数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

LD2980CU25TR 数据表(PDF) 11 Page - STMicroelectronics

部件名 LD2980CU25TR
功能描述  VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT LOW ESR OUTPUT CAPACITORS COMPATIBLE
Download  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

LD2980CU25TR 数据表(HTML) 11 Page - STMicroelectronics

Back Button LD2980CU25TR Datasheet HTML 7Page - STMicroelectronics LD2980CU25TR Datasheet HTML 8Page - STMicroelectronics LD2980CU25TR Datasheet HTML 9Page - STMicroelectronics LD2980CU25TR Datasheet HTML 10Page - STMicroelectronics LD2980CU25TR Datasheet HTML 11Page - STMicroelectronics LD2980CU25TR Datasheet HTML 12Page - STMicroelectronics LD2980CU25TR Datasheet HTML 13Page - STMicroelectronics LD2980CU25TR Datasheet HTML 14Page - STMicroelectronics LD2980CU25TR Datasheet HTML 15Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 17 page
background image
LD2980 SERIES
11/17
APPLICATION NOTES
EXTERNAL CAPACITORS
Like any low-dropout regulator, the LD2980 requires external capacitors for regulator stability. This
capacitor must be selected to meet the requirements of minimum capacitance and equivalent series
resistance. We suggest to solder input and output capacitors as close as possible to the relative pins.
INPUT CAPACITOR
An input capacitor whose value is 1µF is required with the LD2980 (amount of capacitance can be
increased without limit). This capacitor must be located a distance of not more than 0.5" from the input pin
of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors
can be used for this capacitor.
OUTPUT CAPACITOR
The LD2980 is designed specifically to work with ceramic output capacitors. It may also be possible to use
Tantalum capacitors, but these are not as attractive for reasons of size and cost. By the way, the output
capacitor must meet both the requirement for minimum amount of capacitance and ESR (equivalent
series resistance) value. The figures 1 and 2 show the allowable ESR range as a function of the output
capacitance. These curves represent the stability region over the full temperature and IO range. Due to
the different loop gain, the stability improves for higher output versions and so the suggested minimum
output capacitor value, if low ESR ceramic type is used, is 1µF for output voltages equal or major than
3.8V, 2.2µF for output voltages from 2.85 to 3.3V, and 3.3µF for the other versions. However, if an output
capacitor lower than the suggested one is used, it’s possible to make stable the regulator adding a resistor
in series to the capacitor (see Figure1 & Figure2 to choose the right value according to the used version
and keeping in account that the ESR of ceramic capacitors has been measured @ 100KHz).
IMPORTANT
The output capacitor must maintain its ESR in the stable region over the full operating temperature to
assure stability. Also, capacitor tolerance and variation with temperature must be considered to assure
the minimum amount of capacitance is provided at all times. This capacitor should be located not more
than 0.5" from the output pin of the device and returned to a clean analog ground.
INHIBIT INPUT OPERATION
The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current
consumption down to less than 1µA. When the inhibit feature is not used, this pin must be tied to VI to
keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the
inhibit pin must be able to swing above and below the specified thresholds listed in the electrical
characteristics section under VIH VIL. Any slew rate can beusedto drive theinhibit.
REVERSE CURRENT
The power transistor used in the LD2980 has not an inherent diode connected between the regulator input
and output. If the output is forced above the input, no current will flow from the output to the input across
the series pass transistor. When a VREV voltage is applied on the output, the reverse current measured,
according to the test circuit in figure 19, flows to the GND across the two feedback resistors. This current
typical value is 160µA. R1 and R2 resistors are implanted type; typical values are, respectively, 42.6 KΩ
and 51.150 K
Ω.


类似零件编号 - LD2980CU25TR

制造商部件名数据表功能描述
logo
STMicroelectronics
LD2980CU18TR STMICROELECTRONICS-LD2980CU18TR Datasheet
429Kb / 23P
   Ultra low drop voltage regulators compatible with low ESR inhibit output capacitors
LD2980CU30TR STMICROELECTRONICS-LD2980CU30TR Datasheet
429Kb / 23P
   Ultra low drop voltage regulators compatible with low ESR inhibit output capacitors
LD2980CU36TR STMICROELECTRONICS-LD2980CU36TR Datasheet
429Kb / 23P
   Ultra low drop voltage regulators compatible with low ESR inhibit output capacitors
More results

类似说明 - LD2980CU25TR

制造商部件名数据表功能描述
logo
STMicroelectronics
LD2980ABXX STMICROELECTRONICS-LD2980ABXX Datasheet
429Kb / 23P
   Ultra low drop voltage regulators compatible with low ESR inhibit output capacitors
LD2981ABXX STMICROELECTRONICS-LD2981ABXX Datasheet
430Kb / 23P
   Ultra low drop voltage regulators with inhibit low ESR output capacitors compatible
LF00 STMICROELECTRONICS-LF00 Datasheet
649Kb / 34P
   VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT
LF00AB STMICROELECTRONICS-LF00AB Datasheet
260Kb / 32P
   VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT
LEXXAB STMICROELECTRONICS-LEXXAB Datasheet
912Kb / 39P
   Very low drop voltage regulators with inhibit
July 2008 Rev 12
LF00 STMICROELECTRONICS-LF00_06 Datasheet
598Kb / 46P
   Very low drop voltage regulators with inhibit
L4931 STMICROELECTRONICS-L4931 Datasheet
324Kb / 29P
   VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT
January 2004
KF00 STMICROELECTRONICS-KF00 Datasheet
224Kb / 17P
   VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT
LEXXAB STMICROELECTRONICS-LEXXAB_08 Datasheet
908Kb / 39P
   Very low drop voltage regulators with inhibit
LD2979XX STMICROELECTRONICS-LD2979XX Datasheet
298Kb / 15P
   Very low drop voltage regulators with inhibit
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
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