FeaTures
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LTC2975
4-Channel PMBus Power
System Manager Featuring Accurate
Input Current and Energy Measurement
DescripTion
The
LTC
®
2975
is a 4-channel Power System Manager used
to sequence, trim (servo), margin, supervise, manage
faults, provide telemetry and create fault logs. PMBus
commands support power supply sequencing, precision
point-of-load voltage adjustment and margining. DACs use
a proprietary soft-connect algorithm to minimize supply
disturbances. Supervisory functions include over and under
current, voltage and temperature threshold limits for four
power supply output channels as well as over and under
voltage threshold limits for a single power supply input
channel. Programmable fault responses can disable the
power supplies with optional retry after a fault is detected.
Faults that disable a power supply can automatically trigger
black box EEPROM storage of fault status and associated
telemetry. An internal 16-bit ADC monitors four output
voltages, four output currents, four external temperatures,
input voltage and current, and die temperature. Input power,
energy, and output power is also calculated. A program-
mable watchdog timer monitors microprocessor activity
for a stalled condition and resets the microprocessor if
necessary. A single wire bus synchronizes power supplies
across multiple LTC Power System Management (PSM)
devices. Configuration EEPROM supports autonomous
operation without additional software.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered
trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. PMBus is
a trademark of SMIF, Inc. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 7382303, 7420359 and 8648623.
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Sequence, Trim, Margin and Supervise Four Power
Supplies
Manage Faults, Monitor Telemetry and Create Fault Logs
PMBus™ Compliant Command Set
Supported by LTpowerPlay™ GUI
Margin or Trim Supplies to Within 0.25% of Target
Monitor Input Current (±1%) and Accumulate Energy
Fast OV/UV and OC Supervisors Per Channel
Coordinate Sequencing and Fault Management
Across Multiple LTC PSM Devices
Automatic Fault Logging to Internal EEPROM
Operate Autonomously Without Additional Software
External Temperature and Input Voltage Supervisors
Accurate Monitoring of Four Output Voltages, Four
Output Currents, Four External Temperatures, Input
Voltage and Current, and Internal Die Temperature
I
2
C/SMBus Serial Interface
Can Be Powered from 3.3V, or 4.5V to 15V
Pin-Compatible to the LTC2974
Available in 64-Lead 9mm × 9mm QFN Package
Computers and Network Servers
Industrial Test and Measurement
High Reliability Systems
Video and Medical Imaging
applicaTions
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Typical applicaTion
4-Channel PMBus Power System Manager with Input Energy Metering
4.5V < V
IBUS
< 15V
OV
V
PWR
V
IN_SNS
AUXFAULTB
V
IN_SNS_CAP
V
DD33**
SDA
SCL
ALERTB
CONTROL0
TO/FROM
OTHER
DEVICES
FAULTB0
FAULTB1
SHARE_CLK
ASEL0
ASEL1
WP
GND
WDI/RESETB
PWRGD
LTC2975*
V
SENSEM0
V
OUT_EN0
T
SENSE0
TO µP
RESETB
INPUT
WATCHDOG
TIMER INTERRUPT
2975 TA01a
Power Measurement Error
2
Mfr_ein_config_iin_range = Medium
V
IIN_SNS
= 50mV
V
VIN_SNS
= 12V
V
IN
I
IN_SNSP
I
IN_SNSM
I
SENSEP0
I
SENSEM0
V
DAC0
V
SENSEP0
R20
LOAD
R10
SGND
MMBT3906
RUN/SS
GND
V
FB
R30
I
–
I
+
TG
SW
BG
DC/DC
CONVERTER
1
ERROR (%)
0
PMBus
INTERFACE
–1
6 TYPICAL PARTS
–2
0
25
–50 –25
50
75
TEMPERATURE (°C)
0.1µF
*SOME DETAILS OMITTED FOR CLARITY
ONLY ONE OF FOUR CHANNELS SHOWN
**LTC2975 MAY ALSO BE POWERED
DIRECTLY FROM EXTERNAL 3.3V SUPPLY
100
2975 TA01b
For more information
www.linear.com/LTC2975
1
2975f
LTC2975
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......................................................10
Typical Performance Characteristics ......................................10
Pin Functions ..................................................................14
Block Diagram.................................................................16
Operation.......................................................................17
LTC2975 Operation Overview ......................................................... 17
EEPROM .................................................................................... 18
AUXFAULTB .................................................................................... 18
RESETB ........................................................................................... 19
