Datasheet

LTC3883/LTC3883-1
8
3883fa
For more information www.linear.com/LTC3883
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
RUN
= 3.3V, f
SYNC
= 500kHz (externally
driven) unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Digital Inputs SHARE_CLK, WP
V
IH
Input High Threshold Voltage
l
1.5 1.8 V
V
IL
Input Low Threshold Voltage
l
0.6 1.0 V
Leakage Current SDA, SCL, ALERT, RUN
I
OL
Input Leakage Current 0V ≤ V
PIN
≤ 5.5V
l
±5 µA
Leakage Current GPIO, PGOOD
I
GL
Input Leakage Current 0V ≤ V
PIN
≤ 3.6V
l
±2 µA
Digital Filtering of GPIO
I
FLTG
Input Digital Filtering GPIO 3 µs
Digital Filtering of RUN
I
FLTG
Input Digital Filtering RUN 10 µs
PMBus Interface Timing Characteristics
f
SCL
Serial Bus Operating Frequency
l
10 400 kHz
t
BUF
Bus Free Time Between Stop and Start
l
1.3 µs
t
HD,STA
Hold time After Repeated Start Condition.
After this Period, the First Clock is Generated
l
0.6 µs
t
SU,STA
Repeated Start Condition Setup Time
l
0.6 µs
t
SU,STO
Stop Condition Setup Time
l
0.6 µs
t
HD,DAT
Data Hold Time
Receiving Data
Transmitting Data
l
l
0
0.3 0.9
µs
µs
t
SU,DAT
Data Setup Time
Receiving Data
l
0.1 µs
t
TIMEOUT_SMB
Stuck PMBus Timer Non-Block Reads
Stuck PMBus Timer Block Reads
Measured
from the Last PMBus Start Event 32
150
ms
ms
t
LOW
Serial Clock Low Period
l
1.3 10000 µs
t
HIGH
Serial Clock High Period
l
0.6 µs
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note
2: The LTC3883/LTC3883-1 are tested under pulsed load conditions
such that T
J
≈ T
A
. The LTC3883E/LTC3883E-1 are guaranteed to meet
performance specifications from 0°C to 85°C. Specifications over the
–40°C to
105°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3883I/LTC3883I-1 are guaranteed over the full –40°C to 125°C operating
junction temperature range. T
J
is calculated from the ambient temperature,
T
A
, and power dissipation, P
D
, according to the following formula:
T
J
= T
A
+ (P
D
• θ
JA
)
The maximum ambient temperature consistent with these specifications
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors.
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 5: The data format in PMBus is 5 bits exponent (signed) and 11 bits
mantissa (signed). This limits the
output resolution to 10 bits though the
internal ADC is 16 bits and the calculations use 32-bit words.
Note 6:
The data conversion is done in round robin fashion. All inputs
signals are continuously converted for a typical latency of 120ms.
Note 7: The IOUT_CAL_GAIN = 1.0mΩ and MFR_IOUT_TC = 0.0. Value as
read from READ_IOUT in amperes.
Note 8: Part tested with PWM disabled. Evaluation in application
demonstrates capability. TUE (%) = ADC Gain Error (%) + 100 •
[Zero Code Offset + ADC Linearity Error]/Actual Value.
Note 9:
All V
OUT
commands assume the ADC is used to auto-zero the
output to achieve the stated accuracy. LTC3883 is tested in a feedback
loop that servos V
OUT
to a specified value.
Note 10: The maximum V
OUT
voltage is 5.5V.
Note 11: The maximum V
IN
voltage is 28V.
Note 12: When V
IN
< 6V, INTV
CC
must be tied to V
IN
.
Note 13: EEPROM endurance is guaranteed by design, characterization
and correlation with statistical process controls. Data retention is
production tested via a high temperature bake at wafer level.The minimum
retention specification applies for devices whose EEPROM has been cycled