MIC24045 Synchronous Step Down Regulator
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MIC24045 Synchronous Step-Down Regulator With I²C
The MIC24045 is an Inter-Integrated Circuit (I²C)-programmable, high-efficiency, wide input range, 5A 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 a 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.
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MIC24045 Synchronous Step-Down Regulator Application
- Servers, Data Storage, Routers and Base Stations
- Field Programmable Gate Arrays (FPGAs), Digital Signal Processor (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 4.5V to 19V and output voltage from 0.64V to 5.25V in 5 mV, 10 mV, 30 mV and 50 mV steps at 5A. 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.
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