Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US107
Preliminary
LINEAR INTEGRATED CIRCUIT
POWER DISTRIBUTION
SWITCH

DESCRIPTION
The UTC US107 is a power distribution switch. It is intended for
applications such as USB where heavy capacitive loads and
short-circuits are likely to be encountered. This family offers multiple
devices with fixed current-limit thresholds for applications between
1.2 A, 1.7A and 2.5 A.
The RDS(ON) of the MOSFET switch is as low as 70mΩ. OC is
open-drain output report over-current or over-temperature event
which has typical 9ms deglitch timeout period, also reports output
reverse-voltage condition with typical 5ms deglitch timeout period.
The UTC US107 incorporates protection circuits including current
limiting circuit with foldback function, thermal shutdown circuit
designed to prevent catastrophic switch failure due to increasing
power dissipation when continuous heavy loads or short circuit
occurs. Besides, a built-in charge pump is used to drive the
N-channel MOSFET that is free of parasitic body diode to eliminate
any reversed current flow across the switch when it is powered off.
The UTC US107 is applied in high-side power protection switch,
USB power management, USB host and self-powered bubs, USB
bus-powered hubs, hot plug-in power supplies, battery-charger
circuits.

FEATURES
* Single power switch family
* Operating range: 3.0V~5.5V
* 130µA quiescent supply current
* 1µA maximum shutdown supply current
* 70mΩ high-side MOSFET
* 1mS typical rise time
* Under voltage lockout

* Logic level enable pin, available with Active-high or
active-low version
* No reverse current when power off
* Available with or without output shutdown pull-low
resister
* Deglitched open-drain over-current flag output ( OC )
* Output reverse-voltage protection
ORDERING INFORMATION
Ordering Number
US107xxG-AF5-R
Note:
Pin Assignment: O: OUT
G: GND OC: OC
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOT-25
C: CE/ CE
Pin Assignment
1
2
3
4
O
G OC C
5
I
Packing
Tape Reel
I: IN
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US107
Preliminary
MARKING

US107A
U17Ax
US107B
U17Bx
L: Low, H: High
US107C
U17Cx
L: Low, H: High
L: Low, H: High
PIN CONFIGURATION

IN
5
1
2
OUT GND
EN (EN)
4
3
OC
PIN DESCRIPTION

PIN NO.
PIN NAME
1
OUT
2
GND
3
OC
4
EN( EN )
5
IN

LINEAR INTEGRATED CIRCUIT
DESCRIPTION
Switch Output: Output MOSFET Source of switch. Typically connect to switched side of
load.
Ground
Over-Current: Open-Drain OC output.
Enable: Logic level enable input.
Make sure EN pin never floating.
Input Supply: Output MOSFET Drain, which also supplies IC's internal circuitry. Connect
to positive supply.
BLOCK DIAGRAM
IN
EN
(EN)
Output
Reverse-Voltage
Protection
Clock
Gate Control
UVLO
Overcurrent
Limiting
BandGap
Reference
CMP
Current
Sense
OUT
Shutdown
Signal
OC
Thermal Sense
OC Deglitch logic
GND
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US107

Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
6
V
Output Voltage
VOUT
6
V
Output Current
IOUT
Internally Limited
Enable Input
VEN
-0.3 ~ 6
V
Continuous Power Dissipation (Note 2)
PD
0.5
W
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-65 ~ +150
°C
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. Please refer to Minimum Footprint PCB Layout Section.

OPERATING RATINGS
PARAMETER
Supply Voltage
Operating Temperature

SYMBOL
VIN
TA
RATINGS
3.0 ~ 5.5
-40 ~ +85
UNIT
V
°C
THERMAL DATA
PARAMETER
Junction to Ambient (Note 2)
Junction to Case
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SYMBOL
θJA
θJC
RATINGS
260
85
UNIT
°C/W
°C/W
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US107

