Linear Technology LTC2977 Demo Board: Octal Power Supply Manager [Requires DC1613] DC2028A DC2028A 数据表
产品代码
DC2028A
LTC2977
1
2977fa
Typical applicaTion
FeaTures
applicaTions
DescripTion
8-Channel PMBus Power
System Manager Featuring Accurate
Output Voltage Measurement
The
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
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 eight output voltages, one input voltage,
and die temperature. In addition, odd numbered channels
can be configured to measure the voltage across a current
sense resistor. 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
system management devices. Configuration EEPROM sup-
ports autonomous operation without additional software.
n
Computers and Network Servers
n
Industrial Test and Measurement
n
High Reliability Systems
n
Medical Imaging
n
Video
n
Sequence, Trim, Margin and Supervise Eight Power
Supplies
n
Manage Faults, Monitor Telemetry and Create Fault Logs
n
PMBus Compliant Command Set
n
Supported by LTpowerPlay™ GUI
n
Margin or Trim Supplies to 0.25% Accuracy
n
Fast OV/UV Supervisors Per Channel
n
Coordinate Sequencing and Fault Management
Across Multiple Chips
n
Automatic Fault Logging to Internal EEPROM
n
Operate Autonomously without Additional Software
n
Internal Temperature and Input Voltage Supervisors
n
Accurate Monitoring of Eight Output Voltages, Input
Voltage and Internal Die Temperature
n
I
2
C/SMBus Serial Interface
n
Can Be Powered from 3.3V, or 4.5V to 15V
n
Programmable Watchdog Timer
n
100% Pin-Compatible Upgrade to the LTC2978/LTC2978A
n
Available in 64-pin 9mm
× 9mm QFN Package
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.
8-Channel PMBus Power System Manager
Typical ADC Total Unadjusted
Error vs Temperature
TEMPERATURE (°C)
–50
–0.25
ERROR (%) –0.05
–0.10
–0.15
–0.20
0.05
0.10
0.15
0.25
50
2977 TA01b
0
0.20
10
90 110
–30 –10
30
70
V
SENSEP0
= 1.8V
THREE TYPICAL PARTS
V
PWR
V
DD33
WP
FAULTB00
SHARE_CLK
SHARE_CLK
SDA
SCL
ALERTB
CONTROL0
SCL
ALERTB
CONTROL0
V
IN_SNS
V
DACP0
V
SENSEP0
PWRGD
WDI/RESETB
ASEL0
ASEL1
ASEL1
V
DACM0
V
SENSEM0
V
OUT_EN0
LTC2977*
PMBus
INTERFACE
WRITE-PROTECT
TO/FROM OTHER
LTC POWER SUPPLY MANAGERS
3.3V**
4.5V < V
IBUS
< 15V**
GND
TO µP RESETB INPUT
WATCHDOG
WATCHDOG
TIMER INTERRUPT
*SOME DETAILS OMITTED FOR CLARITY
ONLY ONE OF EIGHT CHANNELS SHOWN
V
IN
V
OUT
R20
R30
R10
2977 TA01a
RUN/SS
SGND
V
FB
GND
LOAD
DIGITALLY
MANAGED
POWER
SUPPLY
TO INTERMEDIATE
BUS CONVERTER ENABLE
V
IN_EN
**MAY BE POWERED FROM EITHER AN
EXTERNAL 3.3V SUPPLY OR THE INTERMEDIATE BUS