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LTC3811EUHF-PBF PDF预览

LTC3811EUHF-PBF

更新时间： 2024-09-25 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
48页 537K
描述
High Speed Dual, Multiphase Step-Down DC/DC Controller

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LTC3811EUHF-PBF 数据手册

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LTC3811  
High Speed Dual,  
Multiphase Step-Down DC/DC  
Controller  
FEATURES  
DESCRIPTION  
The LTC®3811 is a dual, PolyPhase® synchronous step-  
down switching regulator controller optimized for output  
■
Fixed Frequency, Peak Current Mode Control  
■
±±0.5 Output ꢀccuracy Oꢁer Temperature  
■
Optimized for Low V  
ꢀpplications (Up to 303V)  
voltages up to 3.3V. The LTC3811 includes high bandwidth  
error amplifiers as well as a high speed differential remote  
sense amplifier. The sense voltage range is programmable  
from24mVto85mV,allowingtheuseofeithertheinductor  
DCR or a discrete sense resistor. Multiphase operation is  
made possible using the MODE/SYNC input, the CLKOUT  
output and the PHASEMODE control pin, allowing 1-, 2-,  
3-, 4-, 6- or 12-phase operation.  
OUT  
■
■
■
■
■
Dual or Single Output, Multiphase Operation  
Wide V Range: 40.V to 3±V Operation  
IN  
High Speed Differential Remote Sense ꢀmplifier  
Inductor DCR or Sense Resistor Capable  
ꢀdjustable Peak Current Sense Voltage:  
24mV to 8.mV  
■
■
■
■
■
■
■
■
■
Very Low Duty Cycle Operation: t  
Powerful Internal Gate Drivers  
Output Voltage Soft-Start, Tracking and Sequencing  
Programmable Load Line for Reduced C  
= 6.ns (Typ)  
ON(MIN)  
Large internal gate drivers minimize switching losses and  
allow the use of multiple power MOSFETs connected in  
parallel for high current applications.  
OUT  
Clock Input and Output for Up to 12-Phase Operation  
Fixed Frequency Operation from 250kHz to 750kHz  
PLL Synchronization from 150kHz Up to 900kHz  
Selectable CCM or DCM Operation  
TheoperatingfrequencyoftheLTC3811canbeprogrammed  
from 250kHz to 750kHz and can also be synchronized to  
an external clock using the internal PLL.  
Available in 5mm × 7mm QFN and G36 Packages  
Tracking and sequencing are possible with the LTC3811,  
and soft-start is programmed with an external capacitor.  
Shutdown reduces supply current to 20μA.  
, LT, LTC, LTM and PolyPhase are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 5481178, 6304066, 5929620, 6177787, 6144194,  
6580258, 5705919.  
APPLICATIONS  
■
Network Servers  
■
High Current ASIC Supplies  
■
Low Voltage Power Distribution  
TYPICAL APPLICATION  
Dual Output, 2-Phase Tracking Core and I/O Supply  
V
IN  
Load Step  
4.5V TO 14V  
V
INTV  
DRV  
IN  
CC  
CC  
TG2  
TG1  
V
OUT  
100mV/DIV  
BOOST1  
SW1  
BOOST2  
SW2  
BG1  
BG2  
RUN1  
RUN2  
PGND  
LTC3811  
+
+
SENSE1  
SENSE2  
I
L
–
–
5A/DIV  
SENSE1  
RNG1  
SENSE2  
+
DIFF/IN  
–
DIFF/IN  
RNG2  
FB1  
DIFF/OUT  
FB2  
V
OUT1  
2V  
15A  
3811 TA01b  
V
1.5V  
15A  
OUT2  
V
V
= 12V  
20μs/DIV  
IN  
COMP1  
COMP2  
= 2V  
OUT  
OUT  
SS/TRACK1 SGND SS/TRACK2  
I
= 0A to 12.5A  
3811 TA01a  
3811f  
1
1234567...48

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