LTC2978 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978' PDF : 64 Pages View PDF
LTC2978
Electrical Characteristics 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 and CREF = 100nF.
SYMBOL PARAMETER
CONDITIONS
MIN
Power-Supply Characteristics
VPWR
IPWR
IVDD33
VUVLO_VDD33
VPWR Supply Input Operating Range
VPWR Supply Current
VDD33 Supply Current
VDD33 Undervoltage Lockout
VDD33 Undervoltage Lockout
Hysteresis
4.5V ≤ VPWR ≤ 15V, VDD33 Floating
3.13V ≤ VDD33 ≤ 3.47V, VPWR = VDD33
VDD33 Ramping Up, VPWR = VDD33
l 4.5
l
l
l 2.35
VDD33
VDD25
tINIT
Supply Input Operating Range
Regulator Output Voltage
Regulator Output Short-Circuit Current
Regulator Output Voltage
Regulator Output Short-Circuit Current
Initialization Time
VPWR = VDD33
4.5V ≤ VPWR ≤ 15V
VPWR = 4.5V, VDD33 = 0V
3.13V ≤ VDD33 ≤ 3.47V
VPWR = VDD33 = 3.47V, VDD25 = 0V
Time from VIN Applied Until the
TON_DELAY Timer Starts
l 3.13
l 3.13
l
75
l 2.35
l
30
Voltage Reference Characteristics
VREF
Output Voltage
Temperature Coefficient
Hysteresis
(Note 3)
ADC Characteristics
VIN_ADC
Voltage Sense Input Range
Current Sense Input Range (Odd
Numbered Channels Only)
Differential Voltage:
l
VIN_ADC = (VSENSEPn – VSENSEMn)
Single-Ended Voltage: VSENSEMn
l
Single-Ended Voltage: VSENSEPn, VSENSEMn l
Differential Voltage: VIN_ADC
l
0
–0.1
–0.1
–170
TYP
10
10
2.55
120
3.26
90
2.5
55
135
1.232
3
100
MAX
UNITS
15
V
13
mA
13
mA
2.8
V
mV
3.47
V
3.47
V
140
mA
2.6
V
80
mA
ms
V
ppm/°C
ppm
6
V
0.1
V
6
V
170
mV
N_ADC
Voltage Sense Resolution (Uses L16 0V ≤ VIN_ADC ≤ 6V
Format)
Current Sense Resolution (Odd
Numbered Channels Only)
0mV ≤ |VIN_ADC| < 16mV (Note13)
16mV ≤ |VIN_ADC| < 32mV
32mV ≤ |VIN_ADC| < 63.9mV
63.9mV ≤ |VIN_ADC| < 127.9mV
127.9mV ≤ |VIN_ADC|
TUE_ADC Total Unadjusted Error
VIN_ADC ≥ 1.8V (Note 4 )
l
INL_ADC Integral Nonlinearity
Voltage Sense Mode (Note 5)
l
Current Sense Mode, Odd Numbered
l
Channels Only, 15.6µV/LSB (Note 5)
DNL_ADC Differential Nonlinearity
Voltage Sense Mode
l
Current Sense Mode, Odd Numbered
l
Channels Only
VOS_ADC
Offset Error
Voltage Sense Mode
l
Current Sense Mode, Odd Numbered
l
Channels Only
GAIN_ADC Gain Error
Voltage Sense Mode, VIN_ADC = 6V
l
Current Sense Mode, Odd Numbered
l
Channels Only, VIN_ADC = ±0.17V
122
15.625
31.25
62.5
125
250
±0.25
±854
±31.3
±400
±31.3
±250
±35
±0.2
±0.2
µV/LSB
µV/LSB
µV/LSB
µV/LSB
µV/LSB
µV/LSB
%
µV
µV
µV
µV
µV
µV
%
%
2978fd
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5
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