Analog Devices LTM4683 Manual page 11

ELECTRICAL CHARACTERISTICS
turn relate to Channel 0, 2 (V
OUT0,2
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: V (DC) and line and load regulation tests are performed in
OUTn
production with digital servo disengaged (MFR_PWM_MODEn[6] = 0b),
and low V range selected MFR_PWM_MODEn[1] = 1b. The digital
OUTn
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 V
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 SV
READ_VIN command code; output currents (I
READ_IOUTn command codes; module input current (I
I ), accessed through the READ_IIN command code; channel input
SVIN_nn
currents (I + 1/2 • I ), accessed through the MFR_READ_IINn
VIN_nn SVIN_nn
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.
), and Channel 1, 3 (V ). Registers
OUT1, 3
, V , and T
IN OUT
), accessed through the
IN_nn
), accessed through the
OUTn
+ I
VIN_nn VIN_nn
For more information
Note 11: The absolute maximum rating for the SV
voltage telemetry (READ_VIN) is obtained by digitizing a voltage scaled
down from the SV
IN_nn
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
A
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.
62
56
50
43
37
31
+ 25
19
12
6
0
0
Figure 1. Programmable R
www.analog.com
LTM4683
pin is 16V. Input
IN_nn
pin.
5 10 15 20 25 30
CODE
4683 F01
COMPn
35
Rev. 0
11