Datasheet

LTC3880/LTC3880-1
7
3880fc
For more information www.linear.com/LTC3880
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. (Note 2) V
IN
= 12V, V
RUN0,1
= 3.3V, f
SYNC
= 500kHz (externally
driven) unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Voltage Readback
N Resolution (Note 5) 10 Bits
V
IFS
Full-Scale Voltage (Note 11) 38.91 V
V
IN_TUE
Total Unadjusted Error V
VIN
> 4.5V (Note 8)
l
0.5
2
%
%
t
CONVERT
Conversion Time (Note 6) 100 ms
Output Current Readback
N Resolution
LSB Step Size
(Note 5)
0V ≤ |V
ISENSE
+
– V
ISENSE
–
| < 16mV
16mV ≤ |V
ISENSE
+
– V
ISENSE
–
| < 32mV
32mV ≤ |V
ISENSE
+
– V
ISENSE
–
| < 63.9mV
63.9mV ≤ |V
ISENSE
+
– V
ISENSE
–
| < 127.9mV
10
15.625
31.25
62.5
125
Bits
µV
µV
µV
µV
I
FS
Full-Scale Current (Note 7) R
ISENSE
= 1mΩ ±128 A
I
OUT_TUE
Total Unadjusted Error (Note 8) V
ISENSE
> 6mV (Note 15)
l
±1 %
V
OS
Zero-Code Offset Voltage ±28 µV
t
CONVERT
Conversion Time (Note 6) 100 ms
Input Current and Duty Cycle Readback
D_RES Resolution 10 Bits
D_TUE Total Unadjusted Error 16.3% Duty Cycle –3 3 %
t
CONVERT
Update Rate (Note 6) 100 ms
Temperature Readback (T0, T1, T2)
T
RES_T
Resolution 0.25 °C
T0,1_TUE External TSNS TUE
∆V
TSNS
= 72mV (Note 8)
l
±3 °C
T2_TUE Internal TSNS TUE V
RUN0,1
= 0.0V, f
SYNC
= 0kHz (Note 8) ±1 °C
t
CONVERT_T
Update Rate (Note 6) 120 ms
INTV
CC
Regulator
V
INTVCC
Internal V
CC
Voltage No Load (LTC3380) 6V < V
IN
< 24V
l
4.8 5 5.2 V
V
LDO_INT
INTV
CC
Load Regulation (LTC3380) I
CC
= 0mA to 50mA 0.5 ±2 %
V
DD33
Regulator
V
DD33
Internal V
DD33
Voltage 4.5V < V
INTVCC
/V
EXTVCC
l
3.2 3.3 3.40 V
I
LIM(VDD33)
V
DD33
Current Limit V
DD33
= GND 70 mA
V
DD33_OV
V
DD33
Overvoltage Threshold 3.5 V
V
DD33_UV
V
DD33
Undervoltage Threshold 3.1 V
V
DD25
Regulator
V
DD25
Internal V
DD25
Voltage
l
2.25 2.5 2.75 V
I
LIM(VDD25)
V
DD25
Current Limit V
DD25
= GND 50 mA