National Semiconductor LP2985 Technical data

June 2005

LP2985
Micropower 150 mA Low-Noise Ultra Low-Dropout
Regulator in SOT-23 and micro SMD Packages

Designed for Use with Very Low ESR Output Capacitors

LP2985 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMD

Packages

General Description

The LP2985 is a 150 mA, fixed-output voltage regulator
designed to provide ultra low-dropout and low noise in bat­tery powered applications.

™

Using an optimized VIP
cess, the LP2985 delivers unequalled performance in all
specifications critical to battery-powered designs:

Dropout Voltage: Typically 300 mV

@

7mV
Ground Pin Current: Typically 850 µA

75 µA
Enhanced Stability: The LP2985 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 micro SMD 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 2.5V to 5.0V, are available as
standard products. Consult factory for custom voltages.

1 mA load.

@

1 mA load.

(Vertically Integrated PNP) pro-

@

150 mA load, and

@

150 mA load, and

Features

n Ultra low dropout voltage
n Guaranteed 150 mA output current
n Smallest possible size (SOT-23, micro SMD package)
n Requires minimum external components
n Stable with low-ESR output capacitor

<

n

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

10014001

VIP™is a trademark of National Semiconductor Corporation.

© 2005 National Semiconductor Corporation DS100140 www.national.com

Basic Application Circuit

LP2985

*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).

10014002

Connection Diagrams

5-Lead Small Outline Package (M5) micro SMD, 5 Bump Package (BPA05, TPA05 & BLA05)

Top View

10014003

See NS Package Number MF05A

For ordering information see Table 1

Note: The actual physical placement of the package marking will vary from

part to part. Package marking contains date code and lot traceability
information, and will vary considerably. Package marking does not correlate
to device type.

10014046

Top View

See NS Package Number BPA05, TPA05 & BLA05

Pin Descrption

Name Pin Number Function

SOT-23 micro SMD

V

IN

1 C3 Input Voltage

GND 2 A1 Common Ground (device substrate)

ON/OFF 3 A3 Logic high enable input

BYPASS 4 B2 Bypass capacitor for low noise operation

V

OUT

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5 C1 Regulated output voltage

Ordering Information

TABLE 1. Package Marking and Ordering Information

Output Voltage (V) Grade Order Information

5-Lead Small Outline Package (M5)

For output voltages ≤ 2.3V, refer to LP2985LV datasheet.

