National Semiconductor LP2989 Technical data

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

February 2005

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 can be 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

100 µA load.

mV 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.

For output voltages

100 µA load.

(Vertically Integrated PNP) pro-

500 mA load, and 1

500 mA load, and

2V, see LP2989LV datasheet.

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, Mini SO-8, 8 Lead LLP surface mount packages

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

10133901

VIP™is a trademark of National Semiconductor Corporation.

Connection Diagrams

LP2989

Surface Mount Packages: 8 Lead LLP Surface Mount Package

SO-8/Mini SO-8 Package

10133902

See NS Package Drawing Numbers M08A/MUA08A

Basic Application Circuit

Top View

10133950

See NS Package Number LDC08A

*Capacitance values shown are minimum required to assure stability, but may be increased without limit. Larger output capacitor provides improved dynamic response. See Application Hints. **Shutdown must be actively terminated (see App. Hints). Tie to INPUT (Pin4) if not used

10133903

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Ordering Information

TABLE 1. Package Marking and Ordering Information

Output Voltage Grade Order Information Package Marking Supplied as:

8 Lead LLP

2.5 A LP2989AILD-2.5 L01FA 1000 Units on Tape and Reel

2.5 A LP2989AILDX-2.5 L01FA 4500 Units on Tape and Reel

2.5 STD LP2989ILD-2.5 L01FAB 1000 Units on Tape and Reel

2.5 STD LP2989ILDX-2.5 L01FAB 4500 Units on Tape and Reel

2.8 A LP2989AILD-2.8 L000A 1000 Units on Tape and Reel

2.8 A LP2989AILDX-2.8 L000A 4500 Units on Tape and Reel

2.8 STD LP2989ILD-2.8 L000AB 1000 Units on Tape and Reel

2.8 STD LP2989ILDX-2.8 L000AB 4500 Units on Tape and Reel

2.85 A LP2989AILD-285 L01TA 1000 Units on Tape and Reel

2.85 A LP2989AILDX-285 L01TA 4500 Units on Tape and Reel

2.85 STD LP2989ILD-285 L01TAB 1000 Units on Tape and Reel

2.85 STD LP2989ILDX-285 L01TAB 4500 Units on Tape and Reel

3.0 A LP2989AILD-3.0 L01HA 1000 Units on Tape and Reel

3.0 A LP2989AILDX-3.0 L01HA 4500 Units on Tape and Reel

3.0 STD LP2989ILD-3.0 L01HAB 1000 Units on Tape and Reel

3.0 STD LP2989ILDX-3.0 L01HAB 4500 Units on Tape and Reel

3.3 A LP2989AILD-3.3 L01JA 1000 Units on Tape and Reel

3.3 A LP2989AILDX-3.3 L01JA 4500 Units on Tape and Reel

3.3 STD LP2989ILD-3.3 L01JAB 1000 Units on Tape and Reel

3.3 STD LP2989ILDX-3.3 L01JAB 4500 Units on Tape and Reel

3.6 A LP2989AILD-3.6 L019A 1000 Units on Tape and Reel

3.6 A LP2989AILDX-3.6 L019A 4500 Units on Tape and Reel

3.6 STD LP2989ILD-3.6 L019AB 1000 Units on Tape and Reel

3.6 STD LP2989ILDX-3.6 L019AB 4500 Units on Tape and Reel

4.0 A LP2989AILD-4.0 L01LA 1000 Units on Tape and Reel

4.0 A LP2989AILDX-4.0 L01LA 4500 Units on Tape and Reel

4.0 STD LP2989ILD-4.0 L01LAB 1000 Units on Tape and Reel

4.0 STD LP2989ILDX-4.0 L01LAB 4500 Units on Tape and Reel

5.0 A LP2989AILD-5.0 L01KA 1000 Units on Tape and Reel

5.0 A LP2989AILDX-5.0 L01KA 4500 Units on Tape and Reel

5.0 STD LP2989ILD-5.0 L01KAB 1000 Units on Tape and Reel

5.0 STD LP2989ILDX-5.0 L01KAB 4500 Units on Tape and Reel

8 Lead MSOP (MM)

2.5 A LP2989AIMM-2.5 LA0A 1000 Units on Tape and Reel

2.5 A LP2989AIMMX-2.5 LA0A 3500 Units on Tape and Reel

2.5 STD LP2989IMM-2.5 LA0B 1000 Units on Tape and Reel

2.5 STD LP2989IMMX-2.5 LA0B 3500 Units on Tape and Reel

2.8 A LP2989AIMM-2.8 LA6A 1000 Units on Tape and Reel

2.8 A LP2989AIMMX-2.8 LA6A 3500 Units on Tape and Reel

2.8 STD LP2989IMM-2.8 LA6B 1000 Units on Tape and Reel

2.8 STD LP2989IMMX-2.8 LA6B 3500 Units on Tape and Reel

3.0 A LP2989AIMM-3.0 LA1A 1000 Units on Tape and Reel

3.0 A LP2989AIMMX-3.0 LA1A 3500 Units on Tape and Reel

3.0 STD LP2989IMM-3.0 LA1B 1000 Units on Tape and Reel

3.0 STD LP2989IMMX-3.0 LA1B 3500 Units on Tape and Reel

3.3 A LP2989AIMM-3.3 LA2A 1000 Units on Tape and Reel

3.3 A LP2989AIMMX-3.3 LA2A 3500 Units on Tape and Reel

LP2989

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Ordering Information (Continued)

