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LTC3875IUH#PBF

更新时间： 2024-01-07 11:29:39
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
46页 761K
描述
LTC3875 - Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation; Package: QFN; Pins: 40; Temperature Range: -40°C to 85°C

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LTC3875IUH#PBF 技术参数

是否Rohs认证： 符合生命周期：Active
零件包装代码：QFN包装说明：5 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-40
针数：40Reach Compliance Code：compliant
风险等级：2.26Base Number Matches：1

LTC3875IUH#PBF 数据手册

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LTC3875  
Dual, 2-Phase, Synchronous  
Controller with Low Value DCR Sensing  
and Temperature Compensation  
FEATURES  
DESCRIPTION  
The LTC®3875 is a dual output current mode synchronous  
n
Low Value DCR Current Sensing  
Programmable DCR Temperature Compensation  
0.ꢀ5 0.6V Output Voltage Accuracy  
Dual True Remote Sensing Differential Amplifiers  
Optional Fast Transient Operation  
n
step-down DC/DC controller that drives all N-channel  
synchronous power MOSFET stages. It employs a unique  
architecture which enhances the signal-to-noise ratio of  
the current sense signal, allowing the use of very low DC  
resistance power inductors to maximize the efficiency in  
high current applications. This feature also reduces the  
switching jitter commonly found in low DCR applications.  
n
n
n
n
n
Phase-Lockable Fixed Frequency 2ꢀ0kHz to 720kHz  
Dual, 180° Phased Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
Dual N-Channel MOSFET Synchronous Drive  
n
n
n
TheLTC3875featurestwohighspeedremotesensediffer-  
ential amplifiers, programmable current sense limits from  
10mVto30mVandDCRtemperaturecompensationtolimit  
the maximum output current precisely over temperature.  
Wide V Range: 4.5V to 38V Operation  
IN  
Output Voltage Range with Low DCR: 0.6V to 3.5V,  
without Low DCR: 0.6V to 5V  
n
n
n
n
n
n
n
Adjustable Soft-Start Current Ramping or Tracking  
Foldback Output Current Limiting  
Clock Input and Output for Up to 12-Phase Operation  
Short-Circuit Soft Recovery  
Output Overvoltage Protection  
Power Good Output Voltage Monitor  
40-Lead QFN Packages  
Auniquethermalbalancingfunctionadjustsperphasecur-  
rent in order to minimize the thermal stress for multichip  
single output applications. The LTC3875 also features a  
precise0.6Vreferencewithguaranteedaccuracyof 0.5ꢀ  
thatprovidesanaccurateoutputvoltagefrom0.6Vto3.5V.  
A 4.5V to 38V input voltage range allows it to support a  
wide variety of bus voltages. The LTC3875 is available  
in a low profile 40-lead 6mm × 6mm (0.5mm pitch) and  
40-lead 5mm × 5mm (0.4mm pitch) QFN packages.  
L, LT, LTC, LTM, Linear Technology, the Linear logo OPTI-LOOP, Burst Mode and PolyPhase  
APPLICATIONS  
n
Servers and Instruments  
n
are registered trademarks and No R  
is a trademark of Linear Technology Corporation.  
Telecom Systems  
SENSE  
All other trademarks are the property of their respective owners. Protected by U.S. Patents  
including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.  
n
DC Power Distribution Systems  
TYPICAL APPLICATION  
High Efficiency Dual Phase 1.2V/60A Step-Down Converter  
V
IN  
6V TO 14V  
22µF  
Efficiency and Power Loss  
vs Load Current  
INTV  
CC  
16V ×4  
4.7µF  
V
INTV  
CC  
PHASMD  
CLKOUT  
PGOOD  
IFAST  
IN  
(OPTIONAL)  
(OPTIONAL)  
RUN1,2  
ILIM  
ENTMPB  
TG1  
100  
95  
90  
85  
80  
75  
70  
14  
12  
10  
8
12V  
IN  
1.8V  
O
~400kHz  
CCM  
THERMAL  
SENSOR  
THERMAL  
SENSOR  
MODE/PLLIN  
TG2  
0.3µH  
0.3µH  
(0.32mΩ DCR)  
BOOST1  
BOOST2  
SW2  
(0.32mΩ DCR)  
LTC3875  
CC  
SW1  
EXTV  
BG1  
BG2  
TAVG  
PGND  
6
TRSET1  
TRSET2  
+
SNSA1  
SNS1  
SNSD1  
+
SNSA2  
–
4
–
SNS2  
0.32mΩ  
1.5mΩ  
0.32mΩ PLOSS  
1.5mΩ PLOSS  
+
+
SNSD2  
2
TCOMP1  
TCOMP2  
+
–
V
V
OUT  
OSNS1  
OSNS1  
TH1  
V
1.2V  
60A  
FREQ  
20k  
OUT  
+
V
0
V
V
OSNS2  
OSNS2  
I
0
20  
30  
40  
50  
60  
10  
–
I
+
470µF  
2.5V ×2  
SP  
LOAD CURRENT (A)  
1500pF  
122k 15k  
TK/SS1 TK/SS2  
TH2  
+
470µF  
2.5V ×2  
20k  
3875 TA01b  
0.1µF  
SP  
3875 TA01a  
3875fb  
1
For more information www.linear.com/LTC3875  
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