SC4520 PDF даташит
Спецификация SC4520 изготовлена «Semtech Corporation» и имеет функцию, называемую «3A Step-Down Switching Regulator». |
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Детали детали
Номер произв | SC4520 |
Описание | 3A Step-Down Switching Regulator |
Производители | Semtech Corporation |
логотип |
12 Pages
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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
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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
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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 Ω
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.
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SC4520
POWER MANAGEMENT
Electrical Characteristics (Cont.)
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
FB Input Current
Feedback Voltage
IFB
Feedback Voltage Line
Regulation
4.4V < VIN < 24V(1)
www.DataSFheBett4oU.VcoCmOMP Voltage Gain(2)
FB to VCOMP
Transconductance(2)
0.9V ≤ VCOMP ≤ 2.0V
∆ ICOMP = ± 10µA
VCOMP Pin Source Current
VCOMP Pin Sink Current
VCOMP Pin to Switch Current
Transconductance
VFB = 0.6V
VFB = 1.0V
VCOMP = 1.25V
VCOMP Pin Maximum
Switching Threshold
Duty cycle = 0%
VCOMP OCP Threshold
VCOMP Hiccup Retry Threshold
Maximum Switch Duty Cycle
VCOMP rising
VCOMP falling
VCOMP = 1.2V, ISW = 400mA,
ROSC = 0
MIN
0.784
TYP
-0.25
0.8
+3
MAX
-1
0.816
UNITS
µA
V
mV/V
150 350
V/V
500 850 1300 µMho
70 110 µA
-70 -110
µA
4.3 A/V
0.6 V
2
0.25
85
V
V
%
Minimum Boost Voltage
Above Switch(2)
2.7
Boost Current
Enable Input Threshold
Voltage
VETH
ISW = 1A
ISW = 3A
10 15
30 45
1.1 1.3 1.5
Enable Output Bias Current
IEOL
EN = 50mV below threshold
8
IEOH EN = 50mV below threshold
10
Notes:
(1) The required minimum input voltage for a regulated output depends on the output voltage and load condition.
(2) Guaranteed by design.
V
mA
V
µA
µA
2006 Semtech Corp.
3
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