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US3076 Datasheet(PDF) 7 Page - Unisonic Technologies

Part No. US3076
Description  DUAL USB HIGH-SIDE POWER SWITCH
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
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US3076 Datasheet(HTML) 7 Page - Unisonic Technologies

   
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US3076-US3376
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
7 of 7
www.unisonic.com.tw
QW-R502-424.f
FUNCTIONAL DESCRIPTION
Input and Output
IN pin (Input) is the power supply connection to the logic circuitry and the drain of the output MOSFET. OUT pin
(Output) is the source of the output MOSFET. Current flows through the switch from input to output toward the load
in a typical application. Both OUT pins must be connected together to the load.
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 when the if the temperature is higher than135°C, 20°C of hysteresis prevents
the switch turn on until the die temperature drops to 115°C. Thermal shutdown circuit functions only when the switch
is enabled.
Under-Voltage Lockout
UVLO (Under Voltage Lockout) turns off the MOSFET switch 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 Limiting
The current limit value is fixed internally, typically 2A, 1.5A, 1A, 0.75A for US3376/ US3276/ US3176/ US3076
respectively. There is foldback of current limit When VOUT is less than 1.5V, there is foldback of current limit.
OC Function
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.
APPLICATION INFORMATION
Supply Filtering
To avoid supply transients, 1μF bypass capacitor is strongly recommended to located between IN to GND.
Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance)
to damage internal control circuitry.
Input transients value must be not higher than the absolute maximum supply voltage (VIN max = 6V) even for a
short duration.
EN, the Enable Input
The enable pin, EN, must be driven logic high or logic low for a clearly defined input. The input is not allowed to
float, or unpredictable operation may be occurs. EN should not be allowed to go negative with respect to GND.
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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