NSC LP2989IMX-2.5, LP2989IM-2.5, LP2989AIMX-2.5, LP2989AIM-2.5 Datasheet

LP2989
Micropower/Low Noise, 500 mA Ultra Low-Dropout
Regulator
For Use with Ceramic Output Capacitors

March 2000

LP2989 Micropower/Low Noise, 500 mA Ultra Low-Dropout Regulator

For Use with Ceramic Output Capacitors

General Description

The LP2989 is a fixed-output 500 mA precision LDO regula­tor designed for use with ceramic output capacitors.

Output noise canbe reduced to 18µV (typical) by connecting
an external 10 nF capacitor to the bypass pin.

Using an optimized VIP
cess, the LP2989 delivers superior performance:

Dropout Voltage: Typically 310 mV

@

mV

100 µA load.

Ground Pin Current: Typically 3 mA

@

110 µA
Sleep Mode: The LP2989 draws less than 0.8 µA quiescent

current when shutdown pin is pulled low.
Error Flag: The built-in error flag goes low when the output

drops approximately 5% below nominal.
Precision Output: Guaranteed output voltage accuracy is

0.75% (“A” grade) and 1.25% (standard grade) at room tem­perature.

100 µA load.

™

(Vertically Integrated PNP) pro-

@

500 mA load, and 1

@

500 mA load, and

Block Diagram

Features

n Ultra low dropout voltage
n Guaranteed 500 mA continuous output current
n Very low output noise with external capacitor
n SO-8 surface mount package

<

n

0.8 µA quiescent current when shutdown

n Low ground pin current at all loads
n 0.75% output voltage accuracy (“A” grade)
n High peak current capability (800 mA typical)
n Wide supply voltage range (16V max)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range

Applications

n Notebook/Desktop PC
n PDA/Palmtop Computer
n Wireless Communication Terminals
n SMPS Post-Regulator

DS101339-1

VIP™is a trademark of National Semiconductor Corporation.

© 2000 National Semiconductor Corporation DS101339 www.national.com

Connection Diagram

LP2989

SO-8 Package Type M: See NS Package Drawing Number M08A

Surface Mount Packages:

DS101339-2

Ordering Information

TABLE 1. Package Marking and Ordering Information for SO-8 (M) Devices

Output Voltage Grade Order Information Package Marking Supplied as:

2.5 A LP2989AIMX-2.5 2989AIM2.5 2500 Units on Tape and Reel

2.5 A LP2989AIM-2.5 2989AIM2.5 Shipped in Anti-Static Rails

2.5 STD LP2989IMX-2.5 2989IM2.5 2500 Units on Tape and Reel

2.5 STD LP2989IM-2.5 2989IM2.5 Shipped in Anti-Static Rails

Basic Application Circuit

DS101339-3

*

Capacitance values shown are minimum required to assure stability, but may be increased without limit. Larger output capacitor provides improved dynamic re-

sponse.

**

Shutdown must be actively terminated (see App. Hints). Tie to INPUT (Pin4) if not used.

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LP2989

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

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

Junction Temperature Range −40˚C to +125˚C
Lead Temperature (Soldering,

5 seconds) 260˚C
ESD Rating (Note 2) 2 kV

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

(Operating) 2.1V to +16V
Sense Pin −0.3V to +6V
Output Voltage (Survival)

(Note 4) −0.3V to +16V
I

(Survival) Short Circuit

OUT

Protected

Input-Output Voltage (Survival)
(Note 5) −0.3V to +16V

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

Symbol Parameter Conditions Typical

V

O

Output Voltage
Tolerance

Output Voltage Line
Regulation

Load Regulation 1 mA<I

(NOM) + 1V, IL= 1 mA, C

IN=VO

1mA<I
V

O

16V
1mA

V

O

16V

−25˚C ≤ T

VO(NOM) + 1V ≤ VIN≤
16V

OUT

<

500 mA

L

(NOM) + 1V ≤ VIN≤

<

<

I

500 mA

L

(NOM) + 1V ≤ VIN≤

≤ 125˚C

J

<

500 mA 0.4 %V

L

= 4.7 µF, CIN= 1 µF, V

LP2989AI-X.X

(Note 6)

Min Max Min Max

−0.75 0.75 −1.25 1.25

−1.5 1.5 −2.5 2.5

−4.0 2.5 −5.0 3.5

−3.5 2.5 −4.5 3.5

0.005

= 2V.

