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LTC3634

更新时间： 2024-11-20 14:57:47
品牌 Logo 应用领域
亚德诺 - ADI 双倍数据速率稳压器
页数 文件大小 规格书
28页 450K
描述
用于 DDR 电源的 15V、双通道、3A、单片式、降压型稳压器

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中文翻译

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LTC3634 数据手册

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LTC3634  
15V Dual 3A Monolithic  
Step-Down Regulator  
for DDR Power  
FEATURES  
DESCRIPTION  
n
3.6V to 15V Input Voltage Range  
TheLTC®3634isahighefficiency,dual-channelmonolithic  
synchronous step-down regulator which provides power  
supply and bus termination rails for DDR1, DDR2, and  
DDR3 SDRAM controllers. The operating input voltage  
range is 3.6V to 15V, making it suitable for point-of-load  
power supply applications from a 5V or 12V input, as well  
as various battery powered systems.  
n
3A Output Current per Channel  
n
Up to 95% Efficiency  
n
Selectable 90°/180° Phase Shift Between Channels  
n
Adjustable Switching Frequency: 500kHz to 4MHz  
n
VTTR = V  
/2 = V Reference  
DDQ  
TT  
n
n
n
n
1.6% Accurate VTTR at 0.75V  
Optimal V Range: 0.6V to 3V  
OUT  
The V regulated output voltage is equal to VDDQIN•0.5.  
TT  
10mA Buffered Output Supplies V Reference Voltage  
REF  
An on-chip buffer capable of driving a 10mA load pro-  
vides a low noise reference output (VTTR) also equal to  
VDDQIN•0.5.  
Current Mode Operation for Excellent Line and Load  
Transient Response  
n
n
n
n
n
External Clock Synchronization  
The operating frequency is programmable and synchro-  
nizable from 500kHz to 4MHz with an external resistor.  
The two channels can operate 180° out-of-phase, which  
relaxestherequirementsforinputandoutputcapacitance.  
The unique controlled on-time architecture is ideal for  
powering DDR applications from a 12V supply at high  
switchingfrequencies,allowingtheuseofsmallerexternal  
components.  
Short-Circuit Protected  
Input Overvoltage and Overtemperature Protection  
Power Good Status Outputs  
Available in (4mm × 5mm) QFN-28 and Thermally  
Enhanced 28-Lead TSSOP Packages  
APPLICATIONS  
n
DDR Memory Power Supplies  
The LTC3634 is offered in both 28-pin 4mm × 5mm QFN  
and 28-pin exposed pad TSSOP packages.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and PolyPhase are registered  
trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks  
are the property of their respective owners. Protected by U.S. Patents including 5481178,  
5847554, 6580258, 6476589, 6774611.  
TYPICAL APPLICATION  
V
IN  
Efficiency and Power Loss  
vs Load Current  
3.6V TO 15V  
47µF  
V
V
IN1  
IN2  
×2  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
RUN1  
RUN2  
BOOST1  
SW1  
V
= 12V  
IN  
0.1µF  
0.1µF  
1.5µH  
V
DDQ  
LTC3634  
INTV  
CC  
1.8V/3A  
PHMODE  
MODE/SYNC  
V
ON1  
2.2µF  
100µF  
×2  
VDDQIN  
24.3k  
12.1k  
0.82µH  
V
V
V
DDQ  
V
FB1  
(SINKING CURRENT)  
TT  
TT  
RT  
ITH1  
(SOURCING CURRENT)  
BOOST2  
324k  
26.4k  
560pF  
V
TT  
SW2  
0.9V/ 3A  
V
FB2  
100µF  
×4  
V
ON2  
V
REF  
ITH2  
VTTR  
0.9V  
0.01µF  
SGND PGND  
18k  
910pF  
2
3
0
0.5  
1
1.5  
2.5  
3634 TA01a  
LOAD CURRENT (A)  
3634 TA01b  
3634fc  
1
For more information www.linear.com/LTC3034  
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