Datasheet LP2986AIM-3.3, LP2986AIM-3.0, LP2986IMM-3.0, LP2986IM-5.0, LP2986IM-3.0 Datasheet (NSC)

LP2986
Micropower, 200 mA Ultra Low-Dropout Fixed or
Adjustable Voltage Regulator

LP2986 Micropower, 200 mA Ultra Low-Dropout Fixed or Adjustable Voltage Regulator

March 1999

General Description

The LP2986 is a 200 mA precision LDO voltage regulator
which offers the designer a higher performance version of
the industry standard LP2951.

Using an optimized VIP
cess, the LP2986 delivers superior performance:

Dropout Voltage: Typically 180 mV

@

mV

1 mA load.

Ground Pin Current: Typically 1 mA

@

200 µA
Sleep Mode: The LP2986 draws less than 1 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: The standard product versions available

can be pin-strapped (using the internal resistive divider) to
provide output voltages of 5.0V, 3.3V, or 3.0V with guaran­teed accuracy of 0.5%(“A” grade) and 1%(standard grade)
at room temperature.

10 mA load.

™

(Vertically Integrated PNP) pro-

@

200 mA load, and 1

@

200 mA load, and

Block Diagram

Features

n Ultra low dropout voltage
n Guaranteed 200 mA output current
n SO-8 and mini-SO8 surface mount packages

<

n

1 µA quiescent current when shutdown

n Low ground pin current at all loads
n 0.5%output voltage accuracy (“A” grade)
n High peak current capability (400 mA typical)
n Wide supply voltage range (16V max)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range

Applications

n Cellular Phone
n Palmtop/Laptop Computer
n Camcorder, Personal Stereo, Camera

DS012935-1

VIP™is a trademark ofNational Semiconductor Corporation.

© 1999 National Semiconductor Corporation DS012935 www.national.com

Connection Diagram and Ordering Information

Mini SO-8 Package Type MM: See NS Package Drawing Number MUA08A

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

For ordering information, refer to Table 1 of this document.

Basic Application Circuits

Application Using Internal Resistive Divider

Surface Mount Packages:

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Top View

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Basic Application Circuits (Continued)

Application Using External Divider

Ordering Information

TABLE 1. Package Marking and Ordering Information

Output Voltage Grade Order Information Package Marking Supplied as:

5 A LP2986AIMMX-5.0 L41A 3.5k Units on Tape and Reel
5 A LP2986AIMM-5.0 L41A 250 Units on Tape and Reel
5 STD LP2986IMMX-5.0 L41B 3.5k Units on Tape and Reel
5 STD LP2986IMM-5.0 L41B 250 Units on Tape and Reel

3.3 A LP2986AIMMX-3.3 L40A 3.5k Units on Tape and Reel

3.3 A LP2986AIMM-3.3 L40A 250 Units on Tape and Reel

3.3 STD LP2986IMMX-3.3 L40B 3.5k Units on Tape and Reel

3.3 STD LP2986IMM-3.3 L40B 250 Units on Tape and Reel

3.0 A LP2986AIMMX-3.0 L39A 3.5k Units on Tape and Reel

3.0 A LP2986AIMM-3.0 L39A 250 Units on Tape and Reel

3.0 STD LP2986IMMX-3.0 L39B 3.5k Units on Tape and Reel

3.0 STD LP2986IMM-3.0 L39B 250 Units on Tape and Reel
5 A LP2986AIMX-5.0 2986AIM5.0 2.5k Units on Tape and Reel
5 A LP2986AIM-5.0 2986AIM5.0 Shipped in Anti-Static Rails
5 STD LP2986IMX-5.0 2986IM5.0 2.5k Units on Tape and Reel
5 STD LP2986IM-5.0 2986IM5.0 Shipped in Anti-Static Rails

3.3 A LP2986AIMX-3.3 2986AIM3.3 2.5k Units on Tape and Reel

3.3 A LP2986AIM-3.3 2986AIM3.3 Shipped in Anti-Static Rails

3.3 STD LP2986IMX-3.3 2986IM3.3 2.5k Units on Tape and Reel

3.3 STD LP2986IM-3.3 2986IM3.3 Shipped in Anti-Static Rails

3.0 A LP2986AIMX-3.0 2986AIM3.0 2.5k Units on Tape and Reel

3.0 A LP2986AIM-3.0 2986AIM3.0 Shipped in Anti-Static Rails

3.0 STD LP2986IMX-3.0 2986IM3.0 2.5k Units on Tape and Reel

3.0 STD LP2986IM-3.0 2986IM3.0 Shipped in Anti-Static Rails

DS012935-4

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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

