Programmable Six Supply Sequencer and Supervisor

Programmable Six Supply Sequencer and Supervisor
5V
3.3V
2.5V
DC/DC
Converters
1.8V
1.5V
1.2V
System
Logic
I2C/SMBus
LTC2937
ENABLE 6x
EEPROM
ON
SEQUENCER
MARGIN
UV/OV THRESHOLDS
RESET
STATUS OK
FAULT LOGGING
Eases Sequencing and Voltage Supervision of FPGA/ASIC/µProcessor Supplies
Many FPGAs, ASICs and microprocessors require tight accuracy and complex sequencing of their power supplies for high​
reliability and to prevent processor damage. The LTC®2937 is designed to carefully control and supervise these point-of-load
supplies, while providing flexibility to reconfigure on the fly—effectively future proofing the design. A unique and flexible
sequencing technique turns supplies on and off in any one of 1023 possible sequence positions, separated either with
adjustable time delays or by qualifying events. Digitally adjustable ±0.75% accurate undervoltage (UV) and overvoltage (OV)
thresholds reduce development time, improve system reliability, and ease resulting power supply tolerances. A simple single
wire connection synchronizes up to fifty LTC2937s for sequencing expansion to 300 supplies, simplifying board routing. The
LTC2937, along with the LTC2933 and LTC2936 programmable 6-channel voltage supervisors, is supported by an interactive
and intuitive GUI for configuration, system diagnostics and debugging.
Sequenced Power Supply Waveforms
Features
Time and Event Based Sequencing for 6 Power Supplies
12 Programmable UV and OV Comparators with ±0.75% Guaranteed
Accuracy Over Temperature
nn I2 C/SMBus Adjustable 8-Bit UV and OV Thresholds
nn EEPROM for Storing Configuration and Fault Log
nn Single Wire Synchronizes up to 50 Devices and 300 Supplies
nn Supported by LTpowerPlay™ GUI
nn No Software Coding Required for Autonomous Operation
nn Breakpoints and Sequence Stepping
nn Programmable Reset Output Delay
nn Wide Supply Range: 2.9V to 16.5V
nn 28-Pin 5mm x 6mm QFN Package
nn
5V
nn
VOLTAGE
3.3V
V1
V2
V3
V4
V5
2.5V
1.8V
1.5V
1.2V
V6
ON
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.
TIME
Programmable Time and Event Based Sequencing Example
2.9V TO 16.5V
VPWR
VCORE1
EN1
SYSTEM 1
µP/FPGA
EN2
EN3
nn
VIO1
READY
nn
V3
ON
nn
V2
V1
SDA
SCL
L
EN4
VIO2
EN5
LTC2937
SPCLK
nn
VCORE2
SYSTEM 2
µP/FPGA
EN6
VAUX
FAULTB
VCORE1
RSTB
VIO1
V6
t1
TIME
DELAY
V5
GND
System 1: Core and I/O supplies separated
with time delay (t1)
System 2 supplies wait for READY signal from
System 1 to cross V3 threshold (event based delay t2)
System 2: Core, I/O and Aux supplies separated
with time delays
Sequence position clock (SPCLK) connects
to other LTC2937s for expansion
V4
t2
EVENT DELAY
READY
VCORE2
VIO2
VAUX
SYSTEM 2 DOES NOT SEQUENCE UNTIL SYSTEM 1 IS READY
LTpowerPlay Development Environment
Programmable 6-Channel Sequencer and Supervisors with EEPROM
Device
Sequencer
Comparator
Outputs
Threshold
Range
Threshold
Accuracy
Power Supply
Package
(mm × mm)
Demo Board*
LTC2933
No
No
1V to 13.9V (1×)
0.2V to 5.8V (5×)
±1%
3.4V to 13.9V
5×4 DFN-16,
SSOP-16
DC1633
LTC2936
No
Yes
0.2V to 5.8V (6×)
±1%
3.13V to 13.9V
4×5 QFN-24,
SSOP-24
DC1605
LTC2937
Yes
No
0.2V to 6V (6×)
±0.75%
2.9V to 16.5V
5×6 QFN-28
DC2313
* DC1613 I2C-USB adapter connects demo board to computer running LTpowerPlay
www.linear.com/2937 n 1-800-4-LINEAR
0815