Datasheet LTM4627 (Analog Devices) - 10

LTM4627
OPERATION Power Module Description
The LTM4627 is a high performance single output stand- overvoltage >10%. The top MOSFET is turned off and the alone nonisolated switching mode DC/DC power supply. bottom MOSFET is turned on until the output is cleared. It can provide a 15A output with few external input and Pulling the RUN pin below 1.1V forces the regulator into a output capacitors. This module provides precisely regulated shutdown state. The TRACK/SS pin is used for program- output voltages programmable via external resistors from ming the output voltage ramp and voltage tracking during 0.6VDC to 5VDC over a 4.5V to 20V input range. The typical start-up. See the Application Information section. application schematic is shown in Figure 18. The LTM4627 is internally compensated to be stable over The LTM4627 has an integrated constant-frequency cur- all operating conditions. Table 4 provides a guideline for rent mode regulator, power MOSFETs, 0.47µH inductor, input and output capacitances for several operating condi- and other supporting discrete components. The switch- tions. LTpowerCAD™ is available for transient and stability ing frequency range is from 400kHz to 770kHz, and the analysis. The V typical operating frequency is 500kHz. For switching FB pin is used to program the output voltage with a single external resistor to ground. noise-sensitive applications, it can be externally syn- chronized from 250kHz to 800kHz, subject to minimum A remote sense amplifier is provided for accurately sensing on-time limitations. A single resistor is used to program output voltages ≤3.3V at the load point. the frequency. See the Applications Information section. Multiphase operation can be easily employed with the With current mode control and internal feedback loop synchronization inputs using an external clock source. compensation, the LTM4627 module has sufficient stabil- See application examples. ity margins and good transient performance with a wide High efficiency at light loads can be accomplished with range of output capacitors, even with all ceramic output selectable Burst Mode operation using the MODE_PLLIN capacitors. pin. These light load features will accommodate battery Current mode control provides cycle-by-cycle fast current operation. Efficiency graphs are provided for light load op- limit in an overcurrent condition. An internal overvoltage eration in the Typical Performance Characteristics section. monitor protects the output voltage in the event of an 4627fc 10 For more information www.linear.com/LTM4627 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