IR3889MTRPBF - 30A Sync Buck Regulator | Infineon | POL
MPN： IR3889MTRPBF ✓ 啟用中IR3889MTRPBF 概覽
A synchronous buck converter is a DC-DC step-down regulator that uses a high-side and low-side MOSFET instead of a diode to reduce conduction losses, making it the preferred topology for high-current point-of-load conversion. The IR3889 belongs to the power management IC hierarchy: IPOL -> integrated power stage -> DC-DC converter -> voltage regulator. It integrates the PWM controller, OptiMOS power MOSFETs, and bootstrap diode, minimizing external component count.
Key features include a fast Constant-On-Time (COT) control engine that eliminates complex loop compensation and achieves rapid transient response, stability with ceramic output capacitors, and a precision 0.8V +/-0.5% reference. The output voltage is adjustable from 0.5V to 0.875 x VIN.
Technically, the enhanced COT scheme simplifies design while providing fast control response to load steps typical of FPGA and processor cores. The integrated OptiMOS FETs deliver high efficiency at 30A, and the QFN exposed pad provides low thermal resistance for heat extraction into the PCB copper pour.
Typical applications include 30A POL rails for networking switches, servers, storage systems, and telecom infrastructure powering FPGAs, ASICs, and DSPs. Pricing starts at approximately $1.82 (as of 2026-08-29, LCSC).
Design tip: solder the exposed pad to a large copper area; at 30A loads, thermal management and minimum output capacitance per the datasheet are critical for stability.
直接替換替代品，適用於 IR3889MTRPBF — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
IR3889MTRPBFAUMA1
✅ 直接替換📋 參考替代品（不在目錄中）
IR3890MTRPBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
IR3891MTRPBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
IR3878MTRPBF
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
IR3889MTRPBF 最大額定值與電氣特性
| 拓撲 | Synchronous Buck (IPOL) |
| 最大輸出電流 | 30 A continuous |
| Input Voltage Range (single supply) | 4.3 V to 17 V |
| Input Voltage Range (external VCC) | 2.0 V to 17 V |
| 參考電壓 | 0.8 V +/- 0.5% |
| 輸出電壓範圍 | 0.5 V to 0.875 x VIN (adjustable) |
| Control Scheme | Enhanced Constant-On-Time (COT) |
| Integrated MOSFETs | OptiMOS high-side and low-side |
| Bootstrap Diode | Integrated |
| Ceramic Output Capacitor Stability | Yes |
| 封裝 | PG-IQFN-31, 5 x 6 mm, pitch 0.5 mm |
| 安裝類型 | Surface Mount |
| Protection Features | Overcurrent, overvoltage, overtemperature |
| Product Family | OptiMOS IPOL / POWIRstage |
| RoHS 狀態 | Compliant (Pb-free suffix PBF) |
IR3889MTRPBF pg-iqfn-31, 5 x 6 mm, pitch 0.5 mm 腳位配置指南
IR3889MTRPBF（pg-iqfn-31, 5 x 6 mm, pitch 0.5 mm 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： IR3889MTRPBF.
請參閱 資料表 以查看完整腳位配置。
典型應用
IR3889MTRPBF 適用於 6 應用s: FPGA Core Power Supply, Server and Data Center POL, Networking and Telecom Equipment, Storage Systems, Industrial Automation Control, Automotive Domain Controllers.
FPGA Core Power Supply
The IR3889MTRPBF powers FPGA core rails (typically 0.85V to 1.0V at 20-30A) where its 30A continuous rating and 0.8V +/-0.5% reference meet tight core-voltage accuracy windows. The enhanced fast COT engine reacts to millisecond-scale load steps during fabric switching without external compensation, and ceramic-only output capacitance keeps the solution compact near the FPGA BGA footprint.
推薦
Server and Data Center POL
In server motherboards, the IR3889MTRPBF converts 12V intermediate bus voltages down to point-of-load rails for ASICs, memory controllers, and SoCs. Its 4.3V-17V single-supply input accepts 12V rails directly, integrated OptiMOS FETs maximize conversion efficiency at 30A to reduce heat in dense racks, and the 5x6mm IQFN conserves board area on multi-rail power trees.
