Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US222
Preliminary
LINEAR INTEGRATED CIRCUIT
0.5A TO 2.0A HIGH-SIDE
POWER DISTRIBUTION
SWITCHES

DESCRIPTION
The UTC US222 are low voltage cost-effective high-side
power switches with flag function. These devices are particularly
suitable for self-powered and bus-powered USB applications. The
build-in N-MOSFET’s RDS(ON) which meets the requirements of
USB voltage drop is as low as 85 mΩ.
The UTC US222 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.

FEATURES
* Low MOSFET On Resistance: 85mΩ
* Compliant to USB Specifications
* Available 4 Versions of Continuous Load: 0.5A/1.0A/1.5A/2.0A
* Logic Level Enable Pin: Available with Active-high or Active-low
Version
* Low Supply Current: 68µA (Typ.)
* Low Shutdown Current: 1.0µA (Max)
* Soft Start-up

* Under-voltage Lockout
* Over-current Protection
* Over Temperature Protection
* Load Short Protection with Fold-back
* Deglitched FLAG Output with Open Drain
* No Reverse Current When Power Off
* With Output Shutdown Pull-low Resistor
ORDERING INFORMATION
Ordering Number
US222XXG-AF5-R
Package
SOT-25
Packing
Tape Reel
US222XXG-AF5-R
(1)Packing Type
(1) R: Tape Reel
(2)Package Type
(2) AF5: SOT-25
(3)Green Package
(3) G: Halogen Free and Lead Free
(4)Current Limit
(4) AL/AH: 2.0A, BL/BH: 1.5A, CL/CH: 1.0A, DL/DH: 0.5A
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US222
Preliminary

MARKING

PIN CONFIGURATION
VIN
EN
4
5
2
1
VOUT
3
GND FLAG
PIN DESCRIPTION

PIN NO.
1
2
PIN NAME
VOUT
GND
3
FLAG
4
5
EN
VIN

LINEAR INTEGRATED CIRCUIT
DESCRIPTION
Switch output voltage
Ground
Fault flag pin, output with open drain, need a pull-up resistor in application, active low to
indicate OCP or OTP
Chip enable control input, active low or high
Supply input pin
BLOCK DIAGRAM
VIN
Current
Limiting
UVLO
EN
Gate
Control
Bias
Oscillator
Thermal
Protection
Charge
Pump
Output
Voltage
Detection
Delay
VOUT
FLAG
GND
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US222

Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Power Supply Voltage
VIN
6.0
V
Operating Junction Temperature Range
TJ
150
°C
Storage Temperature Range
TSTG
-65~+150
°C
Lead Temperature (Soldering, 10sec)
TLEAD
260
°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.

RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
Operating Ambient Temperature Range

MIN
TYP
-40
MAX
5.5
85
UNIT
V
°C
THERMAL DATA
PARAMETER
Junction to Ambient

SYMBOL
VIN
TA
SYMBOL
θJA
RATINGS
300
UNIT
℃/W
ELECTRICAL CHARACTERISTICS
(VIN=5.0V, CIN=2.2µF, COUT=1.0µF, Typical TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Supply Voltage
VIN
Switch On Resistance
RDS(ON)
VIN=5.0V, IOUT=0.5A
Supply Current
ISUPPLY
VIN=5.0V, No Load
US222AL/AH (2.0A), VOUT=4.0V
US222BL/BH (1.5A), VOUT=4.0V
Current Limit
ILIMIT
US222CL/CH (1.0A), VOUT=4.0V
US222DL/DH (0.5A) , VOUT=4.0V
Fold-back Short Current
ISHORT
US222A/B/C/D, VOUT=0V
Shutdown Supply Current
ISHUTDOWN Chip Disable, Shutdown Mode
Enable High Input Threshold
VENH
Enable Low Input Threshold
VENL
Enable Pin Input Current
IEN
Force 0V to 5.0V at EN Pin
Under Voltage Lockout
VUVLO
VIN Increasing from 0V
Threshold Voltage
Under Voltage Hysteresis
VUVLOHY
Output Pull Low Resistance
RDISCHARGE
after Shutdown
From Enable Active to 90% of
Output Turn-on Time
tON
Output
From Over Current Fault
FLAG Pin Delay Time
tDFLG
Condition to Flag Active
FLAG Pin Low Voltage
VFLG
ISINK=1.0mA
FLAG Pin Leakage Current
ILEAKAGE FLAG Disable, Force 5.0V
Thermal Shutdown Temperature
TOTSD
Thermal Shutdown Hysteresis
THYOTSD
UNISONIC TECHNOLOGIES CO., LTD
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MIN
TYP
2.1
1.6
1.1
0.6
85
68
2.7
2.0
1.5
1.0
1.0
0.1
MAX
5.5
110
95
3.6
2.8
2.1
1.4
5.0
2.0
0.8
1.0
-1.0
UNIT
V
mΩ
µA
A
A
A
A
A
µA
V
V
µA
2.5
V
0.2
V
100
Ω
400
µs
12
ms
35
1.0
150
30
mV
µA
°C
°C
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US222

Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
R
10kΩ
VIN=5V
5
CIN
(Note 1)
2.2µF
3
USB Controller
UTC
US222
4
Enable
FLAG
VIN
EN
GND
2
VOUT
1
COUT
1µF
VBUS
D+
DGND
Note: 2.2µF input capacitor is enough in most application cases.
If the VOUT is short to ground frequently during usage, large size input capacitor is necessary, recommend
22µF.
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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