LP2978AIM5X-3.8 National Semiconductor, LP2978AIM5X-3.8 Datasheet

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LP2978AIM5X-3.8

Manufacturer Part Number
LP2978AIM5X-3.8
Description
Micropower SOT, 50 mA Low-Noise Ultra Low-Dropout Regulator
Manufacturer
National Semiconductor
Datasheet

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© 2000 National Semiconductor Corporation
LP2978
Micropower SOT, 50 mA Low-Noise Ultra Low-Dropout
Regulator
Designed for Use with Very Low ESR Output Capacitors
General Description
The LP2978 is a 50 mA, fixed-output voltage regulator de-
signed to provide ultra low-dropout and low noise in battery
powered applications.
Using an optimized VIP
cess, the LP2978 delivers unequalled performance in all
specifications critical to battery-powered designs:
Dropout Voltage: Typically 120 mV
@
Ground Pin Current: Typically 350 µA
75 µA
Enhanced Stability: The LP2978 is stable with output ca-
pacitor ESR as low as 5 m , 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 package uses 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).
Block Diagram
VIP
1 mA load.
is a trademark of National Semiconductor Corporation.
@
1 mA load.
(Vertically Integrated PNP) pro-
@
50 mA load, and 7 mV
DS100935
@
50 mA load, and
Features
n Ultra low dropout voltage
n Smallest possible size (SOT-23 Package)
n Requires minimum external components
n Stable with low-ESR output capacitor
n
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
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
<
1 µA quiescent current when shut down
OUT
: 0.3
typical (10 Hz to 1 MHz)
DS100935-1
www.national.com
July 2000

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LP2978AIM5X-3.8 Summary of contents

Page 1

... Low Noise: By adding bypass capacitor, output noise can be reduced to 30 µV (typical). Block Diagram VIP ™ trademark of National Semiconductor Corporation. © 2000 National Semiconductor Corporation Features n Ultra low dropout voltage n Smallest possible size (SOT-23 Package) n Requires minimum external components n Stable with low-ESR output capacitor < ...

Page 2

... A 3.8 STD 3.8 STD www.national.com if this function is not to be used. IN DS100935-3 See NS Package Number MF05A Order Information Package Marking LP2978AIM5X-3.8 LØLA LP2978AIM5-3.8 LØLA LP2978IM5X-3.8 LØLB LP2978IM5-3.8 LØLB 2 DS100935-2 Supplied As: 3000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel ...

Page 3

... Absolute Maximum Ratings 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 Temp. (Soldering, 5 sec.) ESD Rating (Note 2) Power Dissipation (Note 3) Electrical Characteristics Limits in standard typeface are for T ...

Page 4

Electrical Characteristics Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T the ambient temperature The maximum allowable power dissipation at any ambient temperture is calculated using: A Where the value of ...

Page 5

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, the LP2978 requires external capacitors for regulator stability. These capacitors must be correctly selected for good performance. Input Capacitor An input capacitor whose capacitance is between the LP2978 input and ground (the ...

Page 6

Application Hints (Continued) It should also be noted that the ESR of a typical Tantalum will increase about 2:1 as the temperature goes from 25˚C down to −40˚C, so some guard band must be allowed. ON/OFF INPUT OPERATION The LP2978 ...

Page 7

... 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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