PMBus Serial Digital Interface ........................................................ 19
PMBus ....................................................................................... 19
Device Address.......................................................................... 19
Processing Commands ............................................................. 20
PMBUS Command Summary ................................................23
PMBus Command Description ..............................................29
Addressing and Write Protect......................................................... 29
PAGE .......................................................................................... 29
WRITE_PROTECT...................................................................... 30
WRITE-PROTECT Pin ................................................................ 30
MFR_PAGE_FF_MASK .............................................................. 30
MFR_I2C_BASE_ADDRESS ...................................................... 31
MFR_COMMAND_PLUS ........................................................... 31
MFR_DATA_PLUS0 and MFR_DATA_PLUS1 ........................... 31
MFR_STATUS_PLUS0, and MFR_STATUS_PLUS1.................. 31
Reading Fault Log Using Command Plus and Mfr_data_plus0 32
Reading Energy Using MFR_COMMAND_PLUS and
MFR_DATA_PLUS0 ................................................................... 33
Peek Operation Using Mfr_data_plus0 ..................................... 33
Enabling and Disabling Poke Operations .................................. 33
Poke Operation Using Mfr_data_plus0 ..................................... 33
On/Off Control, Margining and Configuration ................................ 34
OPERATION ............................................................................... 34
Command Plus Operations Using Mfr_data_plus1.................. 34
ON_OFF_CONFIG ....................................................................... 35
MFR_CONFIG_LTC2975 ............................................................ 36
Cascade Sequence ON with Time-Based Sequence OFF .......... 37
MFR_CONFIG2_LTC2975.......................................................... 38
MFR_CONFIG3_LTC2975 .......................................................... 39
Tracking Supplies On and Off .................................................... 40
Tracking Implementation........................................................... 43
MFR_CONFIG_ALL_LTC2975 ................................................... 43
Programming User EEPROM Space ............................................... 45
STORE_USER_ALL and RESTORE_USER_ALL ....................... 45
Bulk Programming the User EEPROM Space ............................ 45
MFR_EE_UNLOCK..................................................................... 46
MFR_EE_ERASE ....................................................................... 46
MFR_EE_DATA .......................................................................... 46
Response When Part Is Busy .................................................... 47
MFR_EE Erase and Write Programming Time .......................... 47
Input Voltage Commands and Limits ............................................. 47
VIN_ON, VIN_OFF, VIN_OV_FAULT_LIMIT,
VIN_OV_WARN_LIMIT, VIN_UV_WARN_LIMIT and
VIN_UV_FAULT_LIMIT .............................................................. 47
INPUT Current and ENERGY ........................................................... 48
Energy Measurement and Reporting ........................................ 48
MFR_EIN .................................................................................. 48
MFR_EIN_CONFIG .................................................................... 49
MFR_IIN_CAL_GAIN ................................................................. 49
MFR_IIN_CAL_GAIN_TC........................................................... 50
Output Voltage Commands and Limits ........................................... 50
VOUT_MODE ............................................................................. 51
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.................................................................. 51
MFR_VOUT_DISCHARGE_THRESHOLD ................................... 51
MFR_DAC .................................................................................. 51
