LTC2972 datasheet(3/112 Pages) LINER

3 / 112 page

LTC2972

2972fa

For more information www.linear.com/LTC2972

CLEAR_FAULTS ........................................................................... 68

STATUS_BYTE ............................................................................. 69

STATUS_WORD ........................................................................... 69

STATUS_VOUT............................................................................. 70

STATUS_IOUT.............................................................................. 70

STATUS_INPUT............................................................................ 70

STATUS_TEMPERATURE............................................................. 71

STATUS_CML............................................................................... 71

STATUS_MFR_SPECIFIC ............................................................. 72

MFR_PADS .................................................................................. 72

MFR_COMMON............................................................................ 73

MFR_STATUS_2 ...........................................................................74

MFR_FIRST_FAULT ......................................................................74

Telemetry........................................................................................... 75

READ_VIN .................................................................................... 75

READ_IIN ..................................................................................... 75

READ_PIN.................................................................................... 75

READ_VOUT................................................................................. 75

READ_IOUT.................................................................................. 76

MFR_IIN_PEAK............................................................................ 76

READ_TEMPERATURE_2 ............................................................ 76

READ_POUT ................................................................................ 77

MFR_READ_IOUT........................................................................ 77

MFR_IOUT_SENSE_VOLTAGE ..................................................... 78

MFR_VIN_PEAK........................................................................... 78

MFR_TEMPERATURE_1_MIN...................................................... 79

Fault Logging..................................................................................... 79

Fault Log Operation...................................................................... 79

MFR_FAULT_LOG_STORE........................................................... 80

MFR_FAULT_LOG_RESTORE ...................................................... 80

MFR_FAULT_LOG_CLEAR........................................................... 80

MFR_FAULT_LOG_STATUS......................................................... 80

MFR_FAULT_LOG ........................................................................ 80

MFR_FAULT_LOG Read Example ................................................ 83

Identification/Information ................................................................. 88

CAPABILITY ................................................................................. 88

PMBUS_REVISION ...................................................................... 88

MFR_SPECIAL_ID ....................................................................... 88

MFR_SPECIAL_LOT .................................................................... 88

MFR_INFO.................................................................................... 89

User Scratchpad ................................................................................ 89

USER_DATA_00, USER_DATA_01, USER_DATA_02, USER_

DATA_03, USER_DATA_04 and MFR_LTC_RESERVED_2 ......... 89

Applications Information ...................................................... 90

Overview............................................................................................ 90

Powering the LTC2972 ...................................................................... 90

Setting Command Register Values.................................................... 90

MEASURING INPUT CURRENT ......................................................... 90

MEASURING INPUT VOLTAGE .......................................................... 92

MEASURING INPUT POWER............................................................. 92

Measuring INPUT ENERGY................................................................ 92

Sequence, Servo, Margin and Restart Operations............................ 92

Command Units On or Off ........................................................... 92

On Sequencing............................................................................. 93

On State Operation....................................................................... 93

Servo Modes................................................................................ 93

DAC Modes .................................................................................. 93

Margining..................................................................................... 94

Off Sequencing ............................................................................ 94

VOUT Off Threshold Voltage......................................................... 94

Automatic Restart via MFR_RESTART_DELAY Command and

CONTROL Pin............................................................................... 94

Fault Management ............................................................................. 95

Output Overvoltage and Undervoltage Faults.............................. 95

Output Overvoltage, Undervoltage, and Overcurrent Warnings.. 95

Configuring the AUXFAULTB Output............................................ 95

Multi-Channel Fault Management................................................ 95

Interconnect Between Multiple ADI POWER MANAGERS................. 97

Application Circuits ........................................................................... 98

Trimming and Margining DC/DC Converters with External

Feedback Resistors...................................................................... 98

Four-Step Resistor Selection Procedure for DC/DC Converters

with External Feedback Resistors................................................ 98

Trimming and Margining DC/DC Converters with a TRIM Pin..... 99

Two-Step Resistor and DAC Full-Scale Voltage Selection

Procedure for DC/DC Converters with a TRIM Pin...................... 99

Measuring Output with a Sense Resistor .................................. 100

Measuring Output with Inductor DCR ....................................... 100

Single Phase Design Example.................................................... 100

Measuring Multiphase Currents .................................................101

Measuring Output Current in Buffered IMON Telemetry Mode ..101

LT3086 IMON Design Example...................................................101

Anti-Aliasing Filter Considerations ............................................ 102

Sensing Negative Voltages ........................................................ 102

Connecting the DC1613 USB to I2C/SMBus/PMBus Controller to

the LTC2972 in System.............................................................. 103

Accurate DCR Temperature Compensation..................................... 105

LTpowerPlay: An Interactive GUI for Power Managers ................... 106

PCB Assembly and Layout Suggestions ......................................... 108

Bypass Capacitor Placement ..................................................... 108

Exposed Pad Stencil Design ...................................................... 108

PCB Board Layout...................................................................... 108

Unused ADC Sense Inputs......................................................... 108

Design Checklist .............................................................................. 109

I2C .............................................................................................. 109

Output Enables........................................................................... 109

VIN Sense ................................................................................... 109

Input Current Sense................................................................... 109

External Temperature Sense...................................................... 109

Logic Signals.............................................................................. 109

Unused Inputs............................................................................ 109

DAC Outputs............................................................................... 109

Package Description ..........................................................110

Revision History ...............................................................111

Typical Application ............................................................112

Related Parts ...................................................................112

TABLE OF CONTENTS

LTC2972 Datasheet(PDF) 3 Page - Linear Technology

LTC2972 Datasheet(HTML) 3 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL