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Semtech Corporation
Semtech Corporation

SC4520 Datasheet Preview

SC4520 Datasheet

3A Step-Down Switching Regulator

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SC4520 pdf
SC4520
3A Step-Down Switching Regulator with
Adjustable Switching Frequency
POWER MANAGEMENT
Description
Features
The SC4520 is a current mode switching regulator with
an integrated switch and an adjustable frequency with
enable function. The integrated switch allows for cost-
effective, low power solutions with a peak switch current
of 3 amps. An adjustable high frequency of 100kHz to
600kHz provides for fast dynamic response and
instantaneous duty cycle adjustment as the input varies,
making the device ideal for CPE applications where the
input is a wall plug power. Low shutdown current also
www.DatamShaekete4sU.ctohme this device an excellent choice for portable
applications where conserving battery life is of prime
concern.
‹ Wide operating voltage range: 4.4V to 24V
‹ Integrated 3 Amp switch
‹ 100kHz to 600kHz adjustable frequency operation
‹ Current mode control
‹ Precision enable threshold
‹ SO-8 EDP package. Lead-free product, fully WEEE
and RoHS compliant
Applications
‹ XDSL modems
‹ CPE equipment
‹ DC-DC point of load applications
‹ Portable equipment
‹ Digtial consumer electronics
Typical Application Circuit
D1
VIN
Enable
C3
2
IN
1
BST
3
SW
5
EN
SC4520
6
FB
8
FSET
Rosc
GND
4
7
COMP
C4
R3
C1
L1
D2
VOUT
R1
C2
R2
Revision: December 13, 2006
1
www.semtech.com



Semtech Corporation
Semtech Corporation

SC4520 Datasheet Preview

SC4520 Datasheet

3A Step-Down Switching Regulator

No Preview Available !

SC4520 pdf
SC4520
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may
affect device reliability.
Parameter
Symbol
Limits
Units
Input Supply Voltage
Boost Pin Above VSW
Boost Pin Voltage
EN Pin Voltage
www.DataSheet4U.com
FB Pin Voltage
FB Pin Current
FSET Pin Voltage
Thermal Impedance Junction to Ambient (1)
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
ESD Rating (Human Body Model)
Note: (1) Minimum pad size.
VIN
(VBST - VSW)
VBST
VEN
VFB
IFB
VFSET
θJA
TJ
TSTG
TLEAD
ESD
-0.3 to +28
16
-0.3 to +32
-0.3 to +24
-0.3 to +6
1
+3
36.5
150
-65 to +150
300
2
V
V
V
V
V
mA
V
°C/W
°C
°C
°C
kV
Electrical Characteristics
Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = tied to VIN, SW = open.
TA = TJ = -40°C to 125°C.
Parameter
Symbol
Conditions
Min Typ Max Units
Operating Input Voltage
Maximum Switch Current Limit
Oscillator Frequency
Oscillator Frequency Range
Switch On Voltage Drop
VIN Undervoltage Lockout
VIN UVLO Hysteresis
VIN Supply Current
Standby Current
VIN
ISW
fOSC
fOSC
VD(SW)
VUVLO
VHYST
IQ
IQ(OFF)
ROSC = 82.5k
ISW = 3A
VFB = 1V
VEN = 0V
24(1)
3.0
250 300 350
100 600
220
3.9 4.4
60
3 5.5
250
V
A
kHz
kHz
mV
V
mV
mA
µA
2006 Semtech Corp.
2
www.semtech.com


Part Number SC4520
Description 3A Step-Down Switching Regulator
Manufacturer Semtech Corporation
Total Page 12 Pages
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