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Dual USB Power Control Switch with Over-Current/Voltage Protection PA3526
Features
2 independent switches Individual open-drain fault flag pins 2.7V to 5.5V input 500mA continuous load current per port 140m maximum on-resistance 1A Maximum Standby Supply Current Thermal shutdown Undervoltage lockout (UVLO) Active-high or active-low enable versions
Applications

USB Power Management Hot plug-in power supplies Battery - Charger circuits
Ordering Information
Part Number PA3526-H PA3526-L Enable Active High Active Low Temperature Range -40C to +85C -40C to +85C
Pin configuration PA3526X
8(OUTA) (ENA) 1 (FLGA) 2 LOGIC, CHARGE PUMP 7(IN) (FLGB) 3 (ENB) 4 LOGIC, CHARGE PUMP 5(OUTB) 6 (GND)
Pin Description
Pin Number 1, 4 2, 3 6 7 8, 5 Pin Name EN(A/B) FLG(A/B) GND IN OUT(A/B) Pin Function Enable (Input): Logic-compatible enable input. High input > 2.1V typical. Low input <1.9V typical (H active high, L active low). Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, and thermal shutdown, UVLO, OVLO. Ground. Supply Input: Output MOSFET drain. Also supplies IC's internal circuitry. Switch Output: Output MOSFET source. Typically connect to switched side of load.
Detailed description
Power switch The power switch is an N-channel MOSFET with a maximum on-state resistance of 500 m (VIN=5V). The power switch supplies a minimum of 100 mA per switch. Enable (EN or EN) The logic enable disables the power switch and the bias for the charge pump, driver, and other circuitry to reduce the supply current to less than 1A when a logic high is present on EN (PA3526-L) or a logic low is present on EN (PA3526-H). The enable input is compatible with both TTL and CMOS logic levels. Driver The driver controls the gate voltage of the power switch. To limit large current surges the driver incorporates circuitry that controls the rise times and fall times of the output voltage. Charge pump An internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above the source. Fault Flag FLG (A/B) FLG is an N-channel, open-drain MOSFET output. The fault-flag is active (low) for one or more of the following conditions: under-voltage, current limit, or thermal shutdown. The flag output MOSFET is capable of sinking a 10 mA load to typically 100mV above ground. Multiple FLG pins may be "wire NO Red" to a common pull-up resistor. Thermal shutdown 0 An internal thermal-sense circuit shuts off the power switch when the junction temperature rises to approximately 150 C. Hysteresis is built into the thermal sense circuit. Over-voltage lockout OVLO (over-voltage lockout) prevents the output MOSET from turning on if VIN exceeds approximately 6.5V. Over voltage detection functions only when at least one switch is enabled
2929 S. Fair Lane, Tempe, AZ 85282 Tel: (602) 414-5122. Fax: (602) 414--5141 www.protekanalog.com
Dual USB Power Control Switch with Over-Current/Voltage Protection PA3526
Current sense (CS) A sense FET monitors the current supplied to the load. When an overload or short circuit is encountered, the current-sense circuitry sends a control signal to the driver. The driver in turn reduces the gate voltage and sends the power FET into its saturation region, which switches the output into a constant current mode. Under-voltage lockout UVLO (under-voltage lockout) prevents the output MOSFET from turning on until VIN exceeds approximately 2.3V. In the under-voltage state, the FLAG will be low. After the switch turns on, if the voltage drops below approximately 2.1V, UVLO shuts off the output MOSFET and signals fault flag. Under-voltage detection functions only when at least one switch is enabled.
Absolute Maximum Ratings (Note1)
Parameter Supply Voltage (VIN) Fault Flag Voltage (VFLG) Fault Flag Current (IFLG) Output Voltage (VOUT) Output Current (IOUT) Control input (VEN) Storage Temperature (TS) Maximum 6 6 50 6 Internally Limited -0.3 to 12 -65 to 150 Units V mA V A V
0
Operating Ratings (Note 2)
Parameter Supply Voltage (VIN) Ambient Operating Temperature (TA) PA3526 2.7V to 5.5V -400C to +850C
C
Electrical Characteristics
T = 25oC, VIN = +5V; unless noted
Parameter Supply Current 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 Continuous Load Current Short-Circuit Current Limit Current-Limit Threshold Over temperature Shutdown Threshold Error Flag Output Resistance VIN= 5V, IOUT=500mA , each switch VIN= 2,7V, IOUT=500mA , each switch RL=10, each output RL=10, each output RL=10, each output RL=10, each output each output (output disabled) each output each output (enable into load) VOUT=4.0V each output (enable into load) VOUT=0.1V Ramped load applied to enabled output, VOUT < 4.0 V TJ increasing TJ decreasing VIN=5,0V, IL=10mA VIN=3,3V, IL=10mA VIN=2,7V, IL=10mA Error Flag Off Current UVLO Threshold OVLO Threshold VFLAG=5 V VIN increasing VIN decreasing VIN increasing VIN decreasing 0.5 0.5 Condition Note 3, switch off, OUT = open, Note 3, all switches on, OUT = open, Low-to-high transition High-to-low transition, Note 3 VEN= 0V 5.5V Min Typ 0.5 120 2.1 1.9 0.01 1 100 140 0.5 1 1 1 20 20 10 1.2 1 1.6 135 125 10 11 12 0.01 2.3 2.1 6.5 6.3 1.9 1.5 2.2 Max 1 200 2.4 0.5 140 180 Units A V A pF m ms ms S S A A A A C 25 35 40 1 A V V
0.8 -0.5
Note 1: Exceeding the absolute maximum rating may damage the device. Note 2: The device is not guaranteed to function outside its operating rating Note 3: Off is 0.8V and on is 2.4V for the PA3526-H. Off is 2.4V and on is 0.8V for the PA3526-L. The enable input has approximately 200mV of hysteresis.
2929 S. Fair Lane, Tempe, AZ 85282 Tel: (602) 414-5122. Fax: (602) 414--5141 www.protekanalog.com
Dual USB Power Control Switch with Over-Current/Voltage Protection PA3526
Block Diagram
Pad Location PA3526
6 8 8 8 1 2 7 7 7 3 5 5 5 4
Pad Location Coordinates
N 1 2 3 4 5 5 5 6 7 7 7 8 8 8 ENA FLGA FLGB ENB OUTB OUTB OUTB GND IN IN IN OUTA OUTA OUTA Pad Name Pad size (m x m) 136 x 120 136 x 120 136 x 120 136 x 120 140 x 130 140 x 130 140 x 130 140 x 130 140 x 130 140 x 130 140 x 130 140 x 130 140 x 130 140 x 130 Coordinates, m X Y 323.5 220 1111.5 237.5 2187.5 237.5 2975.5 220 3079 1260.5 3079 1465.5 3079 1664 3079 1943.5 1650 1260.5 1650 1462.5 1650 1664 220 1259 220 1465.5 220 1664.5
Chip size 3.3 x 2.15 mm
2929 S. Fair Lane, Tempe, AZ 85282 Tel: (602) 414-5122. Fax: (602) 414--5141 www.protekanalog.com

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