LTM4604A datasheet(6/20 Pages) LINER

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LTM4604A

4604af

PIN FUNCTIONS

VIN (B1, C1, C3-C7, D7, E6 and E7): Power Input Pins.

Apply input voltage between these pins and GND pins.

Recommend placing input decoupling capacitance directly

between VIN pins and GND pins.

VOUT (D8-D11, E8-E11, F6-F11, G6-G11): Power Output

Pins. Apply output load between these pins and GND

pins. Recommend placing output decoupling capaci-

tance directly between these pins and GND pins. Review

Table 4.

GND (G3-G5, F3-F5, E4-E5, A1-A11, B6-B11, C8-C11):

Power Ground Pins for Both Input and Output Returns.

TRACK (E1): Output Voltage Tracking Pin. When the module

is conﬁgured as a master output, then a soft-start capaci-

tor is placed on the RUN/SS pin to ground to control the

master ramp rate. Slave operation is performed by putting

a resistor divider from the master output to 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 VIN. Load current must be present for

tracking. See Applications Information section.

FB (G2): The Negative Input of the Error Ampliﬁer. Inter-

nally, this pin is connected to VOUT with a 4.99k precision

resistor. Different output voltages can be programmed

with an additional resistor between 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 Information section.

COMP (G1): 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.

PGOOD (F1): 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/SS (D1): 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 to VIN and

a 1000pF capacitor to GND. See Application Information

section for soft-start information. The shut down pin

should be pull low with a falling edge of ≤ 1μs to ensure

the device does not transition slowly through the internal

under voltage lockout threshold.

SW (B3 and B4): Switching Node of the circuit is used for

testing purposes. This can be connected to copper on the

board to improve thermal performance. Make sure not to

connect it to other output pins.

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