Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US2175
CMOS IC
DUAL USB HIGH-SIDE POWER
SWITCH

DESCRIPTION
The US2175 is a high-side power switch with two channels. It
particularly designed for the Universal Serial Bus (USB) including
self-powered and bus-powered types. The RDS(ON) of the MOSFET
switch is as low as 110mΩ.
The US2175 incorporates protective functions, such as
overcurrent protection, thermal shutdown and UVLO (UnderVoltage
Lockout) protection circuits. The thermal shutdown function provides
individual control for each switch. An open-drain fault flag playing a
role as the output of an N-channel is also included. Once any error
occurs the fault flag will be in active.
The US2175 can be applied in hot plug in power supplies and
battery charger circuits as well.

SOP-8
FEATURES
* Open-Drain Fault Flag.
* High-Side MOSFET Switch with 5V Input Voltage
* 110mΩ RDS(ON) Meets USB Voltage Drop Requirements for Maximum Transmission Wire Length
* Load Current: 1A
* Output Can be Forced Higher Than Input (Off-State)
* On-State Supply Current: 65μA (TYP.)
* Off-State Supply Current:.1μA (TYP.)
* Current-Limit / Short Circuit Protection and Thermal Shutdown Protection Under Overcurrent Condition
* UVLO Makes the Switch OFF at Start UP
* With Slow Turn ON and Fast Turn OFF
* Enable Active-Low or Active-High

ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
US2175XL-S08-R
US2175XG-S08-R
US2175XL-S08-R
(1)Packing Type
Package
Packing
SOP-8
Tape Reel
(1) R: Tape Reel
(2)Package Type
(2) S08: SOP-8
(3)Lead Free
(3) L: Lead Free, G:Halogen Free
(4)Logic Level Enable Pin
(4) L: Active Low, H: Active High
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Copyright © 2013 Unisonic Technologies Co., Ltd
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

CMOS IC
PIN CONFIGURATION
CTL(1)
1
8
OUT(1)
FLG(1)
2
7
IN
FLG(2)
3
6
GND
CTL(2)
4
5
OUT(2)
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
DESCRIPTION
CTL(1)
Switch A Control Input: Logic-Compatible, Active-Low or Active-High. TTL input
Fault Detection Flag (1) (OUTPUT): Active-Low. N-ch Open-Drain. Indicates
FLG(1)
Over-Current, Thermal Shutdown.
Fault Detection Flag (2) (OUTPUT): Active-Low. N-ch Open-Drain. Indicates
FLG(2)
Over-Current, Thermal Shutdown.
CTL(2)
Switch B Control Input: Logic-Compatible, Active-Low or Active-High. TTL Input
OUT(2) Switch B Output: Drain of MOSFET for Output. Usually, Connected to Load
GND
Power Ground.
IN
Power Supply Input.
OUT(1) Switch A Output: Drain of MOSFET for Output. Usually, Connected to Load
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CMOS IC
BLOCK DIAGRAM
2
FLG(1)
8
OUT(1)
CTL(1) 1
Charge
Pump
Gate
Control
Current
Limit
OSC.
Thermal
Shutdown
7 IN
UVLO
Charge
Pump
Gate
Control
CTL(2)
Current
Limit
4
5
OUT(2)
3
FLG(2)
6
GND
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CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
7
V
Control Input Voltage
VCTL
-0.3~ +6.5
V
Fault Flag Voltage
VFLG
7
V
Power Dissipation (Ta = 25°C)
PD
625
mW
Junction Temperature
TJ
+125
°C
Ambient Operating Temperature
TOPR
-40 ~ +85
°C
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.

THERMAL DATA
PARAMETER
Junction to Ambient (no Heatsink)

