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LTC2975 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC2975
Description  4-Channel PMBus Power System Manager Featuring Accurate Input Current and Energy Measurement
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2975 Datasheet(HTML) 6 Page - Linear Technology

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LTC2975
6
2975f
For more information www.linear.com/LTC2975
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VPWR = VIN_SNS = 12V, VDD33, VDD25, REFP and REFM pins floating,
unless otherwise indicated. CVDD33 = 100nF, CVDD25 = 100nF, CVIN_SNS_CAP = 10nF and CREF = 100nF.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
fIN_ADC
Input Sampling Frequency
62.5
kHz
Sense Input Current Characteristics (Note 12)
IIN_VSENSE
Input Current
VSENSEPn and VSENSEMn Inputs
l
±15
µA
Differential Input Current
VSENSEPn and VSENSEMn Inputs, VIN_DIFF = 6V
l
±30
µA
IIN_ISENSE
Input Current
ISENSEPn and ISENSEMn Inputs
l
±3
µA
Differential Input Current
ISENSEPn and ISENSEMn Inputs, |VIN_DIFF| = 0.17V
l
±5
µA
DAC Output Characteristics
N_VDAC
Resolution
10
Bits
VFS_VDAC
Full-Scale Output Voltage
(Programmable)
DAC Code = 0x3FF
DAC Polarity = 1
Buffer Gain Setting_0
Buffer Gain Setting_1
l
l
1.3
2.5
1.38
2.65
1.44
2.77
V
V
INL_VDAC
Integral Nonlinearity
(Note 6)
l
±2
LSB
DNL_VDAC
Differential Nonlinearity
(Note 6)
l
±2.4
LSB
VOS_VDAC
Offset Voltage
(Note 6)
l
±15
mV
VDAC
Load Regulation
VDACn = 2.65V, IVDACn Sourcing = 2mA
100
ppm/mA
VDACn = 0.1V, IVDACn Sinking = 2mA
100
ppm/mA
PSRR
DC: 3.13V ≤ VDD33 ≤ 3.47V, VPWR = VDD33
60
dB
Leakage Current
VDACn Hi-Z, 0V ≤ VDACn ≤ 6V
l
±100
nA
Short-Circuit Current Low
VDACn Shorted to GND
l
–12
–4
mA
Short-Circuit Current High
VDACn Shorted to VDD33
l
4
12
mA
COUT
Output Capacitance
VDACn Hi-Z
10
pF
tS_VDAC
DAC Output Update Rate
Fast Servo Mode
250
µs
Voltage Supervisor Characteristics
VIN_VS
Input Voltage Range
(Programmable)
VIN_VS = (VSENSEPn
– VSENSEMn)
Low Resolution Mode
High Resolution Mode
l
l
0
0
6
3.8
V
V
Single-Ended Voltage: VSENSEMn
l
–0.1
0.1
V
N_VS
Voltage Sensing Resolution
0V to 3.8V Range: High Resolution Mode
4
mV/LSB
0V to 6V Range: Low Resolution Mode
8
mV/LSB
TUE_VS
Total Unadjusted Error
2V ≤ VIN_VS ≤ 6V, Low Resolution Mode
l
±1.25 % of Reading
1.5V < VIN_VS ≤ 3.8V, High Resolution Mode
l
±1.0 % of Reading
0.8V ≤ VIN_VS ≤ 1.5V, High Resolution Mode
l
±1.5 % of Reading
tS_VS
Update Period
12.21
µs
Current Supervisor Characteristics
VIN_CS
Current Sense Input Range
Single-Ended Voltage: ISENSEPn, ISENSEMn
l
–0.1
6
V
Differential Voltage: VIN_CS = (ISENSEPn – ISENSEMn) l
–170
170
mV
N_CS
Current Sense Resolution
IOUT_OC_FAULT_LIMIT • IOUT_CAL_GAIN
IOUT_UC_FAULT_LIMIT • IOUT_CAL_GAIN
400
µV/LSB
TUE_CS
Total Unadjusted Error
50mV ≤ |VIN_CS| ≤ 170mV
l
±3
% of Reading
|VIN_CS| < 50mV
l
±1.5
mV
VOS_CS
Offset Error
VIN_CS = 0
l
±600
µV
tS_CS
Update Period
12.21
µs
elecTrical characTerisTics


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