Preliminary
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (VIN=5V, CIN=1µF, COUT=1µF, RL=10Ω, TA=25°C)
The device is not guaranteed to function outside its operating conditions. Parameters with MIN and/or MAX limits are
100% tested at +25°C, unless otherwise specified.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Voltage Rage
VIN
3.0
5.5
V
Output MOS RDS(ON)
RDS(ON)
70
85
mΩ
Supply Current
ION
130
190
µA
Shutdown Supply Current
IOFF
0.1
1
µA
VIN=5V
1.4
1.8
ms
Output Turn-on Rising Time
TON
RL=10Ω, 90% Settling
2
2.4
ms
VIN=3.3V
US107A
2.2
2.5
2.8
A
Over Current Trigger Point
ILIMIT US107B
1.7
2.0
2.3
A
US107C
1.2
1.5
1.8
A
US107A, VIN>3.5V and VOUT<1V
1.6
A
Fold-Back Current
ISC(FB) US107B, VIN>3.5V and VOUT<1V
1.3
A
US107C, VIN>3.5V and VOUT<1V
1.0
A
EN Input Threshold-High VIH
VIH
1.2
V
EN Input Threshold-Low VIL
VIL
0.6
V
Shutdown Pull Low Resistance
RPD
300
Ω
Output Leakage Current
IO(LEAK) EN=”0”, VOUT=0V
0.5
1
µA
VIN Under Voltage Lockout
VUVLO VIN Increasing
2.2
2.4
2.9
V
VIN Under Voltage Hysteresis
∆VUVLO VIN Decreasing
200
mV
Thermal Limit
TSD
140
°C
Thermal Limit Hysteresis
∆TSD
20
°C
TD
OC Deglitch
OC Output Low Voltage
OC Off-State Current
Output Reverse-Voltage Trigger
Point (VOUT-VIN)
Output Reverse-Current Trigger
Point
Output Reverse-Voltage Deglitch
Time
tIOS Response Time to Short Circuit
15
ms
V OC _OFF
I OC =2mA
0.4
V
I OC_OFF
V OC =5V
1
µA
VREV
OC Assertion or Deassertion
VIN=5V
IREV
TDREV
tIOS
VIN=5V
VIN=5V, See Figure 1,2
UNISONIC TECHNOLOGIES CO., LTD
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4
9
250
350
450
mV
200
400
800
mA
3
5
7
ms
1.5
µs
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US107

Preliminary
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
Note:
To exactly identify the short circuit characteristic of IC, avoid the test result interfered by parasitic inductor, output
capacitor, and contact resistor. It is necessary to follow the recommendation as follows.
Please,
1. Add 1000µF of capacitor between VIN and GND, and close to IC.
2. Remove output capacitor.
3. Shorter the short circuit device wire.
4. Measure output current (IOUT).
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US107

Preliminary
LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION
Input and Output
IN (input) is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUT (output)
is the source of the output MOSFET. In a typical application, current flows through the switch from IN to OUT toward
the load. Both OUT pins must be connected together to the load.
Thermal Shutdown
The thermal shutdown circuit is used to prevent damage occurs when the die temperature becomes higher than
approximately 140°C. After 20°C of hysteresis, the switch will automatically restart if it enabled. When these devices
are disabled or the fault is removed, the output and OC signal will continue to cycle on and off.
Undervoltage Lockout
UVLO (Under-voltage Lockout) turns off the MOSFET switch once the input voltage falls below 2.2V, and the
OC is in active. If the input voltage exceeds approximately 2.4V, the switch will be turned on. Under-voltage
detection functions only when the switch is enabled.
Over Current Trigger Point
The typical over current trigger point of UTC US107 is 2.5A, 2A, 1.5A. There is foldback of current limit when
VIN>3.5V and VOUT<1V.
Output Reverse-Voltage Protection
The output reverse-voltage protection turns off the MOSFET switch whenever the output voltage is higher than
the input voltage by 20mV (typ) for 5ms (typ) and the MOSFET switch will turn on when output reverse-voltage
condition is removed for 5ms (typ).
OC Function
The OC open-drain output is asserted (active low) when an over current condition is encountered after a 9ms
deglitch timeout. The output remains asserted until the overcurrent condition is removed. Over temperature condition
is also reported immediately by OC open-drain output. In addition, OC is also asserted (active low) in output
reverse-voltage condition with typical 5ms deglitch timeout period until the output reverse-voltage condition is
removed.
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US107

Preliminary
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
VOUT
IOUT
Device
Under
Test
OUT
COUT RL
CL
IL
Current Probe

TIMING DIAGRAMS
tR
tF
90%
VOUT
90%
10%
10%
Output Rise and Fall Times
VEN
50%
tOFF
tON
90%
VOUT
10%
Switch Delay Times
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US107

Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
UTC US107
Power Supply
2.7V to 5.5V
IN
(Note)
OUT
Load
0.1µF
1µF
22µF
OC
ON
EN(EN)
OFF
Note : 1µF of input capacitor is enough in most application cases.
If the PCB trace of power rail to IN is long, larger input capacitor is necessary.
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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