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UNISONIC TECHNOLOGIES CO., LTD US2075A
DUAL-CHANNEL POWER DISTRIBUTION CONTROL SWITCH FOR USB
DESCRIPTION
The UTC US2075A is a dual channel power switch with independent enable and flag functions, optimized for bus-powered Universal Serial Bus (USB) and self-powered applications. This product satisfies USB voltage drop requirement with soft start, which eliminates the momentary voltage drop on the upstream port that may occur. In addition, the UTC US2075A is equipped with over-temperature and over-current detectors, each flag output is available to indicate fault conditions independently to the USB controller. The UTC US2075A is available in active-low versions in 8-pin SOP package.
CMOS IC
SOP-8
* Pb-free plating product number:US2075AL
FEATURES
* 100 A MAX operating current * 5A MAX standby current * 3.5V ~ 5.5V operating range * Two P-channel power MOSFET control switch * Over-current protection * Under-voltage lockout circuit * Thermal shutdown circuit * Soft-start circuit * Flag indicates fault conditions
ORDERING INFORMATION
Normal US2075A-S08-R US2075A-S08-T Order Number Lead Free Plating US2075AL-S08-R US2075AL-S08-T Package SOP-8 SOP-8 Packing Tape Reel Tube
US2075AL-S08-R (1)Packing Type (2)Package Type (3)Lead Plating (1) R: Tape Reel, T: Tube (2) S08: SOP-8 (3) L: Lead Free Plating, Blank: Pb/Sn
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PIN CONFIGURATION
CMOS IC
EN1
1
8
OUT1
FLAG1
2 UTC US2075A
7
IN
FLAG2
3
6
GND
EN2
4
5
OUT2
PIN DESCRIPTION
PIN NO 1 2 3 4 5 6 7 8 PIN NAME EN1 FLAG1 FLAG2 EN2 OUT2 GND IN OUT1 DESCRIPTION Switch1 Enable input: Logic-compatible, Active-low. TTL input Fault Detection Flag 1 (OUTPUT): Active-low. Nch open-drain. Indicates over-current, thermal shutdown, or UVLO conditions Fault Detection Flag 2 (OUTPUT): Active-low. Nch open-drain. Indicates over-current, thermal shutdown, or UVLO conditions Switch2 Enable input: Logic-compatible. Active-low. TTL input 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
TRUTH TABLE (H: High, L: Low, ON: Turn on, OFF: Turn off, X: H or L)
EN1 (IN) L L H H L L X X FLAG1 (OUT) H H H H L H L L OUT1 (OUT) ON ON OFF OFF ON ON OFF OFF EN2 (IN) L H L H L L X X FLAG2 (OUT) H H H H H L L L OUT2 (OUT) ON OFF ON OFF ON ON OFF OFF Operation Mode Normal Operation Only OUT1 is ON. Only OUT2 is ON. Standby Mode Overcurrent Detection Only for OUT1 Overcurrent Detection Only for OUT2 Thermal Shutdown Circuit Operation Undervoltage Lockout Circuit Operation
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BLOCK DIAGRAM
CMOS IC
FLAG1 EN Control FLAG LOGIC
EN1
OUT1
Gate Control
Current Limit Thermal Shutdown Current Limit
GND
UVLO
IN
Gate Control OUT2 FLAG2 EN Control FLAG LOGIC
EN2
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ABSOLUTE MAXIMUM RATING
CMOS IC
PARAMETER SYMBOL RATINGS Input Voltage VIN -0.3 ~ +6 FLAG Voltage VFLAG -0.3 ~ +6 FLAG Current IFLAG 50 Output Voltage VOUT VIN+0.3 Output Current IOUT -0.1 ~ +0.5 Control Input VEN -0.3 ~ +6 Total Power Dissipation PD 300 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. maximum ratings are stress ratings only and functional device operation is not implied.
