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LTC3770EUH

更新时间： 2024-09-23 21:55:47
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
24页 302K
描述
Synchronous Controller with Margining, Tracking and PLL

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中文翻译

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LTC3770EUH 数据手册

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LTC3770  
Fast No RSENSETM Step-Down  
Synchronous Controller with  
Margining, Tracking and PLL  
U
FEATURES  
DESCRIPTIO  
■
Wide VIN Range: 4V to 32V  
The LTC®3770 is a synchronous step-down switching  
regulator controller with output voltage up/down tracking  
capability and voltage margining. Its advanced functions  
and high accuracy reference are ideal for powering  
high performance server, ASIC and computer memory  
systems.  
■
±0.67% 0.6V Reference Voltage  
■
Output Voltage Tracking Capability  
■
Programmable Margining  
■
Sense Resistor Optional  
■
True Current Mode Control  
■
2% to 90% Duty Cycle at 200kHz  
The LTC3770 uses a constant on-time, valley current  
mode control architecture to deliver very low duty factors  
without requiring a sense resistor. The operating fre-  
quency is selected by an external resistor and is compen-  
sated for variations in input supply voltage. An internal  
phase-lock loop allows the IC to be synchronized to an  
external clock.  
■
t
ON(MIN) ≤ 100ns  
■
■
■
■
■
■
■
■
■
Phase Lock Loop Frequency Synchronization  
Powerful Dual N-Channel MOSFET Driver  
Adjustable Cycle-by-Cycle Current Limit  
Adjustable Switching Frequency  
Programmable Soft-Start  
Current Foldback Protection (Disabled at Start-Up)  
Output Overvoltage Protection  
Micropower Shutdown: IQ < 30µA  
Power Good Output Voltage Monitor  
Tracks the Reference Input Pin  
Available in (5mm × 5mm) QFN and 28-Lead  
Fault protection is provided by an overvoltage comparator  
andinputundervoltagelockout. Theregulatorcurrentlimit  
is user programmable. A wide supply range allows volt-  
agesashighas32Vtobesteppeddowntoaslowasa0.6V  
output. Power supply sequencing is accomplished using  
an external soft-start timing capacitor.  
■
SSOP Packages U  
, LTC and LT are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. No R  
Technology Corporation. Protected by U.S. Patents including 5481178, 5487554, 6580258,  
6304066, 6476589, 6774611.  
is a trademark of Linear  
SENSE  
APPLICATIO S  
■
Distributed Power Systems  
Server Power Supply  
■
U
TYPICAL APPLICATIO  
High Efficiency Step-Down Converter  
Efficiency and Power Loss vs Load Current  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
10  
PGOOD  
MARGIN  
I
ON  
V
V
= 5V  
IN  
OUT  
68k  
= 2.5V  
V
0.01µF  
IN  
V
IN  
10k  
5V TO 28V  
EFFICIENCY  
PLLFLTR  
PLLIN  
10µF  
35V  
x3  
Si4884  
TG  
1
1.8µH  
0.1µF  
SW  
V
2.5V  
10A  
OUT  
TRACK/SS  
0.22µF  
BOOST  
LTC3770  
SGND INTV  
+
I
TH  
180µF  
4V  
x2  
10k  
CMDSH-3  
1000pF  
V
POWER LOSS  
CC  
CC  
0.1  
DRV  
RUN  
B340A  
Si4874  
V
BG  
+
OUT  
ON  
SENSE  
V
V
RNG  
95.3k  
30.1k  
10µF  
REFOUT  
0.01  
10  
–
SENSE  
PGND  
10k  
82k  
0.01  
0.1  
1
V
LOAD CURRENT (A)  
REFIN  
3770 TA01b  
MPGM  
V
FB  
3770 TA01  
3770f  
1
1234567...24

中文翻译

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