2.5 A LP2985AIM5X-2.5 LAUA 3000 Units on Tape and Reel

2.5 A LP2985AIM5-2.5 LAUA 1000 Units on Tape and Reel

2.5 STD LP2985IM5X-2.5 LAUB 3000 Units on Tape and Reel

2.5 STD LP2985IM5-2.5 LAUB 1000 Units on Tape and Reel

2.6 A LP2985AIM5X-2.6 LCEA 3000 Units on Tape and Reel

2.6 A LP2985AIM5-2.6 LCEA 1000 Units on Tape and Reel

2.6 STD LP2985IM5X-2.6 LCEB 3000 Units on Tape and Reel

2.6 STD LP2985IM5-2.6 LCEB 1000 Units on Tape and Reel

2.7 A LP2985AIM5X-2.7 LALA 3000 Units on Tape and Reel

2.7 A LP2985AIM5-2.7 LALA 1000 Units on Tape and Reel

2.7 STD LP2985IM5X-2.7 LALB 3000 Units on Tape and Reel

2.7 STD LP2985IM5-2.7 LALB 1000 Units on Tape and Reel

2.8 A LP2985AIM5X-2.8 L0KA 3000 Units on Tape and Reel

2.8 A LP2985AIM5-2.8 L0KA 1000 Units on Tape and Reel

2.8 STD LP2985IM5X-2.8 L0KB 3000 Units on Tape and Reel

2.8 STD LP2985IM5-2.8 L0KB 1000 Units on Tape and Reel

2.9 A LP2985AIM5X-2.9 LAXA 3000 Units on Tape and Reel

2.9 A LP2985AIM5-2.9 LAXA 1000 Units on Tape and Reel

2.9 STD LP2985IM5X-2.9 LAXB 3000 Units on Tape and Reel

2.9 STD LP2985IM5-2.9 LAXB 1000 Units on Tape and Reel

3.0 A LP2985AIM5X-3.0 L0OA 3000 Units on Tape and Reel

3.0 A LP2985AIM5-3.0 L0OA 1000 Units on Tape and Reel

3.0 STD LP2985IM5X-3.0 L0OB 3000 Units on Tape and Reel

3.0 STD LP2985IM5-3.0 L0OB 1000 Units on Tape and Reel

3.1 A LP2985AIM5X-3.1 L0PA 3000 Units on Tape and Reel

3.1 A LP2985AIM5-3.1 L0PA 1000 Units on Tape and Reel

3.1 STD LP2985IM5X-3.1 L0PB 3000 Units on Tape and Reel

3.1 STD LP2985IM5-3.1 L0PB 1000 Units on Tape and Reel

3.2 A LP2985AIM5X-3.2 L0QA 3000 Units on Tape and Reel

3.2 A LP2985AIM5-3.2 L0QA 1000 Units on Tape and Reel

3.2 STD LP2985IM5X-3.2 L0QB 3000 Units on Tape and Reel

3.2 STD LP2985IM5-3.2 L0QB 1000 Units on Tape and Reel

3.3 A LP2985AIM5X-3.3 L0RA 3000 Units on Tape and Reel

3.3 A LP2985AIM5-3.3 L0RA 1000 Units on Tape and Reel

3.3 STD LP2985IM5X-3.3 L0RB 3000 Units on Tape and Reel

3.3 STD LP2985IM5-3.3 L0RB 1000 Units on Tape and Reel

3.5 A LP2985AIM5X-3.5 LAIA 3000 Units on Tape and Reel

3.5 A LP2985AIM5-3.5 LAIA 1000 Units on Tape and Reel

3.5 STD LP2985IM5X-3.5 LAIB 3000 Units on Tape and Reel

3.5 STD LP2985IM5-3.5 LAIB 1000 Units on Tape and Reel

3.6 A LP2985AIM5X-3.6 L0SA 3000 Units on Tape and Reel

3.6 A LP2985AIM5-3.6 L0SA 1000 Units on Tape and Reel

3.6 STD LP2985IM5X-3.6 L0SB 3000 Units on Tape and Reel

3.6 STD LP2985IM5-3.6 L0SB 1000 Units on Tape and Reel

3.8 A LP2985AIM5X-3.8 L0YA 3000 Units on Tape and Reel

Package

Marking

LP2985

Supplied as:

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Ordering Information (Continued)

LP2985

Output Voltage (V) Grade Order Information

3.8 A LP2985AIM5-3.8 L0YA 1000 Units on Tape and Reel

3.8 STD LP2985IM5X-3.8 L0YB 3000 Units on Tape and Reel

3.8 STD LP2985IM5-3.8 L0YB 1000 Units on Tape and Reel

4.0 A LP2985AIM5X-4.0 L0TA 3000 Units on Tape and Reel

4.0 A LP2985AIM5-4.0 L0TA 1000 Units on Tape and Reel

4.0 STD LP2985IM5X-4.0 L0TB 3000 Units on Tape and Reel

4.0 STD LP2985IM5-4.0 L0TB 1000 Units on Tape and Reel

4.5 A LP2985AIM5X-4.5 LA7A 3000 Units on Tape and Reel

4.5 A LP2985AIM5-4.5 LA7A 1000 Units on Tape and Reel

4.5 STD LP2985IM5X-4.5 LA7B 3000 Units on Tape and Reel

4.5 STD LP2985IM5-4.5 LA7B 1000 Units on Tape and Reel

4.7 A LP2985AIM5X-4.7 LAJA 3000 Units on Tape and Reel

4.7 A LP2985AIM5-4.7 LAJA 1000 Units on Tape and Reel

4.7 STD LP2985IM5X-4.7 LAJB 3000 Units on Tape and Reel

4.7 STD LP2985IM5-4.7 LAJB 1000 Units on Tape and Reel

4.8 A LP2985AIM5X-4.8 LAKA 3000 Units on Tape and Reel

4.8 A LP2985AIM5-4.8 LAKA 1000 Units on Tape and Reel

4.8 STD LP2985IM5X-4.8 LAKB 3000 Units on Tape and Reel

4.8 STD LP2985IM5-4.8 LAKB 1000 Units on Tape and Reel

5.0 A LP2985AIM5X-5.0 L0UA 3000 Units on Tape and Reel

5.0 A LP2985AIM5-5.0 L0UA 1000 Units on Tape and Reel

5.0 STD LP2985IM5X-5.0 L0UB 3000 Units on Tape and Reel

5.0 STD LP2985IM5-5.0 L0UB 1000 Units on Tape and Reel

5.3 A LP2985AIM5X-5.3 LFYA 3000 Units on Tape and Reel

5.3 A LP2985AIM5-5.3 LFYA 1000 Units on Tape and Reel

5.3 STD LP2985IM5X-5.3 LFYB 3000 Units on Tape and Reel

5.3 STD LP2985IM5-5.3 LFYB 1000 Units on Tape and Reel

6.1 A LP2985AIM5X-6.1 LF6A 3000 Units on Tape and Reel

6.1 A LP2985AIM5-6.1 LF6A 1000 Units on Tape and Reel

6.1 STD LP2985IM5X-6.1 LF6B 3000 Units on Tape and Reel

6.1 STD LP2985IM5-6.1 LF6B 1000 Units on Tape and Reel

12

(Note 11)