LP2989

Output Voltage Grade Order Information Package Marking Supplied as:

3.3 STD LP2989IMM-3.3 LA2B 1000 Units on Tape and Reel

3.3 STD LP2989IMMX-3.3 LA2B 3500 Units on Tape and Reel

5.0 A LP2989AIMM-5.0 LA4A 1000 Units on Tape and Reel

5.0 A LP2989AIMMX-5.0 LA4A 3500 Units on Tape and Reel

5.0 STD LP2989IMM-5.0 LA4B 1000 Units on Tape and Reel

5.0 STD LP2989IMMX-5.0 LA4B 3500 Units on Tape and Reel

SO-8 (M)

2.5 A LP2989AIMX-2.5 LP2989AIM2.5 2500 Units on Tape and Reel

2.5 A LP2989AIM-2.5 LP2989AIM2.5 Shipped in Anti-Static Rails

2.5 STD LP2989IMX-2.5 LP2989IM2.5 2500 Units on Tape and Reel

2.5 STD LP2989IM-2.5 LP2989IM2.5 Shipped in Anti-Static Rails

3.0 A LP2989AIMX-3.0 LP2989AIM3.0 2500 Units on Tape and Reel

3.0 A LP2989AIM-3.0 LP2989AIM3.0 Shipped in Anti-Static Rails

3.0 STD LP2989IMX-3.0 LP2989IM3.0 2500 Units on Tape and Reel

3.0 STD LP2989IM-3.0 LP2989IM3.0 Shipped in Anti-Static Rails

3.3 A LP2989AIMX-3.3 LP2989AIM3.3 2500 Units on Tape and Reel

3.3 A LP2989AIM-3.3 LP2989AIM3.3 Shipped in Anti-Static Rails

3.3 STD LP2989IMX-3.3 LP2989IM3.3 2500 Units on Tape and Reel

3.3 STD LP2989IM-3.3 LP2989IM3.3 Shipped in Anti-Static Rails

5.0 A LP2989AIMX-5.0 LP2989AIM5.0 2500 Units on Tape and Reel

5.0 A LP2989AIM-5.0 LP2989AIM5.0 Shipped in Anti-Static Rails

5.0 STD LP2989IMX-5.0 LP2989IM5.0 2500 Units on Tape and Reel

5.0 STD LP2989IM-5.0 LP2989IM5.0 Shipped in Anti-Static Rails

For output voltages<2V, see LP2989LV datasheet.

TABLE 1. Package Marking and Ordering Information (Continued)

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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

Power Dissipation (Note 3) Internally Limited

Electrical Characteristics

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

(Survival) Short Circuit

OUT

Protected

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

Electrical Characteristics (Continued)

Limits in standard typeface are for TJ= 25˚C, and limits in boldface type apply over the full operating temperature range. Un-

LP2989

less otherwise specified: V

Symbol Parameter Conditions Typical

Ripple Rejection f = 1 kHz, C

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

IN=VO

OUT

=10µF

= 4.7 µF, CIN= 2.2 µF, V

LP2989AI-X.X

(Note 6)

S/D

= 2V.

LP2989I-X.X

(Note 6)

Min Max Min Max

60 dB

Units

Output Voltage Temperature Coefficient

(Note 8)

20 ppm/˚C

SHUTDOWN INPUT

S/D

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

0.18 0.18

S/D Input Current V

= O/P OFF

≤ 2µA

= 0 0.001 −1 −1

S/D

=5V 5 15 15

S/D

0.50

ERROR COMPARATOR

THR

(MAX)

THR

(MIN)

Output “HIGH” Leakage VOH= 16V

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

(COMP) = 150 µA

Upper Threshold Voltage

Lower Threshold Voltage

0.001

150

−4.8

−6.6

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

HYST Hysteresis 2.0

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: 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:

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

µA

OUT

J−A

The value of θ dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187. Exceeding the maximum allowable power 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 LP2989 output must be diode-clamped to ground.

Note 5: The output 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.

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for the SO-8 (M) package is 160˚C/W and the mini SO-8 (MM) package is 200˚C/W. The value θ

J−A

and V

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

OUT

for the LLP (LD) package is specifically

J−A

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