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TJ4519 반도체 회로 부품 판매점

600kHz 3A Step-Down Switching Regulator



HTC Korea 로고
HTC Korea
TJ4519 데이터시트, 핀배열, 회로
600kHz 3A Step-Down Switching Regulator
TJ4519
FEATURES
z Integrated 3 Amp switch
z 600kHz frequency of operation
z Current mode controller
z Precision enable threshold
z Available in SOP8-PP Package
SOP8-PP PKG
APPLICATION
z XDSL Modems
z CPE equipment
z DC-DC point of load applications
z Portable equipment
ORDERING INFORMATION
Device (Marking)
TJ4519DP
Package
SOP8-PP
DESCRIPSION
The TJ4519 is a current mode switching regulator with an integrated switch, operating at 600kHz with enable
functions. The integrated switch allows for cost effective low power solutions (peak switch current 3 amps).
High frequency of operation allows for very small passive components. Current mode operation allows for fast
dynamic response and instantaneous duty cycle adjustment as the input varies (ideal for CPE applications
where the input is a wall plug power). The low shutdown current makes it ideal for portable applications where
battery life is important.
Absolute Maximum Ratings
CHARACTERISTIC
SYMBOL
MIN.
MAX.
Input Supply Voltage
VIN -0.3 28
Boost Pin Above VSW
VBST - VSW
-
16
Boost Pin Voltage
VBST
-0.3 32
EN Pin Voltage
VEN -0.3 24
FB Pin Voltage
VFB -0.3 6
FB Pin Current
IFB - 1
Operating Ambient Temperature Range
TA -40 85
Operating Junction Temperature Range
TJ -40 150
Storage Temperature Range
TSTG
-65 150
Lead Temperature (Soldering) 5 sec
TSOL
- 260
(1) For proper operation of device, VIN should be within Max. Operating Input Voltage as defined in Electrical Characteristics.
UNIT
V
V
V
V
V
mA
Ordering Information
Order No.
Package
TJ4519DP-8L
SOP8-PP
Description
600kHz 3A Step-Down Regulator
Package Marking Supplied As
TJ4519
Reel
Jul. 2010 – Preliminary
-1-
HTC
Free Datasheet http://www.datasheet4u.com/


TJ4519 데이터시트, 핀배열, 회로
600kHz 3A Step-Down Switching Regulator
PIN CONFIGURATION
BST 1
IN 2
SW 3
GND 4
8 N.C
7 COMP
6 FB
5 EN
TJ4519
PIN DESCRIPTION
SOP8-PP (With Exposed PAD)
Pin No.
Pin Name
Pin Description
1
BST
Provides power to the internal NPN switch. The minimum turn on
voltage for this switch is 2.7V.
Pin IN delivers all power required by control and power circuitry. This
2 IN pin sees high di/dt during switching. A decoupling capacitor should be
attached to this pin as close as possible.
3
SW
Pin SW is the emitter of the internal switch. The external freewheeling
diode should be connected as close as possible to this pin.
Ground. All voltages are measured with respect to this pin. The
4
GND
decoupling capacitor and the freewheeling diode should be connected
to GND as short as possible.
This is the chip enable input. The regulator is switched on if EN is high,
5 EN and it is off if EN is low. The regulator is in standby mode when EN is
low, and the input supply current is reduced to a few microamperes.
6 FB Feedback input for adjustable output controllers.
The output of the internal error amplifier and input of the peak current
7
COMP
comparator. A compensation network is connected to this pin to achieve
the specified performance.
8 N.C Not Connect.
-
Exposed Thermal PAD
Pad for heat sinking purposes. Connect to ground plane using multiple
vias. Not connected internally.
Jul. 2010 – Preliminary
-2-
HTC
Free Datasheet http://www.datasheet4u.com/




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TJ4519 regulator

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600kHz 3A Step-Down Switching Regulator - HTC Korea