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SC2441AEVB

更新时间： 2024-10-01 04:05:27
品牌 Logo 应用领域
商升特 - SEMTECH 转换器控制器升压转换器
页数 文件大小 规格书
37页 1649K
描述
1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter

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SC2441A  
1.8V to 20V Input 2-Phase Synchronous  
Step-down Controllers with Step-up Converter  
POWER MANAGEMENT  
Features  
Description  
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.  
2-Phase Synchronous Step-down Controllers  
ꢀ 2-Phase Synchronous Continuous Conduction Mode  
ꢀ Out of Phase Operation for Low Input Current Ripple  
ꢀ Operates up to 1MHz Per Channel  
ꢀ Excellent Current Sharing Between Phases  
ꢀ Duty Cycle Up to 90%  
ꢀ 0.5V Feedback voltages for Low-Voltage Outputs  
ꢀ Starts into Pre-biased Outputs  
ꢀ Adaptive Shoot-through Protection  
ꢀ Lossless Inductor DCR Current Sensing  
ꢀ 23mV Current-limit Threshold  
ꢀ Individual Soft-start, Overload Hiccup and Enable  
Step-up Regulator  
ꢀ 0.27V VCESAT Switch at 0.6A  
ꢀ Fixed frequency Current-mode Control  
Common Features  
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.  
ꢀ Wide input Voltage Range: 1.8V to 20V  
ꢀ Synchronizing Frequency Equal to that of the Step-  
down Converters  
ꢀ 28-lead TSSOP-EDP Lead-free package, fully WEEE  
and RoHS compliant  
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.  
Applications  
ꢀ Low voltage distributed DC-DC converters  
ꢀ Telecommunication power supplies  
ꢀ Servers and base stations  
Typical Application Circuit  
Vin  
VCC  
C1  
VCC  
R1  
R2  
C2  
D1  
C3  
R3  
R4  
C4  
D2  
L1  
R5  
C5  
U1  
D3  
1
7
8
IN  
FB3  
R6  
COMP3  
27  
21  
25  
23  
SW3  
VCC  
R7  
28  
18  
19  
CKOUT  
BST2  
C6  
C7  
Q1  
BST1  
GDH1  
Q2  
R9  
GDH2  
L2  
VOUT1  
VOUT2  
R8  
L3  
C8  
D4  
Q3  
R10  
C11  
C12  
C13  
R13  
R11  
D5  
Q4  
22  
24  
26  
4
20  
R12  
GDL1  
PGND1  
PGND2  
CS1+  
GDL2  
C9  
R15  
R16  
R18  
RCS+1  
RCS+2  
2
PLLF  
CS2+  
CS2-  
16  
15  
14  
13  
5
CS1-  
11  
12  
FB1  
FB2  
C20  
C19  
COMP1  
COMP2  
R19  
R20  
C21  
C22  
R21  
10  
9
6
Vin  
ROSC SYNC/SHDN  
SS1/EN1  
C23  
R23  
R26  
3
R24  
R25  
VCC  
17  
GND  
SS2/EN2  
R27  
C26  
C25  
Power  
Ground  
Signal  
Ground  
C24  
SC2441A  
Figure 1  
Revision: March 7, 2006  
1
www.semtech.com  
1234567...37

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