LTM4673 datasheet(22/132 Pages) AD

22 / 132 page

LTM4683

Rev. 0

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VOSNS3+ (R11): Channel 3 Positive Differential Voltage

Sense Input. Together, VOSNS3+ and VOSNS3– serve to

Kelvin-sense the VOUT3 output voltage at VOUT3’s point-

of-load (POL) and provide the differential feedback signal

directly to Channel 3’s feedback loop. Command VOUT3’s

target regulation voltage by serial bus. Its initial command

value at SVIN_23 power-up is dictated by NVM contents

(factory default: 0.5V)—or, optionally, may be set by con-

figuration resistors; see VOUT3_CFG, VTRIM3_CFG and

the Applications Information section.

VOSNS3– (T11): Channel 3 Negative Differential Voltage

Sense Input. See VOSNS3+.

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.

VOUT3 (V13-V15, W13-W15, Y13-Y15, AA13-AA15,

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

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 SVIN_23 is detected

to exceed VIN_ON. A pull-up resistor to 3.3V is required in

the application. The LTM4683 pulls RUN2 and/or RUN3

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

command via I2C or power-cycling SVIN_23 is necessary

to restart the module, in such cases. Do not pull RUN

logic high with a low impedance source. INTVCC is active

when SVIN_23 is above UVLO. This provides power to

the VDD33 and VDD25 to allow the programming of the

EEPROM.

VDD33_23 (Y10): Internally Generated 3.3V Power Supply

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. VDD33_23 can be powered from VBIAS,

so this controller 2 can be programmed with RUNn low.

PIN FUNCTIONS

LTM4673 Datasheet(PDF) 22 Page - Analog Devices

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