Datasheet LTM4611 (Analog Devices) - 10

LTM4611
operaTion Power Module Description
Pul ing the RUN pin below 1.1V forces the regulator into a The LTM4611 is a high performance single output stand- shutdown state. The TRACK/SS pin is used for program- alone nonisolated switching mode DC/DC power supply. ming the output voltage ramp and voltage tracking during It can provide a 15A output with few external input and start-up. See the Application Information section. output capacitors. This module provides precisely regu- The LTM4611 is internal y compensated to be stable over lated output voltages programmable via external resistors all operating conditions. Table 5 provides a guideline for from 0.8VDC to 5VDC over a 1.5V to 5.5V input range. The input and output capacitances for several operating con- typical application schematic is shown in Figure 21. ditions. The Linear Technology µModule Power Design The LTM4611 has an integrated constant-frequency cur- Tool will be provided for transient and stability analysis. rent mode regulator, power MOSFETs, 0.2µH inductor The VFB pin is used to program the output voltage with a and other supporting discrete components. The nominal single external resistor to ground. switching frequency range is from 330kHz to 780kHz, and A remote sense amplifier is provided for accurately sensing the default operating frequency is 500kHz. For switching output voltages ≤3.7V at the load point. noise-sensitive applications, it can be external y syn- Multiphase operation can be easily employed with the chronized from 360kHz to 710kHz. See the Applications synchronization inputs using an external clock source. Information section. See the Typical Applications. With current mode control and internal feedback loop High efficiency at light loads can be accomplished with compensation, the LTM4611 module has sufficient stabil- selectable Burst Mode operation using the MODE_PLLIN ity margins and good transient performance with a wide pin. These light-load features will accommodate battery range of output capacitors, even with all ceramic output operation. Efficiency graphs are provided for light-load capacitors. operation in the Typical Performance Characteristics Current mode control provides cycle-by-cycle fast current section. limit in an overcurrent condition. An internal overvoltage monitor protects the output voltage in the event of an overvoltage >7.5%. The top MOSFET is turned off and the bottom MOSFET is turned on until the output is cleared. 4611fb 10 For more information www.linear.com/LTM4611 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