LTM4686 datasheet(11/132 Pages) AD

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LTM4683

Rev. 0

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ELECTRICAL CHARACTERISTICS

turn relate to Channel 0, 2 (VOUT0,2), and Channel 1, 3 (VOUT1, 3). Registers

containing non-page-specific data, i.e., whose data is “global” to the

module, or applies to all of the module’s channels, lack the italicized “n”,

e.g., FREQUENCY_SWITCH.

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 output current derating curves for different VIN, VOUT, and TA,

located in the Applications Information section.

Note 7: Part tested with pulse-width modulation disabled. Evaluation

in application demonstrates capability. TUE(%) = analog-to-digital

converter (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, LTM4683 can do fast

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

Details section.

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 LTM4683’s

internal calculations use 32-bit words.

Note 11: The absolute maximum rating for the SVIN_nn pin is 16V. 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 0.3V to 0.7V are 5%.

Note 14: Tested at IC-level automatic test equipment (ATE).

Note 15: The LTM4683’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 (nonvolatile memory)—outside this temperature range

is not recommended. However, if the LTM4683’s EEPROM temperature is

less than 130°C, the LTM4683 will obey the STORE_USER_ALL command.

Only when EEPROM temperature exceeds 130°C the LTM4683 will not act

on any STORE_USER_ALL transactions; instead, the LTM4683 NACKs the

serial command and asserts its relevant CML (communications, memory,

logic) fault bits. EEPROM temperature can be queried before commanding

STORE_USER_ALL; see the Applications Information section.

Note 16: The LTM4683 includes overtemperature (OT) protection intended

to protect the device during momentary overload conditions. The junction

temperature will exceed 125°C when OT protection is active. Continuous

operation above the specified maximum operating junction temperature

may impair device reliability.

Figure 1. Programmable RCOMPn

CODE

4683 F01

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