Datasheet LTM4604A (Analog Devices) - 7

LTM4604A
pin FuncTions PACKAGE ROW AND COLUMN LABELING MAY VARY COMP (G1):
Current Control Threshold and Error Amplifier
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
Compensation Point. The current comparator threshold
LAYOUT CAREFULLY.
increases with this control voltage. Two power modules
VIN (B1, C1, C3-C7, D7, E6 and E7):
Power Input Pins. can current share when this pin is connected in parallel Apply input voltage between these pins and GND pins. with the adjacent module’s COMP pin. Recommend placing input decoupling capacitance directly between V
PGOOD (F1):
Output Voltage Power Good Indicator. Open- IN pins and GND pins. drain logic output that is pulled to ground when the output
VOUT (D8-D11, E8-E11, F6-F11, G6-G11):
Power Output voltage is not within ±7.5% of the regulation point. Pins. Apply output load between these pins and GND pins. Recommend placing output decoupling capacitance
RUN/SS (D1):
Run Control and Soft-Start Pin. A voltage directly between these pins and GND pins. Review Table 4. 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
GND (G3-G5, F3-F5, E4-E5, A1-A11, B6-B11, C8-C11):
a 1000pF capacitor to GND. The voltage on the RUN/SS Power Ground Pins for Both Input and Output Returns. pin clamps the control loop’s current comparator thresh-
TRACK (E1):
Output Voltage Tracking Pin. When the module old. A RUN/SS pin voltage of 2.375V upon completion of is configured as a master output, then a soft-start capaci- soft-start guarantees the regulator can deliver full output tor is placed on the RUN/SS pin to ground to control the current. To tun off the module while VIN remains active, the master ramp rate. Slave operation is performed by putting RUN/SS pin should be pulled low with a falling edge ≤ 1µs a resistor divider from the master output to ground, and to ensure the device does not transition slowly through connecting the center point of the divider to this pin on the internal undervoltage lockout threshold. See the the slave regulator. If tracking is not desired, then connect Applications Information section for soft-start information. the TRACK pin to VIN. Load current must be present for
SW (B3 and B4):
Switching Node of the circuit is used for tracking. See the Applications Information section. testing purposes. This can be connected to copper on the
FB (G2):
The Negative Input of the Error Amplifier. Inter- board to improve thermal performance. Make sure not to nally, this pin is connected to V connect it to other output pins. OUT 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. 4604afc For more information www.linear.com/LTM4604A 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Revision History Package Photograph Related Parts