Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US201/A/B/C
CMOS IC
HIGH-SIDE POWER SWITCHES
WITH FLAG

DESCRIPTION
The UTC US201/A/B/C series are 80mΩ high-side power
switches. There’s internal single low voltage N-Channel MOSFET
which makes it an ideal for all USB applications. This MOSFET
should be driven by a charge pump circuitry inside. Its switch on
resistance is as low as 80mΩ which we know specially meets the
drop voltage for USB applications.
The flag pin can output an open-drain fault flag to next controller.
There’re lots internal special ways for protecting the chip’s
operation.
When in hot-plug events, there’s large current which can create
the upstream voltage droop to match the USB’s voltage droop
requirements and soft-start for isolating the power source.
As soon as the die temperature is higher than 130℃, the internal
shutdown circuit will work.
Only when there’s a normal input voltage in the VIN pin, the
UVLO (under-voltage lockout, 1.3V/2.5V typ.) can make sure the
chip is till in the off state.
Because of the requirement of USB power the fault current
should be ensured less than 0.6A/1.1A (UTC US201/A, single port)
and 1.3A /1.5A (UTC US201B/C, dual ports).

FEATURES
* 80mΩ(Typ) N-Channel MOSFET
* Supply Current:
– Switch On : 25μA(Typ)
– Switch Off : 1μA (Typ)
* Load Current 500mA for US201 and 1.0A for US201A/B/C
* Input Voltage from 2V ~ 5.5V
* In Off-State: Output Voltage can be Higher than Input

ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
US201XXL-AF5-R
US201XXG-AF5-R
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Copyright © 2013 Unisonic Technologies Co., Ltd
Package
Packing
SOT-25
Tape Reel
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US201/A/B/C

CMOS IC
MARKING
4
5
Current Code:
1: 0.6A, A: 1.1A,
B: 1.3A, C: 1.5A

US
1
2
3
G: Halogen Free
L : Lead Free
Logic Level Enable Pin
PIN CONFIGURATION
VIN
4
VOUT
5
1
CTL

3
FLG
PIN DESCRIPTION
PIN NO
1
2
3
4
5

2
GND
PIN NAME
CTL
GND
FLG
VIN
VOUT
DESCRIPTION
Enable Input pin, H: High active, L: Low active
Ground
Open-drain fault flag output
Power input voltage
Output voltage
BLOCK DIAGRAM
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US201/A/B/C

CMOS IC
ABSOLUTE MAXIMUM RATING(TA=25°С, unless otherwise specified)
PARAMETER
SYMBOL
Supply Voltage
RATINGS
6.5
+2 ~ +5.5 (Note 2)
-0.3~ +6.5
0 ~ +5.5 (Note 2)
UNIT
V
V
V
V
6.5
V
150
℃
-20 ~ +100 (Note 2)
℃
-65 ~ +150
℃
VCC
Input/Output Pins
VCTL
VCTL
V FLG
V FLG
Junction Temperature
TJ
Storage Temperature
TSTG
Notes:1. 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.
2. The device is not guaranteed to function when it’s beyond its operating conditions.

THERMAL DATA
SYMBOL
RATINGS
UNIT
Junction to Ambient
PARAMETER
θJA
260
℃/W
Junction to Case
θJC
81
℃/W

