Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LT1175IQ-5 Datasheet(PDF) 8 Page - Linear Technology

Part # LT1175IQ-5
Description  500mA Negative Low Dropout Micropower Regulator
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1175IQ-5 Datasheet(HTML) 8 Page - Linear Technology

Back Button LT1175IQ-5 Datasheet HTML 4Page - Linear Technology LT1175IQ-5 Datasheet HTML 5Page - Linear Technology LT1175IQ-5 Datasheet HTML 6Page - Linear Technology LT1175IQ-5 Datasheet HTML 7Page - Linear Technology LT1175IQ-5 Datasheet HTML 8Page - Linear Technology LT1175IQ-5 Datasheet HTML 9Page - Linear Technology LT1175IQ-5 Datasheet HTML 10Page - Linear Technology LT1175IQ-5 Datasheet HTML 11Page - Linear Technology LT1175IQ-5 Datasheet HTML 12Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 16 page
background image
8
LT1175
1175fd
APPLICATIONS INFORMATION
LT1175
A1
3.8V
R1
ESR
OUTPUT
1175 F03
COUT
OUT
GND
SENSE
R2
RC
0.5Ω
RLIM
RN
CF
20pF
+
PARASITIC
COLLECTOR
RESISTANCE
POWER
TRANSISTOR
NEGATIVE DC
FEEDBACK
AT LIGHT
LOADS
AC
FEEDFORWARD
PATH
CURRENT LIMIT
SENSE RESISTOR
Q2
Q1
–VIN
LOAD
Q3
0.3Ω. This condition can occur with ceramic or film
capacitors which often have an ESR under 0.1Ω. With
previous designs, the user was forced to add a real resistor
in series with the capacitor to guarantee loop stability. The
LT1175 uses a unique AC feedforward technique to elimi-
nate this problem. CF is a conventional feedforward ca-
pacitor often used in regulators to cancel the pole formed
by the output capacitor. It would normally be connected
from the regulated output node to the feedback node at the
R1/R2 junction or to an internal node on the amplifier as
shown. In this case, however, the capacitor is connected
to the internal structure of the power transistor. RC is the
unavoidable parasitic collector resistance of the power
transistor. Access to the node at the bottom of RC is
available only in monolithic structures where Kelvin con-
nections can be made to the NPN buried collector layer.
The loop now responds as if RC were in series with the
output capacitor and good loop stability is achieved even
with extremely low ESR in the output capacitor.
The end result of all this attention to loop stability is that
the output capacitor used with the LT1175 can range in
value from 0.1µF to hundreds of microfarads, with an ESR
from 0Ω to 10Ω. This range allows the use of ceramic,
solid tantalum, aluminum and film capacitors over a wide
range of values.
The optimum output capacitor type for the LT1175 is still
solid tantalum, but there is considerable leeway in select-
ing the exact unit. If large load current transients are
expected, larger capacitors with lower ESR may be needed
to control worst-case output variation during transients. If
transients are not an issue, the capacitor can be chosen for
small physical size, low price, etc. Concerns about surge
currents in tantalum capacitors are not an issue for the
output capacitor because the LT1175 limits inrush current
to well below the level which can cause capacitor damage.
Surges caused by shorting the regulator output are also
not a problem because tantalum capacitors do not fail
Figure 3


Similar Part No. - LT1175IQ-5

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LT1175IQ-5 LINER-LT1175IQ-5 Datasheet
120Kb / 12P
   500mA Negative Low Dropout Micropower Regulator
LT1175IQ-5 LINER-LT1175IQ-5 Datasheet
312Kb / 18P
   500mA Negative Low Dropout Micropower Regulator
LT1175IQ-5-PBF LINER-LT1175IQ-5-PBF Datasheet
312Kb / 18P
   500mA Negative Low Dropout Micropower Regulator
LT1175IQ-5-TR LINER-LT1175IQ-5-TR Datasheet
312Kb / 18P
   500mA Negative Low Dropout Micropower Regulator
LT1175IQ-5-TRPBF LINER-LT1175IQ-5-TRPBF Datasheet
312Kb / 18P
   500mA Negative Low Dropout Micropower Regulator
More results

Similar Description - LT1175IQ-5

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LT1175 LINER-LT1175_10 Datasheet
312Kb / 18P
   500mA Negative Low Dropout Micropower Regulator
logo
Linear Dimensions Semic...
LT1175CS8PBF LINEAR_DIMENSIONS-LT1175CS8PBF Datasheet
221Kb / 20P
   500mA Negative Low Dropout Micropower Regulator
logo
Linear Technology
LT1175 LINER-LT1175 Datasheet
120Kb / 12P
   500mA Negative Low Dropout Micropower Regulator
LT1175 LINER-LT1175_15 Datasheet
221Kb / 20P
   500mA Negative Low Dropout Micropower Regulator
LT3029 LINER-LT3029_11 Datasheet
338Kb / 20P
   Dual 500mA/500mA Low Dropout, Low Noise, Micropower Linear Regulator
LT3029 LINER-LT3029 Datasheet
1Mb / 20P
   Dual 500mA/500mA Low Dropout, Low Noise, Micropower Linear Regulator
LT3029 LINER-LT3029_15 Datasheet
1Mb / 20P
   Dual 500mA/500mA Low Dropout, Low Noise, Micropower Linear Regulator
LT1964 LINER-LT1964 Datasheet
193Kb / 12P
   Low Dropout Negative Micropower Regulator in ThinSOT
LT1964 LINER-LT1964_15 Datasheet
229Kb / 16P
   200mA, Low Noise, Low Dropout Negative Micropower Regulator
LT1964 LINER-LT1964_1 Datasheet
222Kb / 16P
   200mA, Low Noise,Low Dropout Negative Micropower Regulator
More results


Html Pages

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


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