Datasheet LTM4614 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | Dual 4A per Channel Low VIN DC/DC µModule Regulator |
| Pages / Page | 20 / 6 — pin FuncTions. PGOOD1, PGOOD2 (L4, E4):. RUN/SS1, RUN/SS2 (L2, E2):. FB1, … |
| File Format / Size | PDF / 380 Kb |
| Document Language | English |
pin FuncTions. PGOOD1, PGOOD2 (L4, E4):. RUN/SS1, RUN/SS2 (L2, E2):. FB1, FB2 (L6, E6):. COMP1, COMP2 (L5, E5):
Model Line for this Datasheet
Text Version of Document
LTM4614
pin FuncTions
Slave operation is performed by putting a resistor divider
PGOOD1, PGOOD2 (L4, E4):
Output Voltage Power from the master output to the ground, and connecting the Good Indicator. Open-drain logic output that is pulled to center point of the divider to this pin on the slave regulator. ground when the output voltage is not within ±7.5% of If tracking is not desired, then connect the TRACK pin to the regulation point. VIN. Load current must be present for tracking. See the
RUN/SS1, RUN/SS2 (L2, E2):
Run Control and Soft-Start Applications Information section. Pins. A voltage above 0.9V will turn on the module, and
FB1, FB2 (L6, E6):
The Negative Input of the Switching below 0.6V will turn off the module. This pin has a 1M Regulators’ Error Amplifier. Internally, these pins are con- resistor to VIN and a 1000pF capacitor to GND. The volt- nected to VOUT with a 4.99k precision resistor. Different age on the RUN/SS pin clamps the control loop’s current output voltages can be programmed with an externally comparator threshold. A RUN/SS pin voltage of 2.375V connected resistor between the FB and GND pins. Two upon completion of soft-start guarantees the regulator can power modules can current share when this pin is con- deliver full output current. To turn off the module while nected in parallel with the adjacent module’s FB pin. See VIN remains active, the RUN/SS pin should be pulled low the Applications Information section. with a falling edge ≤ 1µs to ensure the device does not
COMP1, COMP2 (L5, E5):
Current Control Threshold transition slowly through the internal undervoltage lockout and Error Amplifier Compensation Point. The current threshold. See Applications Information section for soft- comparator threshold increases with this control voltage. start information. Two power modules can current share when this pin is
SW1, SW2 (H2-H6, B2-B6):
The switching node of the connected in parallel with the adjacent module’s COMP circuit is used for testing purposes. This can be connected pin. Each channel has been internally compensated. See to copper on the board for improved thermal performance. the Applications Information section.
siMpliFieD block DiagraM
PGOOD VIN VIN 2.375V TO 5.5V 4.7µF 22µF 6.3V 6.3V RSS 1M RUN/SS C C SSEXT SS 1000pF M1 0.47µH V V CONTROL, DRIVE OUT OUT TRACK 4.99k TRACK 1.5V POWER FETS SUPPLY C2 4.7µF 4A M2 5.76k COMP 470pF 6.3V 100µF R1 X5R INTERNAL 4.99k COMP GND FB SW R 4614 F01 FB 5.76k
Figure 1. Simplified LTM4614 Block Diagram of Each Switching Regulator Channel
4614fb 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Package Description Revision History Package Photograph Related Parts
pin FuncTions
Slave operation is performed by putting a resistor divider
PGOOD1, PGOOD2 (L4, E4):
Output Voltage Power from the master output to the ground, and connecting the Good Indicator. Open-drain logic output that is pulled to center point of the divider to this pin on the slave regulator. ground when the output voltage is not within ±7.5% of If tracking is not desired, then connect the TRACK pin to the regulation point. VIN. Load current must be present for tracking. See the
RUN/SS1, RUN/SS2 (L2, E2):
Run Control and Soft-Start Applications Information section. Pins. A voltage above 0.9V will turn on the module, and
FB1, FB2 (L6, E6):
The Negative Input of the Switching below 0.6V will turn off the module. This pin has a 1M Regulators’ Error Amplifier. Internally, these pins are con- resistor to VIN and a 1000pF capacitor to GND. The volt- nected to VOUT with a 4.99k precision resistor. Different age on the RUN/SS pin clamps the control loop’s current output voltages can be programmed with an externally comparator threshold. A RUN/SS pin voltage of 2.375V connected resistor between the FB and GND pins. Two upon completion of soft-start guarantees the regulator can power modules can current share when this pin is con- deliver full output current. To turn off the module while nected in parallel with the adjacent module’s FB pin. See VIN remains active, the RUN/SS pin should be pulled low the Applications Information section. with a falling edge ≤ 1µs to ensure the device does not
COMP1, COMP2 (L5, E5):
Current Control Threshold transition slowly through the internal undervoltage lockout and Error Amplifier Compensation Point. The current threshold. See Applications Information section for soft- comparator threshold increases with this control voltage. start information. Two power modules can current share when this pin is
SW1, SW2 (H2-H6, B2-B6):
The switching node of the connected in parallel with the adjacent module’s COMP circuit is used for testing purposes. This can be connected pin. Each channel has been internally compensated. See to copper on the board for improved thermal performance. the Applications Information section.
siMpliFieD block DiagraM
PGOOD VIN VIN 2.375V TO 5.5V 4.7µF 22µF 6.3V 6.3V RSS 1M RUN/SS C C SSEXT SS 1000pF M1 0.47µH V V CONTROL, DRIVE OUT OUT TRACK 4.99k TRACK 1.5V POWER FETS SUPPLY C2 4.7µF 4A M2 5.76k COMP 470pF 6.3V 100µF R1 X5R INTERNAL 4.99k COMP GND FB SW R 4614 F01 FB 5.76k
Figure 1. Simplified LTM4614 Block Diagram of Each Switching Regulator Channel
4614fb 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Package Description Revision History Package Photograph Related Parts
