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US16855 Schematic ( PDF Datasheet ) - Unisonic Technologies

Teilenummer US16855
Beschreibung DUAL HIGH-SIDE SWITCH
Hersteller Unisonic Technologies
Logo Unisonic Technologies Logo 




Gesamt 8 Seiten
US16855 Datasheet, Funktion
UNISONIC TECHNOLOGIES CO., LTD
US16855
Preliminary
DUAL HIGH-SIDE SWITCH FOR
USB APPLICATION
CMOS IC
„ DESCRIPTION
The UTC US16855 is a dual channel power switch with
independent enable and flag functions optimized for bus-powered
Universal Serial Bus (USB) and self-powered applications.
This product satisfies USB voltage drop requirement with soft
start which eliminates the momentary voltage drop on the upstream
port that may occur.
In addition, the UTC US16855 is equipped with over-temperature
and over-current detectors and each flag output is available to
indicate fault conditions independently to the USB controller. The
UTC US16855 is available in active-high versions in 8-pin SOP
package.
„ FEATURES
* 4V ~ 5.5V operating range
* Two P-channel power MOSFET control switch
* Over-current protection
* Under-voltage lockout circuit
* Thermal shutdown circuit
* Soft-start circuit
* Flag indicates fault conditions
SOP-8
„ ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
US16855L-S08-R
US16855G-S08-R
US16855L-S08-T
US16855G-S08-T
Note: xx: Output Voltage, refer to Marking Information.
Package
SOP-8
SOP-8
US16855G-xx-S08-R
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Halogen Free
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8
(3) xx: Refer to Marking Information
(4) Halogen Free, L: Lead Free
Packing
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
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QW-R502-558.a






US16855 Datasheet, Funktion
US16855
Preliminary
CMOS IC
„ FUNCTION DESCRIPTION
UNDER VOLTAGE LOCKED OUT
UVLO prevents malfunction of the switch because of voltage variation. When input voltage exceeds 2.5V (typical),
the output MOSFET turns on. If input voltage drops below 2.3V (typical), UVLO shuts off the both output MOSFET
switches and signals the FLAG.
POWER ON AND OFF
The UTC US16855 performs a soft-start operation on power application, which is to prevent an over-current or
inrush-current from flowing through the switch from IN to OUTX towards to the load, while the high-capacity
capacitor is connected to the OUTX.
OVER CURRENT DETECT
The specification of over current detect is 0.6 ~ 1.25 A (typ. 900mA) in this IC. (500 mA max. in USB standard)
This function is that flag-pin turns to Low-level and reports to the USB controller when over current is detected.
At this time, output of IC is operated as followed.
Output turns to off, and isn't based on the state of CTL-pin.
When CTL-pin turns to non-active, FLG-pin returns to High-level and Output-pin turn to OFF-state.
Immediately the controller should be inputted non-active level to CTL-pin after detecting FLG = “L” not to reach to
the state of thermal shutdown.
Then, in the case of FLG-pin is High-level and CTL-pin is active level, Output-pin turns to ON-state.
To prevent from detecting wrongly the current to the moment, over current detect delay time is set up.
This delay time is 10 ms (typ.).
IN (Input)
Flg (Output)
CTL (Input)
OUT (Output)
5V
GND
5V
GND
5V
GND
5V
GND
Over Current detect threshold
IOUT
Over current Detect
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-558.a

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