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SC1486A

更新时间： 2024-11-21 04:05:35
品牌 Logo 应用领域
商升特 - SEMTECH 双倍数据速率控制器
页数 文件大小 规格书
29页 629K
描述
Dual Synchronous Buck DDR and DDR2 Power Supply Controller

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SC1486A 数据手册

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SC1486A  
Dual Synchronous Buck  
DDR and DDR2 Power Supply Controller  
POWER MANAGEMENT  
Description  
Features  
The SC1486A is a dual output constant on-time ‹ 1% DC accuracy  
synchronous buck PWM controller optimized for cost  
effective mobile DDR and DDR2 applications. Features  
include high efficiency, a fast dynamic response with no  
minimum on time, a REFIN input and a buffered REFOUT  
pin capable of sourcing 3mA. The excellent transient  
response means that SC1486A based solutions will  
require less output capacitance than competing fixed  
frequency converters.  
‹ Compatible with DDR & DDR2 memory power  
requirements  
‹ Constant on-time for fast dynamic response  
‹ VIN range = 1.8V – 25V  
‹ DC current sense using low-side RDS(ON) sensing  
or sense resistor  
‹ Integrated reference buffer for VTT  
‹ Low power S3 state with high-Z VTT  
‹ Resistor programmable on-time  
‹ Cycle-by-cycle current limit  
The output voltage of the first controller can be adjusted  
from 0.5V to VCCA. In DDR applications, this voltage is  
set to 2.5 volts, and in DDR2, 1.8V. A resistor divider  
‹ Digital soft-start  
from this supply is used to drive the REFIN pin of the ‹ PSAVE option for VDDQ  
second controller. A unity gain buffer drives the REFOUT  
pin to the same potential as REFIN. The second controller  
regulates its output to REFOUT. Two frequency setting  
resistors set the on-time for each buck controller. The  
frequency can thus be tailored to minimize crosstalk. The  
integrated gate drivers feature adaptive shoot-through  
protection and soft switching, requiring no gate resistors  
for the top MOSFET. Additional features include cycle-  
by-cycle current limit, digital soft-start, over-voltage and  
under-voltage protection, and a Power Good output for  
each controller.  
‹ Over-voltage/under-voltage fault protection  
‹ <20µA shutdown current  
‹ Low quiescent power dissipation  
‹ Two Power Good indicators  
‹ Separate enable for each switcher  
‹ Integrated gate drivers with soft switching - no gate  
resistors required  
‹ Efficiency >90%  
‹ 28 Lead TSSOP (lead free available)  
Applications  
‹ Notebook computers  
‹ CPU I/O supplies  
Typical Application Circuit  
‹ Handheld terminals and PDAs  
VBAT  
5VSUS  
5VSUS  
VBAT  
D1  
C1 0.1uF  
U1  
SC1486A  
BST1  
R1  
RTON1  
R2  
10R  
22  
23  
7
6
5
4
3
EN/PSV1  
Q1  
C2  
10uF  
TON1  
VOUT1  
VCCA1  
FB1  
DH1  
LX1  
VDDQ  
24  
25  
26  
27  
28  
L1  
R3  
R4  
VDDQ  
ILIM1  
C3  
+
R5  
VDDP1  
DL1  
Q2  
R6 0R  
2
1
PGOOD  
PGD1  
VSSA1  
VSSA1  
C4  
1uF  
R7  
PGND1  
C5  
C6  
1nF  
1uF  
VSSA1  
5VSUS  
VBAT  
5VSUS  
VDDQ  
5VRUN  
VBAT  
R8  
R9  
10k  
10R  
D2  
C7 0.1uF  
R10  
8
9
21  
20  
19  
18  
17  
16  
15  
REFIN  
TON2  
BST2  
DH2  
RTON2  
Q3  
Q4  
C8  
10uF  
REFOUT  
10  
11  
12  
REFOUT  
VCCA2  
FB2  
LX2  
L2  
R11  
R12  
10R  
R13  
VTT  
ILIM2  
VDDP2  
DL2  
C9  
+
VTT  
R14 0R  
VSSA2  
13  
14  
PGOOD  
PGD2  
VSSA2  
C10  
1uF  
R15  
10k  
PGND2  
C11  
1nF  
C12  
C13  
1uF  
C14  
1uF  
100nF  
VSSA2  
Revision: June 22, 2004  
1
www.semtech.com  
1234567...29

中文翻译

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