LP2981 National Semiconductor, LP2981 Datasheet

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LP2981

Manufacturer Part Number
LP2981
Description
Micropower 100 mA Ultra Low-Dropout Regulator
Manufacturer
National Semiconductor
Datasheet

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© 2000 National Semiconductor Corporation
LP2981
Micropower 100 mA Ultra Low-Dropout Regulator
General Description
The LP2981 is a 100 mA, fixed-output voltage regulator de-
signed
battery-powered applications.
Using an optimized VIP
cess, the LP2981 delivers unequaled performance in all
specifications critical to battery-powered designs:
Dropout Voltage. Typically 200 mV
7 mV
Ground Pin Current. Typically 600 µA
80 µA
Sleep Mode. Less than 1 µA quiescent current when ON/
OFF pin is pulled low.
Smallest Possible Size. SOT-23and 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.
Block Diagram
VIP
is a trademark of National Semiconductor Corporation.
@
@
1 mA load.
1 mA load.
specifically
to
(Vertically Integrated PNP) pro-
meet
the
@
@
DS012506
100 mA load, and
requirements
100 mA load, and
of
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
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 Z
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
<
1 µA quiescent current when shutdown
OUT
over wide frequency range
DS012506-1
www.national.com
March 2000

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LP2981 Summary of contents

Page 1

... LP2981 Micropower 100 mA Ultra Low-Dropout Regulator General Description The LP2981 is a 100 mA, fixed-output voltage regulator de- signed specifically to meet the 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 ...

Page 2

... LP2981IM5-2.8 L77B LP2981AIM5X-2.9 L0VA LP2981AIM5-2.9 L0VA LP2981IM5X-2.9 L0VB LP2981IM5-2.9 L0VB LP2981AIM5X-3.0 L05A LP2981AIM5-3.0 L05A LP2981IM5X-3.0 L05B LP2981IM5-3.0 L05B LP2981AIM5X-3.1 L38A LP2981AIM5-3.1 L38A LP2981IM5X-3.1 L38B LP2981IM5-3.1 L38B LP2981AIM5X-3.2 L35A LP2981AIM5-3.2 L35A LP2981IM5X-3.2 L35B LP2981IM5-3.2 L35B LP2981AIM5X-3.3 L04A LP2981AIM5-3.3 L04A LP2981IM5X-3.3 L04B LP2981IM5-3.3 ...

Page 3

... LP2981AIM5-4.7 L0GA LP2981IM5X-4.7 L0GB LP2981IM5-4.7 L0GB LP2981AIM5X-5.0 L03A LP2981AIM5-5.0 L03A LP2981IM5X-5.0 L03B LP2981IM5-5.0 L03B 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 3 Supplied as: 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel ...

Page 4

... µF OUT (Steady State) 150 L (Note 9) 4 Internally Limited −0.3V to +16V 2.1V to +16V −0.3V to +16V −0.3V to +9V Short Circuit Protected −0.3V to +16V = 4.7 µF,V = 2V. ON/OFF LP2981AI-XX LP2981I-XX (Note 6) (Note 6) Min Max Min Max −0.75 0.75 −1.25 1.25 −1.0 1.0 −2.0 2.0 −2.5 2.5 −3.5 3.5 0.014 0.014 ...

Page 5

... JA cessive 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 V will turn on this diode (see Application Hints). ...

Page 6

Typical Performance Characteristics C = 4.7 µ µF all voltage options, ON/OFF pin tied to V OUT IN Output Voltage vs Temperature Output Voltage vs Temperature Dropout Characteristics www.national.com Unless otherwise specified Output Voltage ...

Page 7

Typical Performance Characteristics C = 4.7 µ µF all voltage options, ON/OFF pin tied to V OUT IN Dropout Voltage vs Temperature Ground Pin Current vs Temperature Input Current Unless otherwise specified ...

Page 8

Typical Performance Characteristics C = 4.7 µ µF all voltage options, ON/OFF pin tied to V OUT IN Line Transient Response Load Transient Response Load Transient Response www.national.com Unless otherwise specified (Continued) IN Line Transient ...

Page 9

Typical Performance Characteristics C = 4.7 µ µF all voltage options, ON/OFF pin tied to V OUT IN Short Circuit Current Short Circuit Current Output Impedance vs Frequency Unless otherwise specified (Continued) IN Instantaneous Short ...

Page 10

Typical Performance Characteristics C = 4.7 µ µF all voltage options, ON/OFF pin tied to V OUT IN Output Noise Density Input to Output Leakage vs Temperature Turn-On Waveform www.national.com Unless otherwise specified (Continued) IN ...

Page 11

... Temperature DS012506-36 CERAMIC: Ceramic capacitors are not recommended for use at the output of the LP2981. This is because the ESR of a ceramic can be low enough to go below the minimum stable value for the LP2981. A 2.2 µF ceramic was measured and found to have an ESR of about which is low enough to cause oscillations ...

Page 12

... ON/OFF INPUT OPERATION DS012506-40 The LP2981 is shut off by pulling the ON/OFF input low, and turned on by driving the input high. If this feature is not to be used, the ON/OFF input should be tied to V regulator on at all times (the ON/OFF input must not be left floating) ...

Page 13

Application Hints (Continued) For best results during assembly, alignment ordinals on the PC board may be used to facilitate placement of the micro SMD device. Micro SMD Light Sensitivity Exposing the micro SMD device to direct sunlight will cause misoperation ...

Page 14

Physical Dimensions For Order Numbers, refer to Table 1 in the “Ordering Information” section of this document. www.national.com inches (millimeters) unless otherwise noted 5-Lead Small Outline Package (M5) NS Package Number MF05A 14 ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. ...

Page 16

... 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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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