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LTC7840

更新时间： 2024-11-29 02:53:03
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亚德诺 - ADI /
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44页 2904K
描述
2-Phase Dual Output Nonsynchronous Boost Controller with Hiccup Mode

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中文翻译

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LTC7840 数据手册

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LTC7817  
40V, Low I , 3MHz,  
Q
Triple Output Buck/Buck/Boost Synchronous Controller  
FEATURES  
DESCRIPTION  
The LTC®7817 is a high performance triple output (buck/  
buck/boost) synchronous DC/DC switching regulator con-  
troller that drives all N-channel power MOSFET stages.  
Its constant frequency current mode architecture allows  
a phase-lockable switching frequency of up to 3MHz.  
The LTC7817 operates from a wide 4.5V to 40V input  
supply range. When biased from the output of the boost  
converter or another auxiliary supply, the LTC7817 can  
operate from an input supply as low as 1V after start-up.  
n
Dual Buck Plus Single Boost Synchronous Controllers  
n
Low Operating I :  
Q
14μA (14V to 3.3V, Channel 1 On)  
Outputs Remain in Regulation Through Cold Crank  
Down to 1V Input Supply Voltage  
n
n
n
n
n
Wide Bias Input Voltage Range: 4.5V to 40V  
Buck and Boost Output Voltages up to 40V  
R
or DCR Current Sensing  
SENSE  
Pass-Thru™ Operation: 100% Duty Cycle for  
The very low no-load quiescent current extends operating  
run time in battery powered systems. OPTI-LOOP® com-  
pensation allows the transient response to be optimized  
over a wide range of output capacitance and ESR values.  
The LTC7817 features a precision 0.8V reference for the  
bucks, 1.2V reference for the boost and a power good  
output indicator.  
Boost Synchronous MOSFET  
n
n
n
Programmable Fixed Frequency (100kHz to 3MHz)  
Phase-Lockable Frequency (100kHz to 3MHz)  
Selectable Continuous, Pulse-Skipping, or Low  
Ripple Burst Mode Operation at Light Loads  
Very Low Buck Dropout Operation: 99% Duty Cycle  
n
n
n
n
Low Shutdown I : 1.5μA  
Q
Small 38-Lead 5mm × 7mm QFN Package  
The LTC7817 synchronous boost Pass-Thru capability  
minimizes losses in automotive start-stop applications.  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.  
AEC-Q100 Automotive Qualification in Process  
APPLICATIONS  
n
Automotive and Transportation  
n
Industrial  
n
Military/Avionics  
TYPICAL APPLICATION  
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ꢀꢁ  
ꢀꢁꢂꢂꢁꢃꢄ ꢅ ꢀꢁꢂꢃ ꢄ ꢀ ꢁ0ꢂ  
ꢀꢁ ꢀꢁ  
ꢀꢁꢂꢃꢄ  
ꢀ
ꢀꢁꢂ  
ꢀꢀꢁꢂ  
ꢀꢁ0ꢂꢃ  
LTC7817 Response to a Cold  
ꢀꢁꢂ  
ꢀꢁꢂ  
Crank Automotive Waveform  
ꢀꢁꢁꢂꢃꢄ  
ꢀꢁꢁꢂꢃꢄ  
0ꢀꢁꢂꢃ  
ꢀꢁꢂꢃꢄ  
1.5mΩ  
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2mΩ  
0ꢀꢁꢂꢃ  
0ꢀꢁꢂꢃ  
ꢀꢁꢂꢃ  
ꢀꢁꢀꢂ  
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ꢀꢁꢂꢃꢄ ꢅꢃ  
ꢀꢀꢁꢂ  
ꢀꢁꢂ  
ꢀꢁꢂ  
ꢀꢁ0ꢂꢃ  
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ꢀꢁꢂꢂ  
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ꢀ
ꢀꢁꢂꢃ  
ꢄ
ꢄ
ꢀꢁ0ꢂ  
ꢀꢁꢂꢀꢁꢃ  
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ꢀꢁꢂꢀꢁꢃ  
ꢀꢁꢂꢀꢁꢃꢄ  
ꢀ
ꢀꢁꢂ  
ꢀꢁꢂꢃꢄꢅꢆ  
ꢀꢁꢂꢃꢄꢁ  
ꢀ
Rꢀꢁꢂꢃꢄꢃꢅ  
ꢀꢁꢂꢃ  
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ꢀꢁꢂꢃ  
ꢀꢁꢂꢃꢄ  
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ꢁꢂꢃꢄꢅꢄꢆ  
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ꢀꢁꢂꢃ  
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ꢀꢁꢂꢃ  
ꢀꢁꢂ  
ꢀꢀ  
ꢀꢁꢁꢂꢃꢄ  
ꢀ
ꢀꢁꢂꢃ  
ꢀꢁRꢂꢃ  
ꢀꢁꢂꢃꢄ  
0ꢀꢁꢂꢃ  
ꢀ
ꢀꢁꢂꢃꢄ  
ꢀꢁꢂꢃ  
ꢀꢁ  
ꢀ0ꢁ  
3mΩ  
ꢀꢁꢂ  
0ꢀꢁꢂꢃ  
ꢀꢁꢂ  
ꢀꢀ0ꢁꢂ  
ꢀ0ꢁꢂ  
ꢀꢁꢁꢂꢃꢄꢅꢆꢅꢇ  
0ꢀ  
ꢀꢁꢂꢀ ꢃꢄ0ꢂꢅ  
ꢀꢁꢂꢃ ꢄꢅ0ꢆꢇꢈꢉꢁꢊꢋ  
ꢄ
ꢀꢁꢂꢀꢁꢃ  
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ꢀꢁꢁꢂꢃꢄꢅꢆꢇꢈ  
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ꢀꢁꢂꢀꢁꢃ  
ꢀRꢁꢂ  
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ꢀꢁꢂꢃ  
ꢀꢁꢂ  
ꢀꢀ  
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ꢀꢁꢂꢃ  
ꢀꢁꢂꢃ ꢀꢁꢂꢃ  
ꢀꢁꢂꢃꢄ  
ꢀꢁꢂꢀ ꢃꢄ0ꢂꢅ  
Rev 0  
1
Document Feedback  
For more information www.analog.com  
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