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US211 데이터시트 PDF




Unisonic Technologies에서 제조한 전자 부품 US211은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 US211 기능
기능 HIGH-SIDE POWER SWITCHES
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US211 데이터시트, 핀배열, 회로
UNISONIC TECHNOLOGIES CO., LTD
US211/A/B/C
Preliminary
HIGH-SIDE POWER SWITCHES
WITH FLAG
DESCRIPTION
The UTC US211/A/B/C series are 80mhigh-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 80mwhich 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 US211/A, single port)
and 1.3A /1.5A (UTC US211B/C, dual ports).
FEATURES
* 80m(Typ) N-Channel MOSFET
* Supply Current:
Switch On : 25μA(Typ)
Switch Off : 1μA (Typ)
* Load Current 500mA for US211 and 1.0A for US211A/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
US211XXL-AF5-R
US211XXG-AF5-R
Package
SOT-25
CMOS IC
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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QW-R502-A67.a
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US211 pdf, 반도체, 판매, 대치품
US211/A/B/C
Preliminary
CMOS IC
APPLICATION INFORMATION
Input and Output
VIN (input) is the power source connection to the internal circuitry and the drain of the MOSFET. VOUT (output) is
the source of the MOSFET. In a typical application, current flows through the switch from VIN to VOUT toward the load.
Because the MOSFET is bidirectional when on, if VOUT is greater than VIN, current will flow from VOUT to VIN
There is no a parasitic body diode of N-MOSFET between the drain and source compared to a normal MOSFET,.
The US211 can protect damage from reverse current flow if VOUT being externally forced to a higher voltage than VIN
when the output disabled (VEN > 2V).
Enable Input
The switch will be disabled when the EN pin is in a logic low/high condition. During this condition, the internal
circuitry and MOSFET are turned off, reducing the supply current to 0.1μA typical. Floating the EN may cause
unpredictable operation. EN should not be allowed to go negative with respect to GND. The EN pin may be directly
tied to VIN (GND) to keep the part on.
Soft Start for Hot Plug-In Applications
When hot-plug events occur, the soft start is used to eliminate the upstream voltage droop due to the inrush
current. The soft-start protects power supplies from damage caused by highly capacitive loads.
Fault Flag
The fault flag is an open-drained output of an N-channel MOSFET. The flag drops low to indicate fault conditions:
current limit, thermal shutdown or VOUT < VIN 1V. In order to reduce energy drain, a large pull-up resistor is required.
100kpull-up resistor is recommended for most applications.
In the case of over current condition, the fault flag is active only if the flag response delay time (tD) has elapsed.
This ensures that FLG is asserted only upon valid over-current conditions and that erroneous error reporting is
eliminated. For example, false over-current conditions may occur during hot-plug events when extremely large
capacitive loads are connected and causes a high transient inrush current that exceeds the current limit threshold.
The FLG response delay time tD is typically 10ms.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 8
QW-R502-A67.a
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US211 전자부품, 판매, 대치품
US211/A/B/C
TEST CIRCUIT
Preliminary
VIN CI
VCTL
RFG
VIN FLG
UTC
US211/A/B/C
CTL
VOUT
GND
VFLG
VOUT
CO RL IL
Fig.4 UVLO at Rising & Falling
CMOS IC
S2
VIN CI
RFG
VIN FLG
UTC
US211/A/B/C
CTL
VOUT
GND
CO
IOUT
A
S3
VFLG
VOUT
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-A67.a
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