NSC LP2985AIBP-2.8, LP2985AIBP-2.5, LP2985IM5X-5.0, LP2985IM5X-3.3, LP2985IM5X-2.5 Datasheet

LP2985
Micropower 150 mA Low-Noise Ultra Low-Dropout
Regulator

Designed for Use with Very Low ESR Output Capacitors

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

™

(Vertically Integrated PNP) pro­cess, the LP2985 delivers unequalled performance in all
specifications critical to battery-powered designs:

Dropout Voltage: Typically 300 mV

@

150 mA load, and

7mV

@

1 mA load.

Ground Pin Current: Typically 850 µA

@

150 mA load, and

75 µA

@

1 mA load.

Enhanced Stability: The LP2985 is stable with output ca­pacitor 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.

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

OUT

: 0.3Ω typical (10 Hz to 1 MHz)

n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
n Custom voltages available

Applications

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

Block Diagram

VIP™is a trademark of NationalSemiconductor Corporation.

DS100140-1

March 2000

LP2985 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator

© 2000 National Semiconductor Corporation DS100140 www.national.com

Basic Application Circuit

Connection Diagrams

DS100140-2

*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).

5-Lead Small Outline Package (M5)

DS100140-3

Top View

See NS Package Number MF05A

For ordering information see

Table 1

micro SMD, 5 Bump Package (BPA05)

DS100140-44

Bottom View

See NS Package Number BPA05

LP2985

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Ordering Information

TABLE 1. Package Marking and Ordering Information

Output Voltage

(V)

Grade Order Information

Package

Marking

Supplied as:

5-Lead Small Outline Package (M5)

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

2.7 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

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

LP2985

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Ordering Information (Continued)

TABLE 1. Package Marking and Ordering Information (Continued)

Output Voltage

(V)

Grade Order Information

Package

Marking

Supplied as:

5-Lead Small Outline Package (M5)

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

4.7 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

micro SMD, 5 Bump Package (BPA05)

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

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

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 LP2985IBPX-3.3 250 Units on Tape and Reel

3.3 STD LP2985IBPX-3.3 3000 Units on Tape and Reel

LP2985

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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 Temp. (Soldering, 5 sec.) 260˚C
ESD Rating (Note 2) 2 kV
Power Dissipation (Note 3) Internally Limited

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

OUT

(Survival) Short Circuit

Protected

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

(Note 5))

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: VIN=VO(NOM) + 1V, IL= 1 mA, CIN= 1 µF, C

OUT

= 4.7 µF, V

ON/OFF

= 2V.

Symbol Parameter Conditions Typ

LP2985AI-X.X LP2985I-X.X

Units(Note 6) (Note 6)

Min Max Min Max

∆V

O

Output Voltage
Tolerance

IL= 1 mA −1.0 1.0 −1.5 1.5

%V

NOM

1mA≤IL≤50 mA −1.5 1.5 −2.5 2.5

−2.5 2.5 −3.5 3.5

1mA≤I

L

≤150 mA −2.5 2.5 −3.0 3.0

−3.5 3.5 −4.0 4.0

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

%/V

Line Regulation 0.032 0.032

V

IN–VO

Dropout Voltage
(Note 7)

IL=0 1 3 3

mV

55

I

L

= 1 mA 7 10 10

15 15

I

L

=10mA 40 60 60

90 90

I

L

= 50 mA 120 150 150

225 225

I

L

= 150 mA 280 350 350

575 575

I

GND

Ground Pin Current IL= 0 65 95 95

µA

125 125

I

L

= 1 mA 75 110 110

170 170

I

L

= 10 mA 120 220 220

400 400

I

L

= 50 mA 350 600 600

1000 1000

I

L

= 150 mA 850 1500 1500

2500 2500

V

ON/OFF

<

0.3V 0.01 0.8 0.8

V

ON/OFF

<

0.15V 0.05 2 2

V

ON/OFF

ON/OFF Input Voltage
(Note 8)

High = O/P ON 1.4 1.6 1.6

V

Low = O/P OFF 0.55 0.15 0.15

I

ON/OFF

ON/OFF Input Current V

ON/OFF

= 0 0.01 −2 −2

µA

V

ON/OFF

=5V 5 15 15

e

n

Output Noise BW = 300 Hz to 50 kHz,
Voltage (RMS) C

OUT

=10µF 30 µV

C

BYPASS

=10nF

LP2985

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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: VIN=VO(NOM) + 1V, IL= 1 mA, CIN= 1 µF, C

OUT

= 4.7 µF, V

ON/OFF

= 2V.

Symbol Parameter Conditions Typ

LP2985AI-X.X LP2985I-X.X

Units(Note 6) (Note 6)

Min Max Min Max

Ripple Rejection f = 1 kHz, C

BYPASS

=10nF

45 dB

C

OUT

=10µF

I

O

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

400 mA

(Note 9)

I

O

(PK) Peak Output Current V

OUT

≥ Vo(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 is 1 kV.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T

J

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

J-A

, and

the ambient temperature, T

A

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

Where the value of θ

J-A

for the SOT-23 package is 220˚C/W in a typical PC board mounting and the micro SMD package is 320˚C/W. Exceeding the maximum al-

lowable 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 LP2985 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the V

IN

to V

OUT

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

OUT

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: 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: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.
Note 9: The LP2985 has foldback current limiting which allows a high peak current when V

OUT

>

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

OUT

is

forced to ground (see Typical Performance Characteristics curves).

LP2985

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