Analog Devices Linear ADI Power LTM4681 Manual page 21

PIN FUNCTIONS
VTRIM1_CFG (C9): Output Voltage Select Pin for V
Fine Setting. Works in combination with VOUT1_CFG to
affect the VOUT_COMMAND (and associated output volt-
age monitoring and protection/fault-detection thresholds)
of channel 1, at SV power-up. (See VOUT1_CFG and
IN_01
the Applications Information section.) A resistor divider
from 2.5V to SGND connected to the pin will set the TRIM
value. See Table 2. Minimize capacitance especially when
the pin is left open to assure accurate detection of the
pin state. Note that use of R
VTRIM1_CFG can affect the V
PWM_MODE1[1]) and loop gain. For addressed ASEL_01,
Page 0x00 corresponds to channel 0 and Page 0x01 cor-
responds to Channel 1. See PAGE description section.
VOUT2_CFG (AA8): Output Voltage Select Pin for V
Coarse Setting. If the VOUT2_CFG and VTRIM2_CFG pins
are both left open—or, if the LTM4681 is configured to
ignore pin-strap (R
CONFIG
ALL[6] = 1b—then the LTM4681s target V
voltage setting (VOUT_COMMAND0) and associated
power-good and OV/UV warning and fault thresholds are
dictated at SV power-up according to the LTM4681's
IN_23
NVM contents. A resistor divider connected to 2.5V and
to SGND to this pin—in combination with resistor pin
settings on VTRIM2_CFG, and using the factory-default
NVM setting of MFR_CONFIG_ALL[6] = 0b—can be used
to configure the LTM4681's channel 2 output to power-
up to a VOUT_COMMAND value (and associated output
voltage monitoring and protection/fault-detection thresh-
olds) different from those of NVM contents. (See the
Applications Information section.) Connecting resistor(s)
from VOUT2_CFG to SGND and/or VTRIM2_CFG to SGND
in this manner allows a convenient way to configure mul-
tiple LTM4681s with identical NVM contents for different
output voltage settings all without GUI intervention or
the need to custom-preprogram module NVM contents.
Minimize capacitance especially when the pin is left open
to assure accurate detection of the pin state. Note that use
of R s on VOUT2_CFG/VTRIM2_CFG can affect the
CONFIG
V range setting (MFR_PWM_MODE0[1]) and loop
OUT2
gain.For addressed ASEL_23, Page 0x00 corresponds to
channel 2 and Page 0x01 corresponds to Channel 3. See
PAGE description section.
s on VOUT1_CFG/
CONFIG
range setting (MFR_
OUT1
) resistors, i.e., MFR_CONFIG_
output
OUT2
For more information
, VTRIM2_CFG (AB10): Output Voltage Select Pin for V
OUT1
Fine Setting. Works in combination with VOUT2_CFG to
affect the VOUT_COMMAND (and associated output volt-
age monitoring and protection/fault-detection thresholds)
of channel 2, at SV
the Applications Information section.) A resistor divider
from 2.5V to SGND connected to the pin will set the TRIM
value. See Table 2. Minimize capacitance especially when
the pin is left open to assure accurate detection of the
pin state. Note that use of R
VTRIM2_CFG can affect the V
PWM_MODE0[1]) and loop gain. For addressed ASEL_23,
Page 0x00 corresponds to channel 2 and Page 0x01 cor-
responds to Channel 3. See PAGE description section.
, VOUT3_CFG (AB8): Output Voltage Select Pin for V
OUT2
Coarse Setting. If the VOUT3_CFG and VTRIM3_CFG pins
are both left open—or, if the LTM4681 is configured to
ignore pin-strap (R
ALL[6] = 1b—then the LTM4681s target V
voltage setting (VOUT_COMMAND1) and associated
power-good and OV/UV warning and fault thresholds are
dictated at SV
IN_23
NVM contents. A resistor divider connected to 2.5V and
to SGND to this pin—in combination with resistor pin
settings on VTRIM3_CFG, and using the factory-default
NVM setting of MFR_CONFIG_ALL[6] = 0b—can be used
to configure the LTM4681's channel 3 output to power-
up to a VOUT_COMMAND value (and associated output
voltage monitoring and protection/fault-detection thresh-
olds) different from those of NVM contents. (See the
Applications Information section.) Connecting resistor(s)
from VOUT3_CFG to SGND and/or VTRIM3_CFG to SGND
in this manner allows a convenient way to configure mul-
tiple LTM4681s with identical NVM contents for different
output voltage settings all without GUI intervention or
the need to custom-preprogram module NVM contents.
Minimize capacitance especially when the pin is left open
to assure accurate detection of the pin state. Note that use
of R s on VOUT3_CFG/VTRIM3_CFG can affect the
CONFIG
V range setting (MFR_PWM_MODE1[1]) and loop
OUT3
gain. For addressed ASEL_23, Page 0x00 corresponds to
channel 2 and Page 0x01 corresponds to Channel 3. See
PAGE description section.
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LTM4681
power-up. (See VOUT2_CFG and
IN_23
s on VOUT2_CFG/
CONFIG
range setting (MFR_
OUT2
) resistors, i.e., MFR_CONFIG_
CONFIG
power-up according to the LTM4681's
,
OUT2
,
OUT3
output
OUT3
Rev. A
21