Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LP3929TME-AACQ Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LP3929TME-AACQ
Description  High Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator and Line
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP3929TME-AACQ Datasheet(HTML) 11 Page - National Semiconductor (TI)

Back Button LP3929TME-AACQ Datasheet HTML 4Page - National Semiconductor (TI) LP3929TME-AACQ Datasheet HTML 5Page - National Semiconductor (TI) LP3929TME-AACQ Datasheet HTML 6Page - National Semiconductor (TI) LP3929TME-AACQ Datasheet HTML 7Page - National Semiconductor (TI) LP3929TME-AACQ Datasheet HTML 8Page - National Semiconductor (TI) LP3929TME-AACQ Datasheet HTML 9Page - National Semiconductor (TI) LP3929TME-AACQ Datasheet HTML 10Page - National Semiconductor (TI) LP3929TME-AACQ Datasheet HTML 11Page - National Semiconductor (TI) LP3929TME-AACQ Datasheet HTML 12Page - National Semiconductor (TI)  
Zoom Inzoom in Zoom Outzoom out
 11 / 12 page
background image
Application Information
EXTERNAL CAPACITORS
Like any low-dropout regulator, the LP3929 requires external
capacitors for regulator stability. The LP3929 is specifically
designed for portable applications requiring minimum board
space and smallest components. These capacitors must be
correctly selected for good performance.
INPUT CAPACITOR
An input capacitance of 1 µF is required between the
LP3929 V
BAT pin and ground (the amount of the capacitance
may be increased without limit).
This capacitor must be located a distance of not more than
1 cm from the V
BAT pin and returned to a clean analog
ground. Any good quality ceramic, tantalum, or film capacitor
may be used at the input.
Important: Tantalum capacitors can suffer catastrophic fail-
ures due to surge current when connected to a low-
impedance source of power (like a battery or a very large
capacitor). If a tantalum capacitor is used at the input, it must
be guaranteed by the manufacturer to have a surge current
rating sufficient for the application.
There are no requirements for the ESR on the input capaci-
tor, but tolerance, bias voltage and temperature coefficient
must be considered when selecting the capacitor to ensure
the capacitance will be 1 µF over the entire operating con-
ditions.
FAST ON-TIME
The LP3929 utilizes a speed up circuitry to ramp up the
internal V
REF voltage to its final value to achieve a fast
output turn on time.
CAPACITOR CHARACTERISTICS
The LP3929 is designed to work with ceramic capacitors on
the output to take advantage of the benefits they offer: for
capacitance values in the range of 1 µF to 4.7 µF range,
ceramic capacitors are the smallest, least expensive and
have the lowest ESR values (which makes them best for
eliminating high frequency noise). The ESR of a typical 1 µF
ceramic capacitor is in the range of 20 m
Ω to 40 mΩ, which
easily meets the ESR requirement for stability by the
LP3929.
The ceramic capacitor’s capacitance can vary with tempera-
ture.
Most large value ceramic capacitors (2.2 µF) are manufac-
tured with Z5U or Y5V temperature characteristics, which
results in the capacitance dropping by more than 50% as the
temperature goes from 25˚C to 85˚C.
A better choice for temperature coefficient in ceramic capaci-
tor is X7R, which holds the capacitance within ±15%.
Tantalum capacitors are less desirable than ceramic for use
as output capacitors because they are more expensive when
comparing equivalent capacitance and voltage ratings in the
1 µF to 4.7 µF range.
Another important consideration is that tantalum capacitors
have higher ESR values than equivalent size ceramics. This
means that while it may be possible to find a tantalum
capacitor with an ESR value within the stable range, it would
have to be larger in capacitance (which means bigger and
more costly) than a ceramic capacitor with the same ESR
value. 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.
OUTPUT CAPACITOR
The LP3929 is designed specifically to work with very small
ceramic output capacitors, any ceramic capacitor (dielectric
types Z5U, Y5V or X7R) in 1.0 µF to 2.2 µF range with 5 m
to 500 m
Ω ESR range is suitable in the LP3929 application
circuit.
It may also be possible to use tantalum or film capacitors at
the output, but these are not as attractive for reasons of size
and cost (see section Capacitor Characteristics).
The output capacitor must meet the requirement for mini-
mum amount of capacitance and also have an ESR (Equiva-
lent Series Resistance) value which is within a stable range.
The output capacitor should be placed as near as possible to
the V
DDB pin.
NO-LOAD STABILITY
The LDO of the LP3929 will remain stable and in regulation
with no external load connected to the LDO output V
DDB.
This is especially important in CMOS RAM keep-alive appli-
cations.
MICRO SMD ASSEMBLY
For assembly recommendations of micro SMD package
please refer to National Semiconductor Application Note
AN-1112.
MICRO SMD LIGHT SENSITIVITY
Exposing the micro SMD device to direct sunlight will cause
misoperation of the device. Light sources such as Halogen
lamps can effect electrical performance if brought near to the
device.
The wavelengths which have most detrimental effect are
reds and infra-reds, which means that the fluorescent light-
ing used inside most buildings has very little effect on
performance.
www.national.com
11


Similar Part No. - LP3929TME-AACQ

ManufacturerPart #DatasheetDescription
logo
Intersil Corporation
LP3929 INTERSIL-LP3929 Datasheet
327Kb / 14P
   High Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator and Line Protection
More results

Similar Description - LP3929TME-AACQ

ManufacturerPart #DatasheetDescription
logo
Intersil Corporation
LP3929 INTERSIL-LP3929 Datasheet
327Kb / 14P
   High Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator and Line Protection
logo
National Semiconductor ...
LP3928 NSC-LP3928 Datasheet
240Kb / 11P
   High Speed Bi-Directional Level Shifter and Ultra Low-Dropout CMOS Voltage Regulator
logo
Seiko Instruments Inc
S-1206 SII-S-1206 Datasheet
653Kb / 36P
   ULTRA LOW CURRENT CONSUMPTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
logo
ABLIC Inc.
S-1206 ABLIC-S-1206 Datasheet
566Kb / 35P
   ULTRA LOW CURRENT CONSUMPTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.2_02
logo
Seiko Instruments Inc
S-1167 SII-S-1167 Datasheet
474Kb / 31P
   ULTRA LOW CURRENT CONSUMPTION, HIGH RIPPLE REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
logo
ABLIC Inc.
S-1167 ABLIC-S-1167 Datasheet
546Kb / 31P
   ULTRA LOW CURRENT CONSUMPTION, HIGH RIPPLE REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.2_02
S-1112 ABLIC-S-1112 Datasheet
494Kb / 30P
   HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_02
logo
Seiko Instruments Inc
S-1112 SII-S-1112 Datasheet
388Kb / 29P
   HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
logo
ABLIC Inc.
S-L2980 ABLIC-S-L2980 Datasheet
447Kb / 23P
   HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.5.1_02
logo
Seiko Instruments Inc
S-L2980 SII-S-L2980_1 Datasheet
327Kb / 23P
   HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com