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SC2447EVB

更新时间： 2024-10-01 04:05:27
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商升特 - SEMTECH 控制器
页数 文件大小 规格书
26页 756K
描述
Dual-Phase, Single or Dual Output Synchronous Step-Down Controller

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SC2447  
Dual-Phase, Single or Dual Output  
Synchronous Step-Down Controller  
POWER MANAGEMENT  
Features  
Description  
ꢀ2-Phase Step-down Controller optimized for Philips  
The SC2447 is a versatile high-frequency dual phase PWM  
step-down controller optimized for Philips and Renesas  
DrMOSTM. Both phases are capable of sourcing or sink-  
ing load currents, making the SC2447 suitable for net-  
working system power and DDR applications.  
or Renesas DrMOSTM  
ꢀOut of Phase Operation for Low Input Current Ripple  
ꢀOutputs Source and Sink Current  
ꢀFixed Frequency Peak Current-Mode Control  
ꢀLossless Inductor DCR Current Sensing  
ꢀOptional Resistor Current-Sensing for Precise Cur-  
rent-Limit  
The SC2447 employs fixed frequency, continuous-con-  
duction peak current-mode control for easy compensa-  
tion and fast transient response.  
ꢀDual 30A Outputs or 2-Phase 60A Single Output  
Operation  
ꢀWide Input Voltage Range: 4.65V to 15V  
ꢀIndividual Closed-Loop Soft-Start, Overload Shut-  
down Timer and Enable  
The SC2447 can be used to generate two independent  
outputs (up to 30A per output) or a single 60A output  
with shared phase current. The PWM signals are 180°  
out of phase to minimize input/output ripple.  
ꢀOutput Voltage as Low as 0.5V  
ꢀStarts into Pre-Bias Output  
ꢀTri-State PWM Output during Shutdown  
ꢀProgrammable Frequency Up to 1MHz Per Phase  
ꢀExternal Synchronization  
Either inductor DC resistance or precision sense resistor  
can be used for current-mode control. Inductor DC resis-  
tance sensing has the advantage of being lossless.  
ꢀTSSOP-28 Lead-free Package. Fully WEEE and RoHS  
Compliant  
Each phase has individual closed-loop soft-start and over-  
load shutdown timer. The SC2447 powers up neatly with  
pre-biased output. It has tri-state shutdown and hiccup  
overload protection. In two-phase single-output configu-  
ration, the master timer controls the soft-start and over-  
load shutdown functions. The SC2447 is in a lead-free,  
WEEE and RoHS compliant, TSSOP-28 package.  
Applications  
ꢀTelecommunication Power Supplies  
ꢀDDR Memory Power Supplies  
ꢀGraphic Power Supplies  
ꢀServers and Base Stations  
Typical Application Circuit  
VIN  
12V  
RVCC  
10Ω  
R2  
10Ω  
R1  
10Ω  
CIN2  
22µF  
x 4  
CIN1  
22µF  
x 4  
VDDO  
CBP  
VDDC  
VDDG  
VDDC  
VDDG  
VDDO  
CBP  
C3  
1µF  
C4  
1µF  
C5  
1µF  
C6  
1µF  
CB2  
100nF  
CB1  
100nF  
AVCC  
L1  
CBN  
VO  
CBN  
VO  
L2  
CVCC  
4.7µF  
1µH/1.8mΩ  
REG5V  
VI  
REG5V  
VI  
0.4µH/1mΩ  
VOUT1  
2.5V/20A  
VOUT2  
1.2V/25A  
GDH1  
GDL1  
GDH2  
GDL2  
RS1B  
RS2B  
200KΩ  
DISABLE  
DISABLE  
22.1KΩ  
CO1  
100µF  
x 3  
CO2  
100µF  
x 3  
VSSO  
VSSO  
VSSC  
VSSC  
RS1A  
22.1KΩ  
RS2A  
SC2447  
22.1KΩ  
PIP212-12M  
PIP212-12M  
CCS2  
68nF  
CS1+  
CS1-  
CCS1  
100nF  
CS2+  
CS2-  
RFB1A  
10KΩ  
RFB2A  
10KΩ  
RS2C , 20KΩ  
RS1C , 11KΩ  
IN1-  
IN2-  
COMP2  
ROSC  
AGND  
RFB1B  
2.49KΩ  
RFB2B  
7.15KΩ  
COMP1  
ROSC , 51.1KΩ  
RA1  
RA2  
REFOUT  
REF  
24.9KΩ  
16.9KΩ  
CCMP1  
10pF  
CCMP2  
10pF  
CA1  
CREF  
CA2  
3.3nF  
0.1uF  
3.3nF  
REFIN  
SYNC  
SS1/EN1  
SS2/EN2  
CSS1  
0.1µF  
CSS2  
0.1µF  
Figure 1  
1
www.semtech.com  
Revision: December 15, 2006  
1234567...26

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