Datasheet

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.
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.
In addition, the UTC US2026A employs soft-start circuitry that
minimizes in-rush current in applications where highly capacitive
loads are employed.
„
SOP-8
*Pb-free plating product number: US2026AL
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
Normal
Lead Free Plating
US2026A-S08-R
US2026AL-S08-R
US2026A-S08-T
US2026AL-S08-T
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Copyright © 2007 Unisonic Technologies Co., Ltd
Package
Packing
SOP-8
SOP-8
Tape Reel
Tube
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US2026A
„
„
CMOS IC
PIN CONFIGURATIONS
EN1
1
FLAG1
2
FLAG2
3
EN2
4
UTC
US2026A
8
OUT1
7
IN
6
GND
5
OUT2
PIN DESCRIPTION
PIN NO
1
PIN NAME
EN1
2
FLAG1
3
FLAG2
4
5
6
7
8
EN2
OUT2
GND
IN
OUT1
DESCRIPTION
Switch1 Enable input: Logic-compatible enables inputs
Fault Detection Flag 1 (OUTPUT): Active-low. N-ch open-drain. Indicates
over-current, thermal shutdown, or UVLO conditions
Fault Detection Flag 2 (OUTPUT): Active-low. N-ch open-drain. Indicates
over-current, thermal shutdown, or UVLO conditions
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
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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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CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
-0.3 ~ +6
V
Output Voltage
VOUT
-0.3 ~ +6
V
Voltage at All Other Pins
VOTHER
-0.3 ~ +6
V
Total Power Dissipation
PD
300
mW
Junction Temperature
TJ
+150
℃
Operating Temperature
TOPR
-40 ~ +85
℃
Storage Temperature
TSTG
-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
Supply Voltage Range
Operating Temperature
„
SYMBOL
VIN
TOPR
RATINGS
+2.7 ~ +5.5
0 ~ +70
UNIT
V
℃
ELECTRICAL CHARACTERISTICS (TJ = 25°C, VIN = 5.0V, VEN = 0V, unless otherwise specified.)
PARAMETER
DC CHARACTERISTIC
EN Input Logic
SYMBOL
High
Low
Under-Voltage Lockout Threshold
OUT Pins Continuous Output
Current
Over-Current Threshold
OUT Pins Output Leakage Current
EN Leakage Current
OFF
Supply Current
ON
Error FLAG Leakage Current
VIH
VIL
VUVLO
IOUT
THDOC
ILEAK
IEN
IO(OFF)
IO(ON)
IFH
On Resistance
RON
FLAG Output Voltage
RFO
Over-Temperature Shutdown
Threshold
THDOT
TEST CONDITIONS
MIN
TYP
(Note 1)
(Note 1)
VIN=increasing
Hysteresis voltage
2.4
1.7
1.6
2.3
100
Each Output
0.5
VEN = VIN
VEN = 0V or VEN = VIN
Switch-Off
Switch-On
VFLAG = 5V
VIN = 5V, IOUT = 500mA, each switch
VIN = 2.7V, IOUT = 500mA, each switch
IFO = 10 mA, VIN = 5.0V
IFO = 10 mA, VIN = 3.3V
IFO = 10 mA, VIN = 2.7V
TJ Increasing, with no shorted output
TJ Increasing, with shorted output (s)
TJ Decreasing (Note 2)
AC CHARACTERISTIC
Over Current Flag Delay
tOC
RL = 0
OUT Rise Time
tR
RL = 10Ω
OUT Fall Time
tF
RL = 10Ω
Turn on Delay, EN to OUT
tON
RL = 10Ω
Turn off Delay, EN to OUT
tOFF
RL = 10Ω
Note: 1. OFF is EN ≥ 2.4V and ON is EN ≤ 0.8V.
2. Thermal Shutdown will protect the device from permanent damage.
UNISONIC TECHNOLOGIES CO., LTD
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MAX UNIT
0.8
2.7
V
V
V
mV
A
1.5
0.01
-0.5
1
0.01
105
135
10
11
12
155
145
135
1
160
5
240
5
2.2
10
0.5
5
110
1
145
180
20
30
40
A
µA
µA
µA
µA
µA
mΩ
Ω
°C
ms
µs
µs
µs
µs
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US2026A
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CMOS IC
TEST CIRCUIT
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US2026A
CMOS IC
TIMING DIAGRAM
„
90%
VIN
VEN
tRISE
tOFF
tON
90%
VOUT
tFALL
90%
90%
10%
90%
10%
VOUT
VEN
VEN
Standby Status
Current Limit
VOUT
IOUT
Short Circuit
VFLAG
VOUT
Operating
temperature rising
Operating
temperature falling
TJ
VFLAG
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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
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CMOS IC
TYPICAL APPLICATION CIRCUIT
USB Port
US2026A
5V
1µF
IN
10kΩ
VBUS
OUT1
D+
150µF
10kΩ
DGND
USB Controller
Over-Current
ON/OFF
EN1
USB Port
FLAG2
Over-Current
D+ D-
DATA
FLAG1
ON/OFF
EN2
GND
OUT2
VBUS
D+
150µF
D-
DATA
GND
DATA
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US2026A
CMOS IC
FLAG On-Resistance (Ω)
Output On-Resistance (mΩ)
TYPICAL CHARACTERISTICS (TJ = 25℃, VIN = 5.0V, unless otherwise specified)
„
2.1
Over-Current Limit vs. Input Voltage
1.9
1.8
EN Threshold Voltage (V)
Over-Current Limit (A)
1.8
1.5
1.2
0.9
0.6
0.3
0
2.5
EN Threshold Voltage vs. Input Voltage
1.7
VIH
1.6
VIL
1.5
1.4
1.3
3.0
3.5
4.0 4.5
5.0
Input Voltage (V)
5.5
6.0
UNISONIC TECHNOLOGIES CO., LTD
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1.2
2.5
3.0
3.5
4.0 4.5
5.0
Input Voltage (V)
5.5
6.0
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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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