LP2956 datasheet(5/16 Pages) NSC

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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

Output “HIGH” Leakage

OH = 30V

0.01

µA

IN (COMP) = 1.3V

Output “LOW” Voltage

IN (COMP) = 1.1V

150

250

O(COMP) = 400 µA

400

Input Bias Current

≤ V

IN (COMP) ≤ 5V

−30

−50

GROUND PIN CURRENT

GND

Ground Pin Current

L (Main Out) = 1 mA

170

250

µA

(Note 15)

L (Aux. Out) = 0.1 mA

280

L (Main Out) = 50 mA

1.1

L (Aux. Out) = 1mA

2.5

L (Main Out) = 100 mA

L (Aux. Out) = 1mA

L (Main Out) = 250 mA

L (Aux. Out) = 1mA

L (Main Out) = 1mA

L (Aux. Out) = 50 mA

L (Main Out) = 1mA

L (Aux. Out) = 75 mA

GND

Ground Pin Current

IN = 4.5V

325

at Dropout (Note 15)

L (Main Out) = 0.1 mA

270

350

L (Aux. Out) = 0.1 mA

µA

GND

Ground Pin Current

No Load on Either Output

120

180

at Shutdown (Note 15)

(SD IN) ≥ 1µA

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.

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