LTM4643 datasheet(6/32 Pages) LINER

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LTM4643

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PIN FUNCTIONS

VOUT1 (A1, A2, A3), VOUT2 (C1, D1, D2), VOUT3 (F1,

G1, G2), VOUT4 (J1, K1, K2): Power Output Pins of Each

Switching Mode Regulator Channel. Apply output load

between these pins and GND pins. Recommend placing

outputdecouplingcapacitancedirectlybetweenthesepins

and GND pins. See the Applications Information section

for paralleling outputs.

GND (A4-A5, B1-B2, C5, D3-D5, E1-E2, F5, G3-G5,

H1-H2, J5, K3-K4, L1-L2): Power Ground Pins for Both

Input and Output Returns. Use large PCB copper areas to

connect all GND together.

VIN1 (B3, B4), VIN2 (E3, E4), VIN3 (H3, H4), VIN4 (L3, L4):

Power input pins connect to the drain of the internal top

MOSFET for each switching mode regulator channel.

Apply input voltages between these pins and GND pins.

Recommendplacinginputdecouplingcapacitancedirectly

between each of VIN pins and GND pins.

PGOOD1, PGOOD2, PGOOD3, PGOOD4 (C3, C2, F2,

J2): Output Power Good with Open-Drain Logic of Each

Switching Mode Regulator Channel. PGOOD is pulled to

ground when the voltage on the FB pin is not within ±10%

of the internal 0.6V reference.

CLKOUT (J3): Output Clock Signal for PolyPhase® Opera-

tion of the Module. The phase of CLKOUT with respect to

CLKIN is set to 180°. CLKOUT’s peak-to-peak amplitude

is INTVCC to GND. See the Application Information section

for details. Strictly output; do not drive this pin.

INTVCC1, INTVCC2, INTVCC3, INTVCC4 (C4, F4, J4, K5):

Internal 3.3V Regulator Output of Each Switching Mode

Regulator Channel. The internal power drivers and con-

trol circuits are powered from this voltage. Each pin is

internally decoupled to GND with 1µF low ESR ceramic

capacitor already.

SVIN1, SVIN2, SVIN, SVIN4 (B5, E5, H5, L5): Signal VIN.

Filtered input voltage to the internal 3.3V regulator for

the control circuitry of each Switching mode Regulator

Channel. Tie this pin to the VIN pin respectively in most

applications. Connect SVIN to an external voltage supply

of at least 4V which must also be greater than VOUT.

TRACK/SS1, TRACK/SS2, TRACK/SS3, TRACK/SS4 (A6,

D6, G6, K6): Output Tracking and Soft-Start Pin of Each

Switching Mode Regulator Channel. Allows the user to

control the rise time of the output voltage. Putting a volt-

age below 0.6V on this pin bypasses the internal reference

input to the error amplifier, instead it servos the FB pin

to match the TRACK voltage. Above 0.6V, the tracking

function stops and the internal reference resumes control

of the error amplifier. There’s an internal 2.5µA pull-up

current from INTVCC on this pin, so putting a capacitor

here provides soft-start function.

MODE1, MODE2, MODE3, MODE4 (B6, E6, H6, L6):

Operation Mode Select for Each Switching Mode Regula-

tor Channel. Tie this pin to INTVCC to force continuous

synchronous operation at all output loads. Tying it to

SGND enables discontinuous current mode operation at

light loads. Do not leave floating.

RUN1, RUN2, RUN3, RUN4 (C6, F6, J6, K7): Run Control

Input of Each Switching Mode Regulator Channel. Enable

regulator operation by tying the specific RUN pin above

1.2V. Pulling it below 1.1V shuts down the respective

regulator channel. Do not leave floating.

FB1, FB2, FB3, FB4 (A7, D7, G7, J7): The Negative Input

of the Error Amplifier for Each Switching Mode Regulator

Channel. Internally, this pin is connected to VOUT of each

channel with a 60.4kΩ precision resistor. Different output

voltages can be programmed with an additional resistor

between the FB and GND pins. In PolyPhase operation,

tying the FB pins together allows for parallel operation.

See the Applications Information section for details.

PACKAGE ROW AND COLUMN LABELING MAY VARY

AMONG µModule PRODUCTS. REVIEW EACH PACKAGE

LAYOUT CAREFULLY.

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