推薦
Networking and Telecom Equipment
Switch, router, and baseband line cards draw high continuous current on DSP and PHY rails. The IR3889MTRPBF's COT control provides fast transient response to bursty network traffic loads, overcurrent/overvoltage/overtemperature protection safeguards 24/7 operation, and the 2.0V-17V input range with external VCC accommodates varied telecom intermediate bus architectures.
推薦
Storage Systems
Enterprise SSD and HDD controller rails demand reliable high-current POL conversion with minimal board space. The IR3889MTRPBF's integrated bootstrap diode and MOSFETs reduce external parts, ceramic-capacitor stability improves long-term reliability versus electrolytic solutions, and its protection suite (OCP, OVP, OTP) protects storage silicon during fault events such as hot-plug transients.
推薦
Industrial Automation Control
PLC I/O modules and motor-control boards use the IR3889MTRPBF to derive 1-3.3V logic rails from 12V or 24V-derated industrial buses. Its wide input tolerance absorbs bus sag and surge, the PG-IQFN-31 exposed pad withstands vibration-reliable reflow onto heavy copper, and the -40C industrial ambient capability of the family supports unconditioned factory floor environments.
推薦
Automotive Domain Controllers
Using the AEC-grade IR3889MTRPBFAUMA1 variant, automotive ECU and domain-controller boards power ADAS SoCs and radar processors. The shared die and PG-IQFN-31 footprint with the standard IR3889MTRPBF lets one PCB layout serve both automotive and industrial product lines, while the enhanced COT response handles sharp SoC load transitions during sensor fusion bursts.
推薦
推薦產品摘要
工程參考資料，適用於 IR3889MTRPBF — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | IR3889MTRPBFAUMA1 | IR3890MTRPBF | IR3891MTRPBF |
|---|---|---|---|---|
| Package | PG-IQFN-31 (5x6mm) | PG-IQFN-31 (5x6mm) - same | PG-IQFN-31 (5x6mm) - same | PG-IQFN-31 (5x6mm) - same |
| Brand | Infineon | Infineon | Infineon | Infineon |
| Output Current | 30 A | 30 A | 15 A | 10 A |
| Reference Voltage | 0.8 V +/- 0.5% | 0.8 V +/- 0.5% | 0.8 V +/- 0.5% | 0.8 V +/- 0.5% |
| Control Scheme | Enhanced fast COT | Enhanced fast COT | Enhanced fast COT | Enhanced fast COT |
| Quality Flow | Industrial/consumer | Automotive (AUMA1) | Industrial/consumer | Industrial/consumer |
主要差異化特點
- Highest current in same IQFN-31 footprint (對比IR3890MTRPBF)
- Automotive drop-in option (對比IR3889MTRPBFAUMA1)
- Ceramic-capacitor stability with COT (對比IR3891MTRPBF)
設計說明
At 30A output, conduction losses in the integrated OptiMOS FETs are the dominant heat source. Solder the PG-IQFN-31 exposed pad to a minimum of 2 oz copper with an array of thermal vias to internal planes. Derate output current per the datasheet thermal curves at elevated ambient; verify junction temperature at worst-case load and 70C ambient.
Keep the input capacitor loop (VIN to PGND) as small as possible - high di/dt in this loop drives EMI and voltage spikes. Place the output inductor and ceramic output capacitors close to the LX and VOUT pins. Follow Infineon's IR3889 evaluation board layout (per datasheet v02_06) as a reference for star-grounding PGND and SGND.
The enhanced COT engine requires a minimum effective output capacitance for stability - do not reduce ceramic caps below the datasheet minimum to save BOM cost. When using the 2.0V-17V input mode, apply external VCC before or with VIN per the datasheet power-up sequence to avoid undefined startup states.
合規資訊
PBF (Pb-free) suffix indicates lead-free, RoHS-compliant construction per Infineon part nomenclature. Automotive applications should use IR3889MTRPBFAUMA1.
