Datasheet

UNISONIC TECHNOLOGIES CO., LTD
US16855
Preliminary
CMOS IC
DUAL HIGH-SIDE SWITCH FOR
USB APPLICATION
„
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.
„
SOP-8
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
„
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.
US16855G-xx-S08-R
Package
Packing
SOP-8
SOP-8
Tape Reel
Tube
(1)Packing Type
(1) R: Tape Reel, T: Tube
(2)Package Type
(2) S08: SOP-8
(3)Output Voltage Code
(3) xx: Refer to Marking Information
(4)Halogen Free
(4) Halogen Free, L: Lead Free
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Copyright © 2011 Unisonic Technologies Co., Ltd
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US16855
Preliminary
„
PIN CONFIGURATION
„
PIN DESCRIPTION
PIN NO.
1, 4
2, 3
6
7
8, 5
„
PIN NAME
CTL1/CTL2
FLG1/FLG2
GND
IN
OUT1/OUT2
DESCRIPTION
Control : TTL Input
Over Current Detect Flag : Active-L, Nch open-drain
Ground
Power Supply : Source of MOSFET
Output of Switch : Drain of MOSFET
DESCRIPTION of UTC US16855 FUNCTION
CTL Input Logic
“H” active
„
CMOS IC
Switch Operation with Over-Current Detect
Switch Off regardless of CTL Input
TRUTH TABLE (H: High, L: Low, ON: Turn on, OFF: Turn off, X: H or L)
CTL1
H
H
L
L
H
H
X
X
FLG1
H
H
H
H
L
H
L
L
OUT1
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
CTL2
H
L
H
L
H
H
X
X
FLG2
H
H
H
H
H
L
L
L
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OUT2
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
Operating mode
Normal mode
Only OUT1 is ON
Only OUT2 is ON
Standby mode
Only OUT1 is over-current detect
Only OUT2 is over-current detect
TSD mode
UVLO mode
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„
Preliminary
CMOS IC
BLOCK DIAGRAM
CTL1
1
2
FLG1
8
OUT1
7
IN
5
OUT2
3
FLG2
FLAG
LOGIC
Control
Gate
Control
Current
Limit
GND
UVLO
6
Thermal
Shutdown
Current
Limit
Gate
Control
CTL2
4
Control
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FLAG
LOGIC
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Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°C, Unless otherwise specified)
PARAMETER
Input Voltage
Flag Voltage
Control Input Voltage
Output Voltage
Flag Current
Output Current
SYMBOL
VIN
VFLG
VCTL
VOUT
IFLG
DC
UNIT
V
V
V
V
mA
+0.5
–0.1
VIN= VCTL=5 V
A
Pulse Width ≤100μs Single Pulse
+3
Power Dissipation
PD
300
mW
Operating Temperature
TA
–40 ~ +85
°C
Storage Temperature
TSTG
–55 ~ +150
°C
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. The thermal shutdown circuit (operating temperature is more than 150 °C typ.) builds in this product.
„
IOUT
RATINGS
–0.3 ~ +6
–0.3 ~ +6
–0.3 ~ +6
VIN+ 0.3
50
RECOMMENDED OPERATING RANGE
PARAMETER
SYMBOL
VIN
TA
Input Voltage
Operating Temperature
„
RATINGS
+4 ~ +5.5
0 ~ +70
UNIT
V
°C
ELECTRICAL CHARACTERISTICS (TA = +25°C, VIN = +5V, Unless otherwise specified)
PARAMETER
DC CHARACTERISTICS
Circuit Current
SYMBOL
IDD
Low-level Input Voltage
High-level Input Voltage
VIL
VIH
Input Current of CTL pin
ICTL
Output MOSFET On Resistance
Output Leak Current
Over Current Detect Threshold
Flag Output Resistance
Flag Leak Current
Operating Voltage of Under
Voltage Locked Out Circuit
AC CHARACTERISTICS
Output Transition Rising Time
Output Transition Falling Time
Over Current Detect Delay Time
CTL Input Low-Level Time
RON
IO LEAK
ITH
RONF
IO LEAK F
VUVLO
tRISE
tFALL
tOVER
tCTL
TEST CONDITIONS
VCTL= 0V (both pin 1 & pin 4),
OUT = open
VCTL= VIN, OUT = open
CTL Pin
CTL Pin
VCTL= 0V
VCTL= VIN
TA= 0 ~ +70 °C, IOUT= 500 mA
TA= 0 ~ +70 °C
IL= 10 mA
VFLAG= 5 V
VIN: Up
VIN: Down
Hysteresis
RL= 10Ω each output
RL= 10Ω each output
CTL : H→L→H
UNISONIC TECHNOLOGIES CO., LTD
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MIN
TYP
MAX
1
5
1
1.5
1.0
0.01
0.01
100
1
1
130
10
1.25
25
1
2.8
2.6
0.3
2.0
0.6
2.2
2.0
0.1
2.5
5
20
0.9
10
0.01
2.5
2.3
0.2
12
10
20
UNIT
μA
mA
V
V
μA
μA
mΩ
μA
A
Ω
μA
V
V
V
ms
μs
μs
μs
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Preliminary
CMOS IC
TIMING DIAGRAM
Output Transition Rising Time (at ON)/Output Transition Falling Time (at OFF) at the timing of CTL changing “L” to
“H”/“H” to “L” for UTC US16855
Over Current Detect Delay Time/CTL Input Low-Level Time for UTC US16855
ITH
IOUT
VOUT
tOVER
FLG
90%
tCTL
CTL
90%
90%
Over Current Detect Delay Time/CTL Input Low-Level Time for UTC US16855
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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.).
5V
IN (Input)
GND
5V
Flg (Output)
GND
5V
CTL (Input)
GND
5V
OUT (Output)
GND
Over Current detect threshold
IOUT
Over current Detect
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Preliminary
CMOS IC
FUNCTION DESCRIPTION(Cont.)
THERMAL SHUTDOWN
The UTC US16855 is internally protected against excessive power dissipation by thermal shutdown protection
circuit. If device junction temperature rise above approximately 150℃, both switches are turned off, both fault FLAG
outputs are activated, and they goes low. Hysteresis ensures that both switches turned off by thermal shutdown will
not be turned on again until the die temperature is reduced to 145℃. When the thermal shutdown circuit is activated,
the output pins are in the OFF status. However, the UTC US16855 enters the standby status when CTL pins are all
inactive.
5V
IN (Input)
GND
5V
OUT (Output)
Stand-by
Non-stand-by
GND
5V
Flg (Output)
GND
5V
CTL (Input)
Tch
„
GND
Thermal shutdown operating
temperature (up)
Thermal shutdown operating
temperature (down)
TEST CIRCUIT
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„
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
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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www.unisonic.com.tw
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