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LTC3736 PDF预览

LTC3736

更新时间： 2024-09-23 22:55:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
28页 351K
描述
Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking

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中文翻译

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LTC3736 数据手册

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LTC3736  
TM  
Dual 2-Phase, No RSENSE  
,
Synchronous Controller  
with Output Tracking  
U
FEATURES  
DESCRIPTIO  
The LTC®3736 is a 2-phase dual synchronous step-down  
switching regulator controller with tracking that drives  
externalcomplementarypowerMOSFETsusingfewexter-  
nal components. The constant frequency current mode  
architecture with MOSFET VDS sensing eliminates the  
need for sense resistors and improves efficiency. Power  
loss and noise due to the ESR of the input capacitance are  
minimized by operating the two controllers out of phase.  
■
No Current Sense Resistors Required  
■
Out-of-Phase Controllers Reduce Required  
Input Capacitance  
Tracking Function  
Wide VIN Range: 2.75V to 9.8V  
■
■
■
Constant Frequency Current Mode Operation  
■
0.6V ±1.5% Voltage Reference  
■
Low Dropout Operation: 100% Duty Cycle  
■
True PLL for Frequency Locking or Adjustment  
BurstModeoperationprovideshighefficiencyatlightloads.  
100%dutycyclecapabilityprovideslowdropoutoperation,  
extending operating time in battery-powered systems.  
Selectable Burst Mode®/Forced Continuous Operation  
■
■
Auxiliary Winding Regulation  
Internal Soft-Start Circuitry  
Power Good Output Voltage Monitor  
Output Overvoltage Protection  
Micropower Shutdown: IQ = 9µA  
■
■
■
■
■
Theswitchingfrequencycanbeprogrammedupto750kHz,  
allowing the use of small surface mount inductors and ca-  
pacitors. For noise sensitive applications, the LTC3736  
switching frequency can be externally synchronized from  
250kHz to 850kHz. Burst Mode operation is inhibited dur-  
ingsynchronizationorwhentheSYNC/FCBpinispulledlow  
inordertoreducenoiseandRFinterference.Automaticsoft-  
start is internally controlled.  
Tiny Low Profile (4mm × 4mm) QFN and Narrow  
SSOP Packages U  
APPLICATIO S  
■
One or Two Lithium-Ion Powered Devices  
Notebook and Palmtop Computers, PDAs  
Portable Instruments  
Distributed DC Power Systems  
The LTC3736 is available in the tiny thermally enhanced  
(4mm × 4mm) QFN package or 24-lead SSOP narrow  
package.  
■
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
No RSENSE is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter  
Efficiency vs Load Current  
V
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
IN  
2.75V TO 9.8V  
10µF  
×2  
V
+
IN  
V
= 3.3V  
IN  
+
SENSE1 SENSE2  
V
IN  
= 4.2V  
TG1  
TG2  
2.2µH  
2.2µH  
SW1  
SW2  
V
= 5V  
IN  
LTC3736  
BG1  
BG2  
PGND  
PGND  
118k  
187k  
V
OUT1  
2.5V  
V
OUT2  
1.8V  
V
FB1  
V
FB2  
FIGURE 16 CIRCUIT  
I
I
TH1  
TH2  
+
+
220pF  
15k  
V
= 2.5V  
220pF  
59k  
SGND  
OUT  
47µF  
47µF  
1
10  
100  
1000  
10000  
15k  
59k  
LOAD CURRENT (mA)  
3736 TA01b  
3736 TA01a  
3736f  
1
1234567...28

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