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LTC2974IUPPBF PDF预览

LTC2974IUPPBF

更新时间： 2024-09-24 12:46:35
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
98页 1552K
描述
4-Channel PMBus Power System Manager

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LTC2974IUPPBF 数据手册

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LTC2974  
4-Channel PMBus Power System Manager  
Featuring Accurate Output Current Measurement  
FEATURES  
DESCRIPTION  
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-loadvoltageadjustmentandmargining.DACsuse  
a proprietary soft-connect algorithm to minimize supply  
disturbances.Supervisoryfunctionsincludeoverandunder  
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.  
Faultsthatdisableapowersupplycanautomaticallytrigger  
black box EEPROM storage of fault status and associated  
telemetry. An internal 16-bit ADC monitors four output  
voltages,fouroutputcurrents,fourexternaltemperatures,  
one input voltage and die temperature. Output power is  
also calculated. A programmable watchdog timer moni-  
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.  
n
Sequence, Trim, Margin and Supervise Four Power  
Supplies  
n
n
n
n
n
n
n
Manage Faults, Monitor Telemetry and Create Fault Logs  
PMBus Compliant Command Set  
TM  
Supported by LTpowerPlay GUI  
Margin or Trim Supplies to 0.25% Accuracy  
Fast OV/UV Supervisors Per Channel  
Fast Output Current 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  
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
n
I C/SMBus Serial Interface  
Can Be Powered from 3.3V, or 4.5V to 15V  
Available in 64-Lead 9mm × 9mm QFN Package  
APPLICATIONS  
n
Computers and Network Servers  
n
Industrial Test and Measurement  
L, LT, LTC, LTM, Linear Technology, the Linear logo, and PolyPhase 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.  
n
High Reliability Systems  
Medical Imaging  
Video  
n
n
TYPICAL APPLICATION  
ADC Total Unadjusted Error  
4-Channel PMBus Power System Manager  
vs Temperature  
V
4.5V < V  
IBUS  
< 15V**  
0.07  
IN  
–
I
I
**  
V
PWR  
V
IN_SNS  
SENSEP0  
0.06  
+
DC/DC  
I
CONVERTER  
0.05  
0.04  
0.03  
0.02  
0.01  
0
TG  
I
SENSEM0  
OV  
AUXFAULTB  
SW  
BG  
V
DAC0  
**  
V
DD33  
V
R30  
SENSEP0  
R20  
R10  
SDA  
PMBus  
INTERFACE  
LTC2974*  
V
LOAD  
FB  
SCL  
ALERTB  
CONTROL0  
V
V
SGND  
RUN/SS  
–0.01  
–0.02  
–0.03  
SENSEM0  
OUT_EN0  
TO/FROM  
OTHER  
DEVICES  
FAULTB0  
MMBT3906  
GND  
FAULTB1  
T
THREE TYPICAL PARTS  
–50 –25 25  
TEMPERATURE (°C)  
SENSE0  
PWRGD  
SHARE_CLK  
TO µP  
RESETB  
INPUT  
0
100  
50  
75  
ASEL0  
ASEL1  
*SOME DETAILS OMITTED FOR CLARITY  
ONLY ONE OF FOUR CHANNELS SHOWN  
0.1µF  
2974 TA01b  
WATCHDOG  
WP  
WDI/RESETB  
GND  
TIMER INTERRUPT  
**LTC2974 MAY BE POWERED FROM  
3.3V OR 4.5V TO 14V  
2974 TA01  
2974fa  
1
For more information www.linear.com/LTC2974  
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