Input Supply Voltage

(Operating) 2.1V to +16V
Shutdown Pin −0.3V to +16V
Feedback Pin −0.3V to +5V
Output Voltage

(Survival) (Note 4) −0.3V to +16V
I

(Survival) Short Circuit Protected

OUT

Input-Output Voltage

(Survival) (Note 5) −0.3V to +16V

ESD Rating (Note 2) 2 kV
Power Dissipation (Note 3) Internally Limited
Input Supply Voltage

(Survival) −0.3V to +16V

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, C

Symbol Parameter Conditions Typical

V

O

Output Voltage
(5.0V Versions)

0.1 mA

<

<

I

L

Output Voltage
(3.3V Versions)

0.1 mA

<

<

I

L

Output Voltage
(3.0V Versions)

Output Voltage Line
Regulation

V

IN–VO

I

GND

I

(PK) Peak Output Current V

O

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

I

O

e

n

Dropout Voltage
(Note 7)

Ground Pin Current IL= 100 µA

Output Noise Voltage
(RMS)

Ripple Rejection f = 1 kHz, C

<

0.1 mA

<

I

L

VO(NOM) + 1V ≤ VIN≤
16V

IL= 100 µA

=75mA

I

L

I

= 200 mA

L

I

=75mA

L

I

= 200 mA

L

<

0.3V 0.05 1.5 1.5 µA

V

S/D

≥ VO(NOM) − 5

OUT

(Note 11)
BW = 300 Hz to 50

OUT

=10µF

OUT

kHz, C

= 4.7 µF, CIN= 2.2 µF, V

OUT

200 mA

200 mA

200 mA

0.007

%

=10µF

= 2V.

S/D

LM2986AI-X.X

(Note 6)

LM2986I-X.X

(Note 6)

Min Max Min Max

5.0 4.975 5.025 4.950 5.050

4.960 5.040 4.920 5.080

5.0

4.910 5.090 4.860 5.140

3.3 3.283 3.317 3.267 3.333

3.274 3.326 3.247 3.353

3.3

3.241 3.359 3.208 3.392

3.0 2.985 3.015 2.970 3.030

2.976 3.024 2.952 3.048

3.0

2.946 3.054 2.916 3.084

0.014 0.014

0.032 0.032

1

90

180

100

500

1

2.0 2.0

3.5 3.5

120 120

170 170

230 230

350 350

120 120

150 150

800 800

1400 1400

2.1 2.1

3.7 3.7

400 250 250
400

160 µV(RMS)

65 dB

Units

V

%

/V

mV

µA

mA

mA

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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, C

Symbol Parameter Conditions Typical

Output Voltage

(Note 9)

Temperature Coefficient

FEEDBACK PIN

V

FB

Feedback Pin Voltage

(Note 10) 1.23 1.19 1.28 1.18 1.29

FB Pin Voltage

(Note 9)

Temperature Coefficient

I

FB

Feedback Pin Bias
Current

FB Pin Bias Current

IL= 200 mA

(Note 9)

Temperature Coefficient

SHUTDOWN INPUT

V

S/D

I

S/D

S/D Input Voltage
(Note 8)

S/D Input Current V

VH= O/P ON 1.4 1.6 1.6

= O/P OFF 0.55 0.18 0.18

V

L

=0 0 −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) = 300 µA

I

O

Upper Threshold
Voltage

Lower Threshold
Voltage

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: The ESD rating of the Feedback pin is 500V and the Tap pin is 1.5 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 temperature is calculated using:

A

= 4.7 µF, CIN= 2.2 µF, V

OUT

20 ppm/˚C

1.23

20 ppm/˚C

150

0.1 nA/˚C

0.01

150

−4.6

−6.6

= 2V.

S/D

LM2986AI-X.X

(Note 6)

LM2986I-X.X

(Note 6)

Min Max Min Max

1.21 1.25 1.20 1.26

330 330

760 760

11

22

220 220

350 350

−5.5 −3.5 −5.5 −3.5

−7.7 −2.5 −7.7 −2.5

−8.9 −4.9 −8.9 −4.9

−13.0 −3.3 −13.0 −3.3

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

J

%

Units

V1.20 1.26 1.19 1.27

nA

V

µA

µA

mV

V

OUT

J−A

,

The value of θ
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 LM2986 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: Toprevent mis-operation, the Shutdown input must be driven by a signal that swings above V

Application Hints).

