US2026A-S08-R [UTC]
DUAL-CHANNEL USB POWER SWITCH AND OVER-CURRENT PROTECTION; 双通道USB电源开关和过流保护
| 型号： | US2026A-S08-R |
| 厂家： | 
Unisonic Technologies |
| 描述： | DUAL-CHANNEL USB POWER SWITCH AND OVER-CURRENT PROTECTION |
| 文件： | 总11页 (文件大小：225K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
US2026A
CMOS IC
DUAL-CHANNEL USB POWER
SWITCH AND OVER-CURRENT
PROTECTION
DESCRIPTION
The UTC US2026A is a standard dual channels power switch with
independent over-current protection fault flag functions, optimized for
bus-powered Universal Serial Bus (USB) and self-powered
applications, including Notebook and desktop PC’s that supply
power to more than one port.
SOP-8
The UTC US2026A also offers thermal shutdown protection that
reduces current consumption in fault modes for each switch and the
entire device. With a 1ms delay on the fault FLAG output prevents
erroneous over current reporting caused by in-rush currents during
hot-plug events.
*Pb-free plating product number: US2026AL
In addition, the UTC US2026A employs soft-start circuitry that
minimizes in-rush current in applications where highly capacitive
loads are employed.
FEATURES
* Two P-channel power MOSFET control switch
* 110µA Max operating current
* 5µA Max standby current
* 145 mΩ Max switch resistance
* 2.7V ~ 5.5V input voltage range
* 500mA minimum continuous load current
* Smooth turn-on eliminates in-rush induced voltage drop
* 1 ms fault flag delay filters Hot-Plug events
* Over-current protection
* Under-voltage lockout circuit
* Thermal shutdown protection
* Flag indicates fault conditions
ORDERING INFORMATION
Ordering Number
Package
Packing
Normal
Lead Free Plating
US2026A-S08-R
US2026A-S08-T
US2026AL-S08-R
US2026AL-S08-T
SOP-8
SOP-8
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2007 Unisonic Technologies Co., Ltd
1 of 11
QW-R502-086.B
US2026A
CMOS IC
PIN CONFIGURATIONS
1
2
3
4
8
7
6
5
OUT1
IN
EN1
FLAG1
UTC
US2026A
FLAG2
EN2
GND
OUT2
PIN DESCRIPTION
PIN NO
PIN NAME
EN1
DESCRIPTION
Switch1 Enable input: Logic-compatible enables inputs
Fault Detection Flag (OUTPUT): Active-low. N-ch open-drain. Indicates
over-current, thermal shutdown, or UVLO conditions
Fault Detection Flag (OUTPUT): Active-low. N-ch open-drain. Indicates
1
1
2
FLAG1
FLAG2
2
3
over-current, thermal shutdown, or UVLO conditions
4
5
6
7
8
EN2
OUT2
GND
IN
Switch2 Enable input: Logic-compatible enables inputs
Switch2 OUTPUT: Drain of MOSFET for Output. Usually, connected to Load
Ground
Power input: Source of MOSFET for Output. Power Supply to Internal Circuitry of IC
Switch1 OUTPUT: Drain of MOSFET for Output. Usually, connected to Load
OUT1
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US2026A
CMOS IC
BLOCK DIAGRAM
FLAG1
FLAG Logic
EN1
EN Control
OUT1
GATE
Control
Thermal
Shutdown
Current
Limit
GND
IN
Current
Limit
UVLO
GATE
Control
OUT2
EN2
EN Control
FLAG2
FLAG Logic
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US2026A
CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VIN
RATINGS
-0.3 ~ +6
-0.3 ~ +6
-0.3 ~ +6
300
UNIT
V
Supply Voltage
Output Voltage
VOUT
VOTHER
PD
V
Voltage at All Other Pins
Total Power Dissipation
Junction Temperature
Operating Temperature
Storage Temperature
V
mW
℃
TJ
+150
TOPR
TSTG
-40 ~ +85
-55 ~ +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.
RECOMMENDED OPERATION CONDITIONS
PARAMETER
SYMBOL
RATINGS
+2.7 ~ +5.5
0 ~ +70
UNIT
V
Supply Voltage Range
Operating Temperature
VIN
TOPR
℃
ELECTRICAL CHARACTERISTICS (TJ = 25°C, VIN = 5.0V, VEN = 0V, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
DC CHARACTERISTIC
High
Low
VIH
VIL
(Note 1)
(Note 1)
2.4
1.7
1.6
2.3
100
V
V
EN Input Logic
0.8
2.7
VIN=increasing
V
Under-Voltage Lockout Threshold
VUVLO
IOUT
Hysteresis voltage
mV
OUT Pins Continuous Output
Current
Each Output
0.5
A
Over-Current Threshold
OUT Pins Output Leakage Current
EN Leakage Current
THDOC
ILEAK
IEN
1.5
2.2
10
0.5
5
A
VEN = VIN
0.01
µA
µA
µA
µA
µA
VEN = 0V or VEN = VIN
Switch-Off
-0.5
OFF
IO(OFF)
IO(ON)
IFH
1
Supply Current
ON
Switch-On
110
1
Error FLAG Leakage Current
VFLAG = 5V
0.01
VIN = 5V, IOUT = 500mA, each switch
105 145
135 180
On Resistance
RON
mΩ
VIN = 2.7V, IOUT = 500mA, each switch
IFO = 10 mA, VIN = 5.0V
10
11
20
30
40
FLAG Output Voltage
RFO
Ω
IFO = 10 mA, VIN = 3.3V
IFO = 10 mA, VIN = 2.7V
12
TJ Increasing, with no shorted output
155
145
135
Over-Temperature Shutdown
Threshold
THDOT TJ Increasing, with shorted output (s)
TJ Decreasing (Note 2)
°C
AC CHARACTERISTIC
Over Current Flag Delay
OUT Rise Time
tOC
tR
RL = 0
1
160
5
ms
µs
µs
µs
µs
RL = 10Ω
RL = 10Ω
RL = 10Ω
RL = 10Ω
OUT Fall Time
tF
Turn on Delay, EN to OUT
Turn off Delay, EN to OUT
tON
tOFF
240
5
Note: 1. OFF is EN ≥ 2.4V and ON is EN ≤ 0.8V.
