Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US3075-US3375
CMOS IC
POWER DISTRIBUTION SWITCH

DESCRIPTION
The UTC US3075-US3375 is a power distribution switch. It
particularly designed for self-powered and bus-powered Universal
Serial Bus (USB) applications.
SOP-8
The RDS(ON) of the MOSFET switch is as low as 100mΩ. OC is
open-drain output report over-current or over-temperature event
which has deglitch typical 9ms timeout period typically 9ms.
The UTC US3075-US3375 incorporates protection circuits
including current limiting circuit with foldback function, thermal
shutdown circuit designed to prevent catastrophic switch failure due
to increasing power dissipation when continuous heavy loads or short
circuit occurs. Besides, a built-in charge pump is used to drive the
N-channel MOSFET that is free of parasitic body diode to eliminate
any reversed current flow across the switch when it is powered off.
The UTC US3075-US3375 is applied in high-side power
protection switch, USB power management, USB host and
self-powered bubs, USB bus-powered hubs, hot plug-in power
supplies, battery-charger circuits.

TSSOP-8
MSOP-8
FEATURES
* Operating on The Range of 3V to 5.5V
* High-Side MOSFET with 100mΩ RDS(ON) (TYP.)
* Quiescent Supply Current: 65μA
* Available With 4 Versions of Current Limits with Foldback
* Rise Time: 400μS (TYP.)
* UVLO (Under Voltage Lockout)
* Output Shutdown Pull-low Resister
* Shutdown Supply Current: 1μA (MAX.)
* Logic Level Enable Pin, Available with Active-High or Active-Low Version
* Reverse Current is Not Generated when in Power Off State
* Deglitched Open-Drain Over-Current Flag Output ( OC )

ORDERING INFORMATION
Ordering Number
US3X75XG-S08-R
US3X75XG-SM1-R
US3X75XG-P08-R
Package
SOP-8
MSOP-8
TSSOP-8
Packing
Tape Reel
Tape Reel
Tape Reel
(1) R: Tape Reel
US3X75 X G-S08-R
(1) Packing Type
(2) Package Type
(3) Green Package
(4) Logic Level Enable Pin
(5) Output Current
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Copyright © 2015 Unisonic Technologies Co., Ltd
(2) S08: SOP-8, SM1: MSOP-8, P08: TSSOP-8
(3) G: Halogen Free and Lead Free
(4) H: Active High, L: Active Low
(5) 0: 0.5A, 1: 0.7A, 2: 1.1A, 3: 1.5A
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CMOS IC
MARKING
SOP-8/MSOP-8

TSSOP-8
PIN CONFIGURATION
GND 1
8 OUT
IN 2
7 OUT
IN 3
6 OUT
EN(EN) 4

5 OC
PIN DESCRIPTION
PIN NO
1
PIN NAME
GND
DESCRIPTION
Ground
Input Supply: Output MOSFET Drain, which also supplies IC's internal circuitry.
Connect to positive supply.
2,3
IN
4
EN( EN )
5
OC
Over-Current: Open-Drain OC output.
6,7,8
OUT
Switch Output: Output MOSFET Source of switch. Typically connect to switched side
of load.
Enable: Logic level enable input. Make sure EN pin never floating.
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CMOS IC
BLOCK DIAGRAM
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CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
6
V
Output Voltage
VOUT
6
V
Output Current
IOUT
Internally Limited
A
Enable Input
VEN
-0.3 ~ 6
V
Storage Temperature
TSTG
-65~ +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.

OPERATING RATINGS
PARAMETER
Supply Voltage
Ambient Operating Temperature

SYMBOL
VIN
TOPR
RATINGS
+3 ~ +5.5
-40~ +85
UNIT
V
°C
ELECTRICAL CHARACTERISTICS
(VIN=5V, CIN=1µF, COUT=1µF, RL=10Ω, TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Input Voltage
VIN
US3375, IOUT =1.5A
US3275, IOUT=1A
Output MOS RDS(ON)
US3175, IOUT=0.5A
US3075, IOUT=0.3A
Supply Current
IIN
Output Turn-on Rising Time
RL=10Ω, 90% Settling
US3075
US3175
Current Limit Threshold
ITHD(LIMIT)
VOUT=4V
US3275
US3375
US3075
US3175
VOUT=0V,
Short-Circuit Current
ISC
2.7V<V
US3275
IN<5.5 V
US3375
EN Input Threshold
Shutdown Supply Current
ISHDN
Shutdown Pull Low Resistance
Output Leakage Current
IO(LEAK)
EN=”0”, VOUT=0V
VIN Under Voltage Lockout
VIN Under Voltage Hysteresis
Thermal Limit
Thermal Limit Hysteresis
MIN
3
0.5
0.7
1.1
1.5
0.2
0.2
0.2
0.2
1.3
2.2
MAX UNIT
5.5
V
100
130
65
400
0.75
1
1.5
2
0. 5
0.67
1
1.3
1.6
0.1
75
0.5
2.5
200
135
20
µA
µs
A
A
A
A
A
A
A
A
V
µA
Ω
µA
V
mV
°C
°C
OC assertion or deassertion
15
ms
OC Output Low Voltage
IOC = 5mA
0.4
V
OC Off-State Current
VOC = 5V
1
µA
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9
1.4
1.7
2.1
2.8
0.7
1
1.4
1.9
1.8
1
150
1
3
mΩ
OC Deglitch
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4
TYP
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CMOS IC
TEST CIRCUIT
VOUT
IOUT
Device Under Test
OUT
COUT
RL
CL
IL
Current Probe

