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