Datenblatt-pdf.com


TJ4230 Schematic ( PDF Datasheet ) - HTC Korea

Teilenummer TJ4230
Beschreibung 3A Ultra Low Dropout Linear Regulator
Hersteller HTC Korea
Logo HTC Korea Logo 




Gesamt 9 Seiten
TJ4230 Datasheet, Funktion
3A Ultra Low Dropout Linear Regulator
TJ4230
FEATURES
Ultra Low Dropout Voltage
Compatible with low ESR MLCC as Input/Output Capacitor
Good Line and Load Regulation
Guaranteed Output Current of 3A
Available in SOP8-PP, 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
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 TJ4230 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 TJ4230 is developed on a CMOS process
technology which allows low quiescent current operation
independent of output load current. This CMOS process
also allows the TJ4230 to operate under extremely low
dropout conditions.
SOP8-PP
TO-252 3L / 5L PKG
TO-263 3L / 5L PKG
ORDERING INFORMATION
Device
Package
TJ4230GDP-ADJ
TJ4230GDP-X.X
SOP8-PP
TJ4230GRS-ADJ
TJ4230GRS-X.X
TO-252 3L/5L
TJ4230GR-ADJ
TJ4230GR-X.X
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
-3
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.
Apr. 2011 – Rev. 1. 0
1/9
HTC
Free Datasheet http://www.datasheet4u.com/






TJ4230 Datasheet, Funktion
3A Ultra Low Dropout Linear Regulator
APPLICATION INFORMATION
TJ4230
Introduction
TJ4230 is intended for applications where high current capability and very low dropout voltage are required. It
provides a simple, low cost solution that occupies very little PCB estate. Additional features include an enable
pin to allow for a very low power consumption standby mode, an adjustable pin to provide a fully adjustable
output voltage, and SENSE pin to provide better remote load regulation characteristics.
Component Selection
Input Capacitor :
A large bulk capacitance over than 10uF should be closely placed to the input supply pin of the TJ4230 to
ensure that the input supply voltage does not sag. Also a minimum of 10uF ceramic capacitor is
recommended to be placed directly next to the VIN Pin. It allows for the device being some distance from any
bulk capacitor on the rail. Additionally, input droop due to load transients is reduced, improving load transient
response. Additional capacitance may be added if required by the application.(See Fig.1)
Output Capacitor :
A minimum ceramic capacitor over than 10uF should be very closely placed to the output voltage pin of the
TJ4230. Increasing capacitance will improve the overall transient response and stability.
Decoupling (Bypass) Capacitor :
In very electrically noisy environments, it is recommended that additional ceramic capacitors be placed from
VIN to GND. The use of multiple lower value ceramic capacitors in parallel with output capacitor also allows to
achieve better transient performance and stability if required by the application.(See Fig.1)
Feed-Forward Capacitor
To get the higher PSRR than the inherent performance of TJ4230, it is recommended that additional ceramic
feed-forward capacitor be placed from VOUT pin to ADJ pin. The capacitance of feed-forward capacitor with
range of 10pF to 1uF allows to achieve better PSRR performance when required by the application.(See
Fig.2)
VIN
CIN
10uF
CC1
VIN
RP
EN
VOUT
TJ4230
GND SENSE
COUT
10uF
VOUT
VIN
CC2
CIN
10uF
CC1
VIN
RP
EN
VOUT
TJ4230
CFF
GND ADJ
R2
COUT
10uF
R1
VOUT
CC2
Fig. 1. Application with Decoupling Capacitor,
CC1 & CC2
Fig. 2. Application with Feed-Forward Capacitor,
CFF
Delayed Start-Up
When power sequence control is required or rising time of input supply voltage is over than 100usec, it is
recommended to apply delayed start-up by using Cdelay as shown in Fig. 3. It can adjust proper delay by
Rp-Cdelay time constant. And also it can prevent any unexpected transient characteristics at output voltage
when the rising time of input supply voltage is as long as 100usec or longer.
VIN
CIN
10uF
VIN
RP
EN
Cdelay
VOUT
TJ4230
CFF
GND ADJ
VOUT
R2
COUT
10uF
R1
Apr. 2011 – Rev. 1. 0
Fig. 3. Application with Delayed Start-Up
6/9
HTC
Free Datasheet http://www.datasheet4u.com/

6 Page







SeitenGesamt 9 Seiten
PDF Download[ TJ4230 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
TJ42303A Ultra Low Dropout Linear RegulatorHTC Korea
HTC Korea

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche