Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US2075A
CMOS IC
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.

FEATURES
* 100 μA MAX operating current
* 5μA 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
Ordering Number
US2075AG-S08-R

Package
SOP-8
Packing
Tape Reel
MARKING
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CMOS IC

PIN CONFIGURATION

PIN DESCRIPTION

PIN NO
1
PIN NAME
CTL1
2
FLAG1
3
FLAG2
4
5
6
7
8
CTL2
OUT2
GND
IN
OUT1
DESCRIPTION
Switch1 Control Input: Logic-compatible, active-low. TTL input
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 Control 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 circuit
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)
CTL1
(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
CTL2
(IN)
L
H
L
H
L
L
X
X
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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
Over current Detection Only for OUT1
Over current Detection Only for OUT2
Thermal Shutdown Circuit Operation
Under voltage Lockout Circuit Operation
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
CMOS IC
BLOCK DIAGRAM
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
CMOS IC
ABSOLUTE MAXIMUM RATINGS (TA=25°С)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
-0.3 ~ +6
V
Flag Voltage
VFLAG
-0.3 ~ +6
V
Flag Current
IFLAG
50
mA
Output Voltage
VOUT
VIN+0.3
V
Output Current
IOUT
-0.1 ~ +0.5
A
Control Input
VCTL
-0.3 ~ +6
V
Total Power Dissipation
PD
300
mW
Junction Temperature
TJ
+150
°С
Operating Temperature
TOPR
0 ~ +85
°С
Storage Temperature
TSTG
-55 ~ +150
°С
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 RANGE
PARAMETER
Thermal Shutdown Protection

SYMBOL
TSHDN
TEST CONDITIONS
Temperature Rising
Temperature Hysteresis
TYP
150
5
MAX
10
UNIT
°С
°С
DC ELECTRICAL CHARACTERISTICS (VIN=+5V, TOPR=+25°С, Unless otherwise specified)
PARAMETER
Input Voltage
CTL Voltage, Low
CTL Voltage, High
SYMBOL
TEST CONDITIONS
VIN
VIL
CTL Pin (Note)
VIH
CTL Pin (Note)
VIN=Increasing
Under-Voltage Lockout
VUVLO VIN=Decreasing
Hysteresis Voltage
VCTL=GND
ISW_ON
VOUT1=VOUT2=Open
Supply Current
VCTL= VIN
ISW_OFF
VOUT1=VOUT2=Open
Output Leakage Current
IO(LEAK) VCTL= VIN
Flag Leakage Current
IF(LEAK) VFLAG=5V
Current Limit
ILIMIT
Ta=0~80°С
Flag Output Resistance
ROUT IL=10mA
Output MOSFET on-Resistance
RON
IOUT=500mA
Note: ON is CTL<1.0V and OFF is CTL>2.0V

MIN
MIN
3.5
TYP
5
MAX
5.5
1.0
2.0
2.2
2.0
0.05
2.5
2.3
2.8
2.6
0.25
UNIT
V
V
V
V
V
V
100
μA
1
5
μA
0.1
0.9
10
105
10
1
1.25
20
145
μA
μA
A
Ω
mΩ
MAX
8
10
UNIT
ms
μs
μs
ms
0.8
AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITIONS
Output Turn-on Rise Time
tR
RL=10Ω, Per Output
Output Turn-off Fall Time
tF
RL=10Ω, Per Output
Over-Current Detection Delay Time
tDELAY
Over-Current Detection Output Rise Time
tDECR RL=10Ω, Per Output
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MIN
2.5
TYP
5
2.5
20
5
8
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CMOS IC
TEST CIRCUIT
VIN
1M
1M
10K
CIN
10K
2
FLAG1
3
FLAG2
UTC
US2075A
S2
S1
1
CTL1
4
CTL2
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7
OUT1
8
VOUT1
CL1
GND
6
UNISONIC TECHNOLOGIES CO., LTD
IN
OUT2
RL1
VOUT2
5
CL2
RL2
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CMOS IC
TIMING DIAGRAM
VCTL
ILIMIT
IOUT
VOUT
tDELAY
VFLAG
tDECR
90%
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CMOS IC
FUNCTIONAL DESCRIPTION
The UTC US2075A is dual P-Channel switch with active-low and active-high enabled 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 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 CTL 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 10kΩ to input voltage.
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CMOS IC
TYPICAL APPLICATION CIRCUIT
5V
3.3V
VBUS
1µF
10kΩ
10kΩ
D+
D-
2
IN
FLAG1
7
GND
Over
current
3
FLAG2
UTC
US2075A OUT1
USB
Controller
1
CTL1
4
CTL2
150µF
8
VBUS
Enable
disable
D-
USB
Connector
D+
GND
D+
6
OUT2
5
D-
USB
Connector
150µF
GND
TWO USB output ports controllable by USB controller
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Supply Current, ISW(µA)
Output On-Resistance, RON (mΩ)
TYPICAL CHARACTERISTICS
Over-Current Limit vs. Input Voltage
CTL-Pin Threshold Voltage (V)
1
Over-Current Limit, ILIMIT (A)

CMOS IC
0.98
0.96
0.94
0.92
0.9
0.88
0.86
4
4.5
5
5.5
Input Voltage, VIN (V)
6
CTL-Pin Threshold Voltage vs. Input Voltage
1.65
VIH
1.6
1.55
VIL
1.5
1.45
1.4
4
4.5
5
5.5
Input Voltage, VIN (V)
6
Turn-On Response (VIN vs. VOUT)
Turn-Off Response (VIN vs. VOUT)
T
T
VIN
(5V/Div)
VIN
(5V/Div)
VIN=5V, CIN=1µF,
COUT=1µF, RL=10Ω
VOUT
(2V/Div)
VIN=5V, CIN=1µF,
COUT=1µF, RL=10Ω
VOUT
(2V/Div)
(2ms/Div)
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(10ms/Div)
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CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
Turn-On Response (VCTL vs. VOUT)
Turn-Off Response (VCTL vs. VOUT)
T
T
VCTL
(5V/Div)
VCTL
(5V/Div)
VIN=5V, CIN=1µF,
COUT=1µF, RL=10Ω
VOUT
(2V/Div)
VIN=5V, CIN=1µF,
COUT=1µF, RL=10Ω
VOUT
(2V/Div)
(2ms/Div)
(4ms/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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