LTC2972 datasheet(2/112 Pages) LINER

2 / 112 page

LTC2972

2972fa

For more information www.linear.com/LTC2972

TABLE OF CONTENTS

Features............................................................................1

Applications .......................................................................1

Typical Application ...............................................................1

Description.........................................................................1

Absolute Maximum Ratings.....................................................4

Order Information.................................................................4

Pin Configuration .................................................................4

Electrical Characteristics........................................................5

PMBus Timing Diagram........................................................ 11

Typical Performance Characteristics ........................................ 12

Pin Functions .................................................................... 16

Block Diagram................................................................... 18

Operation......................................................................... 19

LTC2972 Operation Overview.............................................................19

EEPROM....................................................................................... 20

AUXFAULTB ....................................................................................... 20

RESETB.............................................................................................. 20

VDDIO.....................................................................................................................20

PMBus Serial Digital Interface .......................................................... 21

PMBus.......................................................................................... 21

Device Address ............................................................................ 21

Processing Commands................................................................ 21

Addressing and Write Protect ........................................................... 31

PAGE ............................................................................................ 31

WRITE_PROTECT ........................................................................ 32

WRITE PROTECT Pin ................................................................... 32

MFR_PAGE_FF_MASK................................................................. 33

MFR_I2C_BASE_ADDRESS ........................................................ 33

MFR_COMMAND_PLUS.............................................................. 33

MFR_DATA_PLUS0 and MFR_DATA_PLUS1.............................. 33

MFR_STATUS_PLUS0, and MFR_STATUS_PLUS1 .................... 33

Reading Fault Log Using Command Plus and MFR_DATA_PLUS0.

Reading Energy Using MFR_COMMAND_PLUS and MFR_DATA_

PLUS0 .......................................................................................... 35

Peek Operation Using MFR_DATA_PLUS0.................................. 35

Enabling and Disabling Poke Operations..................................... 35

Poke Operation Using Mfr_data_plus0 ....................................... 36

Command Plus Operations Using MFR_DATA_PLUS1 ............... 36

On/Off Control, Margining and Configuration................................... 36

OPERATION.................................................................................. 37

ON_OFF_CONFIG ......................................................................... 38

MFR_CONFIG_LTC2972 .............................................................. 38

Cascade Sequence ON with Time-Based Sequence OFF............. 40

MFR_CONFIG2_LTC2972 .............................................................41

MFR_CONFIG3_LTC2972 .............................................................41

Tracking Supplies On and Off ...................................................... 42

Tracking Implementation ............................................................. 42

MFR_CONFIG_ALL_LTC2972 ..................................................... 44

Programming User EEPROM Space.................................................. 46

STORE_USER_ALL and RESTORE_USER_ALL.......................... 46

MFR_EE_UNLOCK ....................................................................... 47

MFR_EE_ERASE.......................................................................... 47

MFR_EE_DATA............................................................................. 47

Response When Part Is Busy....................................................... 48

MFR_EE Erase and Write Programming Time............................. 48

Input Voltage Commands and Limits ................................................ 48

VIN_ON, VIN_OFF, VIN_OV_FAULT_LIMIT, VIN_OV_WARN_

LIMIT, VIN_UV_WARN_LIMIT and

VIN_UV_FAULT_LIMIT................................................................. 49

INPUT Current and ENERGY.............................................................. 49

Energy Measurement and Reporting........................................... 49

MFR_EIN ..................................................................................... 49

MFR_EIN_CONFIG ....................................................................... 50

MFR_IIN_CAL_GAIN ....................................................................51

MFR_IIN_CAL_GAIN_TC ..............................................................51

MFR_CLEAR_ENERGY .................................................................51

Output Voltage Commands and Limits.............................................. 52

VOUT_MODE................................................................................ 52

VOUT_COMMAND, VOUT_MAX, VOUT_MARGIN_HIGH, VOUT_

MARGIN_LOW, VOUT_OV_FAULT_LIMIT,

VOUT_OV_WARN_LIMIT, VOUT_UV_WARN_LIMIT, VOUT_UV_

FAULT_LIMIT, POWER_GOOD_ON and

POWER_GOOD_OFF .................................................................... 53

MFR_VOUT_DISCHARGE_THRESHOLD...................................... 53

MFR_DAC_STARTUP................................................................... 53

MFR_DAC..................................................................................... 53

Output CURRENT Commands and Limits ......................................... 54

IOUT_CAL_GAIN and IOUT_CAL_OFFSET .................................. 54

IOUT_OC_WARN_LIMIT .............................................................. 54

MFR_IOUT_CAL_GAIN_TC.......................................................... 54

External Temperature Commands and Limits................................... 55

OT_FAULT_LIMIT, OT_WARN_LIMIT, UT_WARN_LIMIT and

UT_FAULT_LIMIT......................................................................... 56

MFR_TEMP_1_GAIN and MFR_TEMP_1_OFFSET ....................... 56

MFR_T_SELF_HEAT, MFR_IOUT_CAL_GAIN_TAU_INV and MFR_

IOUT_CAL_GAIN_THETA ............................................................. 56

Sequencing Timing Limits and Clock Sharing................................... 58

TON_DELAY, TON_RISE, TON_MAX_FAULT_LIMIT and TOFF_

DELAY .......................................................................................... 58

MFR_RESTART_DELAY............................................................... 59

Clock Sharing............................................................................... 59

Watchdog Timer and Power Good..................................................... 59

MFR_PG_CONFIG........................................................................ 60

MFR_PG_GPO ............................................................................. 62

MFR_PWRGD_EN........................................................................ 62

MFR_POWERGOOD_ASSERTION_DELAY.................................. 62

Watchdog Operation .................................................................... 63

MFR_WATCHDOG_T_FIRST and MFR_WATCHDOG_T ............... 63

Fault Responses ................................................................................ 63

Clearing Latched Faults ............................................................... 64

VOUT_OV_FAULT_RESPONSE and VOUT_UV_FAULT_RESPONSE

OT_FAULT_RESPONSE, UT_FAULT_RESPONSE, VIN_OV_FAULT_

RESPONSE and VIN_UV_FAULT_RESPONSE.............................. 65

TON_MAX_FAULT_RESPONSE ................................................... 65

MFR_RETRY_DELAY ................................................................... 66

MR_RETRY_COUNT .................................................................... 66

Shared External Faults....................................................................... 67

MFR_FAULTB0_PROPAGATE and MFR_FAULTB1_PROPAGATE 67

MFR_FAULTB0_RESPONSE and MFR_FAULTB1_RESPONSE ... 67

Fault Warning and Status .................................................................. 68

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