US3X77_15 [UTC]
POWER DISTRIBUTION SWITCH;
| 型号： | US3X77_15 |
| 厂家： | 
Unisonic Technologies |
| 描述： | POWER DISTRIBUTION SWITCH |
| 文件： | 总10页 (文件大小：607K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
US3X77
CMOS IC
POWER DISTRIBUTION SWITCH
DESCRIPTION
The UTC US3X77 is a power distribution switch and particularly
designed for self-powered and bus-powered Universal Serial Bus
(USB) applications.
The UTC US3X77 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 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 US3X77 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.
FEATURES
* 100mΩ High-Side MOSFET
* Supply Current:
Switch on : 65μA(Typ)
Switch off : 1μA (Max)
* Accurate Current Limit with Foldback
* Deglitched Open-Drain Over-Current Flag Output (OC)
* No Reverse Current when Power Off
* Under voltage Lockout
* Operating Range:2.7V ~ 5.5V
* Output Shutdown Pull-low Resistor
ORDERING INFORMATION
Ordering Number
Lead Free
Package
Packing
Halogen Free
US3X77XL-S08-R
US3X77XG-S08-R
US3X77XG-S08-T
SOP-8
SOP-8
Tape Reel
Tube
US3X77XL-S08-T
US3X77XL-SM1-R
US3X77XL-SM1-T
US3X77XG-SM1-R
US3X77XG-SM1-T
MSOP-8
MSOP-8
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
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US3X77
CMOS IC
PIN CONFIGURATION
1
2
3
4
8
7
6
5
OUT
OUT
NC
GND
IN
IN
EN(EN)
OC
PIN DESCRIPTION
PIN NO.
PIN NAME
GND
DESCRIPTION
1
Ground
Input Supply: Output MOSFET Drain, which also supplies IC's internal circuitry.
Connect to positive supply.
2, 3
IN
4
5
6
EN(EN)
OC
Enable: Logic level enable input. Make sure EN pin never floating.
Over-Current: Open-Drain OC output.
NC
No connection.
Switch Output: Output MOSFET Source of switch. Typically connect to switched side of
load.
7, 8
OUT
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US3X77
CMOS IC
BLOCK DIAGRAM
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US3X77
CMOS IC
ABSOLUTE MAXIMUM RATING (TA = 25°C, unless otherwise specified)
PARAMETER
SYMBOL
VIN
RATINGS
UNIT
V
Supply Voltage
Output Voltage
Enable Input
6
VOUT
VEN
6
-0.3 ~ 6
Internally Limited
-65~ +150
260
V
V
Output Current
Storage Temperature
IOUT
A
TSTG
℃
℃
kV
Reflow Temperature (Soldering, 10sec)
ESD Protection
2
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
SYMBOL
VIN
RATINGS
+3 ~ +5.5
-40 ~ +85
UNIT
V
Supply Voltage
Operating Temperature
TA
°C
ELECTRICAL CHARACTERISTICS
(VIN = 5V, CIN=1µF, COUT=1µF, RL=10Ω, TA = 25°C, unless otherwise specified)
PARAMETER
Input Voltage
SYMBOL
VIN
TEST CONDITIONS
MIN
2.7
TYP MAX UNIT
5.5
V
US3477, IOUT=1.5A
US3377, IOUT=1.0A
US3277, IOUT=0.5A
US3177, IOUT=0.3A
Output MOS RDS(ON)
100 115 mΩ
Supply Current
IIN
65
400
2.5
2
µA
µs
Output Turn-on Rising Time
RL=10Ω, 90% Settling
US3477
2
1.6
1.2
0.75
0.2
0.2
0.2
0.2
1
3.3
2.6
1.9
1.45
2.3
1.7
1.3
0.9
1.8
1
US3377
VOUT=4V
US3277
Current Limit Threshold
Short-Circuit Current
ITHD(LIMIT)
A
A
1.5
1
US3177
US3477
1.7
1.3
1
US3377
US3277
US3177
V
OUT=0V,
ISC
2.7V<VIN<5.5V
0.7
1.6
0.1
75
EN Input Threshold
V
µA
Ω
Shutdown Supply Current
Shutdown Pull Low Resistance
Output Leakage Current
VIN Under Voltage Lockout
VIN Under Voltage Hysteresis
Thermal Limit
ISHDN
150
1
IO(LEAK)
EN=”0”, VOUT=0V
0.5
2.5
200
135
20
µA
V
2.2
4
2.7
mV
℃
℃
ms
V
Thermal Limit Hysteresis
OC Deglitch
OC assertion or deassertion
IOC= 5mA
9
15
0.4
1
OC Output Low Voltage
OC Off-State Current
VOC = 5V
µA
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US3X77
CMOS IC
FUNCTIONAL DESCRIPTION
OVERCURRENT PROTECTION
When the output load exceeds the current-limit threshold, The Over Current Protection will be triggered. The
typical current limit value of UTC US3077/US3277/US3377/US3477 is 1A, 1.5A, 2A, 2.5A. There is foldback of
current limit when short-circuit being encountered.