TYPICAL APPLICATION CIRCUIT
Power Supply
2.7V ~ 5.5V
IN
OC
OUT
1μF
Load
EN(EN)
ON
0.1μF
22μF
OFF
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CMOS IC
FUNCTIONAL DESCRIPTION
Input and Output
IN pin (Input) is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUT pin
(Output) is the source of the output MOSFET. In a typical application, current flows through the switch from input to
output toward the load. Both OUT pins must be connected together to the load.
Thermal Shutdown
Thermal shutdown is designed to prevent this device from being damaged due to excessive power dissipation. It is
used to turn off the output MOSFET when the if the temperature is higher than135°C, 20°C of hysteresis prevents
the switch turn on until the die temperature drops to 115°C. Thermal shutdown circuit functions only when the switch
is enabled.
Under Voltage Lockout
UVLO (Under voltage Lockout) turns off the MOSFET switch once the input voltage falls below 2.3V (TYP.) and if
the input voltage exceeds 2.5V (TYP.), the switch will be turned on. UVLO detection functions only when the switch
is enabled.
Current Limiting
The current limit value is fixed internally, typically 2A, 1.5A, 1A, 0.75A for US3375/ US3275/ US3175/ US3075
respectively. There is foldback of current limit When VOUT is less than 1.5V, there is foldback of current limit.
OC Function
The OC open-drain output is asserted (active low) when an over current or over temperature shutdown condition
is encountered after a 9-ms deglitch timeout. The output keeps asserted until the over current or over temperature
condition is removed.

APPLICATION INFORMATION
Supply Filtering
To avoid supply transients, 1μF bypass capacitor is strongly recommended to located between IN to GND.
Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance)
to damage internal control circuitry.
Input transients value must be not higher than the absolute maximum supply voltage (VIN max = 6V) even for a
short duration.
EN, the Enable Input
The enable pin, EN, must be driven logic high or logic low for a clearly defined input. The input is not allowed to
float, or unpredictable operation may be occurs. EN should not be allowed to go negative with respect to GND.
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CMOS IC
TYPICAL CHARACTERISTICS
(VIN= 5V, 3275H, CIN=1μF, COUT=1μF, VEN=0V, TA=25°C, unless otherwise specified.)
Turn on delay time and rise time
8V
8V
6V
6V
4V
4V
2V
2V
0
0
10V
10V
5V
5V
VIN=5V
CL=120μF
RL=5Ω
0
0
2000
Turn off delay time and fall time
VIN=5V
CL=120μF
RL=5Ω
0
0
4000
VOC
0
IOUT
0.5A
0.5A
0
0
5V
5V
0
VIN=5V
RL=5Ω
0
2000
VOC
VOC
4000
VIN=5V
CL=47μF
RL=1Ω
CL=220μF
VOUT
1A
0.5A
IOUT
IOUT
2000
Thermal Shutdown Response
5V
0
VIN=5V
RL=5Ω
Time (400μs/div)
Inrush Current With Different
Load Capacitance
10V
0
0
4000
Time (400μs/div)
0
5V
0
VEN
VEN
CL=120μF
1A
VEN
VOC
IOUT
VEN
5V
CL=10μF
1A
Inrush Current With Different
Load Capacitance
10V
5V
0
10
Time (1ms/div)
Time (400μs/div)
Inrush Current With Different
Load Capacitance
10V
5
VIN=5V
RL=5Ω
0
5
10
Time (1ms/div)
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CMOS IC
IOUT
IOUT
VOUT
VIN VOC
VIN
VOUT
VEN
VIN
VOC
IOUT
IOUT
VIN
VIN
VOUT
VOUT
TYPICAL CHARACTERISTICS (Cont.)

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CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
IOUT
VIN VOC
VOUT

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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