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LT1123CZ

Description
Low Dropout Regulator Driver
CategoryPower/power management    The power supply circuit   
File Size156KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LT1123CZ Overview

Low Dropout Regulator Driver

LT1123CZ Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeTO-92
package instructionTO-92,
Contacts3
Manufacturer packaging codeZ
Reach Compliance Code_compli
ECCN codeEAR99
Maximum drop-back voltage 10.75 V
Maximum input voltage7.2 V
Minimum input voltage5.4 V
JESD-30 codeO-PBCY-T3
JESD-609 codee0
Humidity sensitivity level1
Number of functions1
Number of terminals3
Working temperatureTJ-Max125 °C
Operating temperatureTJ-Mi
Maximum output current 14 A
Maximum output voltage 15.05 V
Minimum output voltage 14.95 V
Nominal output voltage 15 V
Package body materialPLASTIC/EPOXY
encapsulated codeTO-92
Package shapeROUND
Package formCYLINDRICAL
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Regulator typeFIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
surface mountNO
technologyBIPOLAR
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal locationBOTTOM
Maximum time at peak reflow temperature20
LT1123
Low Dropout
Regulator Driver
FEATURES
DESCRIPTIO
Extremely Low Dropout
Low Cost
Fixed 5V Output, Trimmed to
±1%
700µA Quiescent Current
1mV Line Regulation
5mV Load Regulation
Thermal Limit
4A Output Current Guaranteed
Available in a 3-Pin TO-92 Package
The LT
®
1123 is a 3-pin bipolar device designed to be used
in conjunction with a discrete PNP power transistor to
form an inexpensive low dropout regulator. The LT1123
consists of a trimmed bandgap reference, error amplifier,
and a driver circuit capable of sinking up to 125mA from
the base of the external PNP pass transistor. The LT1123
is designed to provide a fixed output voltage of 5V.
The drive pin of the device can pull down to 2V at 125mA
(1.4V at 10mA). This allows a resistor to be used to reduce
the base drive available to the PNP and minimize the
power dissipation in the LT1123. The drive current of the
LT1123 is folded back as the feedback pin approaches
ground to further limit the available drive current under
short-circuit conditions.
Total quiescent current for the LT1123 is only 700µA. The
device is available in a low cost TO-92 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
5V Low Dropout Regulator
0.5
SEALED
LEAD ACID
5.4 TO 7.2V
+
10µF*
620Ω
20Ω
DRIVE
*REQUIRED IF DEVICE IS
MORE THAN 6" FROM MAIN
FILTER CAPACITOR
DROPOUT VOLTAGE (V)
MOTOROLA
MJE1123
0.4
0.3
LT1123 FB
OUTPUT = 5V/4A
0.2
+
GND
REQUIRED FOR STABILITY
(LARGER VALUES INCREASE
STABILITY)
10µF
LT1123 TA01
0.1
0
0
1
U
Dropout Voltage
3
4
2
OUTPUT CURRENT (A)
5
LT1123 TA02
U
1123fb
1

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