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LTC3838

更新时间： 2024-09-28 11:57:43
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
50页 696K
描述
Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

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LTC3838 数据手册

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LTC3839  
Fast, Accurate, 2-Phase,  
Single-Output Step-Down DC/DC  
Controller with Differential Output Sensing  
DESCRIPTION  
FEATURES  
The LTC®3839 is a 2-phase, single-output PolyPhase®  
synchronous step-down switching regulator controller  
that drives all N-channel power MOSFETs. The controlled  
on-time,valleycurrentmodecontrolarchitectureallowsfor  
fast transient response and constant frequency switching  
n
Wide V Range: 4.5V to 38V, V : 0.6V to 5.5V  
IN  
OUT  
n
0.6ꢀ7 Output Voltage Accuracy Over Temperature,  
Differential Output Voltage Sensing, Allowing Up to  
500mV ꢁine ꢁoss at Remote ꢂround  
n
n
n
n
Controlled On-Time, Valley Current Mode Control  
FastꢁoadTransientResponse  
in steady-state operation, independent of V , V  
and  
IN OUT  
DetectTransient(DTR)ReducesV  
Overshoot  
load current. Its load-release transient detection feature  
significantly reduces overshoot at low output voltages.  
OUT  
Frequency Programmable from 200kHz to 2MHz,  
Synchronizable to External Clock  
Differential output voltage sensing, along with a preci-  
sion internal reference, offers an accurate ±±.ꢀ67 output  
regulation,eveniftheremoteoutputgrounddeviatesfrom  
local ground by ±ꢁ±±mV.  
n
n
n
n
n
n
n
t
= 30ns, t  
= 90ns  
ON(MIN)  
OFF(MIN)  
Up to 12-Phase Operation  
R
or Inductor DCR Current Sensing  
SENSE  
Overvoltage Protection and Current Limit Foldback  
Power Good Output Voltage Monitor  
Output Voltage Tracking and Adjustable Soft Start-Up  
Thermally Enhanced 32-Pin (ꢁmm × ꢁmm) QFN  
Package  
Theswitchingfrequencycanbeprogrammedfrom2±±kHz  
to2MHzwithanexternalresistorandcanbesynchronized  
to an external clock. Very low t and t times allow for  
ON  
OFF  
near ±7 and near 1±±7 duty cycles, respectively. Volt-  
age tracking soft start-up and multiple safety features are  
provided.  
APPLICATIONS  
L, LT, LTC, LTM, PolyPhase, OPTI-LOOP, Linear Technology and the Linear logo are  
registered trademarks and Hot Swap and Stage Shedding are trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.  
Patents, including ꢁ481168, ꢁ846ꢁꢁ4, ꢀꢁ8±2ꢁ8, ꢀ3±4±ꢀꢀ, ꢀ46ꢀꢁ89, ꢀ664ꢀ11.  
n
Distributed Power Systems  
Point-of-Load Converters  
n
n
Computing Systems  
n
Data Communication Systems  
TYPICAL APPLICATION  
3.3V/25A Output, 2MHz Step-Down Converter (Refer to Figure 20 for Full Design)  
V
IN  
Efficiency/Power ꢁoss  
4.ꢁV TO 14V  
–
+
–
+
1±  
8
1±±  
9±  
8±  
6±  
ꢀ±  
ꢁ±  
SENSE1  
SENSE1  
SENSE2  
SENSE2  
INTV  
V
IN  
= ꢁV  
DISCONTINUOUS  
MODE  
V
IN  
CC  
TG1  
TG2  
LTC3839  
SW1  
SW2  
FORCED  
±.3μH  
±.3μH  
V
ꢀ
OUT  
CONTINUOUS  
BOOST1  
BOOST2  
3.3V  
2ꢁA  
MODE  
±.1μF  
±.1μF  
4ꢁ.3k  
1±k  
4
+
DRV  
CC2  
DRV  
CC1  
1±±μF  
wꢀ  
BG1  
BG2  
4.6μF  
2
PGND  
LOSS  
FORCED CM  
MODE/PLLIN  
CLKOUT  
PHASMD  
RUN  
LOSS  
DCM  
+
–
V
V
OUTSENSE  
OUTSENSE  
±
1±±  
±.1  
1
1±  
TRACK/SS  
ITH  
LOAD CURRENT (A)  
3839 TA±1b  
18.6k  
DTR  
RT  
SGND  
3839 TA±1a  
3839fa  
1
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