Output Current Commands and Limits ........................................... 52
IOUT_CAL_GAIN ....................................................................... 52
IOUT_OC_FAULT_LIMIT, IOUT_OC_WARN_LIMIT and
IOUT_UC_FAULT_LIMIT ............................................................ 52
MFR_IOUT_CAL_GAIN_TC ....................................................... 53
External Temperature Commands and Limits ................................ 53
OT_FAULT_LIMIT, OT_WARN_LIMIT, UT_WARN_LIMIT and
UT_FAULT_LIMIT ...................................................................... 54
MFR_TEMP_1_GAIN and MFR_TEMP_1_OFFSET ..................... 54
MFR_T_SELF_HEAT, MFR_IOUT_CAL_GAIN_TAU_INV and
MFR_IOUT_CAL_GAIN_THETA ................................................. 54
Sequencing Timing Limits and Clock Sharing ................................ 56
TON_DELAY, TON_RISE, TON_MAX_FAULT_LIMIT and
TOFF_DELAY.............................................................................. 56
MFR_RESTART_DELAY ............................................................ 57
Clock Sharing ............................................................................ 57
Watchdog Timer and Power Good .................................................. 57
MFR_PWRGD_EN ..................................................................... 57
MFR_POWERGOOD_ASSERTION_DELAY ............................... 58
Watchdog Operation.................................................................. 58
MFR_WATCHDOG_T_FIRST and MFR_WATCHDOG_T ............. 58
Fault Responses.............................................................................. 59
Clearing Latched Faults ............................................................. 59
VOUT_OV_FAULT_RESPONSE and
VOUT_UV_FAULT_RESPONSE .................................................. 59
IOUT_OC_FAULT_RESPONSE and
IOUT_UC_FAULT_RESPONSE ................................................... 60
OT_FAULT_RESPONSE, UT_FAULT_RESPONSE,
VIN_OV_FAULT_RESPONSE and VIN_UV_FAULT_RESPONSE 61
TON_MAX_FAULT_RESPONSE................................................. 62
MFR_RETRY_DELAY................................................................. 62
MFR_RETRY_COUNT ................................................................ 62
Shared External Faults .................................................................... 63
MFR_FAULTB0_PROPAGATE and
MFR_FAULTB1_PROPAGATE .................................................... 63
MFR_FAULTB0_RESPONSE and MFR_FAULTB1_RESPONSE . 63
2975f
2
For more information
www.linear.com/LTC2975
LTC2975
Table oF conTenTs
Fault Warning and Status ............................................................... 64
CLEAR_FAULTS ........................................................................ 64
STATUS_BYTE........................................................................... 65
STATUS_WORD ......................................................................... 65
STATUS_VOUT .......................................................................... 66
STATUS_IOUT ........................................................................... 66
STATUS_INPUT ......................................................................... 66
STATUS_TEMPERATURE .......................................................... 67
STATUS_CML ............................................................................ 67
STATUS_MFR_SPECIFIC .......................................................... 68
MFR_PADS ................................................................................ 68
MFR_COMMON ......................................................................... 69
Telemetry ........................................................................................ 70
READ_VIN ................................................................................. 70
READ_IIN .................................................................................. 70
READ_PIN ................................................................................. 70
READ_VOUT .............................................................................. 70
READ_IOUT ............................................................................... 71
MFR_IIN_PEAK ......................................................................... 71
MFR_IIN_MIN ........................................................................... 71
MFR_PIN_PEAK ........................................................................ 71
