UNISONIC TECHNOLOGIES CO., LTD
US2076A
Preliminary
DUAL USB HIGH-SIDE POWER SWITCH
DESCRIPTION
The UTC U2076A is a dual integrated high-side power switch particularly designed for self-powered and bus-powered Universal Serial Bus (USB) applications.
The UTC U2076A meets the requirements of the USB. The low on-resistance of the switch satisfies USB voltage drop requirements. Fault current is limited to typically 750mA, well below the UL 25VA safety requirement. Flag outputs are available to indicate fault conditions to the local USB controller. In addition, soft start can eliminate the momentary voltage drop which is generated on the upstream port that may occur when the switch is enabled in bus-powered applications.
This device has independent functions enable and flag, and an enable input is compatible with both 3.3V and 5V logic.
The UTC U2076A includes protection circuits. Thermal shutdown circuit is designed to protect the device from being damaged when high-current loads exist. UVLO (Under-voltage lockout) is used to keep the device off unless there is a valid input voltage present.
The UTC U2076A is use in applications, such as USB host and self-powered hubs, bus-powered hubs, hot plug-in power supplies, and battery-charger circuits.
FEATURES
* MOSFET with Low On-Resistance: 140mΩ
[email protected] per Channel * Continuous Load Current: 500mA (MIN.) per Channel * Off-State Supply Current: 1µA (TYP.) * Output can be Forced Higher than Input (Off-State) * Current Limit up to 1.25A (MAX.) * Input Supply Voltage: 3.0V ~ 5.5V * On-State Supply Current: 110µA (TYP.) * Thermal Shutdown Protection Circuit * UVLO (Undervoltage Lockout): 2.4V (TYP.) * Open-Drain Fault Flag * 1ms Turn-On (Soft-Start) and Fast Turn-Off * Compliant to USB Specifications * Available with Active-Low Enable
ORDERING INFORMATION
Ordering Number US2076AG-S08-R
Package SOP-8
Packing Tape Reel
CMOS IC
SOP-8
www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd
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QW-R502-446.a
US2076A
PIN CONFIGURATION
Preliminary
CMOS IC
PIN DESCRIPTION
PIN NO. 1, 4
2, 3 6 7
5, 8
PIN NAME EN (A/B)
FLG(A/B) GND IN
OUT(A/B)
DESCRIPTION Enable (Input): Logic-compatible enable input. Active – Low; Do Not Float. Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, UVLO, and thermal shutdown. Ground: Supply return. Supply Input: Output MOSFET source. Also supplies IC's internal circuitry. Connect to positive supply. Switch Output: Output MOSFET drain. Typically connect to switched side of load.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 8
QW-R502-446.a
US2076A
BLOCK DIAGRAM
Preliminary
CMOS IC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-446.a
US2076A
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Output Current Fault Flag Current
IOUT Internally Limited IFLG 50 mA
Fault Flag Voltage Supply Voltage
VFLG VIN
+6.0 +6.0
V V
Output Voltage Control Input
VOUT VEN
+6.0 -0.3 ~ 6
V V
Storage Temperature
TSTG
-65 ~ +150
°C
Note: 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.
OPERATING RATINGS
PARAMETER Supply Voltage Ambient Operating Temperature
SYMBOL VIN TOPR
RATINGS +3 ~ +5.5 -40 ~ +85
THERMAL DATA
PARAMETER Junction to Ambient
SYMBOL θJA
RATINGS 160
ELECTRICAL CHARACTERISTICS (VIN=+5V, TA=25°C, unless otherwise specified.)
UNIT V °C
UNIT °C/W
PARAMETER
Supply Current (Note)
Enable Input Threshold
Enable Input Current
Enable Input Capacitance
Switch Resistance
Output Turn-On Delay Output Turn-On Rise Time Output Turn-Off Delay Output Turn-Off Fall Time Output Leakage Current Short Circuit Current Limit Overtemperature Shutdown Threshold
Error Flag Output Resistance
Error Flag Off Current
UVLO Threshold
SYMBOL
TEST CONDITIONS
IS(OFF) switch off, OUT = open
IS(ON) switch on, OUT = open VIH low to high transition
VIL high to low transition
IEN
VEN = VOH(min) = 2.4V VEN = VOL(max) = 0.8V
RON
VIN = 5V VIN = 3V
tON(DLY) RL = 10Ω each output
tRISE RL = 10Ω each output
tOFF(DLY) RL = 10Ω each output
tOFF RL = 10Ω each output
IO(LEAK) each output
ISHORT each output
OTThreshold
TJ TJ
increasing decreasing
VIN = 5V, IL=10mA
VIN = 3.3V, IL =10mA
VFLAG = 5V
VUVLO
VIN = increasing VIN = decreasing
MIN TYP MAX UNIT
25 μA
110 μA
2.4 2.5 V
1.0 2.2
V
0.01 1
μA
0.01 1
μA
1 pF
100 mΩ
140 mΩ
1 ms
0.5 ms
1 20 μs
1 20 μs
10 μA
0.5 0.75 1.25 A
135 °C
125 °C
10 Ω
15 Ω
0.01 1
μA
2.5 V
2.3 V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 8
QW-R502-446.a
US2076A
Preliminary
CMOS IC
FUNCTIONAL DESCRIPTION
The UTC US2076A is dual high-side switch with active-low enable inputs. Fault conditions turn off or inhibit turn-on one or both of the output transistors, controlling by the type of fault, and the FLG pin is pu.