2. Thermal Shutdown will protect the device from permanent damage.
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US2026A
CMOS IC
TEST CIRCUIT
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US2026A
CMOS IC
TIMING DIAGRAM
90%
VIN
VEN
tRISE
tFALL
tOFF
tON
90%
90%
90%
90%
10%
VOUT
VOUT
10%
VEN
VEN
Standby Status
Current Limit
VOUT
IOUT
Short Circuit
VFLAG
VOUT
Operating
temperature rising
Operating
temperature falling
TJ
VFLAG
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US2026A
CMOS IC
FUNCTIONAL DESCRIPTION
The UTC US2026A is dual P-Channel switches with active-low and active-high enable inputs, respectively. Fault
conditions (such as UVLO, thermal shutdown and over-current) that appear will turn off the power switch, and the
FLAG pin will go low. Of course, the two internal FLAG circuits also operate respectively.
Input and Output
IN (Input) is the power supply connection to the control circuitry and the source of the output MOSFET. OUTX
(Output) is the connection to the drain of the output MOSFET. In a typical application circuit, current flows through
the switch from IN to OUTX towards the load. If VOUT is greater than VIN when the switch is enabled, current will flow
from OUTX to IN since the MOSFET is bi-directional.
Power ON and OFF
The UTC US2026A performs a soft-start operation on power application, which is to prevent an over-current or
inrush-current from flowing through the switch from IN to OUTX towards to the load, while the high-capacity
capacitor is connected to the OUTX.
Thermal Shutdown
The UTC US2026A is internally protected against excessive power dissipation by thermal shutdown protection
circuit. If device junction temperature rise above approximately 145℃, both switches are turned off, both fault FLAG
outputs are activated, and they goes low. Hysteresis ensures that both switches turned off by thermal shutdown will
not be turned on again until the die temperature is reduced to 135℃. When the thermal shutdown circuit is activated,
the output pins are in the OFF status. However, the UTC US2026A enters the standby status when EN pins are all
inactive.
Current Limit
The current limit circuit is designed to protect the output MOSFET, the load and the IC supply from damage
caused by excessive currents. The current limit threshold is preset internally, If an over-current is detected, the IC
performs a slow-start operation again, it is assumed that output is short circuit, and FLAG pin will go low, FLAG
output is available to indicate fault conditions independently to the USB controller.
Under-Voltage Lockout
UVLO prevents the output MOSFET switch from turning on until input voltage exceeds 2.3V (typical). If input
voltage drops below 2.2V (typical), UVLO shuts off the both output MOSFET switches and signals the FLAG.
Fault FLAG
The fault FLAG is an output with open-drain of N-channel. The fault FLAG is pulled down when any of the
conditions such as under-voltage, current limit and thermal shutdown. In a typical application circuit, the FALG pin
has a pull-up resistor of 10kΩ to input voltage.
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US2026A
CMOS IC
TYPICAL APPLICATION CIRCUIT
US2026A
USB Port
5V
1µF
IN
VBUS
D+
OUT1
150µF
10kΩ
10kΩ
D-
GND
USB Controller
Over-Current
ON/OFF
DATA
FLAG1
EN1
USB Port
Over-Current
FLAG2
EN2
ON/OFF
D+ D-
OUT2
VBUS
D+
GND
150µF
D-
DATA
GND
DATA
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US2026A
CMOS IC
TYPICAL CHARACTERISTICS (TJ = 25℃, VIN = 5.0V, unless otherwise specified)
Over-Current Limit vs. Input Voltage
EN Threshold Voltage vs. Input Voltage
2.1
1.8
1.9
1.8
1.5
1.2
0.9
0.6
1.7
1.6
1.5
1.4
VIH
VIL
0.3
0
1.3
1.2
2.5
3.0
3.5
4.0
Input Voltage (V)
2.5
3.0
3.5
4.0
Input Voltage (V)
4.5
5.0
6.0
4.5
5.0
6.0
5.5
5.5
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US2026A
CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
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US2026A
CMOS IC
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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