Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

ADP122AUJZ-2.9-R7 Datenblatt(PDF) 11 Page - Analog Devices

Teilenummer ADP122AUJZ-2.9-R7
Bauteilbeschribung  5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP122AUJZ-2.9-R7 Datenblatt(HTML) 11 Page - Analog Devices

Back Button ADP122AUJZ-2.9-R7 Datasheet HTML 7Page - Analog Devices ADP122AUJZ-2.9-R7 Datasheet HTML 8Page - Analog Devices ADP122AUJZ-2.9-R7 Datasheet HTML 9Page - Analog Devices ADP122AUJZ-2.9-R7 Datasheet HTML 10Page - Analog Devices ADP122AUJZ-2.9-R7 Datasheet HTML 11Page - Analog Devices ADP122AUJZ-2.9-R7 Datasheet HTML 12Page - Analog Devices ADP122AUJZ-2.9-R7 Datasheet HTML 13Page - Analog Devices ADP122AUJZ-2.9-R7 Datasheet HTML 14Page - Analog Devices ADP122AUJZ-2.9-R7 Datasheet HTML 15Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 24 page
background image
Data Sheet
ADP122/ADP123
Rev. E | Page 11 of 24
THEORY OF OPERATION
The ADP122/ADP123 are low quiescent current, low-dropout
linear regulators that operate from 2.3 V to 5.5 V and can provide
up to 300 mA of output current. Drawing a low 170 µA of quies-
cent current (typical) at full load makes the ADP122/ADP123
ideal for battery-operated portable equipment. Shutdown current
consumption is typically 100 nA.
Optimized for use with small 1 µF ceramic capacitors, the
ADP122/ADP123 provide excellent transient performance.
Internally, the ADP122/ADP123 consist of a reference, an error
amplifier, a feedback voltage divider, and a PMOS pass transistor.
Output current is delivered via the PMOS pass device, which is
controlled by the error amplifier. The error amplifier compares
the reference voltage with the feedback voltage from the output
and amplifies the difference. If the feedback voltage is lower than
the reference voltage, the gate of the PMOS device is pulled lower,
allowing more current to pass and increasing the output voltage.
If the feedback voltage is higher than the reference voltage, the
gate of the PMOS device is pulled higher, allowing less current
to pass and decreasing the output voltage.
The adjustable ADP123 has an output voltage range of 0.8 V to
5.0 V. The output voltage is set by the ratio of two external resistors,
as shown in Figure 2. The device servos the output to maintain
the voltage at the ADJ pin at 0.5 V referenced to ground. The
current in R1 is then equal to 0.5 V/R2 and the current in R1 is
the current in R2 plus the ADJ pin bias current. The ADJ pin
bias current, 15 nA at 25°C, flows through R1 into the ADJ pin.
The output voltage can be calculated using the equation:
VOUT = 0.5 V(1 + R1/R2) + (ADJI-BIAS)(R1)
The value of R1 should be less than 200 kΩ to minimize errors
in the output voltage caused by the ADJ pin bias current. For
example, when R1 and R2 each equal 200 kΩ, the output voltage
is 1.0 V. The output voltage error introduced by the ADJ pin
bias current is 3 mV or 0.3%, assuming a typical ADJ pin bias
current of 15 nA at 25°C.
Note that in shutdown, the output is turned off and the divider
current is 0.
The ADP122/ADP123 use the EN pin to enable and disable the
VOUT pin under normal operating conditions. When EN is high,
VOUT turns on; when EN is low, VOUT turns off. For automatic
startup, EN can be tied to VIN.
SHORT CIRCUIT,
UVLO AND
THERMAL
PROTECT
0.5V REFERENCE
ADP122
SHUTDOWN
VIN
VOUT
R1
R2
GND
NOTES
1. R1 AND R2 ARE INTERNAL RESISTORS, AVAILABLE ON
THE ADP122 ONLY.
EN
Figure 30. ADP122 Internal Block Diagram (Fixed Output)
SHORT CIRCUIT,
UVLO AND
THERMAL
PROTECT
0.5V REFERENCE
SHUTDOWN
VIN
VOUT
GND
EN
ADJ
ADP123
Figure 31. ADP123 Internal Block Diagram (Adjustable Output)


Ähnliche Teilenummer - ADP122AUJZ-2.9-R7

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Analog Devices
ADP122AUJZ-2.9-R7 AD-ADP122AUJZ-2.9-R7 Datasheet
616Kb / 20P
   5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator
REV. 0
ADP122AUJZ-2.9-R7 AD-ADP122AUJZ-2.9-R7 Datasheet
611Kb / 24P
   5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator
Rev. E
More results

Ähnliche Beschreibung - ADP122AUJZ-2.9-R7

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Analog Devices
ADP122ACPZ-2.6-R7 AD-ADP122ACPZ-2.6-R7 Datasheet
611Kb / 24P
   5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator
Rev. E
ADP122 AD-ADP122 Datasheet
616Kb / 20P
   5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator
REV. 0
ADP172 AD-ADP172_V01 Datasheet
2Mb / 17P
   300 mA, Low Quiescent Current, CMOS Linear Regulator
Rev. F
ADP172 AD-ADP172_10 Datasheet
579Kb / 20P
   300 mA, Low Quiescent Current, CMOS Linear Regulator
REV. 0
ADP172_101 AD-ADP172_101 Datasheet
586Kb / 20P
   300 mA, Low Quiescent Current CMOS Linear Regulator
REV. B
ADP124ACPZ-1.8-R7 AD-ADP124ACPZ-1.8-R7 Datasheet
632Kb / 20P
   5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators
REV. C
ADP124 AD-ADP124 Datasheet
676Kb / 20P
   5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators
REV. 0
ADP125ACPZ-R7 AD-ADP125ACPZ-R7 Datasheet
632Kb / 20P
   5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators
REV. C
ADP170 AD-ADP170 Datasheet
538Kb / 20P
   300 mA, Low Quiescent Current, CMOS Linear Regulators
REV. B
ADP121-AUJZ12R7 AD-ADP121-AUJZ12R7 Datasheet
667Kb / 20P
   150 mA, Low Quiescent Current, CMOS Linear Regulator
Rev. G
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
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