Datasheet LTM4650-1 (Analog Devices) - 7

link to page 25 LTM4650-1
pin FuncTions (Recommended to Use Test Points to Monitor Signal Pin Connections.) PACKAGE ROW AND COLUMN LABELING MAY VARY AMONG µModule PRODUCTS. REVIEW EACH PACKAGE LAYOUT 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. Recommend Amplifier for Each Channel. Internally, this pin is con- placing output decoupling capacitance directly between nected to VOUTS1 or VOUTS2 with a 60.4kΩ precision these pins and GND pins. Review Table 4. resistor. Different output voltages can be programmed
GND (A6-A7, B6-B7, D1-D4, D9-D12, E1-E4, E10-E12,
with an additional resistor between VFB and GND pins. In
F1-F3, F10-F12, G1, G3, G10, G12, H1-H7, H9-H12, J1,
PolyPhase® operation, tying the VFB pins together allows
J5, J8, J12, K1, K5-K8, K12, L1, L12, M1 , M12):
Power for parallel operation. See the Applications Information Ground Pins for Both Input and Output Returns. section for details.
V TRACK1, TRACK2 (E5, D8):
Output Voltage Tracking Pin
OUT2 (A8-A12, B8-B12, C9-C12):
Power Output Pins. Apply output load between these pins and GND pins. Rec- and Soft-Start Inputs. Each channel has a 1.3µA pull-up ommend placing output decoupling capacitance directly current source. When one channel is configured to be between these pins and GND pins. Review Table 4. master of the two channels, then a capacitor from this pin to ground will set a soft-start ramp rate. The remaining
VOUTS1, VOUTS2 (C5, C8):
This pin is connected to the top channel can be set up as the slave, and have the master’s of the internal top feedback resistor for each output. The output applied through a voltage divider to the slave out- pin can be directly connected to its specific output, or put’s track pin. This voltage divider is equal to the slave connected to DIFFOUT when the remote sense amplifier output’s feedback divider for coincidental tracking. See is used. In paralleling modules, one of the VOUTS pins is the Applications Information section. connected to the DIFFOUT pin in remote sensing or directly to V
COMP1, COMP2 (E6, E7):
Current control threshold and OUT with no remote sensing. It is very important to connect these pins to either the DIFFOUT or V error amplifier compensation point for each channel. The OUT since this is the feedback path, and cannot be left open. See the current comparator threshold increases with this control Applications Information section. voltage. COMP pin internal has 10pF filter cap to SGND. An external RC filter circuit is required for control loop
fSET (C6):
Frequency Set Pin. A 10µA current is sourced compensation. See Applications Information section. Tie from this pin. A resistor from this pin to ground sets a the COMP pins together for parallel operation. Do not voltage that in turn programs the operating frequency. drive this pin. Alternatively, this pin can be driven with a DC voltage that can set the operating frequency. See the Applications
DIFFP (E8):
Positive input of the remote sense amplifier. Information section. This pin is connected to the remote sense point of the output voltage. See the Applications Information section.
SGND (C7, D6, G6-G7, F6-F7):
Signal Ground Pin. Return ground path for all analog and low power circuitry. Tie a
DIFFN (E9):
Negative input of the remote sense amplifier. single connection to the output capacitor GND in the ap- This pin is connected to the remote sense point of the plication. See layout guidelines in Figure 13. output GND. See the Applications Information section. 46501fc For more information www.linear.com/LTM4650-1 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Revision History Package Photo Design Resources Related Parts