MFR_PIN_MIN .......................................................................... 71
READ_TEMPERATURE_1 .......................................................... 71
READ_TEMPERATURE_2.......................................................... 71
READ_POUT .............................................................................. 71
MFR_READ_IOUT ..................................................................... 72
MFR_IOUT_SENSE_VOLTAGE................................................... 73
MFR_VIN_PEAK ........................................................................ 73
MFR_VOUT_PEAK ..................................................................... 73
MFR_IOUT_PEAK ...................................................................... 73
MFR_TEMPERATURE_1_PEAK ................................................. 73
MFR_VIN_MIN .......................................................................... 73
MFR_VOUT_MIN ....................................................................... 73
MFR_IOUT_MIN ........................................................................ 73
MFR_TEMPERATURE_1_MIN ................................................... 74
Fault Logging .................................................................................. 74
Fault Log Operation ................................................................... 74
MFR_FAULT_LOG_STORE ........................................................ 74
MFR_FAULT_LOG_RESTORE.................................................... 74
MFR_FAULT_LOG_CLEAR ........................................................ 75
MFR_FAULT_LOG_STATUS ...................................................... 75
MFR_FAULT_LOG...................................................................... 75
MFR_FAULT_LOG Read Example .............................................. 78
Identification/Information............................................................... 82
CAPABILITY............................................................................... 83
PMBus_REVISION..................................................................... 83
MFR_SPECIAL_ID ..................................................................... 83
MFR_SPECIAL_LOT .................................................................. 83
User Scratchpad ............................................................................. 83
USER_DATA_00, USER_DATA_01, USER_DATA_02,
USER_DATA_03, USER_DATA_04, MFR_LTC_RESERVED_1
and MFR_LTC_RESERVED_2 ................................................... 83
Applications Information ....................................................84
Overview ......................................................................................... 84
Powering the LTC2975.................................................................... 84
Setting Command Register Values ................................................. 84
MEASURING INPUT CURRENT....................................................... 84
MEASURING INPUT VOLTAGE ........................................................ 86
MEASURING INPUT POWER .......................................................... 86
Measuring INPUT ENERGY ............................................................. 86
Sequence, Servo, Margin and Restart Operations ......................... 86
Command Units On or Off ......................................................... 86
On Sequencing .......................................................................... 87
On State Operation .................................................................... 87
Servo Modes ............................................................................. 87
DAC Modes ................................................................................ 87
Margining .................................................................................. 88
Off Sequencing .......................................................................... 88
V
OUT
Off Threshold Voltage ...................................................... 88
Automatic Restart via MFR_RESTART_DELAY Command and
CONTROL Pin ............................................................................ 88
Fault Management .......................................................................... 89
Output Overvoltage, Undervoltage, Overcurrent and
Undercurrent Faults................................................................... 89
