Datasheet LTM4627 (Analog Devices) - 7

LTM4627
PIN FUNCTIONS VIN (A1-A6, B1-B6, C1-C6):
Power Input Pins. Apply input
TRACK/SS (A9):
Output Voltage Tracking Pin and Soft- voltage between these pins and GND pins. Recommend Start Inputs. The pin has a 1.2µA pull-up current source. placing input decoupling capacitance directly between VIN A capacitor from this pin to ground will set a soft-start pins and GND pins. ramp rate. In tracking, the regulator output can be tracked
V
to a different voltage. The different voltage is applied to
OUT (J1-J10, K1-K11, L1-L11, M1-M11):
Power Output Pins. Apply output load between these pins and GND a voltage divider then the slave output’s track pin. This pins. Recommend placing output decoupling capacitance voltage divider is equal to the slave output’s feedback directly between these pins and GND pins. Review Table 4. divider for coincidental tracking. See the Applications Information section.
GND (B7, B9, C7, C9, D1-D6, D8, E1-E7, E9, F1-F9, G1-G9, H1-H9):
Power Ground Pins for Both Input and Output
VFB (F12):
The Negative Input of the Error Amplifier. Returns. Internally, this pin is connected to VOUT_LCL with a 60.4k precision resistor. Different output voltages can
PGOOD (F11, G12):
Output Voltage Power Good Indicator. be programmed with an additional resistor between VFB Open-drain logic output that is pulled to ground when the and ground pins. In PolyPhase® operation, tying the output voltage exceeds a ±10% regulation window. Both VFB pins together allows for parallel operation. See the pins are tied together internally. Applications Information section for details.
SGND (G11, H11, H12):
Signal Ground Pin. Return ground
COMP (A11):
Current Control Threshold and Error Amplifier path for all analog and low power circuitry. Tie a single Compensation Point. The current comparator threshold connection to the output capacitor GND in the application. increases with this control voltage. Tie all COMP pins See layout guidelines in Figure 17. together for parallel operation. The device is internally
MODE_PLLIN (A8):
Forced Continuous Mode, Burst Mode compensated. Operation, or Pulse-Skipping Mode Selection Pin and
RUN: (A10)
Run Control Pin. A voltage above 1.4V will turn External Synchronization Input to Phase Detector Pin. on the module. A 5.1V Zener diode to ground is internal Connect this pin to INTVCC to enable pulse-skipping mode to the module for limiting the voltage on the RUN pin to of operation. Connect to ground to enable forced continuous 5V, and allowing a pull-up resistor to VIN for enabling the mode of operation. Floating this pin will enable Burst Mode device. Limit current into the RUN pin to ≤ 2mA. operation. A clock on this pin will enable synchronization with forced continuous operation. See the Applications
INTVCC: (A7, D9)
Internal 5V LDO for Driving the Control Information section. Circuitry and the Power MOSFET Drivers. Both pins are internally connected. The 5V LDO has a 100mA current limit.
fSET (B12):
A resistor can be applied from this pin to ground to set the operating frequency, or a DC voltage
EXTVCC (E12):
External power input to an internal control can be applied to set the frequency. See the Applications switch allows an external source greater than 4.7V, but Information section. less than 6V to supply IC power and bypass the internal INTVCC LDO. EXTVCC must be less than VIN at all times during power-on and power-off sequences. See the Ap- plications Information section. 4627fc For more information www.linear.com/LTM4627 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photos Package Description Revision History Typical Application Related Parts