US2175LL-S08-R [UTC]
Power Supply Support Circuit;
| 型号： | US2175LL-S08-R |
| 厂家： | 
Unisonic Technologies |
| 描述： | Power Supply Support Circuit |
| 文件： | 总10页 (文件大小：625K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
SOP-8
The US2175 can be applied in hot plug in power supplies and
battery charger circuits as well.
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
Package
SOP-8
Packing
Lead Free
Halogen Free
US2175XG-S08-R
US2175XL-S08-R
Tape Reel
US2175XL-S08-R
(1) R: Tape Reel
(2) S08: SOP-8
(1)Packing Type
(2)Package Type
(3)Lead Free
(3) L: Lead Free, G:Halogen Free
(4) L: Active Low, H: Active High
(4)Logic Level Enable Pin
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US2175
CMOS IC
PIN CONFIGURATION
CTL(1)
1
OUT(1)
IN
8
7
FLG(1)
FLG(2)
CTL(2)
2
3
4
6
5
GND
OUT(2)
PIN DESCRIPTION
PIN NO.
1
PIN NAME
CTL(1)
DESCRIPTION
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
Over-Current, Thermal Shutdown.
2
3
FLG(1)
Fault Detection Flag (2) (OUTPUT): Active-Low. N-ch Open-Drain. Indicates
Over-Current, Thermal Shutdown.
FLG(2)
CTL(2)
4
5
6
7
8
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
IN
Power Ground.
Power Supply Input.
OUT(1) Switch A Output: Drain of MOSFET for Output. Usually, Connected to Load
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US2175
CMOS IC
BLOCK DIAGRAM
2
8
FLG(1)
OUT(1)
CTL(1)
1
Charge
Pump
Gate
Control
Current
Limit
Thermal
Shutdown
7
IN
OSC.
UVLO
Charge
Pump
Current
Limit
Gate
Control
4
CTL(2)
5
3
OUT(2)
FLG(2)
6
GND
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US2175
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VCC
RATINGS
7
UNIT
V
Supply Voltage
Control Input Voltage
VCTL
VFLG
PD
-0.3~ +6.5
7
V
Fault Flag Voltage
V
Power Dissipation (Ta = 25°C)
Junction Temperature
625
mW
°C
°C
°C
TJ
+125
Ambient Operating Temperature
Storage Temperature
TOPR
TSTG
-40 ~ +85
-65~ +150
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
SYMBOL
RATINGS
160
UNIT
°C/W
Junction to Ambient (no Heatsink)
θJA
ELECTRICAL CHARACTERISTICS (VIN=5V, TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
IOFF
TEST CONDITIONS
OUT=Open
MIN TYP MAX UNIT
1
5
µA
Supply Current
ION
OUT=Open
65
100 µA
VIL
VCTL=Logic “0”
VCTL=Logic “1”
VCTL =Logic “0”
VCTL =Logic “1”
0.8
V
V
Control Input Voltage
Control Input Current
VIH
2.4
IIL
0.01
0.01
1
1
1
µA
µA
pF
IIH
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
CI
RON
TD_ON
TON
IOUT= 500mA
110 150 mΩ
RL=10Ω each Output
RL=10Ω each Output
RL=10Ω each Output
RL=10Ω each Output
40
500
1
µS
µS
µS
µS
µA
A
TD_OFF
TOFF
II(LEAK)
ILIMIT
ISC
20
20
10
2
1
0.5
1.3
1
VOUT=4V
VOUT=0V
A
TJ Increasing
TJ Decreasing
VIN=5V, IL=10mA
VIN=3.3V, IL=10mA
VFLG=5V
135
115
15
°C
°C
Ω
Over Temperature Shutdown Threshold
TSD
80
100
1
Error Flag Output Resistance
Error Flag Off Current
UVLO Threshold
RFLG
IFLG_OFF
VUVLO
20
Ω
0.01
2.6
2.4
µA
V
VIN Increasing
VIN Decreasing
V
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US2175
CMOS IC
TEST CIRCUITS
RFG
(1)
(2)
VIN
FLG
VFLG
S1
IN
+
CIN
VOUT
IOUT
A
VOUT
CTL
+
VCE
COUT
IL
RL
GND
VRDS(ON)
V
RFG
(3)
(4)
IOUT
FLG
VOUT
VFLG
VOUT
+
IN
VOUT
IN
+
+
COUT
+
CIN
CIN
VIN
VIN
CTL
CTL
GND
FLG
COUT
IL
RL
GND
VCE
VCE
(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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US2175
CMOS IC
TYPICAL APPLICATION CIRCUIT
VCC
5.0V
Ferrite
Bead
10k
10k
33μF
VBUS
4.50V ~ 5.25V
Upstream VBUS
100mA max
D+
D-
+
USB
Port1
USB Controller
US2175
OUT(1)
LR1116B
IN OUT
0.01μF
33μF
VBUS
D+
VIN
CTL(1)
FLG(1)
ON/OFF
GND
Overcurrent
Overcurrent
IN
GND
0.1μF
D-
GND
FLG(2)
CTL(2)
1μF
1μF
VBUS
GND
ON
OUT(2)
GND
D+
D-
+
USB
Port2
0.01μF
33μF
GND
DATA
DATA
(Two Pair)
to USB Controller
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US2175
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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US2175
CMOS IC
TYPICAL CHARACTERISTICS
Off-State Supply Current vs. Temperature
Off-State Supply Current vs. Input Voltage
0.9
0.8
0.7
0.6
0.5
0.4
0.05
0.04
0.03
0.02
0.3
0.2
0.01
0
0.1
0
-40 -20
0
20 40 60 80 100 120
3
4
5
6
Temperature (℃)
Input Voltage, VDD (V)
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US2175
CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
Flag Trigger & Release Response
Inrush Current at Start-up
RL=0ΩCOUT=100μF
RL=10ΩCOUT=100μF
Turn off Response
Thermal Shutdown Response
COUT=100μF
RL=10Ω
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US2175
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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