Output Overvoltage, Undervoltage, and Overcurrent Warnings 89
Configuring the AUXFAULTB Output ......................................... 89
Multi-Channel Fault Management ............................................. 89
Interconnect Between Multiple LTC POWER MANAGERS.............. 91
Application Circuits......................................................................... 91
Trimming and Margining DC/DC Converters with
External Feedback Resistors ..................................................... 91
Four-Step Resistor Selection Procedure for DC/DC Converters
with External Feedback Resistors ............................................. 93
Trimming and Margining DC/DC Converters with a TRIM Pin .. 93
Two-Step Resistor and DAC Full-Scale Voltage Selection
Procedure for DC/DC Converters with a TRIM Pin ................... 94
Measuring Output with a Sense Resistor .................................. 94
Measuring Output with Inductor DCR ....................................... 94
Single Phase Design Example ................................................... 95
Measuring Multiphase Currents ................................................ 95
Multiphase Design Example ...................................................... 95
Anti-aliasing Filter Considerations ............................................ 95
Sensing Negative Voltages ........................................................ 96
Connecting the USB to I
2
C/SMBus/PMBus Controller to the
LTC2975 in System ................................................................... 96
Accurate DCR Temperature Compensation .................................... 97
LTpowerPlay: An Interactive GUI for Power Managers................. 100
PCB Assembly and Layout Suggestions....................................... 101
Bypass Capacitor Placement................................................... 101
Exposed Pad Stencil Design.................................................... 101
PCB Board Layout ................................................................... 101
Unused ADC Sense Inputs ...................................................... 101
Design Checklist ........................................................................... 102
I
2
C............................................................................................ 102
Output Enables ........................................................................ 102
V
IN
Sense................................................................................. 102
Input Current Sense ................................................................ 102
Logic Signals ........................................................................... 102
Floating Inputs......................................................................... 102
Package Description ....................................................... 103
Typical Application ......................................................... 104
Related Parts ................................................................ 104
For more information
www.linear.com/LTC2975
3
2975f
LTC2975
absoluTe MaxiMuM raTings
(Notes 1, 2)
pin conFiguraTion
64 V
SENSEM1
63 V
SENSEP1
62 V
SENSEM2
61 V
SENSEP2
60 GND
59 GND
58 V
DAC3
57 V
DAC2
56 I
IN_SNSM
55 I
IN_SNSP
54 V
DAC1
53 V
DAC0
52 GND
51 V
IN_SNS_CAP
50 V
SENSEM3
49 V
SENSEP3
V
SENSEP0
1
V
SENSEM0
2
V
OUT_EN0
3
V
OUT_EN1
4
V
OUT_EN2
5
V
OUT_EN3
6
AUXFAULTB 7
DNC 8
V
IN_SNS
9
V
PWR
10
V
DD33
11
V
DD33
12
V
DD25
13
V
DD25
14
T
SENSE0
15
T
SENSE1
16
65
GND
48 I
SENSEM3
47 I
SENSEP3
46 I
SENSEM2
45 I
SENSEP2
44 I
SENSEM1
43 I
SENSEP1
42 I
SENSEM0
41 I
SENSEP0
40 REFM
39 GND
38 REFP
37 GND
36 ASEL1
35 ASEL0
34 T
SENSE3
33 CONTROL1
TOP VIEW
Supply Voltages:
V
PWR
...................................................... –0.3V to 15V
V
DD33
.................................................... –0.3V to 3.6V
V
DD25
.................................................. –0.3V to 2.75V
Digital Input/Output Voltages:
ALERTB, SDA, SCL, CONTROL0, CONTROL1,
CONTROL2, CONTROL3 ....................... –0.3V to 3.6V
PWRGD, SHARE_CLK, WDI/RESETB,
WP, FAULTB0, FAULTB1........................ –0.3V to 3.6V
ASEL0, ASEL1 ....................................... –0.3V to 3.6V
Analog Voltages:
REFP ................................................... –0.3V to 1.35V
REFM .................................................... –0.3V to 0.3V
V
IN_SNS
, V
IN_SNS_CAP
............................ –0.3V to 15V
I
IN_SNSP
, I
IN_SNSM
to V
