LTM4630A PIN FUNCTIONS (Recommended to Use Test Points to Monitor Signal Pin Connections.)PACKAGE ROW AND COLUMN LABELING MAY VARYAMONG µModule PRODUCTS. REVIEW EACH PACKAGELAYOUT CAREFULLY.VOUT1 (A1-A5, B1-B5, C1-C4): Power Output Pins. Apply VFB1, VFB2 (D5, D7): The Negative Input of the Error output load between these pins and GND pins. Recom- Amplifier for each channel. Internally, this pin is con- mend placing output decoupling capacitance directly nected to VOUTS1 or VOUTS2 with a 60.4kΩ precision between these pins and GND pins. Review Table 6 for resistor. Different output voltages can be programmed output capacitance requirement. See Table 1 for output with an additional resistor between VFB and GND pins. In current guideline. PolyPhase® operation, tying the VFB pins together allows GND (A6-A7, B6-B7, D1-D4, D9-D12, E1-E4, E10-E12, for parallel operation. See the Applications Information F1-F3, F10-F12, G1, G3, G10, G12, H1-H7, H9-H12, J1, section for details. J5, J8, J12, K1, K5-K8, K12, L1, L12, M1 , M12): Power TRACK1, TRACK2 (E5, D8): Output Voltage Tracking Pin Ground Pins for Both Input and Output Returns. and Soft-Start Inputs. Each channel has a 1.3µA pull-up V current source. When one channel is configured to be OUT2 (A8-A12, B8-B12, C9-C12): Power Output Pins. Apply output load between these pins and GND master of the two channels, then a capacitor from this pin pins. Recommend placing output decoupling ca- to ground will set a soft-start ramp rate. The remaining pacitance directly between these pins and GND pins. channel can be set up as the slave, and have the master’s Review Table 6 for output capacitance requirement. output applied through a voltage divider to the slave out- See Table 1 for output current guideline. put’s track pin. This voltage divider is equal to the slave output’s feedback divider for coincidental tracking. See VOUTS1, VOUTS2 (C5, C8): This pin is connected to the top the Applications Information section. of the internal top feedback resistor for each output. The pin can be directly connected to its specific output, or COMP1, COMP2 (E6, E7): Current control threshold and connected to DIFFOUT when the remote sense amplifier error amplifier compensation point for each channel. The is used. In paralleling modules, one of the V current comparator threshold increases with this control OUTS pins is connected to the DIFFOUT pin in remote sensing or directly voltage. Tie the COMP pins together for parallel operation. to V The device is internal compensated. OUT with no remote sensing. It is very important to connect these pins to either the DIFFOUT or VOUT since DIFFP (E8): Positive input of the remote sense amplifier. this is the feedback path, and cannot be left open. See the This pin is connected to the remote sense point of the Applications Information section. output voltage. Diffamp can be used for ≤ 3.3V outputs. f See the Applications Information section. SET (C6): Frequency Set Pin. A 10µA current is sourced from this pin. A resistor from this pin to ground sets a DIFFN (E9): Negative input of the remote sense amplifier. voltage that in turn programs the operating frequency. This pin is connected to the remote sense point of the Alternatively, this pin can be driven with a DC voltage output GND. Diffamp can be used for ≤ 3.3V outputs. See that can set the operating frequency. See the Applications the Applications Information section. Information section. SGND (C7, D6, G6-G7, F6-F7): Signal Ground Pin. Return ground path for all analog and low power circuitry. Tie a single connection to the output capacitor GND in the ap- plication. See layout guidelines in Figure 12. 4630afb For more information www.linear.com/LTM4630A 7 Document Outline Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Related Parts