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SC2441AEVB Datasheet(PDF) 1 Page - Semtech Corporation

Part # SC2441AEVB
Description  1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2441AEVB Datasheet(HTML) 1 Page - Semtech Corporation

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POWER MANAGEMENT
1
www.semtech.com
SC2441A
1.8V to 20V Input 2-Phase Synchronous
Step-down Controllers with Step-up Converter
Description
Revision: March 7, 2006
The SC2441A is a programmable frequency dual
independent or dual/multiple phase single output peak
current-mode step-down switching regulator controller. It
is capable of operating from 1.8V to 20V input. A 0.6A
step-up converter in the SC2441A generates an auxiliary
gate drive supply when VIN is below 4.5V. This makes the
SC2441A well suited for applications where a low-voltage
input (<3.3V) is to be stepped down for lower voltage logic,
yet the input is too low to drive power MOSFETs
efficiently.
The SC2441A employs a phase-locked synchronizing
circuit that allows the step-up converter to operate at
twice the switching frequency of the step-down
controllers for miniaturization. The clock output signal
enables two or more SC2441As to be daisy chained with
programmable phase shift.
Tying the FB2 pin to VIN makes the second step-down
channel a slave of the first. Operating in this mode, the
SC2441A regulates a single output with shared current in
each channel. Each step-down controller has its own soft-
start and overload shutdown timer for hiccup overload
protection. In the single-output mode, the channel 1 timer
controls the soft-start and overload hiccup of both
controllers.
Features
Applications
u Low voltage distributed DC-DC converters
u Telecommunication power supplies
u Servers and base stations
2-Phase Synchronous Step-down Controllers
u 2-Phase Synchronous Continuous Conduction Mode
u Out of Phase Operation for Low Input Current Ripple
u Operates up to 1MHz Per Channel
u Excellent Current Sharing Between Phases
u Duty Cycle Up to 90%
u 0.5V Feedback voltages for Low-Voltage Outputs
u Starts into Pre-biased Outputs
u Adaptive Shoot-through Protection
u Lossless Inductor DCR Current Sensing
u 23mV Current-limit Threshold
u Individual Soft-start, Overload Hiccup and Enable
Step-up Regulator
u 0.27V V
CESAT Switch at 0.6A
u Fixed frequency Current-mode Control
Common Features
u Wide input Voltage Range: 1.8V to 20V
u Synchronizing Frequency Equal to that of the Step-
down Converters
u 28-lead TSSOP-EDP Lead-free package, fully WEEE
and RoHS compliant
Typical Application Circuit
Figure 1
R21
C3
Vin
RCS+2
C21
R26
VCC
R23
R2
VCC
C8
D4
R11
U1
27
24
19
18
11
26
6
4
28
12
3
5
17
13
14
8
15
16
2
7
25
23
22
20
21
10
9
1
SW3
PGND1
GDH2
BST2
FB1
PGND2
SYNC/SHDN
CS1+
CKOUT
COMP1
SS1/EN1
CS1-
SS2/EN2
COMP2
FB2
COMP3
CS2-
CS2+
PLLF
FB3
BST1
GDH1
GDL1
GDL2
VCC
ROSC
GND
IN
R15
R16
R19
VOUT1
R1
C22
L2
R8
VCC
Signal
Ground
C24
R9
R24
C26
R13
Power
Ground
R4
L3
C25
Q3
C6
Q2
R10
R18
L1
C5
C20
C7
R20
R25
R12
D1
C19
C23
D2
C13
D3
Q4
R7
R3
C11
D5
VOUT2
Vin
C4
C2
C1
R27
RCS+1
R6
R5
C9
Q1
C12
SC2441A


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