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LP2981 Micropower 100 mA Ultra Low-Dropout Regulator in SOT-23 and micro SMD Packages
February 2006
LP2981
Micropower 100 mA Ultra Low-Dropout Regulator in
SOT-23 and micro SMD Packages
General Description
The LP2981 is a 100 mA, fixed-output voltage regulator
designed specifically to meet the requirements of battery-
powered applications.
Using an optimized VIP
™
(Vertically Integrated PNP) pro-
cess, the LP2981 delivers unequaled performance in all
specifications critical to battery-powered designs:
Dropout Voltage.
Typically 200 mV
@
100 mA load, and
7 mV
@
1 mA load.
Ground Pin Current.
Typically 600 µA
@
100 mA load, and
80 µA
@
1 mA load.
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 an absolute minimum board space.
Precision Output.
0.75% tolerance output voltages avail-
able (A grade).
Eleven voltage options, from 2.5V to 5.0V, are available as
standard products.
Features
n
n
n
n
n
n
n
n
n
n
n
n
Ultra low dropout voltage
Output voltage accuracy 0.75% (A Grade)
Guaranteed 100 mA output current
Smallest possible size (SOT-23, micro SMD package)
<
1 µA quiescent current when shutdown
Low ground pin current at all load currents
High peak current capability (300 mA typical)
Wide supply voltage range (16V max)
Fast dynamic response to line and load
Low Z
OUT
over wide frequency range
Overtemperature/overcurrent protection
−40˚C to +125˚C junction temperature range
Applications
n
n
n
n
Cellular Phone
Palmtop/Laptop Computer
Personal Digital Assistant (PDA)
Camcorder, Personal Stereo, Camera
Block Diagram
01250601
VIP
™
is a trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation
DS012506
www.national.com
LP2981
Connection Diagrams
5-Lead Small Outline Package (M5)
micro SMD, 5 Bump Package (BPA05)
01250602
Top View
See NS Package Number MF05A
For ordering information see
Table 1
01250650
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.
Top View
See NS Package Number BPA05
Pin Descriptions
Name
SOT-23
V
IN
GND
ON/OFF
N/C
V
OUT
1
2
3
4
5
Pin Number
micro SMD
C3
A1
A3
B2
C1
Input Voltage
Common Ground (device substrate)
Logic high enable input
Post package trim -
do not
connect to this pin
Regulated output voltage
Function
Ordering Information
TABLE 1. Package Marking and Order Information
Output Voltage
(V)
2.5
2.5
2.5
2.5
2.7
2.7
2.7
2.7
2.8
2.8
2.8
2.8
2.9
2.9
2.9
2.9
3.0
3.0
3.0
3.0
www.national.com
Grade
Order Information
Package
Marking
L0CA
L0CA
L0CB
L0CB
L0DA
L0DA
L0DB
L0DB
L77A
L77A
L77B
L77B
L0VA
L0VA
L0VB
L0VB
L05A
L05A
L05B
L05B
2
Supplied as:
5-Lead Small Outline Package (M5)
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
LP2981AIM5X-2.5
LP2981AIM5-2.5
LP2981IM5X-2.5
LP2981IM5-2.5
LP2981AIM5X-2.7
LP2981AIM5-2.7
LP2981IM5X-2.7
LP2981IM5-2.7
LP2981AIM5X-2.8
LP2981AIM5-2.8
LP2981IM5X-2.8
LP2981IM5-2.8
LP2981AIM5X-2.9
LP2981AIM5-2.9
LP2981IM5X-2.9
LP2981IM5-2.9
LP2981AIM5X-3.0
LP2981AIM5-3.0
LP2981IM5X-3.0
LP2981IM5-3.0
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
LP2981
Ordering Information
Output Voltage
(V)
3.1
3.1
3.1
3.1
3.2
3.2
3.2
3.2
3.3
3.3
3.3
3.3
3.6
3.6
3.6
3.6
3.8
3.8
3.8
3.8
4.0
4.0
