MP2225 module High Efficiency Synchronous Step-Down Converter. The MP2225 is a compact, high-frequency, synchronous step-down converter with built-in power MOSFETs. It can deliver a 5A output current with excellent load and line regulation across a wide input supply range. Operating in synchronous mode for increased efficiency, it also features current-mode operation for fast transient response and easy loop stabilization. The device includes over-current protection and thermal shut down for full protection. With minimal external components required, the MP2225 is available in a space-saving 8-pin TSOT23 package.
Schematic MP2225 module High Efficiency Synchronous Step-Down Converter
Features & Benefits MP2225 module
- Wide 4.5V-to-18V Operating Input Range
- Adjustable Output Voltage as low as 0.6V
- Low 47mΩ/18mΩ RDS(ON) of Internal Power MOSFETs
- High Efficiency up to 97%
- Fixed 500kHz Switching Frequency
- Synchronizes from a 200kHz-to-2MHz External Clock
- 2.4ms Internal Soft-Start Time
- 1% Reference Accuracy at Room Temperature
- Internal Power-save Mode
- OCP with hiccup mode
- Available in 8-pin TSOT23
| Pin functions | ||
| Pin# | Name | Description |
| 1 | AGND | Analog Ground. Connect it to GND. |
| 2 | IN | Supply Voltage. The MP2225 operates from a 4.5V-to-18V input rail. Requires C1 to decouple the input rail. Connect using a wide PCB trace. |
| 3 | SW | Switch Output. Connect using a wide PCB trace. |
| 4 | GND | Power Ground. Requires special consideration during PCB layout. Connect to GND with copper traces and vias. |
| 5 | BST | Bootstrap. Requires a capacitor between SW and BST pins to form a floating supply across the high-side switch driver. |
| 6 | EN/SYNC | EN high to enable the MP2225. Can apply an externai clock to the EN pin to change the switching frequency. |
| 7 | VCC | Bias Supply. Decouple with a 0.1μF-to-0.22μF capacitor. |
| 8 | FB | Feedback. Connect to the tap of an externai resistor divider from the output to GND to set the output voltage. The frequency fold-back comparator lowers the oscillator frequency when the FB voltage is below 480mV to prevent current-limit run-away during a short-circuit fault condition. |
Setting the Output Voltage
The external resistor divider sets the output voltage.
The feedback resistor R1 also sets the feedback loop bandwidth with the internal compensation capacitor. First, choose a value for R1, R2 is then given by:
The feedback network—as shown in figure — is highly recommended.
| Vout (V) | R1 (kΩ) | R2 (kΩ) |
| 1.0 | 120 | 180 |
| 1.2 | 120 | 120 |
| 1.35 | 100 | 80.6 |
| 1.5 | 80.6 | 53.6 |
| 1.8 | 80.6 | 40.2 |
| 2.5 | 80.6 | 25.5 |
| 3.3 | 40.2 | 8.87 |
| 5 | 40.2 | 5.49 |
The recommended parameters are based on 500kHz switching frequency, different output inductors and capacitors affect the recommended values of R1 and R2.
BOM MP2225 module High Efficiency Synchronous Step-Down Converter
| Parts | Value | Description | Quantity |
| Capacitors | |||
| 22uf | C1 | C1206 – SMD capacitor | 1 |
| 0.1uf | C3, C4, C5 | C0603 – SMD capacitor | 3 |
| 22uf | C6, C7 | C0805 – SMD capacitor | 2 |
| 33pf | C9 | C0603 – SMD capacitor | 1 |
| Resistors | |||
| 100K (104) | R1 | R0603 – SMD resistor | 1 |
| 10R (10R) | R2 | R0603 – SMD resistor | 1 |
| 40.2K (4022) | R4 | R0603 – SMD resistor | 1 |
| 5.49K (5491) | R5 | R0603 – SMD resistor | 1 |
| Semiconductors | |||
| SMAJ12A | D1 | SMA 12V ESD and Surge Protection | 1 |
| MP2225GJ | U2 | Step-down type Adjustable 4.5V~18V 5A 600mV~17V TSOT-23-8 DC-DC Converter | 1 |
| Miscellaneous | |||
| 4.7uH | L1 | 2A 22uH Integrated molded inductor ±20% 3.5A SMD,6.6×7.3mm Power Inductor | 1 |
Download files, links, and notes
- Download PCB in Gerber + BOM + Centroid file + PDF
- Mirror
- BUY IC MP2225
- BUY DC DC module
- PDF Datasheet MP2225
Source: https://oshwhub.com/momololo/sun-lao-shi-_2225_2236-su-xiao-lian-xi
