National Semiconductor LP2992 Technical data

May 2005

LP2992 Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and LLP Packages

Designed for Use with Very Low ESR Output Capacitors

LP2992 Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and LLP

Packages

General Description

The LP2992 is a 250 mA, fixed-output voltage regulator designed to provide ultra low-dropout and low noise in battery powered applications.

™

Using an optimized VIP cess, the LP2992 delivers unequalled performance in all specifications critical to battery-powered designs:

Dropout Voltage: Typically 450 mV

5mV Ground Pin Current: Typically 1500 µA

75 µA Enhanced Stability: The LP2992 is stable with output ca-

pacitor ESR as low as 5 mΩ, which allows the use of ceramic capacitors on the output.

Sleep Mode: Less than 1 µA quiescent current when ON/ OFF pin is pulled low.

Smallest Possible Size: SOT-23 and LLP packages use absolute minimum board space.

Precision Output: 1% tolerance output voltages available (A grade).

Low Noise: By adding a 10 nF bypass capacitor, output noise can be reduced to 30 µV (typical).

Multiple voltage options, from 1.5V to 5.0V, are available as standard products. Consult factory for custom voltages.

1 mA load.

(Vertically Integrated PNP) pro-

250 mA load, and

Features

n Ultra low dropout voltage n Guaranteed 250 mA output current n Smallest possible size (SOT-23, LLP package) n Requires minimum external components n Stable with low-ESR output capacitor

1 µA quiescent current when shut down

n Low ground pin current at all loads n Output voltage accuracy 1% (A Grade) n High peak current capability n Wide supply voltage range (16V max) n Low Z n Overtemperature/overcurrent protection n −40˚C to +125˚C junction temperature range n Custom voltages available

: 0.3Ω typical (10 Hz to 1 MHz)

OUT

Applications

n Cellular Phone n Palmtop/Laptop Computer n Personal Digital Assistant (PDA) n Camcorder, Personal Stereo, Camera

Block Diagram

20029401

VIP™is a trademark of National Semiconductor Corporation.

Basic Application Circuit

LP2992

*ON/OFF input must be actively terminated. Tie to VINif this function is not to be used.

**Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for output (see Application Hints).

***Reduces output noise (may be omitted if application is not noise critical). Use ceramic or film type with very low leakage current (see Application Hints).

20029402

Connection Diagrams

5-Lead Small Outline Package (M5) 6-Lead LLP Package (LD)

Top View

20029403

See NS Package Number MF05A

For ordering information see Table 1

Top View

See NS Package Number NLDBA006

Outline Drawing LDE06A

20029446

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Ordering Information

TABLE 1. Package Marking and Ordering Information

Output Voltage

(V)

5-Lead Small Outline Package (M5)

1.5 A LP2992AIM5X-1.5 LFBA 3000 Units on Tape and Reel

1.5 A LP2992AIM5-1.5 LFBA 1000 Units on Tape and Reel

1.5 STD LP2992IM5X-1.5 LFBB 3000 Units on Tape and Reel

1.5 STD LP2992IM5-1.5 LFBB 1000 Units on Tape and Reel

1.8 A LP2992AIM5X-1.8 LFCA 3000 Units on Tape and Reel

1.8 A LP2992AIM5-1.8 LFCA 1000 Units on Tape and Reel

1.8 STD LP2992IM5X-1.8 LFCB 3000 Units on Tape and Reel

1.8 STD LP2992IM5-1.8 LFCB 1000 Units on Tape and Reel

2.5 A LP2992AIM5X-2.5 LFDA 3000 Units on Tape and Reel

2.5 A LP2992AIM5-2.5 LFDA 1000 Units on Tape and Reel

2.5 STD LP2992IM5X-2.5 LFDB 3000 Units on Tape and Reel

2.5 STD LP2992IM5-2.5 LFDB 1000 Units on Tape and Reel

3.0 A LP2992AIM5X-3.0 LF8A 3000 Units on Tape and Reel

3.0 A LP2992AIM5-3.0 LF8A 1000 Units on Tape and Reel

3.0 STD LP2992IM5X-3.0 LF8B 3000 Units on Tape and Reel

3.0 STD LP2992IM5-3.0 LF8B 1000 Units on Tape and Reel

3.3 A LP2992AIM5X-3.3 LFEA 3000 Units on Tape and Reel

3.3 A LP2992AIM5-3.3 LFEA 1000 Units on Tape and Reel

3.3 STD LP2992IM5X-3.3 LFEB 3000 Units on Tape and Reel

3.3 STD LP2992IM5-3.3 LFEB 1000 Units on Tape and Reel

5.0 A LP2992AIM5X-5.0 LFFA 3000 Units on Tape and Reel

5.0 A LP2992AIM5-5.0 LFFA 1000 Units on Tape and Reel

5.0 STD LP2992IM5X-5.0 LFFB 3000 Units on Tape and Reel

5.0 STD LP2992IM5-5.0 LFFB 1000 Units on Tape and Reel

6-Lead LLP Package (LDE06A)