12

(Note 11)

12

(Note 11)

12

(Note 11)

micro SMD, 5 Bump Package (BPA05 - 170 µm ball)

2.4 A LP2985AIBP-2.4 250 Units on Tape and Reel

2.4 A LP2985AIBPX-2.4 3000 Units on Tape and Reel

2.4 STD LP2985IBP-2.4 250 Units on Tape and Reel

2.4 STD LP2985IBPX-2.4 3000 Units on Tape and Reel

2.5 A LP2985AIBP-2.5 250 Units on Tape and Reel

2.5 A LP2985AIBPX-2.5 3000 Units on Tape and Reel

2.5 STD LP2985IBP-2.5 250 Units on Tape and Reel

2.5 STD LP2985IBPX-2.5 3000 Units on Tape and Reel

TABLE 1. Package Marking and Ordering Information (Continued)

A LP2985AIM5X-12 LH1A 3000 Units on Tape and Reel

A LP2985AIM5-12 LH1A 1000 Units on Tape and Reel

STD LP2985IM5X-12 LH1B 3000 Units on Tape and Reel

STD LP2985IM5-12 LH1B 1000 Units on Tape and Reel

Package

Marking

Supplied as:

www.national.com 4

Ordering Information (Continued)

TABLE 1. Package Marking and Ordering Information (Continued)

Output Voltage (V) Grade Order Information

2.6 A LP2985AIBP-2.6 250 Units on Tape and Reel

2.6 A LP2985AIBPX-2.6 3000 Units on Tape and Reel

2.6 STD LP2985IBP-2.6 250 Units on Tape and Reel

2.6 STD LP2985IBPX-2.6 3000 Units on Tape and Reel

2.8 A LP2985AIBP-2.8 250 Units on Tape and Reel

2.8 A LP2985AIBPX-2.8 3000 Units on Tape and Reel

2.8 STD LP2985IBP-2.8 250 Units on Tape and Reel

2.8 STD LP2985IBPX-2.8 3000 Units on Tape and Reel

2.9 A LP2985AIBP-2.9 250 Units on Tape and Reel

2.9 A LP2985AIBPX-2.9 3000 Units on Tape and Reel

2.9 STD LP2985IBP-2.9 250 Units on Tape and Reel

2.9 STD LP2985IBPX-2.9 3000 Units on Tape and Reel

3.0 A LP2985AIBP-3.0 250 Units on Tape and Reel

3.0 A LP2985AIBPX-3.0 3000 Units on Tape and Reel

3.0 STD LP2985IBP-3.0 250 Units on Tape and Reel

3.0 STD LP2985IBPX-3.0 3000 Units on Tape and Reel

3.3 A LP2985AIBP-3.3 250 Units on Tape and Reel

3.3 A LP2985AIBPX-3.3 3000 Units on Tape and Reel

3.3 STD LP2985IBP-3.3 250 Units on Tape and Reel

3.3 STD LP2985IBPX-3.3 3000 Units on Tape and Reel

3.6 A LP2985AIBP-3.6 250 Units on Tape and Reel

3.6 A LP2985AIBPX-3.6 3000 Units on Tape and Reel

3.6 STD LP2985IBP-3.6 250 Units on Tape and Reel

3.6 STD LP2985IBPX-3.6 3000 Units on Tape and Reel

4.0 A LP2985AIBP-4.0 250 Units on Tape and Reel

4.0 A LP2985AIBPX-4.0 3000 Units on Tape and Reel

4.0 STD LP2985IBP-4.0 250 Units on Tape and Reel

4.0 STD LP2985IBPX-4.0 3000 Units on Tape and Reel

5.0 A LP2985AIBP-5.0 250 Units on Tape and Reel

5.0 A LP2985AIBPX-5.0 3000 Units on Tape and Reel

5.0 STD LP2985IBP-5.0 250 Units on Tape and Reel

5.0 STD LP2985IBPX-5.0 3000 Units on Tape and Reel

micro SMD, 5 Bump Package (TPA05 - 170 µm ball)

2.5 A LP2985AITP-2.5 250 Units on Tape and Reel

2.5 A LP2985AITPX-2.5 3000 Units on Tape and Reel

2.5 STD LP2985ITP-2.5 250 Units on Tape and Reel

2.5 STD LP2985ITPX-2.5 3000 Units on Tape and Reel

2.6 A LP2985AITP-2.6 250 Units on Tape and Reel

2.6 A LP2985AITPX-2.6 3000 Units on Tape and Reel

2.6 STD LP2985ITP-2.6 250 Units on Tape and Reel

2.6 STD LP2985ITPX-2.6 3000 Units on Tape and Reel

2.7 A LP2985AITP-2.7 250 Units on Tape and Reel

2.7 A LP2985AITPX-2.7 3000 Units on Tape and Reel

2.7 STD LP2985ITP-2.7 250 Units on Tape and Reel

2.7 STD LP2985ITPX-2.7 3000 Units on Tape and Reel

2.8 A LP2985AITP-2.8 250 Units on Tape and Reel

2.8 A LP2985AITPX-2.8 3000 Units on Tape and Reel

Package

Marking

LP2985

Supplied as:

www.national.com5

Ordering Information (Continued)

