LTM4682 datasheet(11/130 Pages) AD

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LTM4682

Rev. A

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ELECTRICAL CHARACTERISTICS

Note 5: VOUTn (DC) and line and load regulation tests are performed in

production with digital servo disengaged (MFR_PWM_MODEn[6] = 0b),

and low VOUTn range selected MFR_PWM_MODEn[1] = 1b. The digital

servo control loop is exercised in production (setting MFR_PWM_

MODEn[6] = 1b). However, the convergence of the output voltage to its

final settling value is not necessarily observed in the final test—due to

potentially long-time constants involved—and is instead guaranteed

by the output voltage readback accuracy specification. Evaluation

in application demonstrates capability; see the Typical Performance

Characteristics section.

Note 6: See the Thermal Considerations and Output Current Derating

section for VIN, VOUT, and TA, located in the Applications

Information section.

Note 7: Part tested with PWM disabled. Evaluation in application

demonstrates capability. The TUE(%) = ADC Gain Error (%) + 100 (zero-

code offset + ADC Linearity Error)/Actual Value.

Note 8: Minimum on-time is tested at wafer sort.

Note 9: The data conversion is done by default in a round-robin fashion.

All input signals are continuously converted for a typical latency of 90ms.

Setting MFR_ADC_CONTRL value to be 0 to 12, LTM4682 can do fast

data conversion with only 8ms to 10ms. See the PMBus Command

Summary section for details.

Note 10: The following telemetry parameters are formatted in PMBus-

defined Linear Data Format, in which each register contains a word

comprised of 5 most significant bits—representing a signed exponent, to

be raised to the power of 2—and 11 least significant bits—representing

a signed mantissa: input voltage (on SVIN_nn), accessed through the

READ_VIN command code; output currents (IOUTn), accessed through the

READ_IOUTn command codes; module input current (IVIN_nn + IVIN_nn +

ISVIN_nn), accessed through the READ_IIN command code; channel input

currents (IVIN_nn + 1/2 • ISVIN_nn), accessed through the MFR_READ_IINn

command codes; and duty cycles of Channel 0 and Channel 1 switching

power stages, accessed through the READ_DUTY_CYCLEn command

codes. This data format limits the resolution of telemetry readback data to

10 bits even though the internal ADC is 16 bits and the LTM4682’s internal

calculations use 32-bit words.

Note 11: The absolute maximum rating for the SVIN_nn pin is 18V. The

input voltage telemetry (READ_VIN) is obtained by digitizing a voltage

scaled down from the SVIN_nn pin.

Note 12: These typical parameters are based on bench measurements and

are not production tested.

Note 13: Channel 0 to Channel 3 OV/UV comparator threshold accuracy

for 0.7V to 1.35V are 3%.

Note 14: Tested at IC-level ATE.

Note 15: The LTM4682’s EEPROM temperature range for valid write

commands is 0°C to 85°C. To achieve guaranteed EEPROM data retention,

execution of the STORE_USER_ALL command—i.e., uploading RAM

contents to NVM—outside this temperature range is not recommended.

However, as long as the LTM4682’s EEPROM temperature is less than

130°C, the LTM4682 will obey the STORE_USER_ALL command. Only

when EEPROM temperature exceeds 130°C, the LTM4682 will not act

on any STORE_USER_ALL transactions; instead, the LTM4682 NACKs

the serial command and asserts its relevant CML (communications,

memory, logic) fault bits. The EEPROM temperature can be queried

before commanding STORE_USER_ALL; see the Applications

Information section.

Note 16: The LTM4682 includes overtemperature protection that is

intended to protect the device during momentary overload conditions. The

junction temperature will exceed 125°C when overtemperature protection

is active. Continuous operation above the specified maximum operating

junction temperature may impair device reliability.

Figure 1. Programmable RCOMPn

CODE

4682 F01

LTM4682 Datasheet(PDF) 11 Page - Analog Devices

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