Eight Channel Power System Manager

8-Channel Power System Manager
Unrivaled ±0.25% Measurement Accuracy Increases System Efficiency
The LTC®2977 PMBus Power System Manager with EEPROM provides complete digital power management of power supply systems with
eight or more rails. The LTC2977 utilizes an I2C interface and PMBus command set to monitor, supervise, sequence, margin, fault manage
and fault log positive or negative supplies. This provides rapid troubleshooting and debug capabilities during power system design,
development, production and failure analysis. Power supply channels can be sequenced on or off using programmable time delays,
while dedicated voltage supervisors on each channel provide precise thresholds and fast response times to protect loads from electrical
overstress. All of the LTC2977’s functions perform with uncompromised accuracy, including better than ±0.25% total unadjusted error
on ADC telemetry, and 0.25% margining and trimming accuracy on each supply. Users can harness the powerful LTpowerPlay™ GUI to
configure and interrogate the LTC2977’s registers, user settings and fault log. Once configured, the LTC2977 provides the essential system
management functions without host intervention and does not require writing a single line of code.
Features
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Trim/Margin Eight Supplies to 0.25% Accuracy
EEPROM for Configuration and Black Box Fault
Logging
I2C/SMBus Interface, PMBus Command Set
Supported by LTpowerPlay GUI
Supply Sequencer, Time Based or Tracking
Monitor (16-Bit ADC) and Supervise (12µs Fast):
−− Input and Eight Supply Voltages
−− Optional Current Monitor on Odd Channels
−− Die Temperature
Coordinate Sequencing and Fault Management
Across Managers
Watchdog Timer
Operates Autonomously without Additional Software
–40°C to 105°C Operation
100% Pin-Compatible Upgrade to the LTC2978/
LTC2978A
64-Pin 9mm × 9mm QFN Package
4.5V < VIBUS < 15V**
VIN
VPWR
VIN_SNS
3.3V**
VDD33
VDACP0
TO INTERMEDIATE BUS
CONVERTER ENABLE
VIN_EN
VSENSEP0
SDA
PMBus
INTERFACE
LTC2977*
SCL
VOUT
LOAD
DIGITALLY
MANAGED
POWER
SUPPLY
VFB
VDACM0
ALERTB
VSENSEM0
SGND
CONTROL0
VOUT_EN0
RUN/SS
GND
WRITE-PROTECT
TO/FROM OTHER
LTC POWER SUPPLY
MANAGERS
WP
PWRGD
WDI/RESETB
FAULTB00
ASEL0
SHARE_CLK
ASEL1
L, LT, LTC, LTM, 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.
GND
TO µP RESETB INPUT
WATCHDOG
TIMER INTERRUPT
* SOME DETAILS OMITTED FOR CLARITY
ONLY ONE OF EIGHT CHANNELS SHOWN
** MAY BE POWERED FROM EITHER AN
EXTERNAL 3.3V SUPPLY OR THE
INTERMEDIATE BUS
Complete Development Platform with LTpowerPlay GUI
lay
rP
LTpowe
For Prototyping and Debug
FREE Download
www.linear.com/LTpowerPlay
USB
DC1613
USB to PMBus
Controller
DC2028
LTC2977
Demo Board
Demonstration
Board
SYSTEM TREE
CONFIGURATION
SETTINGS
OSCILLOSCOPE
LIKE TELEMETRY
DISPLAY
Customer Board
with
LTC2977
In-Circuit Serial
Programming
or
TELEMETRY
DATA
IDEALIZED
POWER SUPPLY
WAVEFORMS
CONTEXT SENSITIVE
DISPLAY OF SELECTED
PARAMETERS
DEVICE
DASHBOARD
FAULT SHARING
CONFIGURATION
www.linear.com/LTC2977 n 1-800-4-LINEAR
0513
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