Analog Devices LTM4683 Manual page 22

LTM4683
PIN FUNCTIONS
+
V (R11): Channel 3 Positive Differential Voltage
OSNS3
Sense Input. Together, V
Kelvin-sense the V output voltage at V
OUT3
of-load (POL) and provide the differential feedback signal
directly to Channel 3's feedback loop. Command V
target regulation voltage by serial bus. Its initial command
value at SV power-up is dictated by NVM contents
IN_23
(factory default: 0.5V)—or, optionally, may be set by con-
figuration resistors; see VOUT3_CFG, VTRIM3_CFG and
the Applications Information section.
–
V (T11): Channel 3 Negative Differential Voltage
OSNS3
+
Sense Input. See V
OSNS3
SW3 (V1-V2, W1-W2, Y1-Y2): Switching Node of
Channel 3 Step-Down Converter Stage. Used for test pur-
poses or EMI-snubbing. It may be routed a short distance
to a local test point to monitor the switching action of
Channel 3, if desired, but do not route near any sensitive
signals. Otherwise, leave it open.
V (V13-V15, W13-W15, Y13-Y15, AA13-AA15,
OUT3
AB13-AB15): Channel 3 Output Voltage. Place recom-
mended output capacitors from this output copper shape
to GND. See the Layout Checklist/Example section.
RUN2, RUN3 (Y9, Y8): Enable Run Input for Channels 2
and 3, respectively. Open-drain input and output. The logic
22
+ –
and V serve to
OSNS3 OSNS3
's point-
OUT3
OUT3
.
For more information
high on these pins enables the respective outputs of the
LTM4683. These open-drain output pins hold the pin low
until the LTM4683 is out of reset and SV
to exceed V . A pull-up resistor to 3.3V is required in
IN_ON
the application. The LTM4683 pulls RUN2 and/or RUN3
's
low, as appropriate, when a global fault and/or channel-
specific fault occurs whose fault response is configured to
latch off and cease regulation, issuing a CLEAR_FAULTS
2
command via I C or power-cycling SV
to restart the module, in such cases. Do not pull RUN
logic high with a low impedance source. INTV
when SVIN_23 is above UVLO. This provides power to
the V and V
DD33 DD25
EEPROM.
V (Y10): Internally Generated 3.3V Power Supply
DD33_23
Output Pin for Channel 2 and Channel 3 Circuits. This pin
should only be used to provide external current for the
pull-up resistors required for FAULTn, SHARE_CLK_nn,
and SYNC_nn, and may be used to provide external cur-
rent 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 decou-
pling is required. V
so this controller 2 can be programmed with RUNn low.
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IN_23
is necessary
IN_23
to allow the programming of the
can be powered from V
DD33_23
is detected
is active
CC
,
BIAS
Rev. 0