May 2005
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 batterypowered applications.
Using an optimized VIP™ (Vertically Integrated PNP) process, 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 available (A grade).
Eleven voltage options, from 2.5V to 5.0V, are available as standard products.
Features
n Ultra low dropout voltage
n Output voltage accuracy 0.75% (A Grade) n Guaranteed 100 mA output current
n Smallest possible size (SOT-23, micro SMD package) n < 1 µA quiescent current when shutdown
n Low ground pin current at all load currents n High peak current capability (300 mA typical) n Wide supply voltage range (16V max)
n Fast dynamic response to line and load n Low ZOUT over wide frequency range n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
Applications
n Cellular Phone
n Palmtop/Laptop Computer
n Personal Digital Assistant (PDA)
n Camcorder, Personal Stereo, Camera
Block Diagram
01250601
VIP™ is a trademark of National Semiconductor Corporation.
Packages SMD micro and 23-SOT in Regulator Dropout-Low Ultra mA 100 Micropower LP2981
© 2005 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 Descrption
Name |
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Pin Number |
Function |
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SOT-23 |
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micro SMD |
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VIN |
1 |
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C3 |
Input Voltage |
GND |
2 |
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A1 |
Common Ground (device substrate) |
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ON/OFF |
3 |
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A3 |
Logic high enable input |
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N/C |
4 |
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B2 |
Post package trim - do not connect to this pin |
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VOUT |
5 |
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C1 |
Regulated output voltage |
Ordering Information
TABLE 1. Package Marking and Order Information
Output Voltage |
Grade |
Order Information |
Package |
Supplied as: |
(V) |
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Marking |
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5-Lead Small Outline Package (M5) |
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2.5 |
A |
LP2981AIM5X-2.5 |
L0CA |
3000 Units on Tape and Reel |
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2.5 |
A |
LP2981AIM5-2.5 |
L0CA |
1000 Units on Tape and Reel |
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2.5 |
STD |
LP2981IM5X-2.5 |
L0CB |
3000 Units on Tape and Reel |
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2.5 |
STD |
LP2981IM5-2.5 |
L0CB |
1000 Units on Tape and Reel |
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2.7 |
A |
LP2981AIM5X-2.7 |
L0DA |
3000 Units on Tape and Reel |
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2.7 |
A |
LP2981AIM5-2.7 |
L0DA |
1000 Units on Tape and Reel |
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2.7 |
STD |
LP2981IM5X-2.7 |
L0DB |
3000 Units on Tape and Reel |
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2.7 |
STD |
LP2981IM5-2.7 |
L0DB |
1000 Units on Tape and Reel |
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2.8 |
A |
LP2981AIM5X-2.8 |
L77A |
3000 Units on Tape and Reel |
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2.8 |
A |
LP2981AIM5-2.8 |
L77A |
1000 Units on Tape and Reel |
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2.8 |
STD |
LP2981IM5X-2.8 |
L77B |
3000 Units on Tape and Reel |
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2.8 |
STD |
LP2981IM5-2.8 |
L77B |
1000 Units on Tape and Reel |
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2.9 |
A |
LP2981AIM5X-2.9 |
L0VA |
3000 Units on Tape and Reel |
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2.9 |
A |
LP2981AIM5-2.9 |
L0VA |
1000 Units on Tape and Reel |
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2.9 |
STD |
LP2981IM5X-2.9 |
L0VB |
3000 Units on Tape and Reel |
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2.9 |
STD |
LP2981IM5-2.9 |
L0VB |
1000 Units on Tape and Reel |
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3.0 |
A |
LP2981AIM5X-3.0 |
L05A |
3000 Units on Tape and Reel |
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3.0 |
A |
LP2981AIM5-3.0 |
L05A |
1000 Units on Tape and Reel |
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3.0 |
STD |
LP2981IM5X-3.0 |
L05B |
3000 Units on Tape and Reel |
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3.0 |
STD |
LP2981IM5-3.0 |
L05B |
1000 Units on Tape and Reel |
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www.national.com |
2 |
Ordering Information |
(Continued) |
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TABLE 1. Package Marking and Order Information (Continued) |
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Output Voltage |
Grade |
Order Information |
Package |
Supplied as: |
(V) |
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Marking |
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3.1 |
A |
LP2981AIM5X-3.1 |
L38A |
3000 Units on Tape and Reel |
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3.1 |
A |
LP2981AIM5-3.1 |
L38A |
1000 Units on Tape and Reel |
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3.1 |
STD |
LP2981IM5X-3.1 |
L38B |
3000 Units on Tape and Reel |
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3.1 |
STD |
LP2981IM5-3.1 |
L38B |
1000 Units on Tape and Reel |
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3.2 |
