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LTC3827

更新时间： 2024-09-24 14:57:59
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
36页 622K
描述
低IQ、双通道、两相同步降压型控制器

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中文翻译

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LTC3827 数据手册

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LTC3827  
Low I , Dual, 2-Phase  
Q
Synchronous Step-Down Controller  
FEATURES  
DESCRIPTION  
The LTC®3827 is a high performance dual step-down  
switching regulator controller that drives all N-channel  
synchronouspowerMOSFETstages.Aconstantfrequency  
currentmodearchitectureallowsaphase-lockablefrequen-  
cy of up to 650kHz. Power loss and noise due to the ESR  
of the input capacitor ESR are minimized by operating the  
two controller output stages out of phase.  
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 10V  
OUT  
n
Low Operating I : 80µA (One Channel On)  
Out-of-Phase Controllers Reduce Required Input  
Q
n
Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
n
n
n
n
n
OUT  
1ꢀ Output Voltage Accuracy  
Wide V Range: 4V to 36V Operation  
IN  
Phase-Lockable Fixed Frequency 140kHz to 650kHz  
Selectable Continuous, Pulse Skipping or Low Ripple  
Burst Mode® Operation at Light Loads  
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  
LTC3827 features a precision 0.8V reference and a power  
goodoutputindicator. Awide4Vto36Vinputsupplyrange  
encompasses all battery chemistries.  
n
n
n
n
n
n
n
n
n
n
Dual N-Channel MOSFET Synchronous Drive  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Output Current Foldback Limiting  
Power Good Output Voltage Monitor  
Output Overvoltage Protection  
Independent TRACK/SS pins for each controller ramp the  
output voltage during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
Low Shutdown I : 8µA  
Q
Internal LDO Powers Gate Drive from V or V  
IN  
OUT  
The PLLIN/MODE pin selects among Burst Mode opera-  
tion, pulse skipping mode, or continuous inductor cur-  
rent mode at light loads. For a leaded package version  
(28-lead SSOP), see the LTC3827-1 datasheet.  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. Patents including 5481178, 5929620, 6177787, 6144194, 5408150, 6580258, 6304066,  
570919.  
Small 5mm × 5mm QFN Package  
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
Automotive Systems  
Battery-Operated Digital Devices  
Distributed DC Power Systems  
n
n
TYPICAL APPLICATION  
High Efficiency Dual 8.5V/3.3V Step-Down Converter  
Efficiency and Power Loss  
vs Load Current  
V
IN  
4V TO 36V  
+
22µF  
50V  
ꢔꢓꢓꢓꢓꢓ  
ꢔꢓꢓꢓꢓ  
ꢔꢓꢓꢓ  
ꢔꢓꢓ  
ꢔꢓꢓ  
ꢝꢓ  
1µF  
4.7µF  
ꢆꢌꢌꢍꢄꢍꢆꢇꢄꢎ  
V
IN  
INTV  
CC  
ꢞ
ꢟ ꢔꢗꢞꢠ ꢞ  
ꢟ ꢕ.ꢕꢞ  
ꢍꢇ  
ꢁꢅꢈ  
TG1  
TG2  
ꢖꢓ  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
ꢘꢓ  
7.2µH  
3.3µH  
0.1µF  
ꢜꢓ  
ꢛꢓ  
BG1  
BG2  
LTC3827  
PGND  
ꢚꢓ  
ꢕꢓ  
ꢗꢓ  
ꢔꢓ  
ꢓ
ꢐꢁꢑꢆR ꢀꢁꢒꢒ  
ꢔꢓ  
+
+
SENSE1  
SENSE2  
0.015Ω  
0.015Ω  
ꢔ
–
–
SENSE2  
SENSE1  
ꢌꢍGꢅRꢆ ꢔꢕ ꢄꢍRꢄꢅꢍꢈ  
V
V
8.5V  
3.5A  
OUT1  
3.3V  
5A  
OUT2  
ꢓ.ꢔ  
V
V
FB1  
FB2  
ꢓ.ꢓꢓꢔ ꢓ.ꢓꢔ ꢓ.ꢔ  
ꢔ
ꢔꢓ ꢔꢓꢓ ꢔꢓꢓꢓ ꢔꢓꢓꢓꢓ  
62.5k  
192.5k  
I
I
TH2  
TH1  
TRACK/SS1 SGND TRACK/SS2  
0.1µF  
ꢀꢁꢂꢃ ꢄꢅRRꢆꢇꢈ ꢉꢊꢂꢋ  
220pF  
15k  
220pF  
15k  
150µF  
150µF  
ꢕꢖꢗꢘ ꢈꢂꢓꢔꢙ  
20k  
20k  
0.1µF  
3827 TA01  
Rev. G  
1
Document Feedback  
For more information www.analog.com  
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