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SC2440 Datasheet Preview

SC2440 Datasheet

2.5 MHz Dual Switching Regulator

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POWER MANAGEMENT
Description
The SC2440 is an adjustable frequency dual current-
mode switching regulator with 2A integrated switches.
Its high frequency operation allows the use of small
inductors and capacitors, resulting in very compact power
supplies. The SC2440 is suitable for next generation XDSL
modems requiring operating frequencies in excess of 1.5
MHz. The two channels operate at 180° out of phase
for reduced input voltage ripples. Separate soft start/
shutdown pins allow independent control and output
sequencing for latch-up prevention. The SC2440 can also
be externally synchronized up to 2.5 MHz per channel.
Current-mode PWM control allows fast transient
response with simple loop compensation. Cycle-by-cycle
current limiting and hiccup overload protection reduce
power dissipation during overload.
SC2440
2.5 MHz Dual Switwcwhw.iDnatgaShReeet4Ug.cuomlator
with Integrated 2A Switches
Features
u Up to 2.5 MHz/Channel Programmable Switching
Frequency
u Fixed Frequency Current-mode Control
u Wide Input Voltage Range 2.8V to 20V
u Out of Phase Switching Reduces Ripple
u Cycle-by-cycle Current-limiting
u Independent Shutdown/soft-start Pins
u Independent Hiccup Overload Protection
u Independent Power-Good Indicators
u Two 2A Integrated Switches
u External Synchronization
u Thermal Shutdown
u Thermally Enhanced 16-pin TSSOP Package
Applications
u XDSL and Cable Modems
u Set-up Boxes
u Point of Load Applications
u CPE Equipment
u DSP Power Supplies
u Disk Drives
Typical Application Circuit
R6
100K
R5 C5
FB1
PGOOD1 BOOST1
15.4K C6 470pF
C7 10pF
22nF
C10
R9
15K
22nF C9
R7 10pF C8
24.3K 220pF
COMP1
SW1
SS1 SC2440
SYNC
ROSC
IN
VIN
12V
C15
10µF
SS2
COMP2
SW2
FB2 BOOST2
GND PGOOD2
C4
0.1µF
R8
100K
D3
C2 1N4148
0.1µF
L1
3.3µH
D1
UPS120
C1
10µF
R1
23. 3K
R2
10K
D2
UPS120
L2
4.4µH
D4
1N4148
C3
10µF
R3
40. 2K
R4
10K
OUT1
3.3V /2A
OUT2
5V/2 A
L1: Sumida CR43
L2: F alco D04012
Figure 1. 1.3MHz 12V to 3.3V and 5V Step-down Converter
Revision: March 5, 2007
1
Efficiency vs Load Current
95
VIN = 12V
90
VOUT2 = 5V
85
80
VOUT1 = 3.3V
75
70
65
60
55
50
0
0.5 1 1.5
Load Current (A)
2
www.semtech.com




Semtech Corporation

SC2440 Datasheet Preview

SC2440 Datasheet

2.5 MHz Dual Switching Regulator

No Preview Available !

SC2440
www.DataSheet4U.com
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.
Parameter
Symbol
Max Units
Input Voltage
Boost Pin
Boost Pin Above SW
PGOOD Pin Voltage
SS Pins
FB Pins
SYNC Pin Current
SW Voltage
SW Transient Spikes (<10ns Duration)
VIN
VBST
VBST-VSW
VPGOOD
VSS
VFB
ISYNC
VSW
VSW
-0.3 to 20
40
20
VIN
3
-0.3 to VIN
5
-0.6 to VIN
VIN +1.5
-2.5
V
V
V
V
V
V
mA
V
V
Operating Ambient Temperature Range
TA
Thermal Resistance Junction to Ambient
θJA
Maximum Junction Temperature
TJ
Storage Temperature Range
TSTG
Lead Temperature (Soldering)10 sec
Electrical Characteristics
TLEAD
Unless specified: -40°C < TA < 85°C, -40°C < TJ< 105°C, ROSC = 12.1K, VSYNC = 0, VIN = 5V, VBOOST = 8V
Parameter
Conditions
-40 to 85
45
150
-65 to +150
300
Min Typ
°C
°C/W
°C
°C
°C
Max Units
VIN Start Voltage
VIN Start Hysteresis
Quiescent Current
Shutdown Current
Feedback Voltage
Feedback Voltage Line
Regulation
FB Pin Input Bias Current
Error Amplifier Transconductance
Error Amplifier Open-loop Gain
COMP Source Current
COMP Sink Current
COMP Pin to Switch Current Gain
© 2005 Semtech Corp.
Not switching, PGOOD Open
VSS1 = VSS2 = 0V, PGOOD Open
VIN = 3V to 20V
V = 1V, V = 1.5V
FB COMP
VFB = 0.8V, VCOMP = 1.5V
VFB = 1.2V, VCOMP = 1.5V
2
2.45
0.980
2.62
75
3.3
38
1.000
0.005
2.78
4.3
60
1.020
V
mV
mA
µA
V
%/V
-15 -30
nA
280 µ-1
53 dB
20 µA
20 µA
5.7 A/V
www.semtech.com


Part Number SC2440
Description 2.5 MHz Dual Switching Regulator
Maker Semtech Corporation
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SC2440 Datasheet PDF






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