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SC2441EVB

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
35页 718K
描述
Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter

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SC2441EVB 数据手册

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SC2441  
Very Low Input Voltage 2-Phase Synchronous  
Step-down Controllers with Step-up Converter  
POWER MANAGEMENT  
Features  
Description  
2-Phase Synchronous step-down controllers  
‹ 2-Phase Synchronous Continuous Conduction Mode  
For High Efficiency Step-down Converters  
‹ Out of Phase Operation For Low Input Current Ripples  
‹ Operates Up To 1MHz Per Channel  
‹ Configurable Dual Outputs Or 2-Phase Single Output  
Operation with Peak Current Mode Control  
‹ Excellent Current Sharing Between Phases  
‹ Wide Input Voltage Range: 1.8V to 15V  
‹ Duty Cycle Up to 90%  
‹ 0.5V Feedback Voltages For Low-Voltage Outputs  
‹ Precision 50mV Current-Limit Threshold  
‹ Patented Combi-sense Technique for High SNR of Cur-  
rent-Sensing  
‹ Individual Soft-Start, Overload Shutdown and Enable  
Step-up Regulator  
The SC2441 is a high-frequency triple output switching  
regulator controller. It consists of a dual out-of-phase  
synchronous step-down PWM controller with high-current  
output gate drives and a 1.7A integrated step-up switch-  
ing regulator.  
The dual-phase step-down controller of the SC2441 can  
be configured to provide two individually controlled and  
regulated outputs or a single output with shared current  
in each phase. The buck controller can operate from an  
input voltage of at least 4.72V or they can run off a supply  
generated locally with the integrated boost regulator. This  
makes the SC2441 ideally suited for applications where a  
low-voltage input (3.3V, 2.5V, or 1.8V) is to be stepped  
down for lower voltage logic yet the input is too low to  
drive power MOSFET’s efficiently. The boost regulator can  
be used to provide a third auxiliary output while generat-  
ing the bias for the buck controllers.  
‹ Wide Input Voltage Range: 1.8V to 15V  
‹ Operates At Twice The Individual Channel Frequency  
Of The Buck Controllers  
‹ 0.23V VCESAT Switch at 1A  
‹ Fixed Frequency with Current-Mode Control  
Common Features  
Both the step-down controllers and the step-up regulator  
employ fixed frequency peak current-mode control for fast  
transient response. The master oscillator frequency can  
be programmed by the user.  
‹ External Synchronization  
‹ Industrial Temperature Range  
Individual soft-start and overload shutdown timer are em-  
ployed in each step-down controller for hiccup overload  
protection. In single-output configuration, the channel 1  
timer controls the soft-start and overload shutdown func-  
tions of both controllers.  
Applications  
‹ Low Voltage Distributed DC-DC Converters  
‹ Telecommunication Power Supplies  
‹ Servers and base stations  
Typical Application Circuit  
VIN VINGND  
+
C38  
R12  
D1  
D2  
R14  
VIN  
VIN  
D3  
L3  
7
8
C36  
FB3  
R28  
1
IN  
COMP3  
C3  
C1  
+
+
C4  
C18  
27  
C2  
VIN  
C17  
PH3  
28  
18  
19  
PVIN  
BST2  
GDH2  
25  
23  
BST1  
Q2  
Q7  
R4  
R3  
Q1  
Q6  
VO1  
GDH1  
VO2  
L2  
L1  
C20  
C19  
C8  
SC2441  
C25  
R5  
D7  
C23  
C15  
+
C24  
D10  
R7  
+
R8  
R10  
20  
22  
24  
26  
4
VO1GND  
GDL2  
GDL1  
PGND  
VPN1  
CS1+  
CS1-  
R9  
R6  
C21  
VO2GND  
R11  
R13  
2
16  
15  
14  
13  
VPN2  
CS2+  
CS2-  
RCS+2  
RCS+1  
RCS-1  
5
RCS-2  
11  
12  
FB2  
FB1  
C27  
C28  
COMP2  
COMP1  
C30  
R18  
R19  
C31  
R16  
9
GND  
Rosc  
VCC  
R17  
6
3
10  
21  
SYNC  
R20  
SS1/EN1  
SS2/EN2  
17  
C32  
C33  
U1  
Figure 1  
Revision: January 10, 2005  
1
www.semtech.com  
US patent 6,441,597  
1234567...35

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