Datasheet LTM4630 (Analog Devices) - 7

LTM4630
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. See Note 8 in resistor. Different output voltages can be programmed the Electrical Characteristics section for output current with an additional resistor between VFB and GND pins. In 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 pins. master of the two channels, then a capacitor from this pin Recommend placing output decoupling capacitance di- to ground will set a soft-start ramp rate. The remaining rectly between these pins and GND pins. Review Table 4. channel can be set up as the slave, and have the master’s See Note 8 in the Electrical Characteristics section for output applied through a voltage divider to the slave output current guideline. output’s track pin. This voltage divider is equal to the slave output’s feedback divider for coincidental tracking.
VOUTS1, VOUTS2 (C5, C8):
This pin is connected to the top See 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 output Applications Information section. voltage. See the Applications Information section.
fSET (C6):
Frequency Set Pin. A 10µA current is sourced
DIFFN (E9):
Negative input of the remote sense amplifier. from this pin. A resistor from this pin to ground sets a This pin is connected to the remote sense point of the voltage that in turn programs the operating frequency. output GND. See the Applications Information section. Alternatively, this pin can be driven with a DC voltage
MODE_PLLIN (F4):
Force Continuous Mode, Burst Mode that can set the operating frequency. See the Applications Operation, or Pulse-Skipping Mode Selection Pin and Information section. External Synchronization Input to Phase Detector Pin.
SGND (C7, D6, G6-G7, F6-F7):
Signal Ground Pin. Return Connect this pin to SGND to force both channels into ground path for all analog and low power circuitry. Tie a force continuous mode of operation. Connect to INTVCC single connection to the output capacitor GND in the ap- to enable pulse-skipping mode of operation. Leaving the plication. See layout guidelines in Figure 22. pin floating will enable Burst Mode operation. A clock on the pin will force both channels into continuous mode of operation and synchronized to the external clock applied to this pin. 4630fa For more information www.linear.com/LTM4630 7 Document Outline Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description Related Parts