A |
LP2981AIM5X-3.2 |
L35A |
3000 Units on Tape and Reel |
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3.2 |
A |
LP2981AIM5-3.2 |
L35A |
1000 Units on Tape and Reel |
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3.2 |
STD |
LP2981IM5X-3.2 |
L35B |
3000 Units on Tape and Reel |
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3.2 |
STD |
LP2981IM5-3.2 |
L35B |
1000 Units on Tape and Reel |
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3.3 |
A |
LP2981AIM5X-3.3 |
L04A |
3000 Units on Tape and Reel |
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3.3 |
A |
LP2981AIM5-3.3 |
L04A |
1000 Units on Tape and Reel |
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3.3 |
STD |
LP2981IM5X-3.3 |
L04B |
3000 Units on Tape and Reel |
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3.3 |
STD |
LP2981IM5-3.3 |
L04B |
1000 Units on Tape and Reel |
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3.6 |
A |
LP2981AIM5X-3.6 |
L0JA |
3000 Units on Tape and Reel |
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3.6 |
A |
LP2981AIM5-3.6 |
L0JA |
1000 Units on Tape and Reel |
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3.6 |
STD |
LP2981IM5X-3.6 |
L0JB |
3000 Units on Tape and Reel |
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3.6 |
STD |
LP2981IM5-3.6 |
L0JB |
1000 Units on Tape and Reel |
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3.8 |
A |
LP2981AIM5X-3.8 |
L36A |
3000 Units on Tape and Reel |
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3.8 |
A |
LP2981AIM5-3.8 |
L36A |
1000 Units on Tape and Reel |
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3.8 |
STD |
LP2981IM5X-3.8 |
L36B |
3000 Units on Tape and Reel |
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3.8 |
STD |
LP2981IM5-3.8 |
L36B |
1000 Units on Tape and Reel |
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4.0 |
A |
LP2981AIM5X-4.0 |
L0ZA |
3000 Units on Tape and Reel |
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4.0 |
A |
LP2981AIM5-4.0 |
L0ZA |
1000 Units on Tape and Reel |
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4.0 |
STD |
LP2981IM5X-4.0 |
L0ZB |
3000 Units on Tape and Reel |
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4.0 |
STD |
LP2981IM5-4.0 |
L0ZB |
1000 Units on Tape and Reel |
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4.7 |
A |
LP2981AIM5X-4.7 |
L0GA |
3000 Units on Tape and Reel |
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4.7 |
A |
LP2981AIM5-4.7 |
L0GA |
1000 Units on Tape and Reel |
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4.7 |
STD |
LP2981IM5X-4.7 |
L0GB |
3000 Units on Tape and Reel |
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4.7 |
STD |
LP2981IM5-4.7 |
L0GB |
1000 Units on Tape and Reel |
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5.0 |
A |
LP2981AIM5X-5.0 |
L03A |
3000 Units on Tape and Reel |
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5.0 |
A |
LP2981AIM5-5.0 |
L03A |
1000 Units on Tape and Reel |
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5.0 |
STD |
LP2981IM5X-5.0 |
L03B |
3000 Units on Tape and Reel |
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5.0 |
STD |
LP2981IM5-5.0 |
L03B |
1000 Units on Tape and Reel |
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micro SMD, 5 Bump Package (BPA05) |
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||
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2.5 |
A |
LP2981AIBP-2.5 |
|
250 Units on Tape and Reel |
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2.5 |
A |
LP2981AIBPX-2.5 |
|
3000 Units on Tape and Reel |
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2.5 |
STD |
LP2981IBP-2.5 |
|
250 Units on Tape and Reel |
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2.5 |
STD |
LP2981IBPX-2.5 |
|
3000 Units on Tape and Reel |
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3.2 |
A |
LP2981AIBP-3.2 |
|
250 Units on Tape and Reel |
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3.2 |
A |
LP2981AIBPX-3.2 |
|
3000 Units on Tape and Reel |
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3.2 |
STD |
LP2981IBP-3.2 |
|
250 Units on Tape and Reel |
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3.2 |
STD |
LP2981IBPX-3.2 |
|
3000 Units on Tape and Reel |
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3.3 |
A |
LP2981AIBP-3.3 |
|
250 Units on Tape and Reel |
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3.3 |
A |
LP2981AIBPX-3.3 |
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3000 Units on Tape and Reel |
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3.3 |
STD |
LP2981IBP-3.3 |
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250 Units on Tape and Reel |
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3.3 |
STD |
LP2981IBPX-3.3 |
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3000 Units on Tape and Reel |
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LP2981
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 |
−65˚C to +150˚C |
Operating Junction Temperature |
|
Range |
−40˚C to +125˚C |
Lead Temperature |
|
(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) |
2.1V to +16V |
Shutdown Input Voltage |
|
(Survival) |
−0.3V to +16V |
Output Voltage (Survival, (Note |
|
4)) |
−0.3V to +9V |
IOUT (Survival) |
Short Circuit |
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Protected |
Input-Output Voltage |
|
(Survival, (Note 5) |
−0.3V to +16V |
Electrical Characteristics (Note 10)
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type applyover the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF,VON/OFF = 2V.
