特性
- Qualified for Renesas Rad Tolerant Screening and QCI Flow (R34TB0004EU)
- Wide operating voltage range:
- Input: 4.5V to 19V
- Output: VREF to PVIN×((TSW-107ns)/TSW)
- Output switching frequency range: 250kHz to 1.5MHz
- Optional droop regulation
- Current-mode control provides
- Excellent power supply rejection
- Simplified control scheme
- Differential output remote sensing
- Programmable VREF (0.2V to 1.2V) and soft start (0.5ms to 64ms)
- Hardware enable and software enable control
- Programmable UV, OV, OC fault levels
- Telemetry and fault reporting through PMBus
- TID Radiation Lot Acceptance Testing (RLAT) (LDR: ≤ 10mrad(Si)/s)
- ISL73849M30NEZ: 30krad(Si)
- ISL73849M50NEZ: 50krad(Si)
- SEE characterization
- No DSEE for, VDD = 25V, VCC = 6.7V, VISEN = 13.5V, and 46MeV•cm²/mg
- SEFI < 12.5µm² at 46MeV•cm²/mg
- SET < 3.91% on VOUT at 46MeV•cm²/mg
描述
The ISL73849M is a PMBus-based synchronous buck controller that can operate as a single- or dual-phase controller. It is intended to work with the ISL71441M (half-bridge GaN FET driver) to generate point-of-load (POL) voltage rails for commercial space applications.
It accepts an input voltage range of 4.5V to 19V with a programmable output switching frequency between 250kHz and 1.5MHz with a single resistor. The output can regulate a voltage up to 200mV and is limited on the top end by the minimum off time and selected switching frequency.
The ISL73849M features built-in current sharing, enabling two-phase operation within a single device and four-phase operation using two ISL73849s, all without requiring an external clock at ≤ 1.04MHz. For multiphase operation at other frequencies, the ISL74420 provides additional scalability, making it a flexible solution for multiphase power architectures.
The wide input voltage range makes it a suitable power supply option for a high-current FPGA core and other general-purpose power solutions. The ISL73849M uses current-mode modulation, which simplifies loop compensation and provides excellent power supply rejection. Additionally, the output is remotely sensed to compensate for any voltage drop in the load conditions. All of this put together results in a robust power supply solution that requires minimal components while achieving high current density.
The ISL73849M also features a tri-level output that provides excellent protection against faults by driving a mid-scale voltage to signal the power stage to enter a Hi-Z condition. Control, telemetry, and fault reporting through PMBus make the ISL73849M easy to program using an MCU.
The ISL73849M operates across the military temperature range from -55°C to +125°C and is available in a 80 Ld TQFP-EP package.
产品参数
| 属性 | 值 |
|---|---|
| Rating | Space |
| Control Mode | Peak Current Mode |
| Phases (Max) | 2 |
| No-Load Operating Current | 22mA |
| Quiescent Current | 11µA |
| Supply Voltage (min) (V) | 4.5 - 4.5 |
| Supply Voltage (max) (V) | 19 - 19 |
| Switching Frequency (min) (kHz) | 250 |
| Switching Frequency (max) (kHz) | 1500 |
| Topology | Sync. Buck |
| VREF (V) | 0.2 - 1.2 |
| Temp. Range (°C) | -55 to +125°C |
| TID LDR (krad(Si)) | 30, 50 |
| DSEE (MeV·cm2/mg) | 46 |
| Flow | RT Plastic |
| Qualification Level | Radiation Tolerant Plastic |
| Die Sale Availability? | No |
| PROTO Availability? | No |
封装选项
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TQFP-EP | 12.0 x 12.0 x 1.00 | 80 | 0.5 |
产品对比
 | | |
| ISL73849M | ISL73847M | |
| Supply Voltage (min) | 4.5 - 4.5 | 4.5 - 4.5 |
| Supply Voltage (max) | 19 - 19 | 19 - 19 |
| Switching Frequency (min) (kHz) | 250 | 250 |
| Switching Frequency (max) (kHz) | 1500 | 1500 |
| Quiescent Current | 11µA | 11µA |
| No-Load Operating Current | 22mA | 12mA |
| VREF (V) | 0.2 - 1.2 | 0.6 |
应用
- FPGA/ASIC core power supply