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LTC3860IUH PDF预览

LTC3860IUH

更新时间： 2024-10-02 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
36页 445K
描述
Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing

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中文翻译

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LTC3860IUH 数据手册

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LTC3860  
Dual, Multiphase Step-Down  
Voltage Mode DC/DC Controller  
with Current Sharing  
FeaTures  
DescripTion  
The LTC®3860 is a dual, PolyPhase® synchronous step-  
down switching regulator controller for high current  
distributed power systems, digital signal processors, and  
othertelecomandindustrialDC/DCpowersupplies.Ituses  
aconstantfrequencyvoltagemodearchitecturecombined  
with very low offset, high bandwidth error amplifiers and  
a remote output sense differential amplifier for excellent  
transient response and output regulation.  
n
Constant Frequency Voltage Mode Control with  
Accurate Current Sharing  
±±0.75 ±0ꢀV Voltage Reference  
n
n
Differential Remote Output Voltage Sense Amplifier  
Multiphase Capability—Up to 12-Phase Operation  
Programmable Current Limit  
n
n
n
n
Safely Powers a Pre-Biased Load  
Programmable or PLL-Synchronizable Switching  
Frequency Up to 1027MHz  
ThecontrollerincorporateslosslessinductorDCRcurrent  
sensingtomaintaincurrentbalancebetweenphasesandto  
provide overcurrent protection. The chip operates from a  
n
Lossless Current Sensing Using Inductor DCR or  
Precision Current Sensing with Sense Resistor  
Fast and Accurate True Operational Error Amplifiers  
n
n
n
n
n
n
n
V
supply between 3V and 5.5V and is designed for step-  
CC  
V
Range: 3V to 5.5V  
CC  
down conversion from V between 3V and 24V to output  
IN  
V Range: 3V to 24V  
IN  
voltages between 0.6V and V – 0.5V.  
CC  
Power Good Output Voltage Monitor  
Output Voltage Tracking Capability  
Programmable Soft-Start  
The TRACK/SS pins provide programmable soft-start or  
tracking functions. Inductor current reversal is disabled  
duringsoft-starttosafelypowerprebiasedloads.Thecon-  
stantoperatingfrequencycanbesynchronizedtoanexter-  
nalclockorlinearlyprogrammedfrom250kHzto1.25MHz.  
Up to six LTC3860 controllers can operate in parallel for  
1-, 2-, 3-, 4-, 6- or 12-phase operation.  
Available in a 32- Pin 5mm × 5mm QFN Package  
applicaTions  
n
High Current Distributed Power Systems  
n
Digital Signal Processor and ASIC Supplies  
n
The LTC3860 is available in a 32-pin 5mm × 5mm QFN  
package.  
Telecom Systems  
Industrial Power Supplies  
n
L, LT, LTC, LTM, PolyPhase, µModule, Linear Technology and the Linear logo are registered  
trademarks and No R  
is a trademark of Linear Technology Corporation. All other  
SENSE  
trademarks are the property of their respective owners. Protected by U.S. Patents, including  
6144194, 5055767  
Typical applicaTion  
V
IN  
TG1  
LTC4449  
GND  
PWM1  
IN  
V
0.3µH  
TG  
TS  
BG  
V
LOGIC  
CC  
BOOST  
CC  
V
IN  
SW1  
V
470µF  
PWM1  
BG1  
VINSNS  
50k  
0.22µF  
V
RUN1,2  
LIM1  
ISNS1P  
ISNS1N  
ISNS2N  
ISNS2P  
V
CC  
CC  
2.32k  
FREQ  
FB2  
I
1µF  
V
1.2V  
50A  
0.22µF  
0.22µF  
PWM2  
OUT  
V
OUT  
I
LIM2  
FB1  
LTC3860  
330µF  
s4  
COMP1,2  
SS1,2  
1nF  
V
IN  
2.32k  
0.3µH  
LTC4449  
33pF  
20k 220Ω  
VSNSOUT  
VSNSN  
VSNSP  
SGND  
PWM2  
IN  
V
V
GND  
TG  
TG2  
V
CC  
LOGIC  
CC  
BOOST  
I
SW2  
AVG  
3860 TA01  
TS  
0.1µF  
20k  
CLKIN  
220pF  
BG  
12.7k  
BG2  
100pF  
0.22µF  
3860f  
ꢀ
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中文翻译

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