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LTC2978_12

更新时间： 2024-09-24 11:45:59
品牌 Logo 应用领域
Linear Systems 可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数 文件大小 规格书
80页 1131K
描述
Octal Digital Power Supply Manager with EEPROM

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中文翻译

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LTC2978_12 数据手册

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LTC2978  
Octal Digital Power Supply  
Manager with EEPROM  
FEATURES  
DESCRIPTION  
2
The LTC®2978 is an octal, digital power-supply monitor,  
supervisor, sequencer, and margin controller. Eight output  
channels can be managed per user defined configura-  
tion settings. Supervisory functions include fault OV/UV  
threshold limits for eight output channels and one input  
channel.Programmablefaultdependenciesandresponses  
allow the power supplies to be disabled with optional retry  
after a fault has been detected. Serial bus telemetry allows  
eight output voltages, one input voltage, die temperature  
and fault status to be monitored. In addition, odd num-  
bered channels can be configured to measure the voltage  
acrossacurrentsenseresistor. Powersupplysequencing,  
precisionpoint-of-loadvoltageadjustmentandmargining  
are supported with PMBus commands. A programmable  
watchdog timer monitors microprocessor activity for a  
stalled condition and resets the microprocessor if neces-  
sary. The 1-wire synchronization bus supports power  
supply sequencing across multiple LTC digital power  
devices. User programmable parameters can be stored  
in EEPROM. Faults and telemetry data can be logged to  
EEPROM for diagnostic analysis.  
n
I C/SMBus Serial Interface  
n
PMBus Compliant Command Set  
n
Configuration EEPROM with CRC  
n
Black Box Fault Logging to Internal EEPROM  
n
Differential Input, 16-Bit ΔΣ ADC with Less Than  
±±.2ꢀ5 of Total Unadjusted Error  
n
Eight Voltage Servos Precisely Adjust Output  
Voltages Using Eight 1±-Bit DACs with Soft-Connect  
n
Monitors Eight Output Voltages and One Input  
Voltage and Internal Die Temperature  
n
8-Channel Sequencer  
n
Programmable Watchdog Timer  
n
Eight UV/OV V  
and One V Supervisor  
OUT  
IN  
n
n
n
n
Supports Multi-Channel Fault Management  
Operates Autonomously without Additional Software  
LTC2978 Can Be Powered from 3.3V or 4.ꢀV to 1ꢀV  
Available in 64-pin 9mm × 9mm QFN package  
APPLICATIONS  
n
Computers  
n
Network Servers  
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 73823±3 and 742±3ꢀ9.  
Industrial Test and Measurement  
High Reliability Systems  
Medical Imaging  
Video  
n
n
n
TYPICAL APPLICATION  
Typical ADC Total Unadjusted  
Octal Power Supply Controller with PMBus Interface  
Error vs Temperature  
0.035  
0.030  
ADC V = 1.8V  
IN  
V
4.5V < V  
IBUS  
< 15V  
IN  
V
V
V
IN_SNS  
V
PWR  
OUT  
3.3V**  
V
DIGITALLY  
DD33  
DACP0  
0.025  
MANAGED  
POWER  
V
R30  
SENSEP0  
TO INTERMEDIATE  
BUS CONVERTER ENABLE  
V
IN_EN  
R20  
R10  
0.020  
0.015  
0.010  
0.005  
SUPPLY  
LTC2978*  
V
SDA  
LOAD  
FB  
SCL  
V
PMBus  
DACM0  
INTERFACE  
ALERTB  
V
SENSEM0  
SGND  
CONTROL0  
WP  
V
RUN/SS  
OUT_EN0  
GND  
WRITE-PROTECT  
PWRGD  
TO µP RESETB INPUT  
0
WDI/RESETB  
ASEL0  
WATCHDOG  
–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  
2978 TA01b  
GND  
2978 TA01a  
**LTC2978 MAY BE POWERED FROM EITHER AN  
EXTERNAL 3.3V SUPPLY OR THE INTERMEDIATE BUS  
2978fc  
1
1234567...80

中文翻译

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