SLLA673 March   2025 MCF8315A , MCF8315C , MCF8315D , MCF8316A , MCF8316C-Q1 , MCF8316D

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 MCF8315 Block Diagram and Pin Functions Introduction
  5. 2Fan Application Hardware Architecture
    1. 2.1 Total Discrete Hardware Design
    2. 2.2 MCU+Pre-Driver and External FET Design
    3. 2.3 All in One Design
  6. 3MCF8315 Hardware Design Guide for Fan Application
    1. 3.1 MCF8315 Power Part Design
    2. 3.2 MCF8315 Function Part Design
    3. 3.3 MCF8315 Communication and Output Part Design
    4. 3.4 MCF8315 Schematic Design Reference
    5. 3.5 MCF8315 Simplifies Peripheral Design
    6. 3.6 MCF8315 Thermal Performance Test
      1. 3.6.1 MCF8315 TSSOP Thermal Test With Inductance Version
  7. 4Summary
  8. 5References

MCF8315 Power Part Design

According to the pin definition requirements of the data sheet, the design requirements are as follows:

Table 3-1 MCF8315 Power Part Design
PinDescription
VM>10uf capacitor to ground and 100nf capacitor to ground, with a withstand voltage twice that of VM input.
VM,CPConnect a 1µF, 16V capacitor between CP and VM
CPH,CPLConnect a 47nF capacitor between CPH and CPL, with a withstand voltage twice that of VM input.
AVDDExternal 1uF capacitor to ground(Can be 1uF/2.2uF,>500nF across voltage and temperature)
DVDDExternal 1uF capacitor to ground(Can be 1uF/2.2uF,>500nF across voltage and temperature)
SW_BUCKSelect the resistance/inductance value according to the load
Table 3-2 Recommended Settings for Buck Regulator
Buck ModeBuck output voltageMax output current from AVDD (IAVDD_MAX)Max output current from Buck (IBK_MAX)Buck current limitAVDD power sequencing
Inductor - 47μH3.3V or 4V or 5V or 5.7V20mA170mA600mA (BUCK_CL = 0b)Not supported (BUCK_PS_DIS = 1b)
Inductor - 47μH5V or 5.7V20mA170mA - IAVDD600mA (BUCK_CL = 0b)Supported (BUCK_PS_DIS = 0b)
Inductor - 22μH3.3V or 4V or 5V or 5.7V20mA20mA150mA (BUCK_CL = 1b)Not supported (BUCK_PS_DIS = 1b)
Inductor - 22μH5V or 5.7V20mA20mA - IAVDD150mA (BUCK_CL = 1b)Supported (BUCK_PS_DIS = 0b)
Resistor - 22Ω3.3V or 4V or 5V or 5.7V20mA10mA150mA (BUCK_CL = 1b)Not supported (BUCK_PS_DIS = 1b)
Resistor - 22Ω5V or 5.7V20mA10mA - IAVDD150mA (BUCK_CL = 1b)Supported (BUCK_PS_DIS = 0b)