The MK9218 operates over a wide input voltage range from 6V to 100V. With appropriate high-side and low-side MOSFET and Inductance, the MK9218 delivers up to 30A output current. The MK9218 adopts a voltage mode control architecture to achieve excellent accurate voltage output.
The switching frequency is adjustable up to 1 MHz, which also can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications. MK9218 support Forced-PWM (FPWM) and Diode Emulation Mode; FPWM operation eliminates switching frequency variation to minimize EMI, while user selectable diode emulation lowers current consumption at light-load condition.
MK9218 is offered with wide duty cycle from 1% to 98% under appropriate switching frequency, so input and output voltage can easy to be choose. The MK9218 provides a power good (PG) flag pin to indicate output voltage.
Features MK9218 IC
- Wide Input Voltage 6V-100V
- Adjustable output from 0.8V to 60V
- 40ns ton(min) for low duty ratio
- 190ns toff(min) for high duty ratio
- Precision ±1% Feedback Reference
- Adjustable FSW from 100kHz to 1MHz
- Configuration diode emulation or FPWM
- 2.5A source and 3.5A sink driver ability
- Prebias start-up
- SYNCI and SYNCO capability
- Open-Drain Power Good Indicator
- Adjustable output voltage soft start
- Input UVLO with hysteresis
- VCC and BOOT UVLO protection
- OC, OT Protection with Hiccup Mode
- QFN20L 4.5mm x 3.5mm Package with
- Thermal PAD
Replace LM25145/LM5145/LM5146
Schematic MK9218 Synchronous Buck DC/DC Controller
About this circuit
- Input voltage: designed for 13-25V
- Output voltage constant at 12V
- Maximum output current of 10A
- Model MK9218CQB
- Driving current above 2A.
BOM MK9218 Synchronous Buck DC/DC Controller
| Parts | Value | Description | Quantity |
| Resistors | |||
| RB | 1.27K | R0402 – SMD Resistor | 1 |
| RCO | 1.91K | R0402 – SMD Resistor | 1 |
| REB,RPG,RUP1 | 20K | R0402 – SMD Resistor | 3 |
| RET1 | 33.2K | R0402 – SMD Resistor | 1 |
| RF | 1.37K | R0402 – SMD Resistor | 1 |
| RFS | 39.2K | R0402 – SMD Resistor | 1 |
| RIL | 715 | R0402 – SMD Resistor | 1 |
| RT | 18kΩ | R0402 – SMD Resistor | 1 |
| RVI | 2 | R0402 – SMD Resistor | 1 |
| Capacitors | |||
| CBS | 100nF | C0603- – SMD Capacitor | 1 |
| CI1 | 100uF/35V | Polymer Aluminum Capacitor | 1 |
| CI2,CI3,CI4,CI5,CO2,CO3,CO4,CO5 | 22uF/16V | C1210 – SMD Capacitor | 8 |
| CO1 | 470uF/25V | Polymer Aluminum Capacitor | 1 |
| CVC | 2.2uF | C0603 – SMD Capacitor | 1 |
| CCO1 | 8.2nF | C0402 – SMD Capacitor | 1 |
| CCO2 | 680pF | C0402 – SMD Capacitor | 1 |
| CF | 560pF | C0402 – SMD Capacitor | 1 |
| CSS | 47nF | C0402 – SMD Capacitor | 1 |
| CVI | 100nF | C0402 – SMD Capacitor | 1 |
| Semiconductors | |||
| QB | CSD18540Q5B | 60V 100A N-Channel VSON-8(5×6) MOSFET | 1 |
| QT | NTMFS5C670NLT1G | 60V 35A N-Channel DFN-5(5×6) MOSFET | 1 |
| LPG | VLMG1500-GS08 | 20mA Green 0402 LED | 1 |
| U1 | MK9218CQB | VQFN-20 100V Synchronous Buck DC/DC Controller | 1 |
| Miscellaneous | |||
| DC1 | DC-042C-W-2.0 | 6.3mm DC Power Connector | 1 |
| SW1 | SK-3296S-01-L3 | Horizontal attachment Single Pole Double Throw (SPDT) SMD Slide Switch | 1 |
| XT-OUT | XT30PW-M | Socket XT30 male 2 pin 15A 500V | 1 |
| L1 | 10uH | 10uH 15A SMD-3P 15.5×15.5mm Power Inductor | 1 |
Download files, links, and notes
- Download PCB in Gerber + BOM + Centroid file + PDF + PNG + SVG
- Mirror
- PDF Datasheet MK9218
- BUY IC MK9218
Source: https://oshwhub.com/LoveTombSeries/LoveTomb624
