Datasheet LTM4637 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | 20A DC/DC µModule Step-Down Regulator |
| Pages / Page | 30 / 7 — pin FuncTions. PACKAGE ROW AND COLUMN LABELING MAY VARY. VFB (F12):. … |
| File Format / Size | PDF / 624 Kb |
| Document Language | English |
pin FuncTions. PACKAGE ROW AND COLUMN LABELING MAY VARY. VFB (F12):. AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
Model Line for this Datasheet
Text Version of Document
LTM4637
pin FuncTions PACKAGE ROW AND COLUMN LABELING MAY VARY VFB (F12):
The Negative Input of the Error Amplifier.
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
Internally, this pin is connected to VOUT_LCL with a
LAYOUT CAREFULLY.
60.4k precision resistor. Different output voltages can
VIN (A1-A6, B1-B6, C1-C6):
Power Input Pins. Apply be programmed with an additional resistor between VFB input voltage between these and GND pins. Recommend and ground pins. In PolyPhase® operation, tying the placing input decoupling capacitance directly between VFB pins together allows for parallel operation. See the VIN and GND pins. Applications Information section.
VOUT (J1-J10, K1-K11, L1-L11, M1-M11):
Power Output
COMP (A11):
Current Control Threshold and Error Amplifier Pins. Apply output load between these and GND pins. Rec- Compensation Point. The current comparator threshold ommend placing output decoupling capacitance between increases with this control voltage. Tie all COMP pins these pins and GND pins. Review Table 5. together for parallel operation. The device is internally
GND (B7, B9, C7, C9, D1-D6, D8, E1-E7, E9, F1-F9, G1-G9,
compensated.
H1-H9):
Power Ground Pins for Both Input and Output.
RUN: (A10)
Run Control Pin. A voltage above 1.4V will turn
PGOOD (F11, G12):
Output Voltage Power Good Indica- on the module. A 5.1V Zener diode to ground is internal tor. Open-drain logic output is pulled to ground when the to the module for limiting the voltage on the RUN pin to output voltage exceeds a ±10% regulation window. Both 5V, and allowing a pull-up resistor to VIN for enabling the pins are tied together internally. device. Limit current into the RUN pin to ≤ 2mA.
SGND (G11, H11, H12):
Signal Ground Pin. Return
INTVCC: (A7, D9)
Internal 5V LDO for Driving the Control ground path for all analog and low power circuitry. Tie a Circuitry and the Power MOSFET Drivers. Both pins are single connection to the output capacitor GND. See layout internally connected. The 5V LDO has a 100mA current guidelines in Figure 21. limit. INTVCC is controlled and enabled when RUN is activated high.
TEMP (D10):
Temperature Monitor. See Applications Information section.
EXTVCC (E12):
External power input to an internal control switch allows an external source greater than 4.7V, but less
MODE_PLLIN (A8):
Forced Continuous Mode, Burst Mode than 6V to supply IC power and bypass the internal INTVCC Operation, or Pulse-Skipping Mode Selection Pin and LDO. EXTVCC must be less than VIN at all times during External Synchronization Input to Phase Detector Pin. power-on and power-off sequences. See the Applications Connect this pin to INTVCC to enable pulse-skipping mode. Information section. 5V output application can connect the Connect to ground to enable forced continuous mode. 5V output to this pin to improve efficiency. The 5V output Floating this pin will enable Burst Mode operation. A clock is connected to EXTVCC in the 5V derating curves. on this pin wil enable synchronization with forced continu- ous operation. See the Applications Information section.
VOUT_LCL: (L12)
This pin connects to VOUT through a 1M resistor, and to VFB with a 60.4k resistor. The remote sense
fSET (B12):
A resistor can be applied from this pin to amplifier output DIFF_OUT is connected to VOUT_LCL, and ground to set the operating frequency, or a DC voltage drives the 60.4k top feedback resistor in remote sensing can be applied to set the frequency. See the Applications applications. When the remote sense amplifier is used, Information section. DIFF_OUT effectively eliminates the 1MΩ from VOUT to
TRACK/SS (A9):
Output Voltage Tracking Pin and Soft- VOUT_LCL. When the remote sense amplifier is not used, Start Inputs. The pin has a 1.2µA pull-up current source. A then connect VOUT_LCL to VOUT directly. capacitor from this pin to ground will set a soft-start ramp rate. In tracking, the regulator output can be tracked to a different voltage. See the Applications Information section. 4637fc For more information www.linear.com/LTM4637 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 Package PHOTO Typical Application Related Parts Design Resources
pin FuncTions PACKAGE ROW AND COLUMN LABELING MAY VARY VFB (F12):
The Negative Input of the Error Amplifier.
