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LTC3838-1

更新时间： 2024-09-28 12:00:39
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
52页 5344K
描述
Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing

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LTC3838-1 数据手册

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LTC3838-1  
Dual, Fast, Accurate  
Step-Down DC/DC Controller with  
Dual Differential Output Sensing  
DESCRIPTION  
FEATURES  
Wide V Range: 4.5V to 38V, V : 0.6V to 5.5V  
The LTC®3838-1 is a dual-channel, PolyPhase® syn-  
chronousstep-downDC/DCswitchingregulatorcontroller.  
Two independent channels drive all N-channel power  
MOSFETs. The controlled on-time, valley current mode  
control architecture allows for not only fast response to  
transientswithoutclockdelay,butalsoconstantfrequency  
switching at steady load condition. Its proprietary load-  
release transient detection feature (DTR) significantly  
reduces overshoot at low output voltages.  
n
IN  
OUT  
n
n
Two Independent Channels: Dual/Single Output  
Output Voltage Regulation Accuracy: 0.6ꢀ7  
(V ) and 0.ꢀ57 (V  
OUT1  
) Over Temperature  
OUT2  
n
Differential Remote Output Sensing: Up to 500mV  
(V ) and 200mV (V ) Ground Deviations  
OUT1  
OUT2  
n
n
n
Controlled On-Time, Valley Current Mode Control  
FastLoadTransientResponseWithoutClockDelay  
DetectTransientRelease(DTR)ReducesV  
Overshoot  
Frequency Programmable from 200kHz to 2MHz,  
Synchronizable to External Clock  
OUT  
Aprecisioninternalreferenceenablesaccuratedifferential  
output regulation. The dual channels can either provide  
two independent output voltages, or be combined into  
multiphase single-output configuration.  
n
n
n
n
n
n
n
t
= 30ns, t  
= 90ns  
ON(MIN)  
OFF(MIN)  
R
SENSE  
or Inductor DCR Current Sensing  
Theswitchingfrequencycanbeprogrammedfrom200kHz  
to2MHzwithanexternalresistorandcanbesynchronizedto  
anexternalclock.Very lowt andt timesallowfornear  
Overvoltage Protection and Current Limit Foldback  
Power Good Output Voltage Monitor  
Output Voltage Tracking and Adjustable Soft Start-Up  
Thermally Enhanced 38-Pin (5mm × 7mm) QFN Package  
ON  
OFF  
0%andnear100%dutycycles,respectively.Voltagetrack-  
ingsoftstart-upandmultiplesafetyfeaturesareprovided.  
APPLICATIONS  
See Table 1 for a comparison of LTC3838, LTC3838-1 and  
LTC3838-2.  
L, LT, LTC, LTM, PolyPhase, OPTI-LOOP, Linear Technology and the Linear logo are registered  
trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks  
are the property of their respective owners. Protected by U.S. Patents, including 5481178,  
5847554, 6580258, 6304066, 6476589, 6774611.  
n
Distributed Power Systems; Power Supply for ASIC  
n
Computing, Data Storage, Communication Systems  
Low Voltage, High Current, and/or High Step-Down Ratio  
n
Converters That Demand Tight Load Transient Regulation  
TYPICAL APPLICATION  
1.2V/1.5V, 15A, 350kHz Step-Down Converter (Refer to Figure 16 for Complete Design)  
V
IN  
Efficiency/Power Loss  
4.5V TO 38V  
2.5  
2.0  
1.5  
1.0  
0.5  
0
–
+
–
+
100  
90  
80  
70  
60  
50  
40  
SENSE1  
SENSE1  
SENSE2  
SENSE2  
INTV  
FORCED CONTINUOUS MODE  
DISCONTINUOUS MODE  
V
IN  
CC  
TG1  
TG2  
LTC3838-1  
SW1  
SW2  
0.56µH  
0.56µH  
15k  
V
1.5V  
15A  
V
OUT2  
OUT1  
1.2V  
15A  
EFFICIENCY  
BOOST1  
BOOST2  
POWER  
LOSS  
0.1µF  
0.1µF  
10k  
+
+
DRV  
CC2  
DRV  
CC1  
330µF  
×2  
330µF  
×2  
BG1  
BG2  
10k/ 10k  
15k  
4.7µF  
10k  
EXTV  
CC  
PGND  
V
V
= 12V  
IN  
OUT  
+
+
–
= 1.2V  
V
V
V
OUTSENSE1  
DFB2  
–
V
OUTSENSE1  
DFB2  
0.1  
1
10  
TRACK/SS1 TRACK/SS2  
LOAD CURRENT (A)  
ITH1  
ITH2  
38381 TA01b  
115k  
RT  
SGND  
MODE_PLLIN  
CLKOUT  
V
PHASMD  
RUN2  
RNG  
RUN1  
38381 TA01a  
38381f  
1
For more information www.linear.com3838-1  
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