MIC24045 Synchronous Step-Down Regulator With I²C
The MIC24045 is an I²C-programmable, high-efficiency, wide input range, 5 A synchronous step-down regulator. The MIC24045 is perfectly suited for multiple voltage rail application environments, typically found in computing and telecommunication systems. In the MIC24045 various parameters can be programmed via I²C, such as output voltage, switching frequency, soft-start slope, margining, current limit values and start-up delays. The wide switching frequency adjustment range, valley-current mode control technique, high-performance error amplifier, and external compensation allow for the best trade-offs between high efficiency and the smallest possible solution size.
The MIC24045 supports extensive diagnostics and status information through I²C. The MIC24045 pin-out is compatible with the MIC24046 pin-strapping programmable regulator pin-out, such that I²C-based implementations can be easily converted into pin-programmable ones. The MIC24045 is available in thermally-efficient, space-saving 20-pin 3 mm x 3 mm FQFN package with an operating junction temperature range from -40 °C to +125 °C.
MIC24045 Synchronous Step-Down Regulator Application
- Servers, Data Storage, Routers and Base Stations
- FPGAs, DSP and Low-Voltage ASIC Power
MIC24045 Pin Function Table
| Pin Number | Symbol | Pin Function |
|---|---|---|
| 1, 2 | VIN | Input Voltage Pin |
| 3, 4, 13 | PGND | Power Ground Pin |
| 5, 6 | LX | Switch Node Pin |
| 7 | BST | Bootstrap Capacitor Pin. A bootstrap capacitor is connected between the BST and LX pins. |
| 8 | PG | Power Good Open-Drain Output Pin |
| 9 | ADR0 | I²C Address Programming Pin 0 |
| 10 | ADR1 | I²C Address Programming Pin 1 |
| 11 | SCL | I²C Clock Input Pin |
| 12 | SDA | I²C Data Input/Output Pin |
| 14 | AGND | Analog Ground Pin |
| 15 | COM | Transconductance Error Amplifier Output Pin. Connect the compensation network from COMP to AGND. |
| 16 | OUTSNS | Output Sensing Pin |
| 17 | EN | Precision Enable Input Pin |
| 18 | VDDA | Internal Regulator Output Pin |
| 19 | VDDP MOSFET | Drivers Internal Supply Pin |
| 20 | VINLDO | Internal Regulator Input Pin |
| 21 | VIN_EP VIN | Exposed Pad. Electrically connected to VIN. |
| 22 | PGND_EP PGND | Exposed Pad. Electrically connected to PGND. |
| 23 | LX_EP LX | Exposed Pad. Electrically connected to LX. |
MIC24045 Register Map
| Register Address | Register Name | Type | B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 |
|---|---|---|---|---|---|---|---|---|---|---|
| 0h | STATUS | RO | OCF | ThSDF | ThWrnF | Reserved | EnS | Reserved | Reserved | PGS |
| 1h | Setting1 | RW | ILIM1 | ILIM0 | Freq2 | Freq1 | Freq0 | Reserved | Reserved | Reserved |
| 2h | Setting2 | RW | Reserved | SUDly2 | SUDly1 | SUDly0 | Mrg1 | Mrg0 | SS1 | SS0 |
| 3h | VOUT | RW | VOUT7 | VOUT6 | VOUT5 | VOUT4 | VOUT3 | VOUT2 | VOUT1 | VOUT0 |
| 4h | Command | RW | Reserved | Reserved | Reserved | Reserved | Reserved | Reserved | Reserved | ClFF |
MIC24045 Evaluation Kit (Part Number: ADM00764)
The MIC24045 Evaluation Board is designed to serve all of the devices that make up Microchip’s MIC2404x family of parts. As a result, only a subset of its features is needed for the MIC24045 evaluation. Specific for the evaluation of the MIC24045 device, the VIN supply ranges from 4.5 V to 19 V and output voltage from 0.64 V to 5.25 V in 5 mV, 10 mV, 30 mV and 50 mV steps at 5 A. Additionally, an on-board load transient generator circuit and connections for loop gain measurements are provided. A connector (J10) matching the MCP2221 Breakout Module I²C interface is provided for board compatibility with I²C.