LP2985

Output Voltage (V) Grade Order Information

2.8 STD LP2985ITP-2.8 250 Units on Tape and Reel

2.8 STD LP2985ITPX-2.8 3000 Units on Tape and Reel

2.9 A LP2985AITP-2.9 250 Units on Tape and Reel

2.9 A LP2985AITPX-2.9 3000 Units on Tape and Reel

2.9 STD LP2985ITP-2.9 250 Units on Tape and Reel

2.9 STD LP2985ITPX-2.9 3000 Units on Tape and Reel

3.3 A LP2985AITP-3.3 250 Units on Tape and Reel

3.3 A LP2985AITPX-3.3 3000 Units on Tape and Reel

3.3 STD LP2985ITP-3.3 250 Units on Tape and Reel

3.3 STD LP2985ITPX-3.3 3000 Units on Tape and Reel

5.0 A LP2985AITP-5.0 250 Units on Tape and Reel

5.0 A LP2985AITPX-5.0 3000 Units on Tape and Reel

5.0 STD LP2985ITP-5.0 250 Units on Tape and Reel

5.0 STD LP2985ITPX-5.0 3000 Units on Tape and Reel

micro SMD, 5 Bump Package (BLA05 - 300 µm ball)

2.85 A LP2985AIBL-285 250 Units on Tape and Reel

2.85 A LP2985AIBLX-285 3000 Units on Tape and Reel

2.85 STD LP2985IBL-285 250 Units on Tape and Reel

2.85 STD LP2985IBLX-285 3000 Units on Tape and Reel

3.0 A LP2985AIBL-3.0 250 Units on Tape and Reel

3.0 A LP2985AIBLX-3.0 3000 Units on Tape and Reel

3.0 STD LP2985IBL-3.0 250 Units on Tape and Reel

3.0 STD LP2985IBLX-3.0 3000 Units on Tape and Reel

3.3 A LP2985AIBL-3.3 250 Units on Tape and Reel

3.3 A LP2985AIBLX-3.3 3000 Units on Tape and Reel

3.3 STD LP2985IBL-3.3 250 Units on Tape and Reel

3.3 STD LP2985IBLX-3.3 3000 Units on Tape and Reel

TABLE 1. Package Marking and Ordering Information (Continued)

Package

Marking

Supplied as:

www.national.com 6

LP2985

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 Temp. (Soldering, 5 sec.) 260˚C

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

Input Supply Voltage (Operating) 2.5V to +16V

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

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

I

(Survival) Short Circuit

OUT

Protected

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

(Note 5))

ESD Rating (Note 2) 2 kV

Power Dissipation (Note 3) Internally Limited

Electrical Characteristics (Note 10)

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

O

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

≤ 150 mA −2.5 2.5 −3.0 3.0

L

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

Line Regulation 0.032 0.032

V

IN–VO

Dropout Voltage

IL=0 1 3 3

(Note 7)

I

= 1 mA 7 10 10

L

I

=10mA 40 60 60

L

I

= 50 mA 120 150 150

L

I

= 150 mA 280 350 350

L

I

GND

Ground Pin Current

IL= 0 65 95 95

(Note 11)

= 1 mA 75 110 110

I

L

I

= 10 mA 120 220 220

L

I

= 50 mA 350 600 600

L

I

= 150 mA 850 1500 1500

L

<

ON/OFF

ON/OFF

ON/OFF

ON/OFF

0.3V 0.01 0.8 0.8

<

0.15V 0.05 2 2

= 0 0.01 −2 −2

=5V 5 15 15

V

ON/OFF

I

ON/OFF

ON/OFF Input Voltage
(Note 8)

ON/OFF Input Current V

V

V

High = O/P ON 1.4 1.6 1.6

Low = O/P OFF 0.55 0.15 0.15

V

= 4.7 µF, V

OUT

= 2V.

ON/OFF

LP2985AI-X.X LP2985I-X.X

Min Max Min Max

−2.5 2.5 −3.5 3.5

−3.5 3.5 −4.0 4.0

55

15 15

90 90

225 225

575 575

125 125

170 170

400 400

1000 1000

2500 2500

Units(Note 6) (Note 6)

%V

NOM

%/V

mV

µA

V

µA

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