UNISONIC TECHNOLOGIES CO., LTD
US3026A
DUAL-CHANNEL USB POWER
SWITCH AND OVER-CURRENT
PROTECTION
DESCRIPTION
The UTC
US3026A
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
US3026A
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
US3026A
employs soft-start circuitry that
minimizes in-rush current in applications where highly capacitive
loads are employed.
CMOS IC
SOP-8
*Pb-free plating product number: US3026AL
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
Order Number
Normal
Lead Free Plating
US3026A-S08-R
US3026AL-S08-R
US3026A-S08-T
US3026AL-S08-T
Package
SOP-8
SOP-8
Packing
Tape Reel
Tube
US3026AL-S08-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
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QW-R502-086,A
US3026A
PIN CONFIGURATIONS
EN1
FLAG1
FLAG 2
EN2
CMOS IC
1
2
3
4
UTC
US3026A
8
7
6
5
OUT1
IN
GND
OUT2
PIN DESCRIPTION
PIN NO
1
2
3
4
5
6
7
8
PIN NAME
EN1
FLAG1
FLAG2
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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-086,A
US3026A
BLOCK DIAGRAM
CMOS IC
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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-086,A
US3026A
ABSOLUTE MAXIMUM RATINGS
PARAMETER
CMOS IC
SYMBOL
RATINGS
UNIT
Supply Voltage
V
IN
-0.3 ~ +6
V
Output Voltage
V
OUT
-0.3 ~ +6
V
Voltage at All Other Pins
V
OTHER
-0.3 ~ +6
V
Total Power Dissipation
P
D
300
mW
T
JMAX
T
JMAX
160
℃
Junction Temperature
T
J
+155
℃
Operating Temperature
T
OPR
-40 ~ +85
℃
Storage Temperature
T
STG
-55 ~ +155
℃
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
SYMBOL
RATINGS
Supply Voltage Range
V
IN
+2.7 ~ +5.5
Operating Temperature
T
OPR
0 ~ +70
Note: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
PARAMETER
UNIT
V
℃
ELECTRICAL CHARACTERISTICS
(T
J
= 25°C, V
IN
= 5.0V, V
EN
= 0V, unless otherwise specified.)
PARAMETER
DC CHARACTERISTIC
EN Input Logic
High
Low
SYMBOL
V
IH
V
IL
V
UVLO
I
OUT
THD
OC
I
LEAK
I
EN
I
O(OFF)
I
O(ON)
I
FH
R
ON
R
FO
TEST CONDITIONS
(Note 1)
(Note 1)
V
IN
=increasing
Hysteresis voltage
Each Output
V
EN
= V
IN
V
EN
= 0V or V
EN
= V
IN
Switch-Off
Switch-On
V
FLAG
= 5V
V
IN
= 5V, I
OUT
= 500mA, each switch
V
IN
= 2.7V, I
OUT
= 500mA, each switch
I
FO
= 10 mA, V
IN
= 5.0V
I
FO
= 10 mA, V
IN
= 3.3V
I
FO
= 10 mA, V
IN
= 2.7V
T
J
Increasing, with no shorted output
T
J
Increasing, with shorted output (s)
T
J
Decreasing (Note 2)
MIN
2.4
TYP
1.7
1.6
2.3
100
MAX UNIT
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
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
On Resistance
FLAG Output Voltage
Over-Temperature Shutdown
Threshold
0.8
2.7
0.5
THD
OT
°C
AC CHARACTERISTIC
Over Current Flag Delay
t
OC
R
L
= 0
OUT Rise Time
t
R
R
L
= 10Ω
OUT Fall Time
t
F
R
L
= 10Ω
Turn on Delay, EN to OUT
t
ON
R
L
= 10Ω
Turn off Delay, EN to OUT
t
OFF
R
L
= 10Ω
Note: 1. OFF is EN
≥
2.4V and ON is EN
≤
0.8V.
2. Thermal Shutdown will protect the device from permanent damage.
ms
µs
µs
µs
µs
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-086,A
US3026A
TEST CIRCUIT
CMOS IC
V
IN
1M
1M
10K
10K
US3026A
FLAG1
IN
C
IN
FLAG2
OUT1
EN1
C
L1
V
OUT2
EN2
K1
K2
C
L2
R
L2
GND
OUT2
R
L1
V
OUT1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-086,A
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