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LTC3868

更新时间： 2024-09-20 14:58:19
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 396K
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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LTC3868 数据手册

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LTC3868  
Low I , Dual  
Q
2-Phase Synchronous  
Step-Down Controller  
FEATURES  
DESCRIPTION  
The LTC®3868 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  
input capacitor ESR are minimized by operating the two  
controller outputs out of phase.  
n
Low Operating I : 170µA (One Channel On)  
Q
n
n
n
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 14V  
OUT  
Wide V Range: 4V to 24V  
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 to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Selectable Continuous, Pulse-Skipping or  
Burst Mode® Operation at Light Loads  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start  
The170μAno-loadquiescentcurrentextendsoperatinglifein  
battery-poweredsystems.OPTI-LOOPcompensationallows  
the transient response to be optimized over a wide range of  
outputcapacitanceandESRvalues. TheLTC3868featuresa  
precision0.8Vreferenceandapowergoodoutputindicator.  
A wide 4V to 24V input supply range encompasses a wide  
range of intermediate bus voltages and battery chemistries.  
n
n
n
n
n
n
n
n
n
Power Good Output Voltage Monitor  
Output Overvoltage Protection  
Independent soft-start pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
The output short-circuit latchoff feature further protects  
the circuit in short-circuit conditions.  
Output Latchoff Protection During Short Circuit  
Low Shutdown I : 8µA  
Q
Internal LDO Powers Gate Drive from V or EXTV  
IN  
CC  
No Current Foldback During Start-Up  
Small 5mm × 5mm QFN Package  
For a leaded 28-lead SSOP package with a fixed current  
limit and one PGOOD output, without phase modulation  
or a clock output, see the LTC3868-1 data sheet.  
APPLICATIONS  
n
Notebook and Palmtop Computers  
n
Portable Instruments  
Battery Operated Digital Devices  
L,LT,LTC,LTM,BurstMode,OPTI-LOOP,PolyPhase,µModule,LinearTechnologyandtheLinear  
logoareregisteredtrademarksandNoR  
andUltraFastaretrademarksofLinearTechnology  
SENSE  
n
Corporation.Allothertrademarksarethepropertyoftheirrespectiveowners. ProtectedbyU.S.  
Patents,including5481178,5705919,5929620,6100678,6144194,6177787,6304066,6580258.  
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
High Efficiency Dual 8.5V/3.3V Step-Down Converter  
V
Efficiency and Power Loss  
IN  
9V TO 24V  
22µF  
50V  
vs Load Current  
4.7µF  
V
INTV  
CC  
100  
90  
10000  
1000  
100  
10  
IN  
TG1  
TG2  
0.1µF  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
3.3µH  
7.2µH  
80  
EFFICIENCY  
70  
BG1  
BG2  
60  
50  
LTC3868  
POWER LOSS  
PGND  
+
+
40  
30  
20  
10  
0
SENSE1  
SENSE1  
SENSE2  
0.01Ω  
193k  
0.007Ω  
–
1
–
V
8.5V  
3.5A  
SENSE2  
OUT2  
V
V
V
= 12V  
OUT1  
3.3V  
5A  
IN  
V
V
FB1  
FB2  
= 3.3V  
OUT  
FIGURE 12 CIRCUIT  
62.5k  
I
I
TH2  
TH1  
SS1  
0.1  
150µF  
680pF  
15k  
680pF  
150µF  
SGND  
SS2  
0.0001 0.001  
0.01  
0.1 10  
1
20k  
OUTPUT CURRENT (A)  
20k  
15k  
0.1µF  
0.1µF  
3868 TA01b  
3868 TA01  
3868fe  
1
For more information www.linear.com/LTC3868  
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