LP2992ILDX-3.3 datasheet(5/15 Pages) NSC

Part #	LP2992ILDX-3.3

Description	Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and LLP Packages Designed for Use with Very Low ESR Output Capacitors

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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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. Un-

less otherwise specified: V

IN =VO(NOM) + 1V, IL = 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2V.

Symbol

Parameter

Conditions

Typ

LP2992AI-X.X

LP2992I-X.X

Units

(Note 6)

Min

Max

Min

Max

I

ON/OFF

ON/OFF Input Current

V

ON/OFF = 0

0.01

−2

µA

V

ON/OFF =5V

5

15

e

n

Output Noise

BW = 300 Hz to 50 kHz,

Voltage (RMS)

C

OUT =10µF

30

µV

C

BYPASS =10nF

Ripple Rejection

f = 1 kHz, C

BYPASS =10nF

45

dB

C

OUT =10µF

I

O(SC)

Short Circuit Current

R

L = 0 (Steady State)

400

mA

(Note 9)

I

O(PK)

Peak Output Current

V

OUT

≥ V

o(NOM) −5%

350

mA

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the

device outside of its rated operating conditions.

Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 1 and 3 for the LLP package, is 1 kV.

Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJ-A,

and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using:

Where the value of

θJ-A for the SOT-23 package is 220˚C/W in a typical PC board mounting and the LLP package is 65˚C/W. Exceeding the maximum allowable

dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.

Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2992 output must be diode-clamped to ground.

Note 5: The output PNP structure contains a diode between the VIN to VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT will

turn on this diode.

Note 6: 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 7: VIN must be the greater of 2.2V or VOUT(nom) + Dropout Voltage to maintain output regulation. Dropout voltage is defined as the input to output differential

at which the output voltage drops 2% below the value measured with a 1V differential.

Note 8: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.

Note 9: The LP2992 has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as VOUT is

forced to ground (see Typical Performance Characteristics curves).

www.national.com

5

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