LTM4677 datasheet(9/116 Pages) AD

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LTC3883/LTC3883-1

Rev. F

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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 TJ ≈ TA. 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. TJ is calculated from the ambient temperature,

TA, and power dissipation, PD, according to the following formula:

TJ = TA + (PD • θJA)

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 80ms.

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 VOUT 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 VOUT to a specified value.

Note 10: The maximum VOUT voltage is 5.5V.

Note 11: The maximum VIN voltage is 28V.

Note 12: When VIN < 6V, INTVCC must be tied to VIN.

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

less than the minimum endurance specification. The RESTORE_USER_ALL

command (NVM read) is valid over the entire operating temperature range.

Note 14: The LTC3883-1 quiescent current (IQ) equals the IQ of VIN plus

the IQ of EXTVCC.

Note 15: The LTC3883 includes overtemperature protection that is

intended to protect the device during momentary overload conditions.

Junction temperature will exceed 125°C when overtemperature protection

is active. Continuous operation above the specified maximum operating

junction temperature may impair device reliability.

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TJ = 25°C (Note 2). VIN = 12V, VRUN = 3.3V, fSYNC = 500kHz (externally

driven) unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tSU,DAT

Data Setup Time

Receiving Data

0.1

µs

tTIMEOUT_SMB Stuck PMBus Timer Non-Block Reads

Stuck PMBus Timer Block Reads

Measured from the Last PMBus Start Event

150

tLOW

Serial Clock Low Period

1.3

10000

µs

tHIGH

Serial Clock High Period

0.6

µs

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