1.5 A LP2992AILDX-1.5 L011A 4500 Units on Tape and Reel

1.5 A LP2992AILD-1.5 L011A 1000 Units on Tape and Reel

1.5 STD LP2992ILDX-1.5 L011AB 4500 Units on Tape and Reel

1.5 STD LP2992ILD-1.5 L011AB 1000 Units on Tape and Reel

1.8 A LP2992AILDX-1.8 L012A 4500 Units on Tape and Reel

1.8 A LP2992AILD-1.8 L012A 1000 Units on Tape and Reel

1.8 STD LP2992ILDX-1.8 L012AB 4500 Units on Tape and Reel

1.8 STD LP2992ILD-1.8 L012AB 1000 Units on Tape and Reel

2.5 A LP2992AILDX-2.5 L013A 4500 Units on Tape and Reel

2.5 A LP2992AILD-2.5 L013A 1000 Units on Tape and Reel

2.5 STD LP2992ILDX-2.5 L013AB 4500 Units on Tape and Reel

2.5 STD LP2992ILD-2.5 L013AB 1000 Units on Tape and Reel

3.3 A LP2992AILDX-3.3 L014A 4500 Units on Tape and Reel

3.3 A LP2992AILD-3.3 L014A 1000 Units on Tape and Reel

3.3 STD LP2992ILDX-3.3 L014AB 4500 Units on Tape and Reel

3.3 STD LP2992ILD-3.3 L014AB 1000 Units on Tape and Reel

5.0 A LP2992AILDX-5.0 L015A 4500 Units on Tape and Reel

5.0 A LP2992AILD-5.0 L015A 1000 Units on Tape and Reel

5.0 STD LP2992ILDX-5.0 L015AB 4500 Units on Tape and Reel

5.0 STD LP2992ILD-5.0 L015AB 1000 Units on Tape and Reel

Grade Order Information

Package

Marking

LP2992

Supplied as:

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

LP2992

please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Storage Temperature Range −65˚C to +150˚C

Input Supply Voltage (Survival) −0.3V to +16V

Input Supply Voltage (Operating) 2.2V to +16V

Shutdown Input Voltage (Survival) −0.3V to +16V

Output Voltage (Survival, (Note 4)) −0.3V to +9V

(Survival) Short Circuit

OUT

Operating Junction Temperature Range −40˚C to +125˚C

Lead Temp. (Soldering, 5 sec.) 260˚C

Input-Output Voltage (Survival, −0.3V to +16V

(Note 5))

ESD Rating (Note 2) 2 kV

Power Dissipation (Note 3) Internally Limited

Electrical Characteristics

Limits in standard typeface are for TJ= 25˚C. and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: V

(NOM) + 1V, IL= 1 mA, CIN= 1 µF, C

IN=VO

Symbol Parameter Conditions Typ

∆V

Output Voltage Tolerance

IL= 1 mA −1.0 1.0 −1.5 1.5

1mA≤ IL≤ 50 mA −1.5 1.5 −2.5 2.5

1mA≤ I

≤ 250 mA −3.5 3.5 −4.0 4.0

Output Voltage VO(NOM)+1V ≤ VIN≤ 16V 0.007 0.014 0.014

Line Regulation 0.032 0.032

(min) Minimum input voltage

required to maintain outpout regulation

IN–VO

Dropout Voltage

IL= 0 0.5 2.5 2.5

(Note 7)

=1mA 5 9 9

= 50 mA 100 125 125

= 150 mA 260 325 325

= 250 mA 450 575 575

GND

ON/OFF

Ground Pin Current IL= 0 65 95 95

= 1 mA 75 110 110

= 50 mA 350 600 600

= 150 mA 850 1500 1500

= 250 mA 1500 2300 2300

ON/OFF

0.3V 0.01 0.8 0.8

0.15V 0.05 2 2

ON/OFF Input Voltage (Note 8)

High = O/P ON 1.4 1.6 1.6

Low = O/P OFF 0.55 0.15 0.15

= 4.7 µF, V

OUT

ON/OFF

= 2V.

LP2992AI-X.X LP2992I-X.X

Min Max Min Max

−2.5 2.5 −3.5 3.5

−4.5 4.5 −5.0 5.0

2.05 2.20 2.20 V

12 12

180 180

470 470

850 850

125 125

170 170

1000 1000

2500 2500

4000 4000

Protected

Units(Note 6) (Note 6)

NOM

%/V

µA

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Electrical Characteristics (Continued)

Limits in standard typeface are for TJ= 25˚C. and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: V

(NOM) + 1V, IL= 1 mA, CIN= 1 µF, C

IN=VO

Symbol Parameter Conditions Typ

ON/OFF

(SC) Short Circuit Current RL= 0 (Steady State)

ON/OFF Input Current V

= 0 0.01 −2 −2

ON/OFF

=5V 5 15 15

ON/OFF

Output Noise BW = 300 Hz to 50 kHz,

Voltage (RMS) C

Ripple Rejection f = 1 kHz, C

=10µF 30 µV

OUT

BYPASS

OUT

=10nF

BYPASS

=10µF

=10nF

(Note 9)

(PK) Peak Output Current V

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, T

and the ambient temperature, T

. The maximum allowable power dissipation at any ambient temperture is calculated using:

≥ Vo(NOM) −5% 350 mA

OUT

= 4.7 µF, V

OUT

ON/OFF

= 2V.

LP2992AI-X.X LP2992I-X.X

Min Max Min Max

45 dB

400 mA

(MAX), the junction-to-ambient thermal resistance, θ

LP2992

Units(Note 6) (Note 6)

µA

J-A

Where the value of θ 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 V

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: V 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 V

forced to ground (see Typical Performance Characteristics curves).

must be the greater of 2.2V or V

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

J-A

to V

+ Dropout Voltage to maintain output regulation. Dropout voltage is defined as the input to output differential

OUT(nom)

terminals that is normally reverse-biased. Reversing the polarity from VINto V

OUT

0.5V, and then reduces the maximum output current as V

OUT

will

OUT

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