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LTC3736-2 PDF预览

LTC3736-2

更新时间: 2024-11-13 14:57:35
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 349K
描述
具有输出跟踪功能的双通道、两相、No RSENSE? 同步控制器

LTC3736-2 数据手册

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LTC3736-2  
TM  
Dual 2-Phase, No R  
,
SENSE  
Synchronous Controller  
with Output Tracking  
DESCRIPTION  
FEATURES  
TheLTC®3736-2 isa2-phasedualsynchronousstep-down  
switching regulator controller with tracking that drives  
external complementary power MOSFETs using few ex-  
ternalcomponents.Theconstant-frequencycurrentmode  
n
No Current Sense Resistors Required  
n
Out-of-Phase Controllers Reduce Required  
Input Capacitance  
Tracking Function  
n
n
Wide V Range: 2.75V to 9.8V  
architecturewithMOSFETV sensingeliminatestheneed  
IN  
DS  
n
0.6V ±±1 Voltage Reference  
forsenseresistorsandimprovesefficiency.Powerlossand  
noiseduetotheESRoftheinputcapacitanceareminimized  
by operating the two controllers out-of-phase.  
n
High Current Limit  
n
Constant-Frequency Current Mode Operation  
n
Low Dropout Operation: 100% Duty Cycle  
Pulse-skipping operation provides high efficiency at light  
loads. 100% duty cycle capability provides low dropout  
operation, extending operating time in battery-powered  
systems.  
n
True PLL for Frequency Locking or Adjustment  
n
Selectable Pulse-Skipping/Forced Continuous  
Operation  
n
Auxiliary Winding Regulation  
n
Theswitchingfrequencycanbeprogrammedupto750kHz,  
allowing the use of small surface mount inductors and  
capacitors.Fornoisesensitiveapplications,theLTC3736-2  
switching frequency can be externally synchronized from  
250kHz to 850kHz. An internal soft-start, which can be  
lengthened externally, smoothly ramps the output voltage  
during start-up.  
Internal Soft-Start Circuitry  
n
Power Good Output Voltage Monitor  
n
Output Overvoltage Protection  
n
Micropower Shutdown: I = 9μA  
Q
n
Tiny Low Profile (4mm × 4mm) QFN and Narrow  
SSOP Packages  
APPLICATIONS  
The LTC3736-2 is available in the tiny thermally enhanced  
(4mm × 4mm) QFN and 24-lead narrow SSOP packages.  
n
One or Two Lithium-Ion Powered Devices  
n
Notebook and Palmtop Computers, PDAs  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
n
No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents, including 5481178,  
5929620, 6144194, 6580258, 6304066, 6611131, 6498466.  
SENSE  
Portable Instruments  
Distributed DC Power Systems  
n
TYPICAL APPLICATION  
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter  
Efficiency and Power Loss  
vs Load Current (Figure ±5 Circuit)  
V
IN  
2.75V TO 9.8V  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
10  
V
OUT  
= 2.5V  
10μF  
s2  
V
+
IN  
+
SENSE1 SENSE2  
EFFICIENCY  
1
TG1  
TG2  
2.2μH  
2.2μH  
SW1  
SW2  
LTC3736-2  
0.1  
0.01  
0.001  
POWER LOSS  
BG1  
BG2  
PGND  
PGND  
118k  
187k  
V
V
OUT1  
2.5V  
OUT2  
1.8V  
V
FB1  
V
FB2  
I
I
TH1  
TH2  
220pF  
15k  
220pF  
59k  
SGND  
47μF  
47μF  
15k  
59k  
1
10  
100  
1000  
10000  
LOAD CURRENT (mA)  
37362 TA01b  
37362 TA01a  
37362fb  
1

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