4.0
4.0
4.7
4.7
4.7
4.7
5.0
5.0
5.0
5.0
2.5
2.5
2.5
2.5
3.2
3.2
3.2
3.2
3.3
3.3
3.3
3.3
Grade
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
(Continued)
TABLE 1. Package Marking and Order Information
(Continued)
Order Information
LP2981AIM5X-3.1
LP2981AIM5-3.1
LP2981IM5X-3.1
LP2981IM5-3.1
LP2981AIM5X-3.2
LP2981AIM5-3.2
LP2981IM5X-3.2
LP2981IM5-3.2
LP2981AIM5X-3.3
LP2981AIM5-3.3
LP2981IM5X-3.3
LP2981IM5-3.3
LP2981AIM5X-3.6
LP2981AIM5-3.6
LP2981IM5X-3.6
LP2981IM5-3.6
LP2981AIM5X-3.8
LP2981AIM5-3.8
LP2981IM5X-3.8
LP2981IM5-3.8
LP2981AIM5X-4.0
LP2981AIM5-4.0
LP2981IM5X-4.0
LP2981IM5-4.0
LP2981AIM5X-4.7
LP2981AIM5-4.7
LP2981IM5X-4.7
LP2981IM5-4.7
LP2981AIM5X-5.0
LP2981AIM5-5.0
LP2981IM5X-5.0
LP2981IM5-5.0
LP2981AIBP-2.5
LP2981AIBPX-2.5
LP2981IBP-2.5
LP2981IBPX-2.5
LP2981AIBP-3.2
LP2981AIBPX-3.2
LP2981IBP-3.2
LP2981IBPX-3.2
LP2981AIBP-3.3
LP2981AIBPX-3.3
LP2981IBP-3.3
LP2981IBPX-3.3
Package
Marking
L38A
L38A
L38B
L38B
L35A
L35A
L35B
L35B
L04A
L04A
L04B
L04B
L0JA
L0JA
L0JB
L0JB
L36A
L36A
L36B
L36B
L0ZA
L0ZA
L0ZB
L0ZB
L0GA
L0GA
L0GB
L0GB
L03A
L03A
L03B
L03B
Supplied as:
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
micro SMD, 5 Bump Package (BPA05)
3
www.national.com
LP2981
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
Operating Junction Temperature
Range
Lead Temperature
(Soldering, 5 sec.)
ESD Rating (Note 2)
Power Dissipation (Note 3)
−65˚C to +150˚C
−40˚C to +125˚C
260˚C
2 kV
Internally Limited
Input Supply Voltage (Survival)
Input Supply Voltage (Operating)
Shutdown Input Voltage
(Survival)
Output Voltage (Survival, (Note
4))
I
OUT
(Survival)
Input-Output Voltage
(Survival, (Note 5)
−0.3V to +16V
2.1V to +16V
−0.3V to +16V
−0.3V to +9V
Short Circuit
Protected
−0.3V to +16V
Electrical Characteristics
(Note 10)
Limits in standard typeface are for T
J
= 25˚C, and limits in
boldface type
applyover the full operating temperature range. Un-
less otherwise specified: V
IN
= V
O(NOM)
+ 1V, C
IN
= 1 µF, I
L
= 1 mA, C
OUT
= 4.7 µF,V
ON/OFF
= 2V.
Symbol
Parameter
Conditions
Typ
LP2981AI-XX
(Note 6)
Min
∆V
O
Output Voltage
Tolerance
I
L
= 1mA
1 mA
<
I
L
<
100 mA
Output Voltage
Line Regulation
V
IN
–V
O
Dropout Voltage
(Note 7)
I
L
= 1 mA
I
L
= 25 mA
I
L
= 100 mA
I
GND
Ground Pin Current
I
L
= 0
I
L
= 1 mA
I
L
= 25 mA
I
L
= 100 mA
V
ON/OFF
<
0.3V
V
ON/OFF
<
0.15V
V
ON/OFF
I
ON/OFF
I
O(PK)
e
n
ON/OFF Input Voltage
(Note 8)
ON/OFF Input Current
Peak Output Current
Output Noise
Voltage (RMS)
Ripple Rejection
High = O/P ON
Low = O/P OFF
V
ON/OFF
= 0
V
ON/OFF
= 5V
V
OUT
≥
V
O(NOM)
− 5%
BW = 300 Hz–50 kHz,
C
OUT
= 10 µF
f = 1 kHz
C
OUT
= 10 µF
I
O(MAX)
www.national.com
LP2981I-XX
(Note 6)
Min
−1.25
−2.0
−3.5
Max
1.25
2.0
3.5
0.014
0.032
3
5
10
15
100
150
250
375
95
125
110
170
300
550
800
1500
0.8
2
1.6
Units
Max
0.75
1.0
2.5
0.014
0.032
−0.75
−1.0
−2.5
0.007
%V
NOM
V
O(NOM)
+ 1V
≤
V
IN
≤
16V
I
L
= 0
%/V
1
7
70
200
65
80
200
600
0.01
0.05
1.4
0.50
0.01
5
400
160
63
150
1.6
3
5
10
15
100
150
250
375
95
125
110
170
300
550
800
1500
0.8
2
0.15
−1
15
150
mV
µA
V
0.15
−1
15
mA
µV
dB
µA
Short Circuit Current
R
L
= 0 (Steady State)
4
150
mA
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