Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US3076-US3376
Preliminary
CMOS IC
DUAL USB HIGH-SIDE POWER
SWITCH

DESCRIPTION
The UTC US3076-US3376 is an integrated dual channel for USB
high-side power switch. It particularly designed for self-powered and
bus-powered Universal Serial Bus (USB) applications.
The RDS(ON) of the MOSFET switch is as low as 87mΩ. OC which is
open-drain output report over-current or over-temperature event, has
deglitch timeout period typically 9ms.
The UTC US3076-US3376 incorporates some protection circuits,
such as current limiting circuit with foldback function, thermal shutdown
circuit which is designed to prevent catastrophic switch failure due to
increasing power dissipation when continuous heavy loads or short
circuit occurs. 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 US3076-US3376 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, and
battery-charger circuits.

FEATURES
* Operating on the Range of 3V to 5.5V
* High-Side MOSFET with 87mΩ RDS(ON)
* Quiescent Supply Current: 65μA
* Available with 4 Versions of Current Limits with Foldback
* Rise Time: 400μS (TYP)
* UVLO (Under Voltage Lockout)
* Shutdown Supply Current: 1μA (MAX)
* Reverse Current is not Generated when in Power Off State
* Deglitched Open-Drain Over-Current Flag Output ( OC )

ORDERING INFORMATION
Ordering Number
US3X76XG-S08-R
US3X76XG-SM1-R
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOP-8
MSOP-8
Packing
Tape Reel
Tape Reel
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US3076-US3376
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Preliminary
MARKING
PIN CONFIGURATION
GND 1

CMOS IC
8 OC1
IN 2
7 OUT1
EN1(EN1) 3
6 OUT2
EN2(EN2) 4
5 OC2
PIN DESCRIPTION
PIN NO.
1
PIN NAME
GND
2
IN
3
EN1( EN1 )
4
EN2( EN2 )
5
OC2
6
OUT2
7
OUT1
8
OC1
DESCRIPTION
Ground
Input Supply: Output MOSFET Drain, which also supplies IC's internal circuitry.
Connect to positive supply.
Enable: Logic level enable input of switch 1.
Make sure EN pin never floating.
Enable: Logic level enable input of switch 2.
Make sure EN pin never floating.
Over-Current: Open-Drain OC output of switch 2.
Switch Output: Output MOSFET Source of switch 2.
Typically connect to switched side of load.
Switch Output: Output MOSFET Source of switch 1.
Typically connect to switched side of load.
Over-Current: Open-Drain OC output of switch 1.
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Preliminary
CMOS IC
BLOCK DIAGRAM
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Preliminary
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
+3.0 ~ +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
US3376, IOUT = 1.5A
US3276, IOUT = 1.0A
Output MOS RDS(ON)
US3176, IOUT = 0.5A
US3076, IOUT = 0.3A
Supply Current
IIN
Output Turn-on Rising Time
RL=10Ω, 90% Settling
US3376
ITHD(LIMIT) US3276
Current Limit Threshold
VOUT=4V
US3176
US3076
US3376
VOUT=0V,
US3276
Short-circuit Current
ISC
3V<VIN<5.5 V
US3176
US3076
EN Input Threshold
Shutdown Supply Current
ISHDN
Output Leakage Current
IO(LEAK)
EN=”0”, VOUT=0V
VIN Under Voltage Lockout
VIN Under Voltage Hysteresis
Thermal Limit
Thermal Limit Hysteresis
OC Deglitch
OC assertion or deassertion
OC Output Low Voltage
IOC = 5mA,VIN =3V
OC Off-State Current
VOC = 5V
UNISONIC TECHNOLOGIES CO., LTD
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MIN
3.0
1.5
1.1
0.7
0.5
0.2
0.2
0.2
0.2
1.2
TYP
MAX UNIT
5.5
V
87
103
mΩ
90
400
2
1.5
1
0.75
1.3
1
0.67
0. 5
1.6
150
µA
µs
A
A
A
A
A
A
A
A
V
µA
µA
V
mV
°C
°C
2.1
2.5
200
135
20
5
9
2.8
2.1
1.7
1.4
1.9
1.4
1
0.7
2
1
1
3.0
15
ms
0.2
V
1
µA
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Preliminary
CMOS IC
TEST CIRCUIT
VOUT
IOUT
Device Under Test
OUT
COUT
RL
CL
IL
Current Probe
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TIMING DIAGRAMS
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Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
Power Supply
3V
5.5V
IN
1μF
OC1
OC2
OUT1
0.1μF
EN1(EN1)
EN1(EN1)
Load
OUT2
Load
0.1μF
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22μF
22μF
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Preliminary
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. Current flows through the switch from input to output toward the load
in a typical application. 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 US3376/ US3276/ US3176/ US3076
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 remains 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.
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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www.unisonic.com.tw
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