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PDF US3177 Datasheet ( Hoja de datos )

Número de pieza US3177
Descripción POWER DISTRIBUTION SWITCH
Fabricantes Unisonic Technologies 
Logotipo Unisonic Technologies Logotipo

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US3177 Hoja de datos, Descripción, Manual
UNISONIC TECHNOLOGIES CO., LTD
US3X77
POWER DISTRIBUTION SWITCH
DESCRIPTION
The UTC US3X77 is a power distribution switch and particularly
designed for self-powered and bus-powered Universal Serial Bus
(USB) applications.
The UTC US3X77 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 RDS(ON) of the MOSFET switch is as low as 100m. OC is
open-drain output report over-current or over-temperature event
which has deglitch typical 9ms timeout period typically 9ms.
The UTC US3X77 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
* 100mHigh-Side MOSFET
* Supply Current:
Switch on : 65μA(Typ)
Switch off : 1μA (Max)
* Accurate Current Limit with Foldback
* Deglitched Open-Drain Over-Current Flag Output (OC)
* No Reverse Current when Power Off
* Under voltage Lockout
* Operating Range:2.7V ~ 5.5V
* Output Shutdown Pull-low Resistor
ORDERING INFORMATION
Ordering Number
US3X77XG-S08-R
US3X77XG-S08-T
US3X77XG-SM1-R
US3X77XG-SM1-T
Package
SOP-8
SOP-8
MSOP-8
MSOP-8
CMOS IC
Packing
Tape Reel
Tube
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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US3177 pdf
US3X77
CMOS IC
FUNCTIONAL DESCRIPTION
OVERCURRENT PROTECTION
When the output load exceeds the current-limit threshold, The Over Current Protection will be triggered. The
typical current limit value of UTC US3077/US3277/US3377/US3477/US3577 is 1A, 1.5A, 2A, 2.5A. There is foldback
of current limit when short-circuit being encountered.
OC RESPONSE
The OC open-drain output is asserted (active low) when an over current or over-temperature shutdown condition
is encountered after a 9-ms deglitch timeout. The output remains asserted until the over-current or over-temperature
condition is removed.
THERMAL SHUTDOWN
Thermal shutdown protects UTC US3X77 from excessive power dissipation. If the die temperature exceeds 135°C,
the MOSFET switch is shut off. 20°C of hysteresis prevents the switch from turning on until the die temperature
drops to 115°C. Thermal shutdown circuit functions only when the switch is enabled.
UNDERVOLTAGE LOCKOUT (UVLO)
UVLO (under-voltage lockout) prevents the output MOSFET from turning on until IN (input voltage) exceeds 2.5V
typically. After the switch turns on, if the voltage drops below 2.3V typically, UVLO shuts off the output MOSFET.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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