LTM4604AV Ver la hoja de datos (PDF) - Analog Devices

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LTM4604AV

Low Voltage, 4A DC/DC µModule Regulator with Tracking

Analog Devices 

LTM4604A

PIN FUNCTIONS

PACKAGE ROW AND COLUMN LABELING MAY VARY

AMONG µModule PRODUCTS. REVIEW EACH PACKAGE

LAYOUT CAREFULLY.

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 capacitance

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 mod-

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

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

trol 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 the Applications Information

section.

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

Internally, this pin is connected to VOUT with a 4.99k

precision resistor. Different output voltages can be pro-

grammed with an externally connected 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 the 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. The voltage on the RUN/SS pin

clamps the control loop’s current comparator threshold.

A RUN/SS pin voltage of 2.375V upon completion of soft-

start guarantees the regulator can deliver full output cur-

rent. To tun off the module while VIN remains active, the

RUN/SS pin should be pulled low with a falling edge ≤ 1µs

to ensure the device does not transition slowly through

the internal undervoltage lockout threshold. See the

Applications Information section for soft-start information.

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.

Rev. D

For more information www.analog.com

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