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LTC3736EGN-2#TR PDF预览

LTC3736EGN-2#TR

更新时间： 2024-09-24 19:47:51
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
28页 427K
描述
LTC3736-2 - Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking; Package: SSOP; Pins: 24; Temperature Range: -40°C to 85°C

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LTC3736EGN-2#TR 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：SSOP包装说明：SSOP, SSOP24,.3
针数：24Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.2模拟集成电路 - 其他类型：DUAL SWITCHING CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：9.8 V最小输入电压：2.75 V
标称输入电压：4.2 VJESD-30 代码：R-PDSO-G24
JESD-609代码：e0长度：8.2 mm
湿度敏感等级：1功能数量：1
端子数量：24最高工作温度：85 °C
最低工作温度：最大输出电流：1 A
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装等效代码：SSOP24,.3封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, SHRINK PITCH峰值回流温度（摄氏度）：235
认证状态：Not Qualified座面最大高度：2 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：PUSH-PULL最大切换频率：825 kHz
技术：CMOS温度等级：OTHER
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：20宽度：5.3 mm
Base Number Matches：1

LTC3736EGN-2#TR 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 R  
is a trademark of  
SENSE  
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.  
U
TYPICAL APPLICATIO  
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter  
Efficiency vs Load Current  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
IN  
2.75V TO 9.8V  
10µF  
×2  
V
+
V
IN  
= 3.3V  
IN  
+
SENSE1 SENSE2  
V
IN  
= 4.2V  
TG1  
TG2  
2.2µH  
2.2µH  
SW1  
SW2  
V
IN  
= 5V  
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  
V
OUT  
= 2.5V  
220pF  
15k  
220pF  
59k  
SGND  
47µF  
47µF  
1
10  
100  
1000  
10000  
15k  
59k  
LOAD CURRENT (mA)  
3736 TA01b  
3736 TA01a  
3736fa  
1
1234567...28

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