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PDF ( 数据手册 , 数据表 ) TJ4940

零件编号 TJ4940
描述 1A Ultra Low Dropout Linear Regulator
制造商 HTC Korea
LOGO HTC Korea LOGO 


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TJ4940 数据手册, 描述, 功能
1A Ultra Low Dropout Linear Regulator
TJ4940
FEATURES
Ultra Low Dropout Voltage
Compatible with low ESR MLCC as Input/Output Capacitor
Good Line and Load Regulation
Guaranteed Output Current of 1A
Available in SOT-223 and TO-252 Packages
Fixed Output Voltages : 1.0V, 1.2V, 1.8V, 2.5V, and 3.3V
Over-Temperature/Over-Current Protection
-40 ºC to 125 ºC Junction Temperature Range
APPLICATION
LCD TVs and SETTOP Boxes
Battery Powered Equipments
Motherboards and Graphic Cards
Microprocessor Power Supplies
Peripheral Cards
High Efficiency Linear Regulators
Battery Chargers
DESCRIPTION
The TJ4940 series of high performance ultra-low dropout
linear regulators operates from 2.5V to 6V input supply and
provides ultra-low dropout voltage, high output current with
low ground current. Wide range of preset output voltage
options are available. These ultra-low dropout linear
regulators respond fast to step changes in load which
makes them suitable for low voltage micro-processor
applications. The TJ4940 is developed on a CMOS process
technology which allows low quiescent current operation
independent of output load current. This CMOS process
also allows the TJ4940 to operate under extremely low
dropout conditions.
SOT-223 3L
TO252 3L PKG
ORDERING INFORMATION
Device
Package
TJ4940xS-X.X
SOT-223 3L
TJ4940GRS-X.X
TO-252 3L
X.X = Output Voltage = 1.0, 1.2, 1.8, 2.5, and 3.3
Absolute Maximum Ratings
CHARACTERISTIC
SYMBOL
MIN.
MAX.
UNIT
Input Supply Voltage (Survival)
Maximum Output Current
Lead Temperature (Soldering, 5 sec)
Storage Temperature Range
Operating Junction Temperature Range
VIN
IMAX
TSOL
TSTG
TJOPR
- 6.5 V
- 1A
260 ºC
-65 150 ºC
-40 125 ºC
* Calculated from package in still air, mounted to 2.6mm X 3.5mm(minimum foot print) 2 layer PCB without thermal vias per JESD51 standards.
Jul. 2011 – Preliminary
1/8 HTC
Free Datasheet http://www.datasheet4u.com/







TJ4940 pdf, 数据表
1A Ultra Low Dropout Linear Regulator
TJ4940
The maximum allowable power dissipation is also influenced by the ambient temperature. With the
above θJA-Copper plane area relationship, the maximum allowable power dissipation could be evaluated
with respect to the ambient temperature. As shown in graph, the higher copper plane area leads θJA.
And the higher ambient temperature leads lower maximum allowable power dissipation.
All this relationship is based on the aforesaid equation ; θJA = TRmax / PD = (TJmax – TAmax) / PD.
T.B.D
Jul. 2011 – Preliminary
8/8 HTC
Free Datasheet http://www.datasheet4u.com/














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