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LTC3834

更新时间： 2024-09-29 14:58:23
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
30页 774K
描述
30μA IQ 同步降压型控制器

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中文翻译

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LTC3834 数据手册

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LTC3834  
30µA I Synchronous  
Q
Step-Down Controller  
FEATURES  
DESCRIPTION  
TheLTC®3834isahighperformancestep-downswitching  
regulator controller that drives an all N-channel synchro-  
nous power MOSFET stage. A constant-frequency current  
mode architecture allows a phase-lockable frequency of  
up to 650kHz.  
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 10V  
OUT  
n
Low Operating Quiescent Current: 30µA  
OPTI-LOOP® Compensation Minimizes C  
±1% Output Voltage Accuracy  
n
n
n
n
n
n
n
n
n
n
n
n
n
n
OUT  
Wide V Range: 4V to 36V  
IN  
Phase-Lockable Fixed Frequency 140kHz to 650kHz  
Dual N-Channel MOSFET Synchronous Drive  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Output Current Foldback Limiting  
The 30µA no-load quiescent current extends operating  
life in battery powered systems. OPTI-LOOP compensa-  
tion allows the transient response to be optimized over  
a wide range of output capacitance and ESR values. The  
LTC3834 features a precision 0.8V reference and a power  
good output indicator. The 4V to 36V input supply range  
encompasses a wide range of battery chemistries.  
Power Good Output Voltage Monitor  
Clock Output for PolyPhase® Applications  
Output Overvoltage Protection  
The TRACK/SS pin ramps the output voltage during  
start-up. Current foldback limits MOSFET heat dissipation  
during short-circuit conditions. A reduced feature set  
version of the part (LTC3834-1) is available in a smaller,  
lower pin count package.  
Low Shutdown I : 4µA  
Q
Internal LDO Powers Gate Drive from V or V  
IN  
OUT  
Selectable Continuous, Pulse Skipping or  
Burst Mode® Operation at Light Loads  
n
Small 20-Lead TSSOP or 4mm × 5mm QFN Package  
Comparison of LTC3834 and LTC3834-1  
CLKOUT/  
APPLICATIONS  
PART #  
PHASMD EXTV  
PGOOD  
Yes  
PACKAGES  
CC  
LTC3834  
LTC3834-1  
Yes  
No  
Yes  
No  
FE20/4mm × 5mm QFN  
GN16/3mm × 5mm DFN  
n
Automotive Systems  
No  
n
Telecom Systems  
L, LT, LTC, LTM, Burst Mode, PolyPhase and OPTI-LOOP are registered trademarks and  
No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents, including 5408150, 5481178,  
5705919, 5929620, 6304066, 6498466, 6580258, 6611131.  
n
Battery-Operated Digital Devices  
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
High Efficiency Synchronous Step-Down Converter  
V
IN  
4V TO 36V  
CLKOUT  
PLLLPF  
RUN  
V
IN  
10000  
1000  
100  
10  
100  
90  
10µF  
TG  
0.01µF  
0.22µF  
PGOOD  
TRACK/SS  
80  
BOOST  
SW  
70  
3.3µH  
V
OUT  
3.3V  
5A  
0.012Ω  
I
TH  
560pF  
54.2k  
60  
50  
LTC3834  
150pF  
150µF  
40  
30  
20  
10  
SGND  
PLLIN/MODE  
INTV  
EXTV  
CC  
CC  
4.7µF  
68.1k  
1
V
BG  
FB  
–
+
SENSE  
SENSE  
0
0.1  
215k  
0.000001  
0.0001  
OUTPUT CURRENT (A)  
0.01  
1
PGND  
3834 TA01b  
3834 TA01  
3834fc  
1
For more information www.linear.com/LTC3834  
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