40 ~ +85 ℃ Storage Temperature TSTG -55 ~ +150 ℃ 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 OPERATION CONDITIONS PARAMETER Supply Voltage Range Operating Temperature SYMBOL VIN TOPR RATINGS +2.7 ~ +5.5 0 ~ +70 UNIT V ℃ ELECTRICAL CHARACTERISTICS (TJ = 25°C, VIN = 5.0V, VEN = 0V, unless otherwise specified.) PARAMETER DC CHARACTERISTIC EN Input Logic SYMBOL High Low Under-Voltage Lockout Threshold OUT Pins Continuous Output Current Over-Current Threshold OUT Pins Output Leakage Current EN Leakage Current OFF Supply Current ON Error FLAG Leakage Current VIH VIL VUVLO IOUT THDOC ILEAK IEN IO(OFF) IO(ON) IFH On Resistance RON FLAG Output Voltage RFO Over-Temperature Shutdown Threshold THDOT TEST CONDITIONS MIN TYP (Note 1) (Note 1) VIN=increasing Hysteresis voltage 2.4 1.7 1.6 2.3 100 Each Output 0.5 VEN = VIN VEN = 0V or VEN = VIN Switch-Off Switch-On VFLAG = 5V VIN = 5V, IOUT = 500mA, each switch VIN = 2.7V, IOUT = 500mA, each switch IFO = 10 mA, VIN = 5.0V IFO = 10 mA, VIN = 3.3V IFO = 10 mA, VIN = 2.7V TJ Increasing, with no shorted output TJ Increasing, with shorted output (s) TJ Decreasing (Note 2) AC CHARACTERISTIC Over Current Flag Delay tOC RL = 0 OUT Rise Time tR RL = 10Ω OUT Fall Time tF RL = 10Ω Turn on Delay, EN to OUT tON RL = 10Ω Turn off Delay, EN to OUT tOFF RL = 10Ω Note: 1. OFF is EN ≥ 2.4V and ON is EN ≤ 0.8V. 2. Thermal Shutdown will protect the device from permanent damage. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MAX UNIT 0.8 2.7 V V V mV A 1.5 0.01 -0.5 1 0.01 105 135 10 11 12 155 145 135 1 160 5 240 5 2.2 10 0.5 5 110 1 145 180 20 30 40 A µA µA µA µA µA mΩ Ω °C ms µs µs µs µs 4 of 11 QW-R502-086.B US2026A CMOS IC TEST CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 11 QW-R502-086.B US2026A CMOS IC TIMING DIAGRAM 90% VIN VEN tRISE tOFF tON 90% VOUT tFALL 90% 90% 10% 90% 10% VOUT VEN VEN Standby Status Current Limit VOUT IOUT Short Circuit VFLAG VOUT Operating temperature rising Operating temperature falling TJ VFLAG UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 11 QW-R502-086.B US2026A CMOS IC FUNCTIONAL DESCRIPTION The UTC US2026A is dual P-Channel switches with active-low and active-high enable inputs, respectively. Fault conditions (such as UVLO, thermal shutdown and over-current) that appear will turn off the power switch, and the FLAG pin will go low. Of course, the two internal FLAG circuits also operate respectively. Input and Output IN (Input) is the power supply connection to the control circuitry and the source of the output MOSFET. OUTX (Output) is the connection to the drain of the output MOSFET. In a typical application circuit, current flows through the switch from IN to OUTX towards the load. If VOUT is greater than VIN when the switch is enabled, current will flow from OUTX to IN since the MOSFET is bi-directional. Power ON and OFF The UTC US2026A performs a soft-start operation on power application, which is to prevent an over-current or inrush-current from flowing through the switch from IN to OUTX towards to the load, while the high-capacity capacitor is connected to the OUTX. Thermal Shutdown The UTC US2026A is internally protected against excessive power dissipation by thermal shutdown protection circuit. If device junction temperature rise above approximately 145℃, both switches are turned off, both fault FLAG outputs are activated, and they goes low. Hysteresis ensures that both switches turned off by thermal shutdown will not be turned on again until the die temperature is reduced to 135℃. When the thermal shutdown circuit is activated, the output pins are in the OFF status. However, the UTC US2026A enters the standby status when EN pins are all inactive. Current Limit The current limit circuit is designed to protect the output MOSFET, the load and the IC supply from damage caused by excessive currents. The current limit threshold is preset internally, If an over-current is detected, the IC performs a slow-start operation again, it is assumed that output is short circuit, and FLAG pin will go low, FLAG output is available to indicate fault conditions independently to the USB controller. Under-Voltage Lockout UVLO prevents the output MOSFET switch from turning on until input voltage exceeds 2.3V (typical). If input voltage drops below 2.2V (typical), UVLO shuts off the both output MOSFET switches and signals the FLAG. Fault FLAG The fault FLAG is an output with open-drain of N-channel. The fault FLAG is pulled down when any of the conditions such as under-voltage, current limit and thermal shutdown. In a typical application circuit, the FALG pin has a pull-up resistor of 10kΩ to input voltage. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 11 QW-R502-086.B US2026A CMOS IC TYPICAL APPLICATION CIRCUIT USB Port US2026A 5V 1µF IN 10kΩ VBUS OUT1 D+ 150µF 10kΩ DGND USB Controller Over-Current ON/OFF EN1 USB Port FLAG2 Over-Current D+ D- DATA FLAG1 ON/OFF EN2 GND OUT2 VBUS D+ 150µF D- DATA GND DATA UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 11 QW-R502-086.B US2026A CMOS IC FLAG On-Resistance (Ω) Output On-Resistance (mΩ) TYPICAL CHARACTERISTICS (TJ = 25℃, VIN = 5.0V, unless otherwise specified) 2.1 Over-Current Limit vs. Input Voltage 1.9 1.8 EN Threshold Voltage (V) Over-Current Limit (A) 1.8 1.5 1.2 0.9 0.6 0.3 0 2.5 EN Threshold Voltage vs. Input Voltage 1.7 VIH 1.6 VIL 1.5 1.4 1.3 3.0 3.5 4.0 4.5 5.0 Input Voltage (V) 5.5 6.0 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 1.2 2.5 3.0 3.5 4.0 4.5 5.0 Input Voltage (V) 5.5 6.0 9 of 11 QW-R502-086.B US2026A CMOS IC TYPICAL CHARACTERISTICS(Cont.) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 11 QW-R502-086.B US2026A 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 11 of 11 QW-R502-086.B