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 (1)Packing Type (2)Package Type (3)Output Voltage Code (4)Halogen Free
Package SOP-8 SOP-8
Packing Tape Reel Tube
(1) R: Tape Reel, T: Tube (2) S08: SOP-8 (3) xx: Refer to Marking Information (4) Halogen Free, L: Lead Free
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PIN CONFIGURATION
Preliminary
CMOS IC
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 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 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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BLOCK DIAGRAM
Preliminary
CMOS IC
2 FLAG LOGIC
FLG1
CTL1
1
Control
8
OUT1
Gate Control
Current Limit Thermal Shutdown Current Limit
GND
6
UVLO
7
IN
Gate Control 5 3 FLAG LOGIC OUT2 FLG2
CTL2
4
Control
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PARAMETER Input Voltage Flag Voltage Control Input Voltage Output Voltage Flag Current Output Current DC
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°C, Unless otherwise specified)
SYMBOL VIN VFLG VCTL VOUT IFLG IOUT VIN= VCTL=5 V RATINGS –0.3 ~ +6 –0.3 ~ +6 –0.3 ~ +6 VIN+ 0.3 50 +0.5 –0.1 UNIT V V V V mA
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.
RECOMMENDED OPERATING RANGE
PARAMETER Input Voltage Operating Temperature SYMBOL VIN TA RATINGS +4 ~ +5.5 0 ~ +70 UNIT V °C
ELECTRICAL CHARACTERISTICS (TA = +25°C, VIN = +5V, Unless otherwise specified)
PARAMETER DC CHARACTERISTICS Circuit Current Low-level Input Voltage High-level Input Voltage Input Current of CTL pin 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 SYMBOL 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 MIN TYP 1 1 2.0 0.01 0.01 100 0.6 0.9 10 0.01 2.5 2.3 0.2 1 1 130 10 1.25 25 1 2.8 2.6 0.3 12 10 20 MAX 5 1.5 1.0 UNIT μA mA V V μA μA mΩ μA A Ω μA V V V ms μs μs μs
IDD VIL VIH ICTL RON IO LEAK ITH RONF IO LEAK F VUVLO
2.2 2.0 0.1 2.5 5 20
tRISE tFALL tOVER tCTL
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TIMING DIAGRAM
Preliminary
CMOS IC
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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FUNCTION DESCRIPTION
Preliminary
CMOS IC
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) GND 5V Flg (Output) CTL (Input) GND 5V GND Thermal shutdown operating temperature (down) Stand-by Non-stand-by
Tch
Thermal shutdown operating temperature (up)
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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