Datasheet LTM4611 (Analog Devices) - 7

LTM4611
pin FuncTions VIN (A1-A6, B1-B6, C1-C6):
Power Input Pins. Apply input
VFB (F12):
The Negative Input of the Error Amplifier. voltage between these pins and GND pins. Recommend Internal y, this pin is connected to VOUT_LCL with a 60.4k placing input decoupling capacitance directly between VIN precision resistor. Different output voltages can be pro- pins and GND pins. grammed with an additional resistor between the VFB and
V
GND pins. In PolyPhase® operation, tying the V
OUT (J1-J10, K1-K11, L1-L11, M1-M11):
Power Output FB pins Pins. Apply output load between these pins and GND together allows for paral el operation. See the Applications pins. Recommend placing output decoupling capacitance Information section for details. directly between these pins and GND pins. Review Table 5.
TRACK/SS (A9):
Output Voltage Tracking Pin and Soft-
GND (B7, B9, C7, C9, D1-D6, D8, E1-E7, E9, F1-F9, G1-G9,
Start Inputs. The pin has a 1.4µA pul -up current source.
H1-H9):
Power Ground Pins for Both Input and Output A capacitor from this pin to ground will set a soft-start Returns. ramp rate. In tracking, the regulator output can be tracked to a different voltage. The different voltage is applied to
PGOOD (F11, G12):
Output Voltage Power Good Indicator. a voltage divider then the slave output’s track pin. This Open-drain logic output that is pul ed to ground when the voltage divider is equal to the slave output’s feedback output voltage exceeds a ±5% regulation window. Both divider for coincidental tracking. Tie all TRACK/SS pins pins are tied together internal y. together for paral el operation. See the Applications In-
SGND (G11, H11, H12):
Signal Ground Pin. Return ground formation section. path for all analog and low power circuitry. Tie a single
COMP (A11):
Current Control Threshold and Error Amplifier connection to the output capacitor GND in the application. Compensation Point. The current comparator threshold See the layout guidelines in Figure 17. increases with this control voltage. Tie all COMP pins
MODE_PLLIN (A8):
Forced Continuous Mode, Burst Mode together for paral el operation. The device is internal y Operation, or Pulse-Skipping Mode Selection Pin and compensated. External Synchronization Input to Phase Detector Pin.
RUN (A10):
Run Control Pin. A voltage above 1.35V will Connect this pin to GND to force continuous mode turn on in the module. The VIN undervoltage lockout (UVLO) operation. Connect to INTVCC to enable pulse-skip- of the LTM4611 must be set with resistor networks from ping mode operation. Leaving the pin floating wil VIN to RUN and optional y from RUN to GND. Tie all RUN enable Burst Mode operation. A clock on this pin will pins together for paral el operation. enable synchronization with forced continuous operation. See the Applications Information section.
INTVCC (A7, D9):
Internal 5V LDO for Driving the Control Circuitry and the Power MOSFET Drivers. Both pins are
PLLFLTR/fSET (B12):
Phase-Locked Loop Lowpass internally connected. Filter for the Internal Phase Detector. LTM4611’s default switching frequency is 500kHz. Its switching frequency
VOUT_LCL (L12):
This pin connects to VOUT through a 1M can be increased by connecting a resistor from this pin to resistor and to VFB with a 60.4k resistor. The remote sense INTV amplifier output DIFFV CC, or decreased by connecting a resistor from this OUT is connected to VOUT_LCL, and pin to SGND. See the Applications Information section. drives the 60.4k top feedback resistor in remote sensing applications. When the remote sense amplifier is used, the DIFF_VOUT effectively eliminates the 1MΩ from VOUT to VOUT_LCL. When the remote sense amplifier is not used, then connect VOUT_LCL to VOUT directly. 4611fb For more information www.linear.com/LTM4611 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 Photograph Package Description Revision History Typical Application Related Parts