OC RESPONSE
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.
THERMAL SHUTDOWN
Thermal shutdown protects UTC US3X77 from excessive power dissipation. If the die temperature exceeds 135°C,
the MOSFET switch is shut off. 20°C of hysteresis prevents the switch from turning on until the die temperature
drops to 115°C. Thermal shutdown circuit functions only when the switch is enabled.
UNDERVOLTAGE LOCKOUT (UVLO)
UVLO (under-voltage lockout) prevents the output MOSFET from turning on until IN (input voltage) exceeds 2.5V
typically. After the switch turns on, if the voltage drops below 2.3V typically, UVLO shuts off the output MOSFET.
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US3X77
CMOS IC
TEST CIRCUITS
RFG
VIN
IN
OC
VFLG
UTC
US3X77
S1
A
CI
VOUT
Chip
OUT
EN
Enable
IOUT
GND
IL
CO
RL
Turn-On & Off Response, Flag Response
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CMOS IC
TYPICAL APPLICATION CIRCUIT
Pull-Up Resistor (10K ~ 100K)
RFG
USB
Flag Transient Filtering
10K
Controller
Supply Voltage 5V
Over -
Current
IN
OC
0.1µF
UTC
US3X77
1µF
VBUS
D+
D-
EN
OUT
Chip Enable
0.1µF
GND
150µF
GND
Data
Ferrite Beades
Note. A low-ESR 150μF aluminum electrolytic or tantalum between VOUT and GND is strongly recommended to meet
the 330mV maximum droop requirement in the hub VBUS
.
POWER SUPPLY CONSIDERATIONS
A 1μF bypass capacitor on IN pins, a high value capacitor and a 0.1uF bypass capacitor on OUT pins， are
strongly recommended， because this precaution can reduce a poor risk that an output short may cause
sufficient ringing on the input to damage internal control circuitry.
Input transients must not exceed the absolute maximum supply voltage (6V) even for a short duration.
ENABLE INPUT
EN must be driven logic high or logic low for a clearly defined input. Floating the input may cause unpredictable
operation. EN should not be allowed to go negative with respect to GND.
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CMOS IC
TYPICAL CHARACTERISTICS
(TA=25°C, VIN= 5V, 3275H, CIN=1μF, COUT=1μF, VEN=0V, unless otherwise specified.)
Turn on delay time and rise time
Turn off delay time and fall time
8V
6V
8V
6V
4V
2V
VIN=5V
CL=120μF
RL=5Ω
4V
2V
0
10V
5V
0
10V
5V
0
VIN=5V
CL=120μF
RL=5Ω
0
0
2000
4000
0
5
10
Time (400μs/div)
Time (1ms/div)
Inrush Current With Different
Load Capacitance
Inrush Current With Different
Load Capacitance
10V
5V
10V
5V
0
0
CL=120μF
CL=10μF
1A
1A
0.5A
0.5A
0
0
5V
5V
0
0
VIN=5V
RL=5Ω
VIN=5V
RL=5Ω
0
2000
4000
0
2000
4000
Time (400μs/div)
Time (400μs/div)
Inrush Current With Different Load Capacitance
10V
Thermal Shutdown Response
VIN=5V
CL=47μF
RL=1Ω
5V
0
CL=220μF
1A
0.5A
0
5V
0
VIN=5V
RL=5Ω
0
5
10
Time (1ms/div)
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US3X77
CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
Short-circuit current, device
enable into short
Short circuit response at start up
CL=47μF
2A
0
2A
1A
0
VIN=5V
CIN=47μF
CL=47μF
10V
5V
0
10V
5V
0
5V
0
0
500
1000
0
2000
Time (400ms/div)
4000
Time (100ms/div)
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US3X77
CMOS IC
TYPICAL CHARACTERISTICS (Cont.)
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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