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PDF US2076A Data sheet ( Hoja de datos )
| Número de pieza | US2076A | |
| Descripción | DUAL USB HIGH-SIDE POWER SWITCH | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
US2076A
Preliminary
DUAL USB HIGH-SIDE POWER
SWITCH
DESCRIPTION
The UTC U2076A is a dual integrated high-side power switch
particularly designed for self-powered and bus-powered Universal
Serial Bus (USB) applications.
The UTC U2076A meets the requirements of the USB. The low
on-resistance of the switch satisfies USB voltage drop requirements.
Fault current is limited to typically 750mA, well below the UL 25VA
safety requirement. Flag outputs are available to indicate fault
conditions to the local USB controller. In addition, soft start can
eliminate the momentary voltage drop which is generated on the
upstream port that may occur when the switch is enabled in
bus-powered applications.
This device has independent functions enable and flag, and an
enable input is compatible with both 3.3V and 5V logic.
The UTC U2076A includes protection circuits. Thermal shutdown
circuit is designed to protect the device from being damaged when
high-current loads exist. UVLO (Under-voltage lockout) is used to keep
the device off unless there is a valid input voltage present.
The UTC U2076A is use in applications, such as USB host and
self-powered hubs, bus-powered hubs, hot plug-in power supplies,
and battery-charger circuits.
FEATURES
* Continuous Load Current: 500mA (MIN.) per Channel
* Off-State Supply Current: 1µA (TYP.)
* Output can be Forced Higher than Input (Off-State)
* Current Limit up to 1.25A (MAX.)
* Input Supply Voltage: 3.0V ~ 5.5V
* On-State Supply Current: 110µA (TYP.)
* Thermal Shutdown Protection Circuit
* UVLO (Undervoltage Lockout): 2.4V (TYP.)
* Open-Drain Fault Flag
* 1ms Turn-On (Soft-Start) and Fast Turn-Off
* Compliant to USB Specifications
* Available with Active-Low Enable
ORDERING INFORMATION
Ordering Number
US2076AG-S08-R
Package
SOP-8
Packing
Tape Reel
CMOS IC
SOP-8
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
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QW-R502-446.a
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US2076A
Preliminary
CMOS IC
FUNCTIONAL DESCRIPTION
The UTC US2076A is dual high-side switch with active-low enable inputs. Fault conditions turn off or inhibit
turn-on one or both of the output transistors, controlling by the type of fault, and the FLG pin is pulled to ground by
being activated the open-drain error flag transistors.
Input and Output
IN (input) is the power supply connection to the logic circuitry and the source of the output MOSFET. OUT(output)
is the drain of the output A or B MOSFET.
IN pin (input) is the power supply connection to the logic circuitry and the source of the output MOSFET. OUT pin
(output) is the output MOSFET’s drain. Current flows through the switch from IN pin to OUT pin toward the load in
many applications. All OUT pins must be connected together to the load.
The output MOSFET and driver circuit are also designed to allow the MOSFET drain to be externally forced to a
higher voltage than the source (VOUT > VIN) when the switch is off. This avoids undesirable drain-to-body diode
current flow by connecting the body to the most positive voltage. If VOUT >VIN when switch is enabled, current will
flow from VOUT to VIN.
Thermal Shutdown
Thermal shutdown is designed to prevent this device from being damaged due to excessive power dissipation. It is
used to turn off the output MOSFET if the temperature is higher than135°C, 10°C of hysteresis prevents the switch
from turning on until the die temperature drops to 125°C. Thermal shutdown circuit functions only when the switch is
enabled.
Undervoltage Lockout
UVLO (Undervoltage Lockout) turns off the MOSFET switch and signals the fault flag pin once the input voltage
falls below 2.3V (TYP.) and if the input voltage exceeds 2.5V (TYP.), the switch will be turned on. UVLO detection
functions only when the switch is enabled.
Current Sensing and Limiting
The current limit threshold is fixed internally, allowing a 0.5A minimum current to flow through the output MOSFET.
However, the current limit threshold can prevent the output MOSFET and external load from being damage. A
current sense circuit protects the MOSFET switch’s output current. If output current becomes higher than the current
limit threshold, the output MOSFET switch is turned off and a fault flag is pulled low. The reaction to an overcurrent
is measured with the following scenarios:
Switch Enable into Heavy Load
If a switch is powered-on or enabled into a heavy load or short-circuit, the switch immediately goes into a
constant-current mode, reducing output voltage. The fault flag goes low until the load is reduced or thermal
shutdown occurs.
If the switch is powered on or enabled into a heavy load or short-circuit, the switch enters a constant-current mode
immediately, reducing the output voltage. The fault flag drops low until thermal shutdown occurs or the load is
reduced.
Heavy Load Applied Suddenly to Enabled Switch
When a heavy load is applied, a large-undesired transient current occurs which may damage the switch. Then the
current limit circuit may turn off the switch, folding back into constant-current mode. In that case, the fault flag falls
until the load is reduced.
Fault Flag
Fault flag is an open-drained output of an N-channel MOSFET. It drops low to indicate error conditions as follows:
current limiting, UVLO, or thermal shutdown. The flag output MOSFET is capable of sinking a 10mA load to typically
100mV above ground. Both flag pins may be "wire-NORed" to a common pull-up resistor.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 8
QW-R502-446.a
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| PDF Descargar | [ Datasheet US2076A.PDF ] | |
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