UNIT V V mA V A V mW
Absolute
RECOMMENDED OPERATING RANGE
PARAMETER Operating Temperature Thermal Shutdown Protection SYMBOL TOPR TSHDN TEST CONDITIONS Temperature rising Temperature hysteresis MIN 0 TYP 150 5 MAX 80 10 UNIT
DC ELECTRICAL CHARACTERISTICS (VIN=+5V, TOPR=+25 , Unless otherwise specified)
PARAMETER Input Voltage EN Voltage, Low EN Voltage, Low Under-Voltage Lockout SYMBOL TEST CONDITIONS VIN VIL EN pin VIH EN pin VIN=increasing VUVLO VIN=decreasing Hysteresis voltage VEN1=VEN2=GND, ISW_ON VOUT1=VOUT2=Open VEN1=VEN2=VIN, ISW_OFF VOUT1=VOUT2=Open IO(LEAK) I(LEAK) VFLAG=5V ILIMIT TA=0~80 ROUT IL=10mA RON IOUT=500mA MIN 3.5 2.0 2.2 2.0 0.05 TYP 5 MAX 5.5 1.0 2.8 2.6 0.25 100 1 0.01 0.9 10 105 5 10 1 1.25 20 145 UNIT V V V V V V A A A A A m
2.5 2.3
Supply Current Output Leakage Current FLAG Leakage Current Current Limit FLAG Output Resistance Output MOSFET on-Resistance
0.6
AC ELECTRICAL CHARACTERISTICS
PARAMETER SYMBOL TEST CONDITIONS Output Turn-on Rise Time tR RL=10, per output Output Turn-off Fall Time tF RL=10, per output Over-Current Detection Delay Time tDELAY Over-Current Detection Output Rise Time tR RL=10, per output MIN 2.5 TYP 5 20 5 MAX 8 10 8 UNIT ms s s ms
2.5
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TEST CIRCUIT
CMOS IC
VIN
1M
1M
10K
10K
CIN
FLAG1
IN
FLAG2 UTC US2075A EN1 S2 S1 EN2 GND OUT2 CL2 RL2 OUT1 CL1
VOUT1
RL1
VOUT2
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TIMING DIAGRAM
CMOS IC
VIN
tON 90% VOUT 90%
tOFF
10%
VEN
90%
tR 90% VOUT 90%
tF
10%
VEN
IOUT
I LIMIT
VOUT tDELAY VFLAG tR
90%
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FUNCTIONAL DESCRIPTION
CMOS IC
The UTC US2075A is dual P-Channel switch with active-low 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 circuit 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 US2075A 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 US2075A is internally protected against excessive power dissipation by thermal shutdown protection circuit. If device junction temperature rise above approximately 150 , 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 145 . When the thermal shutdown circuit is activated, the output pins are in the OFF status. However, the UTC US2075A 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 2.5V (typical). If input voltage drops below 2.3V (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 10k to input voltage.
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TYPICAL APPLICATION CIRCUIT
3.3V 5V VBUS 1 10k 10k F D+ DFLAG1 Over current FLAG2 USB Controller EN1 Enable disable EN2 DD+ GND OUT2 D150 F GND UTC US2075A 150 F OUT1 VBUS D+ IN GND
CMOS IC
USB Connector
USB Connector
TWO USB output ports controllable by USB controller
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TYPICAL CHARACTERISTICS
Supply Current vs. Input Voltage 90 80
Supply Current (A) )
CMOS IC
Output On -Resistance vs. Input Voltage 140 120 100 80 60 40 20 0 4 4.5 5 5.5 Input Voltage (V) 6
Output On-Resistance (m
70 60 50 40 30 20 10 0 4 4.5 5 5.5 Input Voltage (V) 6
Over-Current Limit vs. Input Voltage 1 0.98
Over-Current Limit (A) EN-Pin Threshold Voltage (V)
EN-Pin Threshold Voltage vs. Input Voltage 1.65 VIH 1.6 1.55 VIL 1.5 1.45 1.4
0.96 0.94 0.92 0.9 0.88 0.86 4 4.5 5 5.5 Input Voltage (V) 6
4
4.5 5 5.5 Input Voltage (V)
6
Turn-On Response (VIN vs. VOUT) T VIN (5V/Div) VIN=5V, C IN=1F, COUT=1F, RL=10 VIN (5V/Div)
Turn-Off Response (VIN vs. VOUT) T
VIN=5V, C IN=1F, COUT=1F, RL=10
VOUT (2V/Div) (2ms/Div)
VOUT (2V/Div) (10ms/Div)
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TYPICAL CHARACTERISTICS(Cont.)
Turn-On Response (VEN vs. VOUT) T VEN (5V/Div) VEN (5V/Div) VIN=5V, CIN=1F, C OUT=1F, RL =10 VIN=5V, CIN=1F, C OUT=1F, R L=10 T
CMOS IC
Turn-Off Response (VEN vs. VOUT)
VOUT (2V/Div) (2ms/Div)
VOUT (2V/Div) (4ms/Div)
FLAG Response (VOUT vs. VFLAG) T
FLAG Response (VOUT vs. VFLAG) T
VOUT (2V/Div)
VIN=5V, CIN=1F, COUT=1F, Current Limit
VOUT (2V/Div)
VIN=5V, CIN=1F, COUT=1F, Short Circuit
VFLAG (2V/Div) (10ms/Div)
VFLAG (2V/Div) (10ms/Div)
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.
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