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LTC2978ACUPPBF PDF预览

LTC2978ACUPPBF

更新时间： 2024-11-23 12:00:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
80页 891K
描述
8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement

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LTC2978ACUPPBF 数据手册

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LTC2978A  
8-Channel PMBus Power  
System Manager Featuring Accurate  
Output Voltage Measurement  
DescripTion  
FeaTures  
n
Sequence,Trim, Margin and Supervise Eight Power Supplies The LTC®2978A is an 8-channel Power System Manager  
n
n
n
n
n
n
Manage Faults, Monitor Telemetry and Create Fault Logs  
PMBus Compliant Command Set  
used to sequence, trim (servo), margin, supervise, man-  
age 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 overvoltage  
and undervoltage threshold limits for eight power supply  
output channels and one power supply input channel, as  
well as over and under temperature limits. Programmable  
faultresponsescandisablethepowersupplieswithoptional  
retry after a fault is detected. Faults that disable a power  
supplycanautomaticallytriggerblackboxEEPROMstorage  
of fault status and associated telemetry. An internal 16-bit  
ADC monitors eight output voltages, one input voltage,  
and die temperature. In addition, odd numbered chan-  
nels can be configured to measure the voltage across a  
current sense resistor. A programmable watchdog timer  
monitorsmicroprocessoractivityforastalledconditionand  
resets the microprocessor if necessary. A single wire bus  
synchronizes power supplies across multiple LTC power  
system management devices. Configuration EEPROM sup-  
ports autonomous operation without additional software.  
Supported by LTpowerPlay™ GUI  
Margin or Trim Supplies to 0.25% Accuracy  
Fast OV/UV Supervisors per Channel  
Coordinate Sequencing and Fault Management  
Across Multiple Chips  
n
n
n
n
Automatic Fault Logging to Internal EEPROM  
Operate Autonomously without Additional Software  
Internal Temperature and Input Voltage Supervisors  
Accurate Monitoring of Eight Output Voltages, Input  
Voltage and Internal Die Temperature  
2
n
n
n
n
n
I C/SMBus Serial Interface  
Can Be Powered from 3.3V, or 4.5V to 15V  
Programmable Watchdog Timer  
100% Compatible with the LTC2978  
Available in 64-pin 9mm × 9mm QFN Package  
applicaTions  
n
Computers and Network Servers  
Industrial Test and Measurement  
High Reliability Systems  
Medical Imaging  
Video  
n
n
L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks and  
LTpowerPlay ia a trademark of Linear Technology Corporation. All other trademarks are the property  
of their respective owners. Protected by U.S. Patents including 7382303, 7420359 and 7940091.  
n
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Typical applicaTion  
Typical ADC Total Unadjusted  
Error vs Temperature  
8-Channel PMBus Power System Manager  
0.035  
V
4.5V < V  
IBUS  
< 15V**  
IN  
ADC V = 1.8V  
IN  
0.030  
0.025  
V
V
V
IN_SNS  
V
PWR  
OUT  
3.3V**  
V
DIGITALLY  
DD33  
DACP0  
MANAGED  
POWER  
V
R30  
SENSEP0  
TO INTERMEDIATE  
BUS CONVERTER ENABLE  
V
IN_EN  
R20  
R10  
SUPPLY  
0.020  
0.015  
0.010  
0.005  
LTC2978A*  
V
SDA  
LOAD  
FB  
SCL  
V
PMBus  
INTERFACE  
DACM0  
ALERTB  
V
SENSEM0  
SGND  
CONTROL0  
WP  
V
RUN/SS  
OUT_EN0  
GND  
WRITE-PROTECT  
PWRGD  
TO µP RESETB INPUT  
WDI/RESETB  
ASEL0  
WATCHDOG  
0
–50  
–5  
25 40 55 70 85 100  
–35 –20  
10  
TIMER INTERRUPT  
FAULTB00  
TO/FROM OTHER  
LTC2978s  
TEMPERATURE (°C)  
SHARE_CLK  
ASEL1  
*SOME DETAILS OMITTED FOR CLARITY  
ONLY ONE OF EIGHT CHANNELS SHOWN  
2978a TA01b  
GND  
2978a TA01a  
**LTC2978A MAY BE POWERED FROM EITHER AN  
EXTERNAL 3.3V SUPPLY OR THE INTERMEDIATE BUS  
2978af  
1
For more information www.linear.com/LTC2978A  
1234567...80

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