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LTC3857-1

更新时间： 2024-09-30 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
38页 423K
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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LTC3857-1 数据手册

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LTC3857-1  
Low I , Dual, 2-Phase  
Q
Synchronous Step-Down  
Controller  
FEATURES  
DESCRIPTION  
The LTC®3857-1 is a high performance dual step-down  
switching regulator controller that drives all N-channel  
synchronouspowerMOSFETstages.Aconstantfrequency  
current mode architecture allows a phase-lockable fre-  
quency of up to 850kHz. Power loss and noise due to the  
ESRoftheinputcapacitorESRareminimizedbyoperating  
the two controller output stages out of phase.  
n
Low Operating I : 50μA (One Channel On)  
Q
n
n
n
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
Wide V Range: 4V to 38V  
IN  
R
or DCR Current Sensing  
SENSE  
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
n
n
n
n
OUT  
Phase-Lockable Frequency (75kHz-850kHz)  
Programmable Fixed Frequency (50kHz-900kHz)  
Selectable Continuous, Pulse-Skipping or Low Ripple  
Burst Mode® Operation at Light Loads  
The 50ꢀA no-load quiescent current extends operating life  
in battery-powered systems. The LTC3857-1 features a  
precision0.8Vreferenceandapowergoodoutputindicator.  
A wide 4V to 38V input supply range encompasses a wide  
rangeofintermediatebusvoltagesandbatterychemistries.  
n
n
n
n
n
n
n
n
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Power Good Output Voltage Monitor  
Independent TRACK/SS pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
The PLLIN/MODE pin selects among Burst Mode opera-  
tion,pulse-skippingmode,orcontinuousinductorcurrent  
mode at light loads.  
Output Overvoltage Protection  
Low Shutdown I : <8μA  
Internal LDO Powers Gate Drive from V or EXTV  
No Current Foldback During Start-Up  
Narrow SSOP Package  
Q
IN  
CC  
For a leadless 32-pin QFN package with the additional fea-  
tures of adjustable current limit, clock out, phase modula-  
tionandtwoPGOODoutputs,seetheLTC3857datasheet.  
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, μModule, Linear Technology and the Linear logo  
APPLICATIONS  
n
Automotive Always-On Systems  
Battery Operated Digital Devices  
n
are registered trademarks and No R  
and UltraFast are trademarks of Linear Technology  
SENSE  
n
Distributed DC Power Systems  
Corporation. All other trademarks are the property of their respective owners. Protected by  
U.S. Patents, including 5481178, 5929620, 6177787, 6144194, 5408150, 6580258, 5705919,  
6100678.  
TYPICAL APPLICATION  
High Efficiency Dual 3.3V/8.5V Step-Down Converter  
V
Efficiency and Power Loss  
IN  
9V TO 38V  
22μF  
50V  
vs Output Current  
1μF  
100  
90  
10000  
1000  
100  
10  
V
IN  
INTV  
CC  
V
V
= 12V  
IN  
OUT  
TG1  
TG2  
= 3.3V  
0.1μF  
0.1μF  
FIGURE 13 CIRCUIT  
BOOST1  
SW1  
BOOST2  
SW2  
80  
3.3μH  
7.2μH  
70  
BG1  
BG2  
60  
50  
LTC3857-1  
PGND  
+
+
40  
30  
20  
10  
0
SENSE1  
SENSE1  
SENSE2  
0.010Ω  
193k  
0.007Ω  
1
–
–
V
8.5V  
3.5A  
SENSE2  
OUT2  
V
OUT1  
3.3V  
5A  
V
V
FB1  
FB2  
62.5k  
I
I
TH2  
TH1  
TRACK/SS1 SGND TRACK/SS2  
0.1μF  
0.1  
150μF  
680pF  
15k  
680pF  
150μF  
0.000010.0001 0.001 0.01  
0.1  
1
10  
20k  
OUTPUT CURRENT (A)  
20k  
15k  
0.1μF  
3857 TA01b  
38571 TA01  
38571fc  
1
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