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US223 の電気的特性と機能

US223のメーカーはUnisonic Technologiesです、この部品の機能は「HIGH-SIDE POWER SWITCHES」です。


製品の詳細 ( Datasheet PDF )

部品番号 US223
部品説明 HIGH-SIDE POWER SWITCHES
メーカ Unisonic Technologies
ロゴ Unisonic Technologies ロゴ 




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US223 Datasheet, US223 PDF,ピン配置, 機能
UNISONIC TECHNOLOGIES CO., LTD
US223
Preliminary
HIGH-SIDE POWER SWITCHES
WITH FLAG
CMOS IC
DESCRIPTION
The UTC US223 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 80m.
The UTC US223 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 25μA making this device ideal for
portable battery-operated equipment.
The UTC US223 are applied in USB Bus/Self powered hubs, USB
peripherals, NB, PCs, PC card hot swap, battery-powered equipment,
hot-plug power supplies, battery-charger circuits, ACPI power
distribution.
4
5
3
12
SOT-25
FEATURES
* Input Voltage Varies From 3.5V to 5.5V
* Built-in N-MOSFET
* Output Can Be Forced Higher Than Input (Off-State)
* Typical Low Supply Current:
- Switch On: 25μA (TYP)
- Switch Off: 0.1μA (TYP)
* Open-Drain Fault Flag Output To Indicate Fault
Conditions
* Protection Circuits:
- Soft-start( Hot plug-in application)
- UVLO 1.7V (TYP.)
- Current Limiting Protection
- Thermal Shutdown Protection
* Reverse Current Flow Blocking (No Body Diode)
ORDERING INFORMATION
Ordering Number
US223XXG-AF5-R
Package
SOT-25
Packing
Tape Reel
US223XXG-AF5-R
(1)Packing Type
(2)Package Type
(3)Current Limit
(4)Green Package
(1) R: Tape Reel
(2) AF5: SOT-25
(3) AH/AL: 3.2A, BH/BL: 2.5A, CH/CL: 1.8A, DH/DL: 1.1A
(4) G: Halogen Free and Lead Free
www.unisonic.com.tw
Copyright © 2016 Unisonic Technologies Co., Ltd
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US223 pdf, ピン配列
US223
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA = 25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
Enable Input Voltage
VIN 6.5 V
VEN -0.3 ~ +6.5 V
Flag Voltage
Power Dissipation (TA = 25°C)
VFLG
PD
6.5 V
0.4 W
Junction Temperature
Storage Temperature
TJ
TSTG
150
-65~150
°C
°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
Junction to Ambient
SYMBOL
θJA
RECOMMENDED OPERATING CONDITIONS
RATINGS
250
UNIT
°C/W
PARAMETER
Supply Input Voltage
Enable Input Voltage
Junction Temperature
Ambient Operating Temperature
SYMBOL
VIN
VI(EN)
TJ
TOPR
RATINGS
3.5 ~ 5.5
0 ~ 5.5
-40 ~ +125
-40 ~ +85
UNIT
V
V
°C
°C
ELECTRICAL CHARACTERISTICS (VIN=5V, CIN=COUT=1μF, TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Switch On Resistance (US223A, US223B)
Switch On Resistance (US223C, US223D)
Supply Current
EN Threshold Voltage
EN Input Current
Output Leakage Current
Output Turn-On Rise Time
Logic-Low
Logic-High
US223Ax
RDS(ON)
ISW_ON
ISW_OFF
VIL
VIH
IEN
IO(LEAK)
TON(RISE)
IOUT= 1A, VIN= 5V
IOUT= 0.5A, VIN= 5V
switch on, RLOAD Open
switch off, RLOAD Open
VIN = 3.5V ~ 5.5V
VIN = 3.5V ~ 5.5V
VEN/EN = 0V ~ 5.5V
VEN=0V, RLOAD= 0
10% to 90% of VOUT rising
Current Limit
US223Bx
US223Cx
ILIMIT
Current Ramp (< 0.1A/ms) on
VOUT
US223Dx
US223Ax
Short Circuit Fold-Back
Current
US223Bx
US223Cx
ISC(FB)
VOUT = 0V, measured prior to
thermal shutdown
US223Dx
FLAG Output Resistance
FLAG Off Current
R FLG ISINK= 1mA
I FLG _OFF V FLG = 5V
FLAG Delay Time
tD
From fault condition to FLG
assertion
Shutdown Pull-Low Resistance
RDS VEN=0V, VEN
Under-Voltage Lockout
VUVLO VIN increasing
Under-Voltage Hysteresis
VUVLO VIN decreasing
Thermal Shutdown Protection
TSD
Thermal Shutdown Hysteresis
TSD
Note: The device is not guaranteed to function outside its operating conditions.
MIN TYP MAX UNIT
80 120 m
80 120 m
75
0.1
120
1
μA
0.8 V
2.0 V
0.01 μA
0.5 10 μA
400 μs
2.1 2.5 3.2 A
1.6 2.0 2.5 A
1.1 1.5 1.8 A
0.6 0.8 1.1 A
1A
1A
1A
1A
20 400
0.01 1 μA
5 12 20 ms
75 150
1.3 1.7
V
0.1 V
130 °C
20 °C
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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US223 電子部品, 半導体
