SC4519 Datasheet PDF - Semtech Corporation
| Part Number | SC4519 | |
| Description | 3A Step-Down Switching Regulator | |
| Manufacturers | Semtech Corporation | |
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POWER MANAGEMENT
Description
The SC4519 is a current mode switching regulator with
an integrated switch, operating at 600kHz with separate
sync and enable functions. The integrated switch allows
for cost effective low power solutions (peak switch current
3 amps). The sync function allows customers to
synchronize to a faster clock in order to avoid frequency
beating in noise sensitive applications. High frequency
of operation allows for very small passive components.
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for fast dynamic
adjustment as
response
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.
SC4519
600kHz, 3A Step-Down
Switching Regulator
Features
Integrated 3 Amp switch
600kHz frequency of operation
Current mode controller
Synchronizable to higher frequency up to 1.2MHz
6µA low shutdown current
SOIC-8L-EDP Lead-free package. This product is
fully WEEE and RoHS compliant
Applications
XDSL modems
CPE equipment
DC-DC point of load applications
Portable equipment
The SC4519 is a 600kHz switching regulator
synchronizable to a faster frequency from 750kHz to
1.2MHz.
Typical Application Circuit
VIN
Enable
C3
D1
2 IN
5 EN
1
BST
SC4519
SW 3
FB 6
8 SYNC
GND
4
COMP 7
C4
C1
L1
D2
R3
VOUT
R1
C2
R2
Revision: April 18, 2007
1
www.semtech.com
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POWER MANAGEMENT
Pin Configurations
TOP VIEW
BST
IN
SW
www.DataSheet4UG.coNmD
1
2
3
4
8 SYNC
7 COMP
6 FB
5 EN
(SOIC-8L-EDP)
SC4519
Ordering Information
Part Number (1)(2)
SC4519STRT
SC4519EVB
Package
SOIC-8L-EDP
Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
(2) Lead free product. This product is WEEE and
RoHS compliant.
Pin Descriptions
Pin # Pin Name Pin Function
1 BST This pin provides power to the internal NPN switch. The minimum turn on voltage for this switch
is 2.7V.
2 IN Pin IN delivers all power required by control and power circuitry. This 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.
4 GND All voltages are measured with respect to this pin. The decoupling capacitor and the freewheeling
diode should be connected to GND as short as possible.
5 EN This is the chip enable input. The regulator is switched on if EN is high, 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.
7 COMP This is the output of the internal error amplifier and input of the peak current comparator. A
compensation network is connected to this pin to achieve the specified performance.
8 SYNC This is synchronous control pin used to synchronize the internal oscillator to an external pulse
control signal. When not used, it should be connected to GND.
- THERMAL Pad for heatsinking purposes. Connect to ground plane using multiple vias. Not connected
PAD internally.
2007 Semtech Corp.
5
www.semtech.com
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for SC4519 electronic component. |
| Information | Total 15 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ SC4519.PDF Datasheet ] | |
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