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LTC3714

更新时间： 2023-12-20 18:44:42
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
28页 338K
描述
具内部运放的 Intel 兼容、宽工作范围、降压型控制器

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LTC3714 数据手册

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LTC3714  
Intel Compatible,  
Wide Operating Range, Step-Down Controller  
with Internal Op Amp  
FeaTures  
DescripTion  
True Current Mode with Ultrafast Transient Response The LTC®3714 is a synchronous step-down switching  
n
n
n
Stable with Ceramic C  
ON(MIN)  
Ranges  
regulator controller for CPU power. An output voltage  
between 0.6V and 1.75V is selected by a 5-bit code (Intel  
mobile VID specification). The controller uses a constant  
on-time, valley current control architecture to deliver very  
low duty cycles without requiring a sense resistor. Oper-  
OUT  
t
< 100ns for Operation from High Input  
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Supports Active Voltage Positioning  
No Sense Resistor Required  
5-Bit VID Programmable Output Voltage: 0.6V to 1.75V ating frequency is selected by an external resistor and is  
Dual N-Channel MOSFET Synchronous Drive  
Programmable Output Offsets  
compensated for variations in V and V  
.
IN  
OUT  
Discontinuous mode operation provides high efficiency  
operation at light loads. A forced continuous control pin  
reduces noise and RF interference and can assist second-  
ary winding regulation by disabling discontinuous mode  
when the main output is lightly loaded. Internal op amp  
allows programmable offsets to the output voltage during  
power saving modes.  
Power Good Output Voltage Monitor  
Wide V Range: 4V to 36V  
IN  
1ꢀ 0.6V Reference  
Adjustable Frequency  
Programmable Soft-Start  
Output Overvoltage Protection  
Optional Short-Circuit Shutdown Timer  
Forced Continuous Control Pin  
Fault protection is provided by internal foldback current  
limiting, an output overvoltage comparator and optional  
short-circuit shutdown timer. Soft-start capability for  
supply sequencing is accomplished using an external  
timing capacitor. The regulator current limit level is user  
programmable. Wide supply range allows operation from  
4V to 36V at the input.  
Logic Controlled Micropower Shutdown: I ≤ 30µA  
Available in 0.209" Wide 28-Lead SSOP Package  
Q
applicaTions  
Power Supply for Mobile Pentium® Processors and  
n
Transmeta Processors  
L, LTC and LT are registered trademarks of Linear Technology Corporation.  
Pentium is a registered trademark of Intel Corporation.  
n
Notebook and Portable Computers  
Typical applicaTion  
LTC3714  
R
ON  
Transient Response of 8A to 23A Output Load Step  
PGOOD  
I
ON  
INTV  
C
CC  
V
IN  
V
IN  
SS  
0.1µF  
5V TO 24V  
10µF  
35V  
×4  
M1  
1.395V  
RUN/SS  
TG  
IRF7811  
×2  
L1  
0.68µH  
V
I
SW  
OUT  
TH  
V
C , 0.22µF  
B
OUT  
0.6V TO 1.75V  
23A  
R
C
C
C
1.35V  
C
OUT  
BOOST  
+
D
B
CMDSH-3  
50mV/DIV  
270µF  
2V  
SGND  
INTV  
CC  
×4  
M2  
IRF7811  
×3  
1.213V  
D1*  
UPS840  
BG  
VID4  
VID3  
VID2  
VID1  
VID0  
23A  
SENSE  
5-BIT  
VID  
+
I
LOAD  
C
VCC  
4.7µF  
0.003Ω*  
10A/DIV  
8A  
PGND  
3714 TA03  
V
OSENSE  
20µs/DIV  
3714 F01  
*OPTIONAL  
Figure 1. High Efficiency Step-Down Converter  
3714f  
1
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