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PL0301 Datasheet(PDF) 8 Page - Power IC Ltd. |
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PL0301 Datasheet(HTML) 8 Page - Power IC Ltd. |
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8 / 12 page  PL0301 OPERATION Enable Input The PL0301 are ultra-low-noise, low-dropout, low- quiescent current linear regulators designed for space-restricted applications. These devices can supply loads up to 300mA. As shown in the Block Diagram, the PL0301 consists of a highly accurate band gap core, noise bypass circuit, error amplifier, P-channel pass transistor and an internal feedback voltage divider. The 1.0V band gap reference is connected to the error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass transistor gate is pulled low. This allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output. The output voltage is feedback through an internal resistor voltage divider connected to the OUT pin. An external bypass capacitor connected to BYP reduces noise at the output. Additional blocks include a current limiter, over temperature protection, and shutdown logic. The PL0301 features an active-high Enable input (EN) pin that allows on/off control of the regulator. The PL0301 bias current reduces to less than microampere of leakage current when it is shutdown. The Enable input is TTL/CMOS compatible threshold for simple logic interfacing. When EN is ‘H,’ the output voltage startup rising time is 135us typically at 300mA output current. Connect EN pin to IN pin for normal operation. Under Voltage Lockout When the input supply goes too low (below 2.0V) the PL0301 produces an internal UVLO (under voltage lockout) signal that generates a fault signal and shuts down the chip. This mechanism protects the chip from producing false logic due to low input supply. Quick Charging Mode The PL0301 has a quick charge block to get the reference up very quickly by charging the BYP capacitor with very high current when the chip comes out of shut down. This quick charge block stops charging the BYP capacitor when the reference reaches 95% of its nominal value and then the chip switches out of quick charging mode to normal operating mode. Internal P-Channel Pass Transistor The PL0301 feature a 1 Ω (typ) P-channel MOSFET pass transistor. This provides several advantages over similar designs using a PNP pass transistor, including longer battery life. The P-channel MOSFET requires no base drive, which considerably reduces quiescent current. PNP-based regulators waste considerable current in dropout when the pass transistor saturates. They also use high base-drive current under heavy loads. The PL0301 does not suffer from these problems and consume only 90 μA of quiescent current in light load and 220 μA in dropout condition. Over Temperature Protection Over temperature protection limits total power dissipation in the PL0301. When the junction temperature exceeds Tj= +165°C, the thermal sensor signals the shutdown logic and turns off the pass transistor. The thermal sensor turns the pass transistor on again after the IC’s junction temperature drops by 20 °C, resulting in a pulsed output during continuous thermal-overload conditions. Current Limit The PL0301 includes a current limiter. It monitors the output current and controls the pass transistor’s gate voltage to limit the output current under 676mA (typ). The output can be shorted to ground for an indefinite amount of time without damaging the part. Thermal-Overload protection is design to protect the PL0301 in the event of a fault condition. For continual operation, do not exceed the absolute maximum junction temperature rating of Tj = +150 °C. July 2007 www.picsemi.com © 2007 Power IC. All Rights Reserved. 8 |
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