US223
Preliminary
CMOS IC
APPLICATION INFORMATION(Cont.)
Output Filter Capacitor
To meet the requirement of the maximum droop (330mV) in the hub VBUS, a 150μF low-ESR electrolytic or
tantalum located from VOUT and GND is strongly desired. Standard bypass methods should be used to minimize
inductance and resistance between the bypass capacitor and the downstream connector to reduce EMI and
decouple voltage droop caused when downstream cables are hot-insertion transients. For EMI and ESD protection
consideration , ferrite beads in US223 with VBUS, the ground line and the 0.1μF bypass capacitors at the power
connector pins are needed. The bypass capacitor itself should have a low dissipation factor to allow decoupling at
higher frequencies.
Voltage Drop
A minimum port-output voltage in two locations on the bus is shown in the USB specification, in which, 4.75V out
of a self- powered hub port and 4.40V out of a bus-powered hub port. As with the self-powered hub, all resistive
voltage drops for the bus-powered hub must be accounted for to guarantee voltage regulation. VOUT (MIN) for multiple
ports (NPORTS) ganged together through one switch (if using one switch per port, NPORTS is equal to 1) can be
established by the following equation:
VOUT (MIN) = 4.75V [ II x ( 4 x RCONN + 2 x RCABLE ) ] (0.1A x NPORTS x RSWITCH ) VPCB
Where,
RCONN = Resistance of connector contacts (two contacts per connector)
RCABLE = Resistance of upstream cable wires (one 5V and one GND)
RSWITCH = Resistance of power switch (80mtypical for UTC US223)
VPCB = PCB voltage drop
The USB specification defines the maximum resistance per contact (RCONN) of the USB connector to be 30m
and the drop across the PCB and switch to be 100mV. This basically leaves two variables in the equation: the
resistance of the switch and the resistance of the cable. If the hub consumes the maximum current (II) of 500mA, the
maximum resistance of the cable is 90m. The following equation determines the resistance of the switch:
RSWITCH= { 4.75V 4.4V [ 0.5A x ( 4 x 30m+ 2 x 90m) ] VPCB } ÷ ( 0.1A x NPORTS )
= (200mV VPCB ) ÷ ( 0.1A x NPORTS )
If the voltage drop across the PCB is limited to 100mV, the maximum resistance for the switch is 250mfor four
ports ganged together. The UTC US223, with its maximum 100mon-resistance over temperature, easily meets this
requirement.
PCB Layout Guide
Careful PCB layout should be taken into consideration for meeting the requirements of the voltage drop, droop,
and EMI.
The following guidelines must be paid attention.
Output capacitor and ferrite beads should be placed as close to the USB connectors as possible to lower
impedance (mainly inductance) between the port and the capacitor and improve transient load performance.
The UTC US223 should be placed as close as possible to the output port to limit switching noise.
Ceramic bypass capacitors should be placed as close as possible to the VIN pins of the UTC US223
Keep all VBUS traces as short as possible and use at least 50-mil, 2 ounce copper for all VBUS traces.
Avoid VIAS as much as possible. If VIAS are necessary, make them as large as feasible.
Place a ground plane under all circuitry to lower both resistance and inductance and improve DC and
transient performance (Use a separate ground and power plans if possible).
Place cuts in the ground plane between ports to help reduce the coupling of transients between ports.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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共有リンク

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部品番号部品説明メーカ
US222

0.5A TO 2.0A HIGH-SIDE POWER DISTRIBUTION SWITCHES

Unisonic Technologies
Unisonic Technologies
US223

HIGH-SIDE POWER SWITCHES

Unisonic Technologies
Unisonic Technologies


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