Analog Devices Linear ADI Power LTM4681 Manual page 18

LTM4681
PIN FUNCTIONS
RUNP (N11): This pin enables the Internal 5.5V V
Down Regulator. Pulling this pin above 0.85V will enable
the Internal regulator. The pin is rated to V
V to enable, and tie to GND to disable. When the input
IN
voltage is between 4.5V to 5.75V, pull the RUNP pin to
GND, and connect SV
IN_01
INTV respectively.
CC_23
V (N10): 5.5V step down output that powers both
BIAS
internal controllers to reduce power loss. Provide a 22µF
ceramic bypass capacitor on this pin to GND. SV
and SV must be higher than 7V for this V
IN_23
supply the controllers. When the input voltage is between
4.5V to 5.75V, pull the RUNP pin to GND, and connect
SV and SV to INTV
IN_01 IN_23
tively. Powering up the V
and SV greater than 7V will power the INTV
IN_23
INTV , the V
CC_02 DD33_01
V from V . Otherwise these sources will get
DD25_23 BIAS
their power from SV
IN_01
gramming each internal controller's EEPROM with the
power regulator channels in the off position.
+
I (H10): Positive Current Sense Amplifier Input.
IN_01
If the input current sense amplifier is not used, this pin
must be shorted to the I
Applications Information section for detail about the
input current sensing.
–
I (J10): Negative Current Sense Amplifier Input. If
IN_01
the input current sense amplifier is not used, this pin must
+
be shorted to the I and SV
IN_01
Information section for detail about the input current sensing.
+
I (R9): Positive Current Sense Amplifier Input. If
IN_23
the input current sense amplifier is not used, this pin
must be shorted to the I
Applications Information section for detail about the
input current sensing.
–
I (P9): Negative Current Sense Amplifier Input. If
IN_23
the input current sense amplifier is not used, this pin
must be shorted to the I
Applications Information section for detail about the
input current sensing.
18
BIAS
, so tie to
IN
and SV to INTV
IN_23 CC_01
BIAS
and INTV , respec-
CC_01 CC_23
regulator with the SV
BIAS
, V , V
DD33_23 DD25_01
and SV . This will allow pro-
IN_23
–
and SV pin. See
IN_01 IN_01
pin. See Applications
IN_01
–
and SV pin. See
IN_23 IN_23
+
and SV pin. See
IN_23 IN_23
For more information
INTV (J9): Internal Regulator, 5.5V Output. When
Step
CC_01
operating the LTM4681 from 5.75V ≤ SV
internal LDO generates INTV
internal control circuits and the MOSFET drivers of the
LTM4681's channel 0 and 1. An external 4.7µF ceramic
decoupling capacitor is required. INTV
and
lated regardless of the RUNn pin state. When operating
the LTM4681 with 4.5V ≤ SV
must be electrically shorted to SV
pin must be pulled to GND. V
IN_01
when the input voltage is greater than 7V.
to
INTV (P10): Internal Regulator, 5.5V Output. When
CC_23
operating the LTM4681 from 5.75V ≤ SV
internal LDO generates INTV
internal control circuits and the MOSFET drivers of the
IN_01
LTM4681's channel 2 and 3. An external 4.7µF ceramic
,
CC_01
decoupling i capacitor s required. INTV
, and
lated regardless of the RUNn pin state. When operating
the LTM4681 with 4.5V ≤ SV
must be electrically shorted to SV
pin must be pulled to GND. V
when the input voltage is greater than 7V.
V (E8): Internally Generated 3.3V Power Supply
DD33_01
Output Pin for Channel 0 and 1 Circuits. This pin should
only be used to provide external current for the pull-up
resistors required for FAULT_nn, SHARE_CLK_nn, and
SYNC_nn, and may be used to provide external current for
pull-up resistors on RUNn, SDA_nn, SCL_nn, ALERT_nn
and PGOODn. Where nn is either 0,1 or 2,3 channels, and
n is the actual channel. No external decoupling is required.
V can be powered from V
DD33_01
troller 1 can be programmed with RUNn low.
V (Y10): Internally Generated 3.3V Power Supply
DD33_23
Output Pin for Channel 2 and 3 Circuits. This pin should
only be used to provide external current for the pull-up
resistors required for FAULT_nn, SHARE_CLK_nn, and
SYNC_nn, and may be used to provide external current for
pull-up resistors on RUNn, SDA_nn, SCL_nn, ALERT_nn
and PGOODn. Where nn is either 0,1 or 2,3 channels, and
n is the actual channel. No external decoupling is required.
V can be powered from V
DD33_23
troller 2 can be programmed with RUNn low.
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≤ 16V, an
IN_01
from SV to bias
CC_01 IN_01
is on regu-
CC_01
< 5.75V, INTV
IN_01 CC_01
, and the RUNP
IN_01
takes over after startup
BIAS
≤ 16V, an
IN_23
from SV to bias
CC_23 IN_23
is on regu-
CC_23
< 5.75V, INTV
IN_23 CC_23
, and the RUNP
IN_23
takes over after startup
BIAS
, such that this con-
BIAS
, such that this con-
BIAS
Rev. A