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Unisonic Technologies

US1528 Datasheet Preview

US1528 Datasheet

CMOS IC

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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
1 of 8
QW-R502-457.b




Unisonic Technologies

US1528 Datasheet Preview

US1528 Datasheet

CMOS IC

No Preview Available !

US1528
„ PIN CONFIGURATION
Preliminary
CMOS IC
„ PIN DESCRIPTION
PIN NO.
1
2, 3
4
5
6, 7, 8
PIN NAME
GND
IN
EN
EN
FLG
OUT
DESCRIPTION
Ground.
Input Supply: Output MOSFET source, which also supplies IC's internal circuitry.
Connect to positive supply.
Active-High switch enable input. A logic low turns on the switch.
Active-Low switch enable input. A logic low turns on the switch.
Open-Drain Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent,
thermal shutdown and UVLO.
Switch Output: Output MOSFET drain. Typically connect to switched side of load.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 8
QW-R502-457.b


Part Number US1528
Description CMOS IC
Maker Unisonic Technologies
Total Page 8 Pages
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