Symbol |
Parameter |
Conditions |
Typ |
LP2981AI-XX |
LP2981I-XX |
Units |
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(Note 6) |
(Note 6) |
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Min |
Max |
Min |
Max |
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∆VO |
Output Voltage |
IL = 1mA |
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−0.75 |
0.75 |
−1.25 |
1.25 |
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Tolerance |
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%VNOM |
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1 mA < IL < 100 mA |
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−1.0 |
1.0 |
−2.0 |
2.0 |
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−2.5 |
2.5 |
−3.5 |
3.5 |
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Output Voltage |
VO(NOM) + 1V |
0.007 |
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0.014 |
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0.014 |
%/V |
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Line Regulation |
≤ VIN ≤ 16V |
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0.032 |
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0.032 |
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VIN–VO |
Dropout Voltage |
IL = 0 |
1 |
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3 |
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3 |
mV |
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(Note 7) |
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5 |
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5 |
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IL = 1 mA |
7 |
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10 |
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10 |
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15 |
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15 |
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IL = 25 mA |
70 |
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100 |
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100 |
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150 |
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150 |
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IL = 100 mA |
200 |
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250 |
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250 |
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375 |
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375 |
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IGND |
Ground Pin Current |
IL = 0 |
65 |
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95 |
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95 |
µA |
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125 |
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125 |
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IL = 1 mA |
80 |
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110 |
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110 |
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170 |
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170 |
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IL = 25 mA |
200 |
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300 |
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300 |
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550 |
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550 |
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IL = 100 mA |
600 |
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800 |
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800 |
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1500 |
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1500 |
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VON/OFF < 0.3V |
0.01 |
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0.8 |
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0.8 |
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VON/OFF < 0.15V |
0.05 |
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2 |
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2 |
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VON/OFF |
ON/OFF Input Voltage |
High = O/P ON |
1.4 |
1.6 |
|
1.6 |
|
V |
|
(Note 8) |
Low = O/P OFF |
0.50 |
|
0.15 |
|
0.15 |
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ION/OFF |
ON/OFF Input Current |
VON/OFF = 0 |
0.01 |
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−1 |
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−1 |
µA |
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VON/OFF = 5V |
5 |
|
15 |
|
15 |
|
IO(PK) |
Peak Output Current |
VOUT ≥ VO(NOM) − 5% |
400 |
150 |
|
150 |
|
mA |
en |
Output Noise |
BW = 300 Hz–50 kHz, |
160 |
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µV |
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Voltage (RMS) |
COUT = 10 µF |
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Ripple Rejection |
f = 1 kHz |
63 |
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dB |
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COUT = 10 µF |
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IO(MAX) |
Short Circuit Current |
RL = 0 (Steady State) |
150 |
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|
mA |
www.national.com |
4 |
Electrical Characteristics (Note 10) (Continued)
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type applyover the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF,VON/OFF = 2V.
Symbol |
Parameter |
Conditions |
Typ |
LP2981AI-XX |
LP2981I-XX |
Units |
||
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|
(Note 6) |
(Note 6) |
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||
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Min |
Max |
Min |
Max |
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(Note 9) |
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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 for the SOT-23 package, or pins 5 and 2 for the micro SMD package, is 1 kV.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
The value of θJA for the SOT-23 package is 220˚C/W and the micro SMD package is 225˚C/W. 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 LP2981 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the VIN and VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT will turn on this diode (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: The ON/OFF inputs must be properly driven to prevent misoperation. For details, refer to Application Hints.
Note 9: See Typical Performance Characteristics curves.
Note 10: Exposing the micro SMD device to direct sunlight will cause misoperation. See Application Hints for additional information.
Basic Application Circuit
01250604
*ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used.
**Minimum Output Capacitance is shown to insure stability over full load current range. More capacitance provides superior dynamic performance and additional stability margin (see Application Hints).
***Do not make connections to this pin.
LP2981
5 |
www.national.com |
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