IN_SNS
............... –0.3V to 0.3V
V
SENSEP[3:0]
............................................. –0.3V to 6V
V
SENSEM[3:0]
............................................. –0.3V to 6V
I
SENSEP[3:0]
............................................... –0.3V to 6V
I
SENSEM[3:0]
.............................................. –0.3V to 6V
V
OUT_EN[3:0]
, AUXFAULTB ...................... –0.3V to 15V
V
DAC[3:0]
.................................................. –0.3V to 6V
T
SENSE[3:0]
............................................ –0.3V to 3.6V
I
IN_SNSP
, I
IN_SNSM
.................................. –0.3V to 15V
Operating Junction Temperature Range:
LTC2975C ................................................ 0°C to 70°C
LTC2975I ........................................... –40°C to 105°C
Storage Temperature Range ................ –65°C to 150°C*
Maximum Junction Temperature ........................ 125°C*
*See OPERATION section for detailed EEPROM de-
rating information for junction temperatures in excess
of 105°C.
T
JMAX
= 125°C,
θ
JCtop
= 7°C/W,
θ
JCbottom
= 1°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC2975CUP#PBF
LTC2975IUP#PBF
TAPE AND REEL
LTC2975CUP#TRPBF
LTC2975IUP#TRPBF
PART MARKING*
LTC2975UP
LTC2975UP
PACKAGE DESCRIPTION
64-Lead (9mm
×
9mm) Plastic QFN
64-Lead (9mm
×
9mm) Plastic QFN
JUNCTION TEMPERATURE RANGE
0°C to 70°C
–40°C to 105°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
PWRGD 17
SHARE_CLK 18
GND 19
GND 20
GND 21
CONTROL2 22
CONTROL3 23
WDI/RESETB 24
FAULTB0 25
FAULTB1 26
T
SENSE2
27
WP 28
SDA 29
SCL 30
ALERTB 31
CONTROL0 32
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
4
2975f
For more information
www.linear.com/LTC2975
LTC2975
elecTrical characTerisTics
SYMBOL
V
PWR
I
PWR
I
VDD33
V
UVLO_VDD33
PARAMETER
V
PWR
Supply Input Operating Range
V
PWR
Supply Current
V
DD33
Supply Current
V
DD33
Undervoltage Lockout
V
DD33
Undervoltage Lockout
Hysteresis
V
DD33
Supply Input Operating Range
Regulator Output Voltage
Regulator Output Short-Circuit
Current
V
DD25
Regulator Output Voltage
Regulator Output Short-Circuit
Current
t
INIT
Initialization Time
V
PWR
= V
DD33
4.5V ≤ V
PWR
≤ 15V
V
PWR
= 4.5V, V
DD33
= 0V
3.13V ≤ V
DD33
≤ 3.47V
V
PWR
= V
DD33
= 3.47V, V
DD25
= 0V
Time from V
IN
applied until the TON_DELAY timer
starts
V
REF
= V
REFP
– V
REFM
, 0 < I
REFP
< 100µA
(Note 3)
Differential Voltage:
V
IN_ADC
= (V
SENSEPn
– V
SENSEMn
)
Single-Ended Voltage: V
SENSEMn
Current Sense Input Range
Single-Ended Voltage: I
SENSEPn
, I
SENSEMn
Differential Current Sense Voltage:
V
IN_ADC
= (I
SENSEPn
– I
SENSEMn
)
N_ADC
Voltage Sense Resolution
Current Sense Resolution
with IOUT_CAL_GAIN = 1Ω
0V ≤ V
IN_ADC
≤ 6V, READ_VOUT
0mV ≤ |V
IN_ADC
| < 16mV (Note 4)
16mV ≤ |V
IN_ADC
| < 32mV
32mV ≤ |V
IN_ADC
| < 63.9mV
63.9mV ≤ |V
IN_ADC
| < 127.9mV
127.9mV ≤ |V
IN_ADC
|
Voltage Sense Inputs V
IN_ADC
≥ 1V
Voltage Sense Inputs 0 ≤ V
IN_ADC
≤ 1V
Total Unadjusted Error
Offset Error
Conversion Time
Current Sense Inputs 20mV ≤ |V
IN_ADC
| ≤ 170mV
Current Sense Inputs |V
IN_ADC
| ≤ 20mV
I
SENSEPn
and I
SENSEMn
Inputs, V
OS
•
IOUT_CAL_
GAIN, IOUT_CAL_GAIN = 1000mΩ
V
SENSEPn
, V
SENSEMn
, V
IN_SNS
Inputs (Note 5)
I
SENSEPn
and I
SENSEMn
Inputs (Note 5)
Internal Temperature
(READ_TEMPERATURE_2) (Note 5)
t
UPDATE_ADC
Update Time
Note 5, Mfr_ein_config_hd = 0
Note 5, Mfr_ein_config_hd = 1
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
PWR
= V
IN_SNS
= 12V, V
DD33
, V
DD25
, REFP and REFM pins floating,
unless otherwise indicated. C
VDD33
= 100nF, C
VDD25
= 100nF, C
VIN_SNS_CAP
= 10nF and C
REF
= 100nF.
CONDITIONS
V
DD33
Floating (Note 2)
4.5V ≤ V
PWR
≤ 15V, V
DD33
Floating (Note 2)
3.13V ≤ V
DD33
≤ 3.47V, V
PWR
= V
DD33
V
DD33
Ramping Up, V
PWR
= V
DD33
l
l
l
l
MIN
4.5
TYP
MAX
15
UNITS
V
mA
mA
V
mV
Power Supply Characteristics
10
10
2.25
2.55
120
3.13
3.13
50
2.35
30
3.26
90
2.5
55
30
3.47
3.47
140
2.6
80
13
13
2.8
V
V
mA
V
mA
ms
Voltage Reference Characteristics
V
REF
Output Voltage
Temperature Coefficient
Hysteresis
ADC Characteristics
V
IN_ADC
Voltage Sense Input Range
0
–0.1
–0.1
–170
122
15.625
31.25
62.5
125
250
±2.5
±60
±35
6.15
24.6
24.6
190
500
6
0.1
6
170
V
V
V
mV
µV/LSB
µA/LSB
µA/LSB
µA/LSB
µA/LSB
µA/LSB
±0.25 % of Reading
mV
µV
µV
ms
ms
ms
ms
ms
±0.3 % of Reading
1.220
1.232 1.244
3
100
V
ppm/°C
ppm
TUE_ADC_
VOLT_SNS
TUE_ADC_
CURR_SNS
V
OS_ADC
t
CONV_ADC
Total Unadjusted Error
For more information
www.linear.com/LTC2975
5
2975f
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