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
Internally, this pin is connected to VOUT_LCL with a
LAYOUT CAREFULLY.
60.4k precision resistor. Different output voltages can
VIN (A1-A6, B1-B6, C1-C6):
Power Input Pins. Apply be programmed with an additional resistor between VFB input voltage between these and GND pins. Recommend and ground pins. In PolyPhase® operation, tying the placing input decoupling capacitance directly between VFB pins together allows for parallel operation. See the VIN and GND pins. Applications Information section.
VOUT (J1-J10, K1-K11, L1-L11, M1-M11):
Power Output
COMP (A11):
Current Control Threshold and Error Amplifier Pins. Apply output load between these and GND pins. Rec- Compensation Point. The current comparator threshold ommend placing output decoupling capacitance between increases with this control voltage. Tie all COMP pins these pins and GND pins. Review Table 5. together for parallel operation. The device is internally
GND (B7, B9, C7, C9, D1-D6, D8, E1-E7, E9, F1-F9, G1-G9,
compensated.
H1-H9):
Power Ground Pins for Both Input and Output.
RUN: (A10)
Run Control Pin. A voltage above 1.4V will turn
PGOOD (F11, G12):
Output Voltage Power Good Indica- on the module. A 5.1V Zener diode to ground is internal tor. Open-drain logic output is pulled to ground when the to the module for limiting the voltage on the RUN pin to output voltage exceeds a ±10% regulation window. Both 5V, and allowing a pull-up resistor to VIN for enabling the pins are tied together internally. device. Limit current into the RUN pin to ≤ 2mA.
SGND (G11, H11, H12):
Signal Ground Pin. Return
INTVCC: (A7, D9)
Internal 5V LDO for Driving the Control ground path for all analog and low power circuitry. Tie a Circuitry and the Power MOSFET Drivers. Both pins are single connection to the output capacitor GND. See layout internally connected. The 5V LDO has a 100mA current guidelines in Figure 21. limit. INTVCC is controlled and enabled when RUN is activated high.
TEMP (D10):
Temperature Monitor. See Applications Information section.
EXTVCC (E12):
External power input to an internal control switch allows an external source greater than 4.7V, but less
MODE_PLLIN (A8):
Forced Continuous Mode, Burst Mode than 6V to supply IC power and bypass the internal INTVCC Operation, or Pulse-Skipping Mode Selection Pin and LDO. EXTVCC must be less than VIN at all times during External Synchronization Input to Phase Detector Pin. power-on and power-off sequences. See the Applications Connect this pin to INTVCC to enable pulse-skipping mode. Information section. 5V output application can connect the Connect to ground to enable forced continuous mode. 5V output to this pin to improve efficiency. The 5V output Floating this pin will enable Burst Mode operation. A clock is connected to EXTVCC in the 5V derating curves. on this pin wil enable synchronization with forced continu- ous operation. See the Applications Information section.
VOUT_LCL: (L12)
This pin connects to VOUT through a 1M resistor, and to VFB with a 60.4k resistor. The remote sense
fSET (B12):
A resistor can be applied from this pin to amplifier output DIFF_OUT is connected to VOUT_LCL, and ground to set the operating frequency, or a DC voltage drives the 60.4k top feedback resistor in remote sensing can be applied to set the frequency. See the Applications applications. When the remote sense amplifier is used, Information section. DIFF_OUT effectively eliminates the 1MΩ from VOUT to
TRACK/SS (A9):
Output Voltage Tracking Pin and Soft- VOUT_LCL. When the remote sense amplifier is not used, Start Inputs. The pin has a 1.2µA pull-up current source. A then connect VOUT_LCL to VOUT directly. capacitor from this pin to ground will set a soft-start ramp rate. In tracking, the regulator output can be tracked to a different voltage. See the Applications Information section. 4637fc For more information www.linear.com/LTM4637 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 Package PHOTO Typical Application Related Parts Design Resources
