LTM4677 datasheet(21/132 Pages) AD

21 / 132 page

LTM4681

Rev. 0

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VTRIM1_CFG (C9): Output Voltage Select Pin for VOUT1,

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 SVIN_01 power-up. (See VOUT1_CFG and

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 RCONFIGs on VOUT1_CFG/

VTRIM1_CFG can affect the VOUT1 range setting (MFR_

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 VOUT2,

Coarse Setting. If the VOUT2_CFG and VTRIM2_CFG pins

are both left open—or, if the LTM4681 is configured to

ignore pin-strap (RCONFIG) resistors, i.e., MFR_CONFIG_

ALL[6] = 1b—then the LTM4681s target VOUT2 output

voltage setting (VOUT_COMMAND0) and associated

power-good and OV/UV warning and fault thresholds are

dictated at SVIN_23 power-up according to the LTM4681’s

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 RCONFIGs on VOUT2_CFG/VTRIM2_CFG can affect the

VOUT2 range setting (MFR_PWM_MODE0[1]) and loop

gain.For addressed ASEL_23, Page 0x00 corresponds to

channel 2 and Page 0x01 corresponds to Channel 3. See

PAGE description section.

VTRIM2_CFG (AB10): Output Voltage Select Pin for VOUT2,

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 SVIN_23 power-up. (See VOUT2_CFG and

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 RCONFIGs on VOUT2_CFG/

VTRIM2_CFG can affect the VOUT2 range setting (MFR_

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 VOUT3,

Coarse Setting. If the VOUT3_CFG and VTRIM3_CFG pins

are both left open—or, if the LTM4681 is configured to

ignore pin-strap (RCONFIG) resistors, i.e., MFR_CONFIG_

ALL[6] = 1b—then the LTM4681s target VOUT3 output

voltage setting (VOUT_COMMAND3) and associated

power-good and OV/UV warning and fault thresholds are

dictated at SVIN_23 power-up according to the LTM4681’s

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 RCONFIGs on VOUT3_CFG/VTRIM3_CFG can affect the

VOUT3 range setting (MFR_PWM_MODE1[1]) and loop

gain. For addressed ASEL_23, Page 0x00 corresponds to

channel 2 and Page 0x01 corresponds to Channel 3. See

PAGE description section.

PIN FUNCTIONS

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