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LP2956AMJ-QML Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LP2956AMJ-QML Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 16 page Electrical Characteristics (Continued) Limits in standard typeface are for T J = 25˚C, and limits in boldface type apply over the full operating temperature range. Lim- its are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise specified: V IN = 6V, CL = 2.2 µF (Main Output) and 10 µF (Auxiliary Output), Feedback pin is tied to 5V Tap pin, C IN = 1 µF, VSD = 0V, Main Output pin is tied to Output Sense pin, Auxiliary Output is programmed for 5V. The main regulator output hasa1mA load, the auxiliary regulator output has a 100 µA load. Symbol Parameter Conditions Typical LP2956AI LP2956I Units Min Max Min Max AUXILIARY COMPARATOR HYST Hysteresis 6 mV I OH Output “HIGH” Leakage V OH = 30V 0.01 1 1 µA V IN (COMP) = 1.3V 22 V OL Output “LOW” Voltage V IN (COMP) = 1.1V 150 250 250 mV I O(COMP) = 400 µA 400 400 I B Input Bias Current 0 ≤ V IN (COMP) ≤ 5V 10 −30 30 −30 30 nA −50 50 −50 50 GROUND PIN CURRENT I GND Ground Pin Current I L (Main Out) = 1 mA 170 250 250 µA (Note 15) I L (Aux. Out) = 0.1 mA 280 280 I L (Main Out) = 50 mA 1.1 2 2 I L (Aux. Out) = 1mA 2.5 2.5 I L (Main Out) = 100 mA 3 6 6 I L (Aux. Out) = 1mA 88 I L (Main Out) = 250 mA 16 28 28 mA I L (Aux. Out) = 1mA 33 33 I L (Main Out) = 1mA 3 6 6 I L (Aux. Out) = 50 mA 88 I L (Main Out) = 1mA 6 8 8 I L (Aux. Out) = 75 mA 10 10 I GND Ground Pin Current V IN = 4.5V 325 325 at Dropout (Note 15) I L (Main Out) = 0.1 mA 270 350 350 I L (Aux. Out) = 0.1 mA µA I GND Ground Pin Current No Load on Either Output 120 180 180 at Shutdown (Note 15) I (SD IN) ≥ 1µA 200 200 Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de- vice outside of its rated operating conditions. Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, T J(max), the junction-to-ambient thermal resistance, θ J-A, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: P(max) = . Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. See Application Hints for additional information on heat sinking and thermal resistance. Note 3: When used in dual-supply systems where the regulator load is returned to a negative supply, the output voltage must be diode-clamped to ground. Note 4: May exceed the input supply voltage. Note 5: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 6: Load regulation is measured at constant junction temperature using low duty cycle pulse testing. Two separate tests are performed, one for the range of 100 µA to 1 mA and one for the 1 mA to 250 mA range. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential. At very low values of programmed output voltage, the input voltage minimum of 2V (2.3V over temperature) must be observed. Note 8: Thermal regulation is the change in output voltage at a time T after a change in power dissipation, excluding load or line regulation effects. Specifications are for a 200 mA load pulse at VIN = 20V (3W pulse) for T = 10 ms on the Main regulator output. For the Auxiliary regulator output, specifications are for a 66 mA load pulse at VIN = 20V (1W pulse) for T = 10 ms. Note 9: Connect a 0.1 µF capacitor from the output to the feedback pin. Note 10: Load regulation is measured at constant junction temperature using low duty cycle pulse testing. Two separate tests are performed, one for the range of 100 µA to 1 mA and one for the 1 mA to 75 mA range. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 11: Dropout dectection comparator thresholds are expressed as changes in a 5V output. To express the threshold voltages in terms of a differential at the Feedback terminal, divide by the error amplifier gain = VOUT/V REF. www.national.com 5 |
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