LTM4604AV View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTM4604AV' PDF : 22 Pages View PDF
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 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 the 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 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 thresh-
old. A RUN/SS pin voltage of 2.375V upon completion of
soft-start guarantees the regulator can deliver full output
current. 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.
For more information www.linear.com/LTM4604A
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