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LTC2974

更新时间： 2023-12-20 18:44:42
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
104页 1928K
描述
具有精确输出电流的4通道PMBus电源系统管理器

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中文翻译

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LTC2974 数据手册

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LTC2974  
4-Channel PMBus Power System Manager  
Featuring Accurate Output Current Measurement  
FEATURES  
DESCRIPTION  
n
Sequence, Trim, Margin and Supervise Four Power  
TheLTC®2974isa4-channelPowerSystemManagerused  
to sequence, trim (servo), margin, supervise, manage  
faults, provide telemetry and create fault logs. PMBus  
commands support power supply sequencing, precision  
point-of-load voltage adjustment and margining. DACs  
use a proprietary soft-connect algorithm to minimize  
supply disturbances. Supervisory functions include over  
and under current, voltage and temperature threshold  
limits for four power supply output channels as well as  
over and under voltage threshold limits for a single power  
supply input channel. Programmable fault responses  
can disable the power supplies with optional retry after a  
fault is detected. Faults that disable a power supply can  
automatically trigger black box EEPROM storage of fault  
status and associated telemetry. An internal 16-bit ADC  
monitors four output voltages, four output currents, four  
external temperatures, one input voltage and die tempera-  
ture. Output power is also calculated. A programmable  
watchdog timer monitors microprocessor activity for a  
stalled condition and resets the microprocessor if neces-  
sary.Asinglewirebussynchronizespowersuppliesacross  
multiple LTC Power System Management (PSM) devices.  
Configuration EEPROM with ECC supports autonomous  
operation without additional software.  
Supplies  
n
n
n
n
n
n
n
Manage Faults, Monitor Telemetry and Create Fault Logs  
PMBus™ Compliant Command Set  
Supported by LTpowerPlay® GUI  
Margin or Trim Supplies to within 0.25% of Target  
Fast OV/UV Supervisors Per Channel  
Fast Output Current Supervisors Per Channel  
Coordinate Sequencing and Fault Management  
Across Multiple LTC PSM Devices  
n
n
n
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Automatic Fault Logging to Internal EEPROM  
Operate Autonomously without Additional Software  
External Temperature and Input Voltage Supervisors  
Accurate Monitoring of Four Output Voltages, Four  
Output Currents, Four External Temperatures, Input  
Voltage and Internal Die Temperature  
2
n
n
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I C/SMBus Serial Interface  
Can Be Powered from 3.3V, or 4.5V to 15V  
Available in 64-Lead 9mm × 9mm QFN Package  
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
Computers and Network Servers  
n
Industrial Test and Measurement  
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High Reliability Systems  
Medical Imaging  
Video  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. patents, including 7382303, 7420359 and 7940091.  
n
n
TYPICAL APPLICATION  
4-Channel PMBus Power System Manager  
ADC Total Unadjusted Error  
vs Temperature  
IBC  
4.5V ≤ V  
IBUS  
≤ 15V  
0.07  
DC  
IN  
IN OUT  
V
0.06  
0.05  
I
IN  
SENSEP  
V
V
OUT  
IN_SNS  
DC/DC  
CONVERTER  
RUN  
FB  
0.04  
0.03  
0.02  
0.01  
0
* LTC2974 MAY ALSO BE  
V
V
V
*
I
V
PWR  
SENSEM  
POWERED DIRECTLY FROM  
AN EXTERNAL 3.3V SUPPLY  
*
DD33  
SENSEP  
LTC2974  
LOAD  
V
R20  
SENSEM  
SDA  
SCL  
ALERTB  
CONTROL  
FAULT  
PWRGD  
PMBus  
INTERFACE  
V
DAC  
–0.01  
–0.02  
–0.03  
R30  
R10  
THREE TYPICAL PARTS  
–50 –25 25  
TEMPERATURE (°C)  
V
OUT_EN  
0
100  
50  
75  
T
SENSE  
MMBT3906  
2974 TA01b  
NOTE: SOME DETAILS OMITTED FOR CLARITY  
ONLY ONE OF FOUR CHANNELS SHOWN  
Rev. F  
1
Document Feedback  
For more information www.analog.com  
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