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AIC1742 Datasheet(PDF) 9 Page - Analog Intergrations Corporation |
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AIC1742 Datasheet(HTML) 9 Page - Analog Intergrations Corporation |
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9 / 12 page  AIC1742 9 DETAILED DESCRIPTION OF TECHNICAL TERMS DROPOUT VOLTAGE (VDROP) The dropout voltage is defined as the difference between the input voltage and output voltage at which the output voltage drops 100mV. Below this value, the output voltage will fall as the input voltage reduces. It depends on the load current and junction temperature. LINE REGULATION Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. The line regulation is specified as the input voltage changes from VIN = VOUT + 1V to VIN = 8V and IOUT = 1mA. LOAD REGULATION Load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes. A pulsed measurement with an input voltage set to VIN = VOUT + VDROP can minimize temperature effects. The load regulation is specified by the output current ranging from 0.1mA to 150mA. QUIESCENT CURRENT (IQ) Quiescent current is the current flowing through ground pin with no output load. GROUND CURRENT (IGND) Ground current is the current flowing through the ground pin with output load. STANDBY CURRENT (ISTBY) Standby current is the current flowing into the regulator when the output is shutdown by setting VSHDN at 0V and VIN at 8 V. CURRENT LIMIT (IIL) Current limiting of AIC1742 monitors and controls the maximum output current, in case of a shorted output. It protects device from the damage resulting from any unexpected current. RIPPLE REJECTION (RR) Ripple rejection is the ability of the regulator to reduce voltage ripple, which comes from input, at output terminal. It is specified with a signal of 0.5VP-P at 1KHz frequency applying to input, output capacitor at 2.2 µF as well as a noise bypass of 0.1 µF. Ripple rejection, expressed in dB, is the ratio of output ripple to input. THERMAL PROTECTION Thermal sensor protects device when the junction temperature exceeds TJ= +155ºC. It signals shutdown logic, turning off pass transistor and allowing IC to cool down. After the IC’s junction temperature cools by 15ºC, the thermal sensor will turn the pass transistor back on. Thermal protection is designed to protect the device in the event of fault conditions. For a continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ= 150ºC, or damage may occur to the device. |
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