Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

RT9182 Datasheet(PDF) 8 Page - Richtek Technology Corporation

Part # RT9182
Description  Dual, Low-Noise, 200mA LDO Regulator
Download  9 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9182 Datasheet(HTML) 8 Page - Richtek Technology Corporation

  RT9182_07 Datasheet HTML 1Page - Richtek Technology Corporation RT9182_07 Datasheet HTML 2Page - Richtek Technology Corporation RT9182_07 Datasheet HTML 3Page - Richtek Technology Corporation RT9182_07 Datasheet HTML 4Page - Richtek Technology Corporation RT9182_07 Datasheet HTML 5Page - Richtek Technology Corporation RT9182_07 Datasheet HTML 6Page - Richtek Technology Corporation RT9182_07 Datasheet HTML 7Page - Richtek Technology Corporation RT9182_07 Datasheet HTML 8Page - Richtek Technology Corporation RT9182_07 Datasheet HTML 9Page - Richtek Technology Corporation  
Zoom Inzoom in Zoom Outzoom out
 8 / 9 page
background image
RT9182
8
DS9182-17
March 2007
www.richtek.com
of larger capacitance can reduce noise and improve load-
transient response, stability, and PSRR. The output
capacitor should be located not more than 0.5" from the
VOUT pin of the RT9182 and returned to a clean analog
ground.
Note that some ceramic dielectrics exhibit large
capacitance and ESR variation with temperature. It may
be necessary to use 2.2
μF or more to ensure stability at
temperatures below -10
°C in this case. Also, tantalum
capacitors, 2.2
μF or more may be needed to maintain
capacitance and ESR in the stable region for strict
application environment.
Tantalum capacitors maybe suffer failure due to surge
current when it is connected to a low-impedance source
of power (like a battery or very large capacitor). If a
tantalum capacitor is used at the input, it must be
guaranteed to have a surge current rating sufficient for
the application by the manufacture.
Load-Transient Considerations
The RT9182 load-transient response graphs show two
components of the output response: a DC shift from the
output impedance due to the load current change, and
the transient response. The DC shift is quite small due
to the excellent load regulation of the IC. Typical output
voltage transient spike for a step change in the load
current from 0mA to 50mA is tens mV, depending on the
ESR of the output capacitor. Increasing the output
capacitor's value and decreasing the ESR attenuates the
overshoot.
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential
(or dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this will determine
the useful end-of-life battery voltage. Because the
RT9182 uses a P-Channel MOSFET pass transistor, the
dropout voltage is a function of drain-to-source on-
resistance [RDS(ON)] multiplied by the load current.
Reverse Current Path
The power transistor used in the RT9182 has an inherent
diode connected between each regulator input and output
(see Figure2). If the output is forced above the input by
more than a diode-drop, this diode will become forward
biased and current will flow from the VOUT terminal to
VIN. This diode will also be turned on by abruptly stepping
the input voltage to a value below the output voltage. To
prevent regulator mis-operation, a Schottky diode could
be used in the applications where input/output voltage
conditions can cause the internal diode to be turned on
(see Figure3). As shown, the Schottky diode is connected
in parallel with the internal parasitic diode and prevents
it from being turned on by limiting the voltage drop across
it to about 0.3V < 100mA to prevent damage to the part.
VIN
VOUT
VIN
VOUT
Figure 2
Figure 3
Figure 1
Region of Stable Cout ESR v.s Load Current
0.001
0.01
0.1
1
10
100
0
40
80
120
160
200
Load Current (mA)
COUT = 1uF
COUT = 4.7uF
Instable
Instable
Stable


Similar Part No. - RT9182_07

ManufacturerPart #DatasheetDescription
logo
Richtek Technology Corp...
RT9182 RICHTEK-RT9182_08 Datasheet
112Kb / 9P
   Dual, Low-Noise, 200mA LDO Regulator
More results

Similar Description - RT9182_07

ManufacturerPart #DatasheetDescription
logo
Richtek Technology Corp...
RT9182 RICHTEK-RT9182_08 Datasheet
112Kb / 9P
   Dual, Low-Noise, 200mA LDO Regulator
RT9182 RICHTEK-RT9182 Datasheet
212Kb / 10P
   DUAL, LOW-NOISE, 200mA LDO REGULATOR
logo
Unisonic Technologies
LR4XXYY UTC-LR4XXYY Datasheet
178Kb / 7P
   Dual Low-Noise 200mA LDO REGULATOR
LR9200 UTC-LR9200 Datasheet
270Kb / 7P
   LOW NOISE 200mA LDO REGULATOR
LR1122D UTC-LR1122D Datasheet
241Kb / 9P
   LOW NOISE 200mA LDO REGULATOR
logo
RICOH electronics devic...
RP100X RICOH-RP100X Datasheet
1Mb / 28P
   LOW NOISE 200mA LDO REGULATOR
logo
Unisonic Technologies
LR1122D UTC-LR1122D_16 Datasheet
280Kb / 7P
   LOW NOISE 200mA LDO REGULATOR
logo
Lowpower Semiconductor ...
LP3993 POWER-LP3993 Datasheet
306Kb / 7P
   200mA,Ultra-low Noise LDO Regulator
LP3995 POWER-LP3995 Datasheet
542Kb / 9P
   200mA,Ultra-low Noise LDO Regulator
logo
Exar Corporation
SP6260 EXAR-SP6260_11 Datasheet
738Kb / 13P
   200mA RF Low Noise LDO Regulator
More results


Html Pages

1 2 3 4 5 6 7 8 9


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