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EC49121-XXNHFT21G Datasheet(PDF) 9 Page - E-CMOS Corporation |
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EC49121-XXNHFT21G Datasheet(HTML) 9 Page - E-CMOS Corporation |
9 / 13 page EC49121 600mA LDO with Fast Enable And Fast Discharge Function E-CMOS Corp. (www.ecmos.com.tw) Page 9 of 13 2009/01/12-2 Detail Description The EC49121 is a low-dropout linear regulator. The device provides preset 1.8V, 2.5V and 3.3V output voltages for output current up to 600mA. Adjustable output voltage and other mask options for special output voltages are also available. As illustrated in function block diagram, it consists of a 1.175V band gap (Fixed voltage type is 0.95V) reference, an error amplifier, a P-channel pass transistor and an internal feedback voltage divider. The band gap reference for fixed voltage types is connected to the error amplifier, which compares this reference with the feedback voltage and amplifies the voltage difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, which allows more current to pass to the output pin and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up to decrease the output voltage. The output voltage is feed back through an internal resistive divider (or external resistive divider for adjustable output voltage type) connected to OUT pin. Additional blocks include an output current limiter, thermal sensor, and shutdown logic. Internal P-Channel Pass Transistor The EC49121 features a P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFET require no base drive, which reduces quiescent current. PNP based regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The EC49121 does not suffer from these problems and consumes only 60μA (Typ.) of current consumption under heavy loads as well as in dropout conditions. Enable Function EN pin starts and stops the regulator. When the EN pin is switched to the power off level, the operation of all internal circuit stops, the build-in P-channel MOSFET output transistor between pins VIN and VOUT is switched off, allowing current consumption to be drastically reduced. The VOUT Pin enters the GND level through the internal discharge path between VOUT and GND pins. Fast Discharge Function The EC49121 fixed type has fast discharge Function on EN pin disable. When user turns off the device, its internal pull low resistor will discharge output capacitor charge. It’ll avoid other device to arise wrong motions. Simplified Application Circuit |
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