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PDF ( 数据手册 , 数据表 ) TJ4220

零件编号 TJ4220
描述 2A Ultra Low Dropout Linear Regulator
制造商 HTC Korea
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TJ4220 数据手册, 描述, 功能
2A Ultra Low Dropout Linear Regulator
TJ4220
FEATURES
Ultra Low Dropout Voltage
Compatible with low ESR MLCC as Input/Output Capacitor
Good Line and Load Regulation
Guaranteed Output Current of 2A
Available in SOP8, SOP8-PP, SOT-223 and TO-252
and TO-263 Packages
Fixed Output Voltages : 1.0V, 1.2V, 1.8V, 2.5V, and 3.3V
SENSE Option Improves Load Regulation
Over-Temperature/Over-Current Protection
-40 ºC to 125 ºC Junction Temperature Range
SOP8 / SOP8-PP
SOT-223 3L
TO252 3L / 5L PKG
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 TJ4220 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 TJ4220 is developed on a CMOS process
technology which allows low quiescent current operation
independent of output load current. This CMOS process
also allows the TJ4220 to operate under extremely low
dropout conditions.
TO-263 3L / 5L PKG
ORDERING INFORMATION
Device
TJ4220GD-ADJ
TJ4220GD-X.X
TJ4220GDP-ADJ
TJ4220GDP-X.X
TJ4220xS-ADJ
TJ4220xS-X.X
TJ4220GRS-ADJ
TJ4220GRS-X.X
TJ4220GR-ADJ
TJ4220GR-X.X
Package
SOP8
SOP8-PP
SOT-223 3L/5L
TO-252 3L/5L
TO-263 3L/5L
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)
Enable Input Voltage (Survival)
Maximum Output Current
Lead Temperature (Soldering, 5 sec)
Storage Temperature Range
Operating Junction Temperature Range
Package Thermal Resistance *
VIN
VEN
IMAX
TSOL
TSTG
TJOPR
ΘJA-SOP8-PP
- 6.5
- 6.5
-2
260
-65 150
-40 125
68
V
V
A
ºC
ºC
ºC
ºC/W
* 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.
Jun. 2011 – R1.0.6
1/14
HTC







TJ4220 pdf, 数据表
2A Ultra Low Dropout Linear Regulator
TJ4220
where TJ is the junction temperature, TC is the case temperature, TA is the ambient temperature, PD is the
total power dissipation of the device, θCA is the thermal resistance of case-to-ambient, θJC is the thermal
resistance of junction-to-case, and θJA is the thermal resistance of junction to ambient.
The total power dissipation of the device is given by:
PD = PIN – POUT = (VIN X IIN)–(VOUT X IOUT)
= (VIN X (IOUT+IGND)) – (VOUT X IOUT) = (VIN - VOUT) X IOUT + VIN X IGND
where IGND is the operating ground current of the device which is specified at the Electrical Characteristics.
The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax)
of the application, and the maximum allowable junction temperature (TJmax):
TRmax = TJmax – TAmax
The maximum allowable value for junction-to-ambient thermal resistance, θJA, can be calculated using the
formula:
θJA = TRmax / PD
TJ4220 is available in SOT223, SOP8-PP, TO252 and TO263 packages. The thermal resistance
depends on amount of copper area or heat sink, and on air flow.
If proper cooling solution such as heat sink, copper plane area, or air flow is applied, the maximum
allowable power dissipation could be increased. However, if the ambient temperature is increased, the
allowable power dissipation would be decreased.
The graph above is valid for the thermal impedance specified in the Absolute Maximum Ratings section
on page 1.
Jun. 2011 – R1.0.6
8/14
HTC














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