LTM4682 datasheet(22/130 Pages) AD

22 / 130 page

LTM4682

Rev. A

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VOSNS2– (R8): Channel 2 Negative Differential Voltage

Sense Input. See VOSNS2+.

IIN_23+ (R9): Positive Current Sense Amplifier Input. If

the input current sense amplifier is not used, this pin

must be shorted to the IIN_23– and SVIN_23 pin. See the

Applications Information section for more details about

the input current sensing.

VOSNS3+ (R11): Channel 3 Positive Differential Voltage

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

Kelvin-sense the VOUT3 output voltage at VOUT3’s 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: 0.75V)—or, optionally, may be set by configu-

ration 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

purposes or EMI-snubbing. It may be routed a short dis-

tance to a local test point to monitor 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 the rec-

ommended output capacitors from this 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

LTM4682. These open-drain output pins hold the pin low

until the LTM4682 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 LTM4682 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 through I2C or power-cycling SVIN_23 is neces-

sary 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 programming the EEPROM.

VDD33_23 (Y10): Internally Generated 3.3V Power Supply

Output Pin for Channels 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.

VDD33_23 can be powered from VBIAS, such that this con-

troller 2 can be programmed with RUNn low.

PIN FUNCTIONS

LTM4682 Datasheet(PDF) 22 Page - Analog Devices

LTM4682 Datasheet(HTML) 22 Page - Analog Devices

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