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LT1963EQ-2.5 Datasheet(PDF) 11 Page - Linear Integrated Systems |
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LT1963EQ-2.5 Datasheet(HTML) 11 Page - Linear Integrated Systems |
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11 / 16 page  11 LT1963 Series 1963fa Figure 4. Ceramic Capacitor Temperature Characteristics APPLICATIO S I FOR ATIO TEMPERATURE ( °C) –50 40 20 0 –20 –40 –60 –80 –100 25 75 1963 F04 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 µF voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or micro- phone works. For a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. Overload Recovery Like many IC power regulators, the LT1963-X has safe operating area protection. The safe area protection de- creases the current limit as input-to-output voltage in- creases and keeps the power transistor inside a safe operating region for all values of input-to-output voltage. The protection is designed to provide some output current at all values of input-to-output voltage up to the device breakdown. When power is first turned on, as the input voltage rises, the output follows the input, allowing the regulator to start up into very heavy loads. During the start-up, as the input voltage is rising, the input-to-output voltage differential is small, allowing the regulator to supply large output currents. With a high input voltage, a problem can occur wherein removal of an output short will not allow the output voltage to recover. Other regulators, such as the LT1085, also exhibit this phenomenon, so it is not unique to the LT1963-X. The problem occurs with a heavy output load when the input voltage is high and the output voltage is low. Com- mon situations are immediately after the removal of a short-circuit or when the shutdown pin is pulled high after the input voltage has already been turned on. The load line for such a load may intersect the output current curve at two points. If this happens, there are two stable output operating points for the regulator. With this double inter- section, the input power supply may need to be cycled down to zero and brought up again to make the output recover. Output Voltage Noise The LT1963 regulators have been designed to provide low output voltage noise over the 10Hz to 100kHz bandwidth while operating at full load. Output voltage noise is typi- cally 40nV/ √Hz over this frequency bandwidth for the LT1963 (adjustable version). For higher output voltages (generated by using a resistor divider), the output voltage noise will be gained up accordingly. This results in RMS noise over the 10Hz to 100kHz bandwidth of 14 µVRMS for the LT1963 increasing to 38 µVRMS for the LT1963-3.3. Higher values of output voltage noise may be measured when care is not exercised with regards to circuit layout and testing. Crosstalk from nearby traces can induce unwanted noise onto the output of the LT1963-X. Power supply ripple rejection must also be considered; the LT1963 regulators do not have unlimited power supply rejection and will pass a small portion of the input noise through to the output. Figure 3. Ceramic Capacitor DC Bias Characteristics DC BIAS VOLTAGE (V) 1963 F03 20 0 –20 –40 –60 –80 –100 0 4 8 10 26 12 14 X5R Y5V 16 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 µF |
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