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LTC3835

更新时间： 2023-12-20 18:46:38
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 799K
描述
低 IQ 同步降压型控制器

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LTC3835 数据手册

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LTC3835  
Low I Synchronous  
Q
Step-Down Controller  
FEATURES  
DESCRIPTION  
The LTC®3835 is a high performance step-down switching  
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: 80µA  
OPTI-LOOP® Compensation Minimizes C  
1% Output Voltage Accuracy  
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
OUT  
Wide V Range: 4V to 36V Operation  
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 80µA 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  
LTC3835 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 dur-  
ing short-circuit conditions.  
Low Shutdown I : 10µA  
Q
Internal LDO Powers Gate Drive from V or V  
IN  
OUT  
Selectable Continuous, Pulse-Skipping or  
Burst Mode® Operation at Light Loads  
Comparison of LTC3835 and LTC3835-1  
CLKOUT/  
Small 20-Lead TSSOP or 4mm × 5mm QFN Package  
AEC-Q100 Qualified for Automotive Applications  
PART #  
PHASMD  
EXTV  
PGOOD  
PACKAGES  
FE20/4 × 5 QFN  
GN16/3 × 5 DFN  
CC  
LTC3835  
LTC3835-1  
YES  
YES  
NO  
YES  
APPLICATIONS  
NO  
NO  
n
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. patents, including 5408150, 5481178, 5705919, 5929620, 6304066, 6498466,  
6580258, 6611131.  
Automotive Systems  
n
Telecom Systems  
n
Battery-Operated Digital Devices  
Distributed DC Power Systems  
n
TYPICAL APPLICATION  
Efficiency and Power Loss  
vs Load Current  
High Efficiency Synchronous Step-Down Converter  
CLKOUT  
V
ꢓꢒꢒꢒꢒꢒ  
ꢓꢒꢒꢒꢒ  
ꢓꢒꢒꢒ  
ꢓꢒꢒ  
IN  
V
IN  
4V TO  
36V  
ꢓꢒꢒ  
ꢜꢒ  
PLLLPF  
RUN  
ꢆFFꢌꢄꢌꢆꢇꢄꢍ  
ꢞ ꢓꢛꢝꢟ ꢝ ꢞ ꢔ.ꢔꢝ  
10µF  
TG  
ꢝ
ꢌꢇ  
ꢁꢅꢈ  
0.01µF  
0.22µF  
ꢕꢒ  
PGOOD  
TRACK/SS  
BOOST  
SW  
ꢚꢒ  
3.3µH  
V
0.012Ω  
OUT  
I
TH  
3.3V  
5A  
ꢙꢒ  
ꢖꢒ  
330pF  
33k  
LTC3835  
100pF  
150µF  
ꢘꢒ  
ꢔꢒ  
ꢛꢒ  
ꢓꢒ  
ꢒ
SGND  
PLLIN/MODE  
INTV  
EXTV  
CC  
ꢏꢁꢐꢆR ꢀꢁꢑꢑ  
ꢓꢒ  
4.7µF  
20k  
CC  
V
BG  
FB  
ꢓ
–
+
SENSE  
SENSE  
62.5k  
ꢒ.ꢓ  
PGND  
ꢒ.ꢒꢒꢓ ꢒ.ꢒꢓ ꢒ.ꢓ  
ꢓ
ꢓꢒ ꢓꢒꢒ ꢓꢒꢒꢒ ꢓꢒꢒꢒꢒ  
ꢀꢁꢂꢃ ꢄꢅRRꢆꢇꢈ ꢉꢊꢂꢋ  
ꢔꢕꢔꢖ ꢈꢂꢒꢓꢗ  
3835 TA01  
Rev. F  
1
Document Feedback  
For more information www.analog.com  
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