Electrical Characteristics

Limits in standard typeface are for T

range. Unless otherwise specified: V

Symbol

Parameter

Conditions

Typ(Note

4)

LP3961/4 (Note 5)

Units

Min

Max

ERROR FLAG COMPARATOR

V

T

Threshold

(Note 9)

10

516

%

V

TH

Threshold Hysteresis

(Note 9)

5

28

%

V

EF(Sat)

Error Flag Saturation

I

0.02

0.1

V

Td

Flag Reset Delay

1

µs

I

lk

Error Flag Pin Leakage

Current

1nA

I

max

Error Flag Pin Sink

Current

V

temp.)

1mA

AC PARAMETERS

PSRR

Ripple Rejection

V

C

V

60

dB

V

C

V

40

ρ

n(l/f

Output Noise Density

f = 120Hz

0.8

µV

e

n

Output Noise Voltage

(rms)

BW = 10Hz – 100kHz

150

µV

(rms)

BW = 300Hz – 300kHz

100

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is in-

tended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Charateristics. The guar-

anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: At elevated temperatures, devices must be derated based on package thermal resistance. The devices in TO220 package must be derated at

Note 3: The human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin.

Note 4: Typical numbers are at 25˚C and represent the most likely parametric norm.

Note 5: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).

Note 6: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP396X output must be diode-clamped to ground.

if the voltage at the output terminal is forced to be higher than the voltage at the input terminal. This diode can typically withstand 200mA of DC current and 1Amp

of peak current.

Note 8: Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the input line voltage. Output voltage load

regulation is defined as the change in output voltage from the nominal value due to change in load current. The line and load regulation specification contains only

the typical number. However, the limits for line and load regulation are included in the output voltage tolerance specification.

Note 9: Error Flag threshold and hysteresis are specified as percentage of regulated output voltage.

Note 10: Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value. Dropout voltage speci-

fication applies only to output voltages of 2.5V and above. For output voltages below 2.5V, the drop-out voltage is nothing but the input to output differential, since

the minimum input voltage is 2.5V.

Note 11: This specification has been tested for −40˚C

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