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Número de pieza US1528
Descripción CMOS IC
Fabricantes Unisonic Technologies 
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UNISONIC TECHNOLOGIES CO., LTD
US1528
Preliminary
USB HIGH-SIDE POWER SWITCH
ADVANCE INFORMATION
„ DESCRIPTION
The UTC US1528 is an integrated high-side power switch. It is
designed particularly for self-powered and bus-powered USB (Universal
serial bus) applications.
The UTC US1528 meets the requirements of the USB. The low
on-resistance of the switch meets USB voltage drop requirements.
When the output load becomes higher than the current-limit threshold,
the UTC US1528 switches into constant- current mode and limits the
output current at 1.4A (TYP).
An open-drain flag, playing a role as the MOSFET output, is included
to indicate error conditions to the local USB controller. A thermal
shutdown circuit protects this device from catastrophic switch failure,
which is caused by increasing power dissipation when continuous heavy
loads or short circuit occurs. In addition, soft start is used to avoid the
momentary voltage drop generated on the upstream port that may occur
when the switch is enabled in bus-powered applications. A UVLO
(under-voltage lockout) circuit is used to keep the device off unless there
is a valid input voltage present, and an enable input that is compatible
with both 3.3V and 5V logic.
The UTC US1528 can be used for high-side power protection switch,
USB power management, USB host and self-powered hubs, hot plug-in
power supplies and battery-charger circuits.
„ FEATURES
* Open-Drain Fault Flag
* Low on-Resistance MOSFET: Typical 110m(at 5.0V)
* Operating Voltage Varying From 3.0V to 5.5V
* Output can be Forced Higher than Input when Operating in Off State.
* Slow Turn-On (Soft-Start) and Fast Turn-Off
* On-State Supply Current: 100 µA (TYP)
* Standby Supply Current: 1µA (TYP)
* Current Limit: 1.4A (TYP)
* Thermal Shutdown Protection Circuit
* UVLO (Under-Voltage Lockout): 2.4V (TYP)
* Logic Level Enable Pin, Available with Active-High/Low Version
„ ORDERING INFORMATION
Ordering Number
Package
US1528XG-S08-R
SOP-8
Packing
Tape Reel
CMOS IC
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
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US1528 pdf
US1528
Preliminary
CMOS IC
„ FUNCTIONAL DESCRIPTION
The UTC US1528 is high-side single channel power switch; it has an enable input in active low. Fault
conditions turn off or inhibit turn-on of the output transistors.
Input and Output
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 driving 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 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. The reaction to an overcurrent is measured with
the following scenarios:
Switch Enabled into Heavy Load
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.
Heavy Load Applied 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.
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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