LTC2980
16-Channel PMBus
Power System Manager
FEATURES
DESCRIPTION
The LTC®2980 is a 16-channel Power System Manager
used to sequence, trim (servo), margin, supervise,
manage faults, provide telemetry and create fault logs.
PMBus commands support power supply sequencing,
precision point-of-load voltage adjustment and margin-
ing. DACs use a proprietary soft-connect algorithm to
minimize supply disturbances. Supervisory functions
include overvoltage and undervoltage threshold limits
for sixteen power supply output channels and two power
supply input channels, as well as over and under tempera-
ture 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 trig-
ger black box EEPROM storage of fault status and associ-
ated telemetry. An internal 16-bit ADC monitors sixteen
output voltages, two input voltages, and die temperature.
In addition, odd numbered channels can be configured
to measure the voltage across a current sense resistor. A
programmable watchdog timer monitors microprocessor
activity for a stalled condition and resets the microproces-
sor if necessary. A single wire bus synchronizes power
supplies across multiple LTC Power System Management
(PSM) devices. Configuration EEPROM with ECC sup-
ports autonomous operation without additional software.
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Sequence, Trim, Margin and Supervise 16 Power
Supplies
n
Manage Faults, Monitor Telemetry and Create Fault Logs
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PMBus™ Compliant Command Set
Supported by LTpowerPlay® GUI
n
n
Margin or Trim Supplies to Within 0.25% of Target
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Fast OV/UV Supervisors Per Channel
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Coordinate Sequencing and Fault Management
Across Multiple LTC PSM Devices
n
Automatic Fault Logging to Internal EEPROM
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Operate Autonomously without Additional Software
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Internal Temperature and Input Voltage Supervisors
n
Accurate Monitoring of 16 Output Voltages, Two
Input Voltages and Internal Die Temperature
2
n
I C/SMBus Serial Interface
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Can Be Powered from 3.3V, or 4.5V to 15V
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Programmable Watchdog Timer
n
Available in 144-Pin 12mm × 12mm BGA Package
APPLICATIONS
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Computers and Network Servers
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Industrial Test and Measurement
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High Reliability Systems
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Medical Imaging
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents including 7382303, 7420359 and 7940091.
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Video
TYPICAL APPLICATION
16-Channel PMBus Power System Manager
Power Supply Accuracy
14
IBC
IN OUT
EN
34 PARTS SOLDERED DOWN
4.5V ≤ V
IBUS
≤ 15V
DC
IN
12
10
8
V
IN
V
IN_SNS
V
OUT
DC/DC
CONVERTER
RUN
V
V
IN_EN
*
PWR
+
SENSE
–
* LTC2980 MAY ALSO BE
POWERED DIRECTLY FROM
AN EXTERNAL 3.3V SUPPLY
V
*
DD33
V
LOAD
V
FB
6
4
LTC2980
R20
SDA
PMBus
INTERFACE
V
SCL
DAC
2
0
R30
ALERTB
CONTROL
FAULT
R10
–0.25
–0.15
–0.05
0.05
0.15
0.25
PWRGD
V
OUT_EN
ERROR (%)
NOTE: SOME DETAILS OMITTED FOR CLARITY
ONLY ONE OF 16 CHANNELS SHOWN
2980 TA01b
2980 TA01a
Rev B
1
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