Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US2005
Preliminary
CMOS IC
FIXED CURRENT LIMIT POWER
DISTRIBUTION SWITCH

DESCRIPTION
UTC US2005 is a low voltage cost-effective high-side power switch
with current limiting function. It is particularly suitable for general
purpose power distribution and control in digital televisions (DTV),
printers, set top boxes (STB), PCs, PDAs, and other peripheral devices.
UTC US2005 contains a charge pump circuitry to drive the internal
MOSFET switch and also incorporate such protection circuits: soft-start
circuit protect these devices from being damaged by limiting inrush
current during plug-in; thermal shutdown circuit is used to prevent
catastrophic switch failure from high-current loads. UVLO is used to
ensure that the device remains off unless there is a valid input voltage
present. A flag output is designed to indicate fault conditions to the local
USB controller. Lower quiescent current as 80μA making this device
ideal for portable battery-operated equipment.
UTC US2005 allows momentary high current surges to pass
unrestricted without sacrificing overall system safety. It also allows
output slew rate limiting by an external capacitor.

FEATURES
* Built-in 80mΩ N-MOSFET
* Open-drain fault flag output to Indicate fault conditions
* Input voltage varies from 2.5V to 5.5V
* 80μA low quiescent current
* Current limit values of 0.5A, 0.8A, and 1.2A
* Automatic-on output after fault
* Thermal protection
* Under voltage lock-out (UVLO)
ORDERING INFORMATION

Note:

Ordering Number
Lead Free
Halogen Free
US2005L-AG6-R
US2005G-AG6-R
xx: Output Voltage, refer to Marking Information.
Package
Packing
SOT-26
Tape Reel
MARKING INFORMATION
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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US2005
Preliminary

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
PIN NAME
1
IN
2
3
GND
EN
4
FLG
5
CSLEW
6
OUT

CMOS IC
DESCRIPTION
Supply input. This pin provides power to both the output switch and the UTC US2005’s
internal control circuitry.
Ground.
Switch Enable (Input): Active-high (-1) or active-low (-2)
Fault status. A logic LOW on this pin indicates the UTC US2005 is in current limiting, or
has been shut down by the thermal protection circuit. This is an ‘Open Drain’ output
allowing logical OR’ ing of multiple UTC US2005s.
Slew rate control. Adding a small value capacitor between this pin and VIN slows
turn-ON of the power FET.
Switch output. The load being driven by UTC US2005 is connected to this pin.
BLOCK DIAGRAM
IN
Slew Rate
Control
CSLEW
EN
UVLO
Current
Limiting
Gate
Control
Bias
Oscillator
Thermal
Protection
Charge
Pump
Output
Voltage
Detection
Delay
OUT
FLG
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified) (Note 1)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
6
V
Enable Input Voltage
VEN
5.5
V
Flag Voltage
VFLG
5.5
V
Power Dissipation (TA=25°C)
PD
0.4
W
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-65~150
°C
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
Package Thermal Resistance

SYMBOL
θJA
UNIT
°C/W
RATINGS
2.5~5.5
0~5.5
0~2.1
-40~+85
UNIT
V
V
A
°C
RECOMMENDED OPERATING CONDITIONS (Note 2)
PARAMETER
Supply Input Voltage
Enable Input Voltage
Continuous Output Current Range
Ambient Operating Temperature

RATINGS
230
SYMBOL
VIN
VI(EN)
TA
ELECTRICAL CHARACTERISTICS
(VIN=5V, TAMBIENT=25°C unless specified otherwise. Bold indicates -40°C~+85°C limits.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
Switch Input Voltage
VIN
2.5
Internal Supply Current
IIN
Switch=OFF, ENABLE=0V
Internal Supply Current
IIN
Switch=ON, IOUT=0, ENABLE=1.5V
Output Leakage Current
ILEAK
VIN=5V, VOUT=0V, ENABLE=0
Power Switch Resistance
RDS(ON)
Current Limit: –0.5
Current Limit: –0.8
Current Limit: –1.2
Secondary Current Limit
(Kickstart)
Under Voltage Lock Out
Threshold
ILIMIT
ILIMIT
ILIMIT
ILIMIT_2nd
UVLOTHRESHOLD
ENABLE Input Voltage
VEN
ENABLE Input Current
Fault Status Output Voltage
IEN
Over-Temperature Threshold
VFAULT
OTTHRESHOLD
VOUT=0.8VIN to VOUT=1V
VOUT=0.8VIN to VOUT=1V
VOUT=0.8VIN to VOUT=1V
0.5
0.8
1.2
0.7
1.1
1.6
MAX
5.5
5
300
100
100
125
0.9
1.5
2.1
VIN=2.7V
2.2
4
6
A
VIN Rising
VIN Falling
VIL(max.)
VIH(min)
VEN=0V~5.0V
IOL=10mA
TJ Increasing
TJ Decreasing
2.0
1.9
2.25
2.15
25
2.4
0.5
1
0.25
145
135
5
0.4
V
V
V
V
μA
V
VIN=5V, IOUT=100mA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TYP
1
80
12
70
1.5
UNIT
V
μA
μA
μA
mΩ
mΩ
A
A
A
°C
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
Preliminary
CMOS IC
AC CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITIONS
Output Turn-ON Rise Time
tRISE
RL=10Ω, CLOAD=1µF, VOUT=10%~90%
Time from Current Limiting to FLG State
Delay Before Asserting Or
tD_FAULT
Change. UTC US2005
Releasing FLG
Output Turn-ON Delay
tON_DLY RL=43Ω, CL=120µF, VEN=50%~VOUT=90%
Output Turn-OFF Delay
tOFF_DLY RL=43Ω, CL=120µF, VEN=50%~VOUT=90%
Notes: 1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
500
TYP
1000
MAX
1500
UNIT
μs
20
32
49
ms
1000
1500
700
μs
μs
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
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
UTC US2005
5V Supply
+
IN
OUT
CSLEW
GND
EN
VBUS
+
D+/D-
USB
Port
FLG
USB
Controller
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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