LTC3889 datasheet(3/118 Pages) AD

3 / 118 page

LTC3888/LTC3888-1/

LTC3888-2

Rev. B

For more information www.analog.com

TABLE OF CONTENTS

Resistor Configuration Pins....................................67

Internal Regulator Outputs......................................69

IC Junction Temperature.........................................69

Derating EEPROM Retention at Temperature..........70

Configuring Open-Drain Pins..................................70

PMBus Communication and Command

Processing..............................................................71

Status and Fault Log Management .........................72

LTpowerPlay – An Interactive Digital Power GUI.....72

Interfacing to the DC1613 .......................................73

Design Example...................................................... 74

PMBus Command Details ...............................78

Addressing and Write Protect.................................78

PAGE ..................................................................78

PAGE_PLUS_WRITE ..........................................78

PAGE_PLUS_READ............................................79

WRITE_PROTECT...............................................79

MFR_ADDRESS .................................................80

MFR_RAIL_ADDRESS .......................................80

General Device Configuration .................................80

PMBUS_REVISION.............................................80

CAPABILITY........................................................80

MFR_CONFIG_ALL.............................................81

On, Off and Margin Control.....................................81

ON_OFF_CONFIG................................................81

OPERATION........................................................82

MFR_RESET.......................................................82

PWM Configuration ................................................82

FREQUENCY_SWITCH........................................83

MFR_CHAN_CONFIG..........................................83

MFR_PWM_CONFIG_LTC3888..........................83

MFR_PWM_MODE_LTC3888 ............................86

MFR_PWM_COMP.............................................87

Input Voltage and Limits.........................................88

VIN_ON ..............................................................88

VIN_OFF .............................................................88

VIN_OV_FAULT_LIMIT........................................88

VIN_UV_WARN_LIMIT .......................................88

Output Voltage and Limits ......................................89

VOUT_MODE ......................................................89

VOUT_COMMAND ..............................................89

VOUT_MAX ........................................................90

MFR_VOUT_MAX...............................................90

VOUT_MARGIN_HIGH........................................90

VOUT_MARGIN_LOW.........................................90

VOUT_SCALE_LOOP (LTC3888-1)......................90

VOUT_OV_FAULT_LIMIT ....................................90

VOUT_OV_WARN_LIMIT ....................................91

VOUT_UV_WARN_LIMIT....................................91

VOUT_UV_FAULT_LIMIT ....................................91

MFR_SPI_DATA (LTC3888)................................91

Output Current and Limits ......................................92

IOUT_CAL_GAIN ................................................92

MFR_LOAD_EMULATION...................................92

MFR_LOAD_EMULATION.......................................92

IOUT_OC_FAULT_LIMIT .....................................93

IOUT_OC_WARN_LIMIT.....................................93

Output Timing, Delays, and Ramping .....................94

MFR_RESTART_DELAY......................................94

TON_DELAY .......................................................94

TON_RISE (LTC3888).........................................94

TON_MAX_FAULT_LIMIT...................................95

VOUT_TRANSITION_RATE.................................95

TOFF_DELAY ......................................................95

TOFF_FALL (LTC3888)........................................95

TOFF_MAX_WARN_LIMIT..................................95

External Temperature and Limits............................96

MFR_TEMP_1_GAIN...........................................96

MFR_TEMP_1_OFFSET.......................................96

OT_FAULT_LIMIT................................................96

OT_WARN_LIMIT ...............................................96

Status Reporting.....................................................97

STATUS_BYTE....................................................97

STATUS_WORD..................................................98

STATUS_VOUT ...................................................98

STATUS_IOUT ....................................................99

STATUS_INPUT ..................................................99

STATUS_TEMPERATURE....................................99

STATUS_CML................................................... 100

STATUS_MFR_SPECIFIC.................................. 100

MFR_PADS_LTC3888-1 ................................... 101

MFR_COMMON................................................ 101

MFR_INFO........................................................ 102

CLEAR_FAULTS................................................ 102

Telemetry.............................................................. 103

READ_VIN ........................................................ 103

MFR_VIN_PEAK ............................................... 104

READ_VOUT..................................................... 104

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