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LTC3649 PDF预览

LTC3649

更新时间: 2023-12-20 18:45:46
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
26页 1656K
描述
具轨至轨可编程输出的 60V、4A、同步降压型稳压器

LTC3649 数据手册

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LTC3649  
60V, 4A Synchronous  
Step-Down Regulator with  
Rail-to-Rail Programmable Output  
DESCRIPTION  
FEATURES  
Wide V Range: 3.1V to 60V  
The LTC®3649 is a high efficiency 60V, 4A synchronous  
monolithic step-down regulator. The regulator features  
a single resistor programmable output voltage, internal  
n
IN  
n
Wide V  
Range: 0V to (V – 0.5V)  
OUT  
IN  
n
n
Single Resistor V  
Programming  
OUT  
Integrated 110mΩ Top N-Channel/50mΩ Bottom  
compensationandhighefficienciesoverawideV range.  
OUT  
N-Channel MOSFETs  
The step-down regulator operates from an input voltage  
rangeof3.1Vto60Vandprovidesanadjustablerail-to-rail  
n
n
n
95% Efficiency with 12V and 5V  
IN  
OUT  
Q
Regulated I : 440µA, Shutdown I : 18µA  
Q
output range from (V – 0.5V) to ground while delivering  
IN  
Accurate Current Monitoring ( 4%) without Sense  
up to 4A of output current. The switching frequency is  
also adjusted with an external resistor. A user-selectable  
mode input is provided to allow the user to trade off ripple  
noise for efficiency at light loads; Burst Mode operation  
provides the highest efficiency at light loads, while forced  
continuous mode provides low output ripple. The MODE/  
SYNCpincanalsobeusedtoallowtheusertosynchronize  
the switching frequency to an external clock.  
Resistor  
n
Accurate Resistor Programmable Frequency  
(300kHz to 3MHz) with 50% Frequency Sync Range  
Accurate Programmable Output Current  
Input Voltage Regulation for MPPT Applications  
0.ꢀ8 Output Voltage Accuracy  
n
n
n
n
n
n
n
n
n
Peak Current Mode Operation  
Programmable Wire Drop Compensation  
Burst Mode® Operation, Forced Continuous Mode  
Internal Compensation and Programmable Soft-Start  
Overtemperature Protection  
Available in Thermally Enhanced 2ꢀ-Lead (4mm ×  
5mm) QFN and TSSOP Packages  
The LTC3649 operates with a peak current mode architec-  
ture that allows for fast transient response with inherent  
cycle-to-cycle current limit protection. It also features  
programmable output current limit, current monitoring  
and input voltage regulation.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and OPTI-LOOP are  
registered trademarks of Analog Devices, Inc. All other trademarks are the property of their  
respective owners. Protected by U.S. Patents, including 54ꢀ117ꢀ, 5705919, 5ꢀ47554, 65ꢀ025ꢀ.  
APPLICATIONS  
n
Industrial Applications  
n
Automotive Applications  
TYPICAL APPLICATION  
Efficiency with VOUT = 5V  
ꢀꢁꢁ  
24V to 5VOUT Burst Mode Operation  
ꢃ ꢄꢅꢀ  
ꢃ ꢄ4ꢀ  
ꢁꢂ  
ꢁꢂ  
9ꢀ  
96  
94  
9ꢀ  
9ꢀ  
ꢀꢀ  
ꢀ6  
ꢀ4  
ꢀꢁ  
ꢀꢁ  
ꢇꢄꢙꢉꢊ  
6ꢄꢣꢉꢘ  
ꢁꢂ  
ꢢꢆꢆꢍꢅ ꢍꢎ  
ꢁꢂ  
ꢃꢄꢃꢀ ꢅꢆ 6ꢇꢀ  
ꢃꢀ  
4ꢜ  
ꢆꢌꢅ  
ꢋꢌꢂ  
ꢆꢌꢅ  
4ꢞꢉꢊ  
×ꢈ  
ꢈꢈꢉꢊ  
ꢑ3649  
ꢏꢐꢅꢀ  
ꢑꢑ  
ꢁꢅꢘ  
ꢒꢆꢓꢏꢔꢍꢕꢂꢑ  
ꢍꢖꢂꢓ  
ꢁꢂꢋꢏꢖ  
ꢑꢑ  
ꢁꢂꢅꢀ  
ꢗꢖꢂꢓ  
ꢈꢄꢈꢉꢊ  
ꢁꢍꢏꢅ  
ꢁꢒꢆꢂ  
ꢙꢇꢚꢊ  
ꢙꢇꢚꢊ  
ꢙꢇꢇꢛ  
ꢈꢇꢇꢛ  
ꢙꢇꢛ  
ꢀꢁꢂ  
ꢀꢁꢂ  
ꢀꢁꢂ  
3
3ꢀꢁ  
4
ꢄꢅꢆ  
ꢁꢂꢃ  
3649 ꢀꢁꢂꢃb  
f
ꢟ ꢃꢇꢇꢛꢘꢠ  
3649 ꢅꢜꢇꢙꢝ  
ꢍꢎ  
3649fb  
1
For more information www.linear.com/LTC3649  

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