Dual USB Power Control Switch with
Over-Current/Voltage Protection
PA3526
Features
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2 independent switches
Individual open-drain fault flag pins
2.7V to 5.5V input
500mA continuous load current per port
140m鈩?maximum on-resistance
1碌A(chǔ) Maximum Standby Supply Current
Thermal shutdown
Undervoltage lockout (UVLO)
Active-high or active-low enable versions
Applications
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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
-40擄C to +85擄C
-40擄C to +85擄C
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鈥檚 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惟 (V
IN
=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 1碌A(chǔ) 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 鈥渨ire NO Red鈥?to a common pull-up resistor.
Thermal shutdown
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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 V
IN
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鈥?122. Fax: (602) 414--5141
www.protekanalog.com
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