SYMBOL
θJA
RATINGS
160
UNIT
°C/W
ELECTRICAL CHARACTERISTICS (VIN=5V, TA=25°C, unless otherwise specified)
PARAMETER
Supply Current
Control Input Voltage
Control Input Current
Control Input Capacitance
Output MOSFET Resistance
Output Turn-On Rise Delay
Output Turn-On Rise Time
Output Turn-Off Delay
Output Turn-Off Fall Time
Output Leakage Current
Current Limit Threshold
Short Current
SYMBOL
IOFF
ION
VIL
VIH
IIL
IIH
CI
RON
TD_ON
TON
TD_OFF
TOFF
II(LEAK)
ILIMIT
ISC
Over Temperature Shutdown Threshold
TSD
Error Flag Output Resistance
RFLG
Error Flag Off Current
UVLO Threshold
IFLG_OFF
VUVLO
UNISONIC TECHNOLOGIES CO., LTD
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TEST CONDITIONS
OUT=Open
OUT=Open
VCTL=Logic “0”
VCTL=Logic “1”
VCTL =Logic “0”
VCTL =Logic “1”
IOUT= 500mA
RL=10Ω each Output
RL=10Ω each Output
RL=10Ω each Output
RL=10Ω each Output
VOUT=4V
VOUT=0V
TJ Increasing
TJ Decreasing
VIN=5V, IL=10mA
VIN=3.3V, IL=10mA
VFLG=5V
VIN Increasing
VIN Decreasing
MIN
2.4
TYP MAX UNIT
1
5
µA
65
100 µA
0.8
V
V
0.01
1
µA
0.01
1
µA
1
pF
110 150 mΩ
40
µS
500
µS
1
20
µS
1
20
µS
0.5
10
µA
1.3
2
A
1
A
135
°C
115
°C
15
80
Ω
20
100
Ω
0.01
1
µA
2.6
V
2.4
V
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CMOS IC
TEST CIRCUITS
RFG
(1)
VIN
CIN
+
(2)
IN
FLG
CTL
VOUT
VCE
VFLG
S1
COUT
GND
VOUT
IOUT
A
+
RL
IL
VRDS(ON)
V
(3)
CIN
+
VOUT
IN
VIN
CTL
VCE
RFG
(4)
IOUT
+
COUT
VIN
CIN
IN
FLG
VFLG
VOUT
CTL
FLG
GND
+
VCE
VOUT
GND
COUT
+
RL
IL
(5)
Note: Above test circuits reflected the graphs shown on “Typical Characteristics” are as follows:
(1) On-State Supply Current vs. Input Voltage & Temperature, Off-State Supply Current vs. Input Voltage & Temperature
(2) Flag Trigger & Release Response, Inrush Current at Start-up
(3) Ramped Load Response, Short-Current Response at Start-up
(4) Thermal Shutdown Response, Turn off Response, Turn on Response
(5) Short Circuit Current Response, Ramped Load Response, Thermal Shutdown Response
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CMOS IC
TYPICAL APPLICATION CIRCUIT
VCC
5.0V
Ferrite
Bead
10k
33μF
10k
4.50V ~ 5.25V
Upstream VBUS
100mA max
VBUS
D+
USB Controller
LR1116B
VBUS
IN
VIN
OUT
+
US2175
0.01μF
ON/OFF
CTL(1)
OUT(1)
Overcurrent
FLG(1)
IN
Overcurrent
FLG(2)
GND
ON
CTL(2)
OUT(2)
33μF
D-
USB
Port1
GND
D+
D-
GND
1μF
1μF
GND
0.1μF
VBUS
GND
D+
+
0.01μF
33μF
D-
USB
Port2
GND
DATA
DATA
(Two Pair)
to USB Controller
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CMOS IC
APPLICATION INFORMATION
Fault Flag
The fault flag mainly protects the system from damage caused by such status as thermal shutdown, overcurrent.
Current Limit
The current limit function prevents both excessive in-rush current caused by the plug-in events and the
short-circuit status for MOSFET switches. The current limit threshold is fixed internally, allowing a 1A minimum
current to flow through the MOSFET switches.
Thermal Shutdown
Both thermal shutdown circuits turn both MOSFET switches off if the temperature rises approximately 135°C, at
the same time FLG pin becomes active. 10°C of hysteresis ensures the MOSFETs will not turn on again until the chip
temperature is reduced to 125°C.
Under overcurrent fault conditions, the thermal shutdown will turn off the MOSFET switch which is in this status
due to temperature rise, the other keeps its state.
Supply Filtering
In order to control supply transients, a bypass capacitor placed between IN pin and GND pin is suggested. 0.1μF
to 1μF is suitable. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply
lead inductance) to damage internal control circuitry.
Transient Requirements
Ferrite beads are recommended in series with all power and ground connector pins to prevent EMI and
excessive in-rush current generated from input capacitance of down stream during a hot plug-in event. The USB
devices support dynamic attachment (hot plug-in) of peripherals. .
Short Circuit Transient
A 33μF/16V tantalum or a 100μF/10V electrolytic capacitor located closely to downstream connector for each
port is recommended to provide transient protection and a bulk capacitance provides the short-term transient current
needed during a hot-attachment event.
Printed Circuit Layout
To meet the requirements for power circuitry of USB printed circuit boards, maximum thermal consumption and
minimum voltage drop and EMI is required.
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On-State Supply Current, ISON(μA)
TYPICAL CHARACTERISTICS
On-State Supply Current, ISON(μA)

CMOS IC
Off-State Supply Current vs. Temperature
Off-State Supply Current vs. Input Voltage
0.9
0.05
0.8
0.04
0.7
0.6
0.03
0.5
0.4
0.02
0.3
0.2
0.01
0.1
0
0
3
4
5
Input Voltage, VDD (V)
6
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-40 -20
0
20
40
60
80 100 120
Temperature (℃)
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CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
Inrush Current at Start-up
VOUT
VOUT
Flag Trigger & Release Response
FLAG
RL=0ΩCOUT=100μF
VOUT
FLAG
IOUT
IOUT
FLAG
VOUT
IOUT
IOUT
CTL
RL=10ΩCOUT=100μF
Turn off Response
FLAG
COUT=100μF
VOUT
VOUT
Thermal Shutdown Response
IOUT
CTL
RL=10Ω
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CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
Turn on Response
RL=10Ω
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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