Note 9: Temperature coefficient is defined as the maximum (worst-case) change divided by the total temperature range.
Note 10: V
Note 11: See Typical Performance Characteristics curves.

for the SO-8 (M) package is 160˚C/W,and the mini SO-8 (MM) package is 200˚C/W. Exceeding the maximum allowable power dissipation will cause

J−A

and V

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

OUT

and below VLwith a slew rate not less than 40 mV/µs (see

H

≤ V

≤ (VIN− 1), 2.5V ≤ VIN≤ 16V, 100 µA≤ IL≤ 200 mA, TJ≤ 125˚C.

FB

OUT

IN

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Typical PerformanceCharacteristics Unless otherwise specified: T

C

= 2.2 µF, S/D is tied to VIN,VIN=VO(NOM) + 1V, IL= 1 mA.

IN

vs Temperature

V

OUT

Dropout Voltage vs Temperature

= 25˚C, C

A

OUT

= 4.7 µF,

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Dropout Voltage vs Load Current

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Ground Pin Current vs Temperature and Load

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Dropout Characteristics

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Ground Pin Current vs Load Current

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Typical Performance Characteristics Unless otherwise specified: T

C

= 2.2 µF, S/D is tied to VIN,VIN=VO(NOM) + 1V, IL= 1 mA. (Continued)

IN

= 25˚C, C

A

OUT

= 4.7 µF,

Input Current vs V

IN

Load Transient Response

Line Transient Response

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DS012935-16

Input Current vs V

IN

Load Transient Response

Line Transient Response

DS012935-15

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Typical Performance Characteristics Unless otherwise specified: T

C

= 2.2 µF, S/D is tied to VIN,VIN=VO(NOM) + 1V, IL= 1 mA. (Continued)

IN

= 25˚C, C

A

OUT

= 4.7 µF,

Turn-On Waveform

Short Circuit Current

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DS012935-24

Turn-Off Waveform

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Short Circuit Current

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Short Circuit Current vs Output Voltage

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Instantaneous Short Circuit Current vs Temperature

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Typical Performance Characteristics Unless otherwise specified: T

C

= 2.2 µF, S/D is tied to VIN,VIN=VO(NOM) + 1V, IL= 1 mA. (Continued)

IN

= 25˚C, C

A

OUT

= 4.7 µF,

DC Load Regulation

Feedback Bias Current vs Temperature

Shutdown Voltage vs Temperature

DS012935-28

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Feedback Bias Current vs Load

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Shutdown Pin Current vs Shutdown Pin Voltage

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Input to Output Leakage vs Temperature

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Typical Performance Characteristics Unless otherwise specified: T

C

= 2.2 µF, S/D is tied to VIN,VIN=VO(NOM) + 1V, IL= 1 mA. (Continued)

IN

= 25˚C, C

A

OUT

= 4.7 µF,

Output Noise Density

Output Impedance vs Frequency

DS012935-34

DS012935-36

Output Impedance vs Frequency

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Ripple Rejection

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Application Hints

EXTERNAL CAPACITORS

Like any low-dropout regulator, external capacitors are re­quired to assure stability.These capacitors mustbe correctly
selected for proper performance.

INPUT CAPACITOR: An input capacitor (≥ 2.2 µF) is re-
quired between the LP2986 input and ground(amount of ca­pacitance may be increased without limit).

This capacitor must be located a distance of not more than

0.5” from the input pin and returned to a clean analog
ground. Any good quality ceramic or tantalum may be used
for this capacitor.

OUTPUT CAPACITOR: The output capacitor must meet the
requirement for minimum amount of capacitance and also
have an appropriate E.S.R. (equivalent series resistance)
value.

Curves are provided which show the allowable ESR range
as a function of load current for various output voltages and
capacitor values (see ESR curves below).

ESR Curves For 5V Output

DS012935-6

ESR Curves For 2.5V Output

DS012935-7

IMPORTANT

the stable region

the application

The minimum required amount of output capacitance is

4.7 µF. Output capacitor size can be increased without limit.
It is important to remember that capacitor tolerance and

variation with temperature must be taken into consideration

: The output capacitor must maintain its ESR in

over the full operating temperature range of

to assure stability.

when selecting an output capacitor so that the minimum re­quired amount of output capacitance is providedover the full
operating temperature range. A good Tantalumcapacitor will
show very little variation with temperature, but a ceramic
may not be as good (see next section).

CAPACITOR CHARACTERISTICS
TANTALUM: The best choice for size, cost, and perfor-

mance are solid tantalum capacitors. Available from many
sources, their typical ESRis very close to the ideal value re­quired on the output of many LDO regulators.

Tantalums also have good temperature stability: a 4.7 µF
was tested and showed only a 10%decline in capacitance
as the temperature was decreased from +125˚C to −40˚C.
The ESR increased only about 2:1 over the same range of
temperature.

