LTM4614

6

4614fa

PIN FUNCTIONS

Pins. Apply input voltage between these pins and GND

pins. Recommend placing input decoupling capacitance

D9-D12, E9-E12, F9-F12): Power Output Pins. Apply out-

put load between these pins and GND pins. Recommend

placing output decoupling capacitance directly between

these pins and GND pins. Review Table 4.

GND1, GND2, (G1-G12, H1, H7-H12, J7-J8, K7-K8, L1,

L7-L8, M1-M8); (A1-A12, B1, B7-B12, C7-C8, D7-D8,

E1, E7-E8, F1-F8): Power Ground Pins for Both Input

and Output Returns.

TRACK1, TRACK2 (L3, E3): Output Voltage Tracking Pins.

When the module is configured as a master output, then a

soft-start capacitor is placed on the RUN/SS pin to ground

to control the master ramp rate, or an external ramp can

be applied to the master regulator’s track pin to control it.

Slave operation is performed by putting a resistor divider

from the master output to the ground, and connecting the

center point of the divider to this pin on the slave regulator.

If tracking is not desired, then connect the TRACK pin to

plications Information section.

FB1, FB2 (L6, E6): The Negative Input of the Switching

Regulators’ Error Amplifier. Internally, these pins are con-

output voltages can be programmed with an additional

resistor between the FB and GND pins. Two power modules

can current share when this pin is connected in parallel

with the adjacent module’s FB pin. See Applications In-

formation section.

COMP1, COMP2 (L5, E5): Current Control Threshold

and Error Amplifier Compensation Point. The current

comparator threshold increases with this control voltage.

Two power modules can current share when this pin is

connected in parallel with the adjacent module’s COMP

pin. Each channel has been internally compensated. See

Applications Information section.

PGOOD1, PGOOD2 (L4, E4): Output Voltage Power

Good Indicator. Open-drain logic output that is pulled to

ground when the output voltage is not within ±7.5% of

the regulation point.

RUN/SS1, RUN/SS2 (L2, E2): Run Control and Soft-Start

Pin. A voltage above 0.8V will turn on the module, and below

0.5V will turn off the module. This pin has a 1M resistor

Information section for soft-start information.

SW1, SW2 (H2-H6, B2-B6): The switching node of the

circuit is used for testing purposes. This can be connected to

copper on the board for improved thermal performance.