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LTC2977CUPPBF PDF预览

LTC2977CUPPBF

更新时间： 2024-01-09 13:46:44
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
92页 927K
描述
8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement

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LTC2977CUPPBF 数据手册

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LTC2977  
8-Channel PMBus Power  
System Manager Featuring Accurate  
Output Voltage Measurement  
FeaTures  
DescripTion  
The LTC®2977 is an 8-channel Power System Manager  
used to sequence, trim (servo), margin, supervise, man-  
n
Sequence, Trim, Margin and Supervise Eight Power  
Supplies  
n
n
n
n
n
n
Manage Faults, Monitor Telemetry and Create Fault Logs age faults, provide telemetry and create fault logs. PMBus  
PMBus Compliant Command Set  
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  
commands support power supply sequencing, precision  
point-of-loadvoltageadjustmentandmargining.DACsuse  
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 channels  
can be configured to measure the voltage across a current  
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% Pin-Compatible Upgrade to the LTC2978/LTC2978A sense resistor. A programmable watchdog timer moni-  
Available in 64-pin 9mm × 9mm QFN Package  
tors microprocessor activity for a stalled condition and  
resets the microprocessor if necessary. A single wire bus  
synchronizes power supplies across multiple LTC power  
systemmanagementdevices.ConfigurationEEPROMsup-  
ports autonomous operation without additional software.  
L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks  
and LTpowerPlay is 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.  
applicaTions  
n
Computers and Network Servers  
n
Industrial Test and Measurement  
n
High Reliability Systems  
Medical Imaging  
Video  
n
n
Typical applicaTion  
8-Channel PMBus Power System Manager  
Typical ADC Total Unadjusted  
Error vs Temperature  
V
4.5V < V  
IBUS  
< 15V**  
IN  
0.25  
V
V
V
IN_SNS  
V
PWR  
OUT  
DIGITALLY  
V
= 1.8V  
SENSEP0  
3.3V**  
0.20 THREE TYPICAL PARTS  
V
DD33  
DACP0  
MANAGED  
POWER  
V
R30  
SENSEP0  
0.15  
0.10  
TO INTERMEDIATE  
V
IN_EN  
BUS CONVERTER ENABLE  
R20  
R10  
SUPPLY  
LTC2977*  
V
SDA  
LOAD  
FB  
0.05  
SCL  
V
PMBus  
INTERFACE  
DACM0  
0
ALERTB  
V
SENSEM0  
SGND  
–0.05  
–0.10  
–0.15  
–0.20  
–0.25  
CONTROL0  
V
RUN/SS  
OUT_EN0  
GND  
WRITE-PROTECT  
WP  
PWRGD  
TO µP RESETB INPUT  
WDI/RESETB  
ASEL0  
WATCHDOG  
TIMER INTERRUPT  
FAULTB00  
TO/FROM OTHER  
LTC POWER SUPPLY MANAGERS  
SHARE_CLK  
ASEL1  
*SOME DETAILS OMITTED FOR CLARITY  
ONLY ONE OF EIGHT CHANNELS SHOWN  
GND  
–50  
–10  
30 50 70 90 110  
–30  
10  
2977 TA01a  
TEMPERATURE (°C)  
**MAY BE POWERED FROM EITHER AN  
EXTERNAL 3.3V SUPPLY OR THE INTERMEDIATE BUS  
2977 TA01b  
2977f  
1
For more information www.linear.com/LTC2977  
1234567...92

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