ELECTRICAL CHARACTERISTICS
PARAMETER
ENABLE INPUT
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
CTL Input Current
UNDER VOLTAGE LOCK
II(CTL)
VIN=2V~5.5V, Switch OFF
VIN=2V~5.5V, Switch ON
VCTL=0V~5.5V
Under-Voltage Lockout
VUVLO
VIN increasing
∆VUVLO
VIN decreasing
2.1
2.5
0.1
ISW(ON)
ISW(OFF)
IO(LEAK)
Switch on, VOUT=OPEN
Switch off, VOUT=OPEN
VCTL=0V, RLOAD=0Ω
25
0.1
0.5
45
1
10
µA
µA
µA
0.8
1.5
1.7
2.0
0.8
1.0
1.0
1.3
1.1
1.9
2.1
2.4
A
A
A
A
A
A
A
A
80
80
400
110
110
mΩ
mΩ
µs
0.01
20
1
400
µA
Ω
10
15
ms
CTL Threshold
Low
High
Under-Voltage Hysteresis
SUPPLY CURRENT
Supply Current
Output Leakage Current
CURRENT LIMIT
VIL
VIH
Current Limit
ILIMIT
Short Circuit Fold-Back Current
ISC(FB)
0.8
V
V
µA
2.9
V
2.0
0.01
US201/ US201A
US201B/ US201C
US201
US201A
US201B
US201C
US201
VOUT=0V, measured prior to US201A
thermal shutdown
US201B
US201C
1.0
0.6
1.1
1.3
1.5
V
POWER SWITCH
Switch ON Resistance
RDS(ON)
Output Turn-ON Rise Time
OVER CURRENT FLAG
FLAG OFF Current
FLAG Output Resistance
tON(RISE)
FLAG Delay Time
I FLG(OFF)
RFLG
tD
IOUT= 500mA
IOUT=1.0A
10% ~ 90% of VOUT rising
US201
US201A/B/C
V FLG =5V
ISINK=1mA
From fault condition to FLG assertion
2
THERMAL SHUTDOWN
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US201/A/B/C
CMOS IC
Thermal Shutdown Protection
TSD
130
℃
Thermal Shutdown Hysteresis
∆TSD
20
℃
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US201/A/B/C

CMOS IC
TEST CIRCUIT
RFG
VIN
VIN
FLG
VFLG
S1
UTC
US201/A/B/C
CI
Chip
Enable
CTL
VOUT
GND
A
IOUT
VOUT
CO
RL
IL
Fig.1 Turn-On & Off Response, Flag Response
ISupply
A
VIN
VIN
CIN
FLG
UTC
US201/A/B/C
Chip
Enable
VOUT
EN
VFLG
ILEAK AGE
A
RL
GND
Fig.2 Supply Current
VRDS(ON)
V
IOUT
VOUT
VIN
VIN
CIN
Chip
Enable
UTC
US201/A/B/C
COUT
FLG
EN
GND
Fig.3 On-Resistance
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US201/A/B/C

CMOS IC
TEST CIRCUIT
RFG
VIN
VIN
FLG
VFLG
UTC
US201/A/B/C
CI
CTL
VCTL
GND
VOUT
VOUT
CO
RL
IL
Fig.4 UVLO at Rising & Falling
S2
RFG
VIN
VIN
CI
FLG
VFLG
UTC
US201/A/B/C
CTL
GND
VOUT
VOUT
CO
IOUT
A
S3
RL
IL
Fig.5 Current Limit vs. Input Voltage, Inrush Current Response,
Current Limit Transient Response
Note:
Above test circuits reflected the graphs shown on “Typical Operating Characteristics” are as follows:
Fig.1 Turn-On Rising & Falling Time vs. Temperature, Turn-On & Off Response, Flag Response.
Fig.2 Supply Current vs. Input Voltage & Temperature, Switch Off Supply Current vs. Temperature, Turn-Off
Leakage Current vs. Temperature.
Fig.3 On-Resistance vs. Input Voltage & Temperature.
Fig.4 EN Threshold Voltage vs. Input Voltage & Temperature, Flag Delay Time vs. Input Voltage &
Temperature, UVLO Threshold vs. Temperature, UVLO at Rising & Falling.
Fig.5 Current Limit vs. Input Voltage/Temperature, Short Circuit Current Response, Short Circuit Current vs.
Temperature, Inrush Current Response, Soft-start Response, Ramped Load Response, Current Limit
Transient Response, Thermal Shutdown Response.
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
CMOS IC
TYPICAL APPLICATION CIRCUIT
Pull-Up Resistor (10K ~ 100K)
RFG
Supply Voltage 5V
10K
VIN
FLG
USB
Controller
Over Current
0.1µF
UTC
US201/A/B/C
1µF
Chip Enable
Flag Transient Filtering
CTL
VBUS
D+
DGND
VOUT
GND
10µF
150µF
Ferrite Beades
Data
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.
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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