S/D

LP2989I-X.X

(Note 6)

0.014 0.014

0.032 0.032

%V

Units

NOM

%/V

NOM

VIN–V

O

Dropout Voltage

IL= 100 µA

(Note 7)

I

= 200 mA

L

I

= 500 mA

L

I

GND

I

(PK) Peak Output Current V

O

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

I

O

Ground Pin Current IL= 100 µA

I

= 200 mA

L

I

= 500 mA

L

<

V

0.18V 0.5 2 2

S/D

<

0.4V 0.05 0.8 0.8

V

S/D

≥ VO(NOM) − 5% 800 600 600

OUT

(Note 9)

e

n

Output Noise Voltage
(RMS)

BW = 100 Hz to
100 kHz, C
C

BYPASS

OUT

= .01 µF V

= 2.5V

Ripple Rejection f = 1 kHz, C

OUT

=10µF

OUT

=10µF

1

150

310

110

1

3

33

44

200 200

300 300

mV

425 425

650 650

175 175

200 200

µA

22

3.5 3.5

66

mA

99

µA

1000

mA

18 µV(RMS)

60 dB

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Electrical Characteristics (Continued)

LP2989

Limits in standard typeface are for TJ= 25˚C, and limits in boldface type apply over the full operating temperature range. Un­less otherwise specified: VIN=VO(NOM) + 1V, IL= 1 mA, C

Symbol Parameter Conditions Typical

Output Voltage

(Note 8)

Temperature Coefficient

SHUTDOWN INPUT

V

S/D

I

S/D

S/D Input Voltage VH= O/P ON 1.4 1.6 1.6

= O/P OFF

V

L

≤ 2µA

I

IN

S/D Input Current V

= 0 0.001 −1 −1

S/D

=5V 5 15 15

V

S/D

ERROR COMPARATOR

I

OH

V

OL

V

THR

(MAX)
V

THR

(MIN)

Output “HIGH” Leakage VOH= 16V

Output “LOW” Voltage VIN=VO(NOM) − 0.5V,

(COMP) = 150 µA

I

O

Upper Threshold
Voltage

Lower Threshold
Voltage

HYST Hysteresis 2.0

Note 1: AbsoluteMaximum 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: ESD testing was performed using Human Body Model, a 100 pF capacitor discharged through a 1.5 kΩ resistor.
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 temperature is calculated using:

A

= 4.7 µF, CIN= 1 µF, V

OUT

20 ppm/˚C

0.50

0.001

150

−4.8

−6.6

= 2V.

S/D

LP2989AI-X.X

(Note 6)

LP2989I-X.X

(Note 6)

Min Max Min Max

0.18 0.18

11

22

220 220

350 350

−6.0 −3.5 −6.0 −3.5

−8.3 −2.5 −8.3 −2.5

−8.9 −4.9 −8.9 −4.9

−13.0 −3.0 −13.0 −3.0

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

J

Units

µA

µA

mV

%V

V

OUT

J−A

,

The value of θ
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 LP2989 output must be diode-clamped to ground.
Note 5: Theoutput PNP structure contains a diode between the V

on this diode and may induce a latch-up mode which can damage the part (see Application Hints).
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: 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.
Note 8: Temperature coefficient is defined as the maximum (worst-case) change divided by the total temperature range.
Note 9: See Typical Performance Characteristics curves.

for the SO-8 (M) package is 160˚C. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator

J−A

IN

and V

terminals that is normally reverse-biased. Forcing the output above the input will turn

OUT

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