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LTC3858-2_15 PDF预览

LTC3858-2_15

更新时间： 2024-02-14 09:47:04
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
40页 442K
描述
Low IQ, Dual 2 Phase Synchronous Step-Down Controller

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LTC3858-2_15 数据手册

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LTC3858-2  
Low I , Dual  
Q
2-Phase Synchronous  
Step-Down Controller  
FEATURES  
DESCRIPTION  
n
Low Operating I : 170μA (One Channel On)  
The LTC®3858-2 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.  
Q
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
n
n
n
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  
Burst Mode® Operation at Light Loads  
The 170ꢀA 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  
LTC3858-2differsfromtheLTC3858byhavingtheovervolt-  
ageprotectioncrowbarandshort-circuitlatchoffdisabled.  
A wide 4V to 38V input supply range encompasses a wide  
rangeofintermediatebusvoltagesandbatterychemistries.  
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  
Low Shutdown I : 8μA  
Q
Internal LDO Powers Gate Drive from V or EXTV  
No Current Foldback During Start-Up  
5mm × 5mm QFN Package  
IN  
CC  
Independent soft-start pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
L,LT,LTC,LTM,BurstMode,OPTI-LOOP,μModule,PolyPhase,LinearTechnologyandtheLinear  
APPLICATIONS  
logoareregisteredtrademarksandNoR  
andUltraFastaretrademarksofLinearTechnology  
SENSE  
Corporation.Allothertrademarksarethepropertyoftheirrespectiveowners.ProtectedbyU.S.  
Patents,including5481178,5705919,5929620,6100678,6144194,6177787,6304066,6580258.  
n
Automotive Systems  
n
Battery Operated Digital Devices  
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
High Efficiency Dual 8.5V/3.3V Step-Down Converter  
Efficiency and Power Loss  
vs Load Current  
V
IN  
9V TO 38V  
22μF  
50V  
100  
90  
10000  
1000  
100  
10  
4.7μF  
V
INTV  
CC  
IN  
TG1  
TG2  
80  
0.1μF  
0.1μF  
EFFICIENCY  
BOOST1  
SW1  
BOOST2  
SW2  
3.3μH  
7.2μH  
70  
60  
50  
POWER LOSS  
BG1  
BG2  
LTC3858-2  
PGND  
40  
30  
20  
10  
0
+
+
SENSE1  
SENSE2  
1
0.01Ω  
193k  
0.007Ω  
V
V
= 12V  
OUT  
FIGURE 13 CIRCUIT  
IN  
–
= 3.3V  
–
V
SENSE2  
OUT2  
SENSE1  
FB1  
V
OUT1  
3.3V  
5A  
8.5V  
3.5A  
V
V
FB2  
0.1  
62.5k  
150μF  
0.0001 0.001  
0.01  
0.1  
1
10  
I
I
TH2  
TH1  
SS1  
680pF  
15k  
680pF  
15k  
OUTPUT CURRENT (A)  
150μF  
SGND  
SS2  
20k  
38582 TA01b  
20k  
0.1μF  
0.1μF  
38582 TA01a  
38582f  
1
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