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LTC3850-2 PDF预览

LTC3850-2

更新时间： 2024-09-24 14:57:27
品牌 Logo 应用领域
亚德诺 - ADI 开关控制器
页数 文件大小 规格书
36页 1146K
描述
双通道、两相同步降压型开关控制器

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中文翻译

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LTC3850-2 数据手册

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LTC3850-2  
Dual, 2-Phase Synchronous Step-  
Down Switching Controller  
FEATURES  
DESCRIPTION  
The LTC®3850-2 is a high performance dual synchronous  
step-down switching regulator controller that drives all  
N-channel power MOSFET stages. A constant-frequency  
current mode architecture allows a phase-lockable  
frequency of up to 780kHz. Power loss and supply noise  
are minimized by operating the two controller output  
stages out of phase.  
n
Dual, 180° Phased Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
High Efficiency: Up to 95%  
n
n
n
n
n
n
n
n
n
n
n
n
n
R
or DCR Current Sensing  
SENSE  
1% 0.8V Output Voltage Accuracy  
Phase-Lockable Fixed Frequency 250kHz to 780kHz  
Supports Pre-Biased Output  
Dual N-Channel MOSFET Synchronous Drive  
OPTI-LOOP® compensation allows the transient response  
to be optimized over a wide range of output capacitance  
and ESR values. The LTC3850-2 features a precision 0.8V  
reference and a power good output indicator. A wide 4V  
to 30V input supply range encompasses most battery  
chemistries and intermediate bus voltages.  
Wide V Range: 4V to 30V Operation  
IN  
Adjustable Soft-Start Current Ramping or Tracking  
Foldback Output Current Limiting  
Output Overvoltage Protection  
Power Good Output Voltage Monitor  
28-Pin Narrow SSOP Package  
Independent TK/SS pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
The MODE/PLLIN pin selects among Burst Mode® oper-  
ation, pulse-skipping mode, or continuous inductor cur-  
rent mode and allows the IC to be synchronized to an  
external clock.  
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
Notebook and Palmtop Computers  
n
Portable Instruments  
n
Battery-Operated Digital Devices  
DC Power Distribution Systems  
n
The LTC3850-2 is identical to the LTC3850-1, except they  
have different pin assignments.  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. Patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787,  
6304066, 6580258..  
TYPICAL APPLICATION  
High Efficiency Dual 3.3V/2.5V Step-Down Converter  
Efficiency  
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ꢙꢥꢐ  
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ꢃRꢙꢚꢛꢘꢜꢜꢃꢜꢐR  
ꢒꢁꢓꢅR ꢀꢁꢔꢔ  
ꢋꢌꢌꢌ  
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ꢔꢙꢖꢔꢙꢈ  
ꢀ.ꢁꢂꢃ  
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Rꢏꢖꢁ  
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ꢅ.ꢅꢍ  
ꢌA  
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ꢃꢓꢁ  
ꢋꢌ  
ꢋꢌꢌ  
ꢌA  
ꢄꢅ.ꢆꢇ  
ꢆꢅ.ꢈꢇ  
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ꢀꢁAꢂ ꢃꢄRRꢅꢆꢇ ꢈꢉAꢊ  
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ꢙꢖꢕꢌꢚ ꢇAꢌꢋꢛ  
ꢐꢡꢛꢔꢔꢁ ꢔꢒꢖꢗ ꢐꢡꢛꢔꢔꢈ  
ꢁꢀꢀꢂꢃ  
ꢄꢍ  
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ꢄꢍ  
ꢈꢀꢇ  
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ꢀ.ꢁꢂꢃ  
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ꢅꢢꢌꢀꢈ ꢐAꢀꢁ  
Rev. A  
1
Document Feedback  
For more information www.analog.com  
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