Datasheet

LTC2977
5
2977fa
For more information www.linear.com/LTC2977
ELECTRICAL CHARACTERISTICS
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 and C
REF
= 100nF.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Characteristics
V
PWR
V
PWR
Supply Input Operating Range
l
4.5 15 V
I
PWR
V
PWR
Supply Current 4.5V ≤ V
PWR
≤ 15V, V
DD33
Floating
l
10 13 mA
I
VDD33
V
DD33
Supply Current 3.13V ≤ V
DD33
≤ 3.47V, V
PWR
= V
DD33
l
10 13 mA
V
UVLO_VDD33
V
DD33
Undervoltage Lockout V
DD33
Ramping Up, V
PWR
= V
DD33
l
2.35 2.55 2.8 V
V
DD33
Undervoltage Lockout
Hysteresis
120 mV
V
DD33
Supply Input Operating Range V
PWR
= V
DD33
l
3.13 3.47 V
Regulator Output Voltage 4.5V ≤ V
PWR
≤ 15V
l
3.13 3.26 3.47 V
Regulator Output Short-Circuit Current V
PWR
= 4.5V, V
DD33
= 0V
l
75 90 140 mA
V
DD25
Regulator Output Voltage 3.13V ≤ V
DD33
≤ 3.47V
l
2.35 2.5 2.6 V
Regulator Output Short-Circuit Current V
PWR
= V
DD33
= 3.47V, V
DD25
= 0V
l
30 55 80 mA
t
INIT
Initialization Time Time from V
IN
Applied Until the
TON_DELAY Timer Starts
30 ms
Voltage Reference Characteristics
V
REF
Output Voltage V
REF
= V
REFP
– V
REFM
, 0 < I
REFP
< 100µA 1.232 V
Temperature Coefficient 3 ppm/°C
Hysteresis (Note 3) 100 ppm
ADC Characteristics
V
IN_ADC
Voltage Sense Input Range Differential Voltage:
V
IN_ADC
= (V
SENSEPn
– V
SENSEMn
)
l
0 6 V
Single-Ended Voltage: V
SENSEMn
l
–0.1 0.1 V
Current Sense Input Range (Odd
Numbered Channels Only)
Single-Ended Voltage: V
SENSEPn
, V
SENSEMn
l
–0.1 6 V
Differential Voltage: V
IN_ADC
l
–170 170 mV
N_ADC Voltage Sense Resolution Uses L16
Format
0V ≤ V
IN_ADC
≤ 6V 122 µV/LSB
Current Sense Resolution (Odd
Numbered Channels Only)
0mV ≤ |V
IN_ADC
| < 16mV (Note 11)
16mV ≤ |V
IN_ADC
| < 32mV
32mV ≤ |V
IN_ADC
| < 63.9mV
63.9mV ≤ |V
IN_ADC
| < 127.9mV
127.9mV ≤ |V
IN_ADC
|
15.625
31.25
62.5
125
250
µV/LSB
µV/LSB
µV/LSB
µV/LSB
µV/LSB
TUE_ADC_
VOLT_SNS
Total Unadjusted Error Voltage Sense Mode V
IN_ADC
≥ 1V
l
±0.25 % of
Reading
Voltage Sense Mode 0 ≤ V
IN_ADC
≤ 1V
l
±2.5 mV
TUE_ADC_
CURR_SNS
Total Unadjusted Error Current Sense Mode, Odd Numbered
Channels Only, 20mV ≤ V
IN_ADC
≤ 170mV
l
±0.7 % of
Reading
Current Sense Mode, Odd Numbered
Channels Only, V
IN_ADC
≤ 20mV
l
140 µV
V
OS_ADC
Offset Error Current Sense Mode, Odd Numbered
Channels Only
l
±35 µV
t
CONV_ADC
Conversion Time Voltage Sense Mode (Note 4) 6.15 ms
Current Sense Mode (Note 4) 24.6 ms
Temperature Input (Note 4) 24.6 ms
t
UPDATE_ADC
Maximum Update Time Odd Numbered Channels in Current Sense
Mode (Note 4)
160 ms