However,it should be noted that the increasing ESR at lower
temperatures present in all tantalums can cause oscillations
when marginal quality capacitors are used (where the ESR
of the capacitor is near the upper limit of the stability range at
room temperature).

CERAMIC: For a given amount of a capacitance, ceramics
are usually larger and more costly than tantalums.

Be warned that the ESR of a ceramic capacitor can be low
enough to cause instability:a 2.2 µF ceramic was measured
and found to have an ESR of about 15 mΩ.

If a ceramic capacitor is to be used on the LP2986 output, a
1Ω resistor should be placed in series with the capacitor to
provide a minimum ESR for the regulator.

Another disadvantage of ceramic capacitors is that their ca­pacitance varies a lot with temperature:

Large ceramic capacitors are typically manufactured with the
Z5U temperature characteristic, which results in the capaci­tance dropping by a 50%as the temperature goes from 25˚C
to 80˚C.

This means you have to buy a capacitor with twice the mini­mum C

to assure stable operation up to 80˚C.

OUT

ALUMINUM: The large physicalsize of aluminum electrolyt­ics makes them unattractive for use with the LP2986. Their
ESR characteristics are also not well suited to the require­ments of LDO regulators.

The ESR of an aluminum electrolytic is higher than a tanta­lum, and it also varies greatly with temperature.

A typical aluminum electrolytic can exhibit an ESR increase
of 50X when going from 20˚C to −40˚C. Also, some alumi­num electrolytics can not be used below −25˚C because the
electrolyte will freeze.

USING AN EXTERNAL RESISTIVE DIVIDER

The LP2986 output voltage can be programmed using an ex­ternal resistive divider (see Basic Application Circuits).

The resistor connected between the Feedback pin and
ground should be 51.1k. The value for the other resistor (R1)
connected between the Feedback pin andthe regulatedout­put is found using the formula:

V

= 1.23 x (1 + R1/51.1k)

OUT

It should be noted that the 25 µAof current flowing through
the external divider is approximately equal to the current
saved by not connecting the internal divider, which means
the quiescent current is not increased by using external re­sistors.

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Application Hints (Continued)

A lead compensation capacitor (C
place a zero in the loop response at about 50 kHz. The value
for C

can be found using:

F

= 1/(2π x R1 x 50k)

C

F

A good quality capacitor must be used for C
the value isaccurate and does not change significantly over
temperature. Mica or ceramic capacitors can be used, as­suming a tolerance of

±

20%or better is selected.

If a ceramic is used, select one with a temperature coeffi­cient of NPO, COG, Y5P,or X7R. Capacitor typesZ5U, Y5V,
and Z4V can not be used because their value varies more
that 50%over the −25˚C to +85˚C temperature range.

SHUTDOWN INPUT OPERATION

The LP2986 is shut off by driving the Shutdown input low,
and turned on by pulling it high. If this feature is not to be
used, the Shutdown input should be tied to V
regulator output on at all times.

To assure proper operation, the signal source used to drive
the Shutdown input must be able to swing above and below
the specified turn-on/turn-off voltage thresholds listed as V
and VL, respectively (see Electrical Characteristics).

) must also be used to

F

to ensure that

F

to keep the

IN

It is also importantthat theturn-on (andturn-off) voltage sig­nals applied to the Shutdowninput havea slew ratewhich is
not less than 40 mV/µs.

CAUTION:

the regulator output statecan not be guaranteed
if a slow-moving AC (or DC) signal is applied that is in the
range between V

and VL.

H

REVERSE INPUT-OUTPUT VOLTAGE

The PNP power transistor used as the pass element in the
LP2986 has an inherentdiode connected between the regu­lator output and input.

During normal operation (where the input voltage is higher
than the output) this diode is reverse-biased.

However, if the output is pulled above the input, this diode
will turn ON and current will flow into the regulator output.

In such cases, a parasitic SCR can latch which will allow a
high current to flow into V
can damage the part.

(and out the ground pin), which

IN

In any application where theoutput may bepulled abovethe
input, an external Schottky diode must be connected from
V

to V

IN

verse voltage across the LP2986 to 0.3V (see Absolute

H

Maximum Ratings).

(cathode on VIN, anode on V

OUT

), to limit the re-

OUT

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Physical Dimensions inches (millimeters) unless otherwise noted

8-Lead Mini-Small Outline Molded Package, JEDEC

NS Package Number MUA08A

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

8-Lead (0.150” Wide) Molded Small Outline Package, JEDEC

NS Package Number M08A

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a

LP2986 Micropower, 200 mA Ultra Low-Dropout Fixed or Adjustable Voltage Regulator

significant injury to the user.

National Semiconductor
Corporation

Americas
Tel: [phone]
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