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Infineon Technologies IR3899AMTRPBFAUMA1
- Part No.:
- IR3899AMTRPBFAUMA1
- Manufacturer:
- Infineon Technologies
- Package:
- 24-PowerVFQFN
- Datasheet:
-
IR3899AMTRPBFAUMA1.pdf
- Description:
- IC REG BUCK ADJ 9A IQFN-24-901
- Quantity:
- Payment:
- Shipping:
Inventory:8,364
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Product details
Overview
IR3899AMTRPBFAUMA1 from Infineon is a fully integrated 9 A synchronous buck regulator with integrated high- and low-side MOSFETs, Fast Constant On-Time (COT) control, 4.3–17 V input range, 0.6 V ±0.5% reference voltage, and 600 kHz–2 MHz programmable switching frequency. It delivers point-of-load power in server VRMs and telecom baseband cards.
For engineers reviewing the IR3899AMTRPBFAUMA1 datasheet, IR3899AMTRPBFAUMA1 pinout, IR3899AMTRPBFAUMA1 application, or IR3899AMTRPBFAUMA1 equivalent, this device supports monotonic start-up, pre-bias start-up, thermally compensated OCP, and dual-mode operation (FCCM/DEM) for efficiency optimization across load conditions.
Technical Context
The IR3899A implements a Fast COT control architecture with adaptive on-time generation, enabling stable regulation with ceramic output capacitors and no external compensation. Its internal LDO powers the controller from PVIN, eliminating need for auxiliary bias supply.
It integrates dual protection logic: VSNS-based overvoltage detection feeds both PGood assertion and OVP shutdown, while ILIM pin selects between two thermally compensated current-limit thresholds. Soft-start time is fixed at 2 ms with monotonic ramping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 9 A continuous; supports full-load operation without derating at Tj ≤ 100 °C with proper PCB thermal design. |
| Input Voltage Range | 4.3 V to 17 V; single-supply operation enables direct use with 5 V, 12 V, or intermediate bus rails. |
| Reference Voltage | 0.6 V ±0.5%; enables precise 0.6–3.3 V output programming via resistor divider on FB pin. |
| Switching Frequency | 600 kHz to 2 MHz; set by resistor on TON/MODE pin; higher frequencies allow smaller magnetics and faster transient response. |
| Control Scheme | Fast Constant On-Time (COT); provides <1 µs load-step response and eliminates loop compensation components. |
| Protection Features | Pre-bias start-up, thermally compensated OCP (2 settings), UVP/OVP, OTP, and monotonic soft-start ensure robust system-level fault handling. |
Pinout & Package
IR3899AMTRPBFAUMA1 uses a 4 mm × 5 mm PQFN package with exposed thermal pad (PGND-connected) and 17-pin layout optimized for high-current DC-DC conversion. Pin 1 is FB; pin 17 is SW; pins 4 and 17 are AGND; pin 11 is PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage feedback input | Connects to output via resistor divider to set regulated output voltage; referenced to AGND. |
| ILIM | OCP limit selection | Grounding or floating selects between two thermally compensated current-limit thresholds for overload protection. |
| TON/MODE | Frequency & mode control | Resistor-to-ground sets one of eight switching frequencies and selects FCCM or Diode Emulation Mode. |
| PGood | Open-drain status output | Asserts high-Z when output is within ±10% of target; requires external pull-up to VCC/LDO or system rail. |
| VSNS | OVP & PGood sense | Monitors output voltage independently of FB; used for fast OVP shutdown and accurate PGood assertion. |
| BOOT | High-side gate driver supply | Connected to SW through bootstrap capacitor; supplies gate drive voltage for integrated high-side MOSFET. |
| EN | Enable control input | Active-high logic input with internal voltage monitoring; asserts PGood only after valid enable and stable regulation. |
| SW | Power switch node | Drives external output inductor; connects internally to both MOSFETs; requires low-inductance layout to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | On-die high- and low-side MOSFETs + bootstrap diode eliminate external FETs and reduce BOM count by ≥4 components. |
| No External Compensation | Fast COT architecture stabilizes with ceramic output caps only-no Type-II/III compensation network required. |
| Programmable Light-Load Efficiency | FCCM forces continuous conduction for low-noise applications; DEM enables discontinuous mode to cut switching losses below ~15% load. |
| Robust Start-Up | 2 ms monotonic soft-start prevents output overshoot; pre-bias start-up safely charges already-biased outputs without reverse current. |
| Thermal Protection | OTP shuts down at Tj ≥ 150 °C; thermally compensated OCP adjusts trip threshold with junction temperature to maintain consistent current limit across operating range. |
Applications
| Server VRM | Telecom Baseband Card |
|---|---|
Use Scenario: Provides core 1.8 V or 1.2 V supply to multi-core Xeon or AMD EPYC processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering up to 9 A with fast transient response to CPU DVFS events. Use Value: Fast COT control achieves <10 µs recovery from 50% load step, minimizing voltage droop during burst workloads. | Use Scenario: Powers FPGA, DSP, and SerDes blocks on 5G baseband processing cards with strict ripple and noise requirements. IC Role / Device Role / Timing Role: Secondary POL regulator generating clean 1.0 V or 0.85 V rails with FCCM mode enabled to suppress switching noise near RF sections. Use Value: Monotonic start-up and pre-bias capability prevent latch-up when hot-plugging daughterboards into live backplanes. |
| Enterprise SSD Controller | Industrial PLC I/O Module |
Use Scenario: Supplies 3.3 V or 2.5 V to NVMe controller ASICs and NAND flash interface logic in high-density storage arrays. IC Role / Device Role / Timing Role: High-efficiency buck converter operating at 1.2 MHz to balance EMI filtering size and thermal performance in confined M.2 form factor. Use Value: Dual OCP settings allow conservative current limiting during firmware update (low temp) and aggressive limits during sustained write bursts (high temp). | Use Scenario: Delivers isolated 5 V or 3.3 V to microcontroller, ADC, and digital isolator rails in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Industrial-grade POL regulator qualified per JEDEC JESD22-A108 with -40 °C to +125 °C Tj operation. Use Value: Halogen-free, RoHS-compliant PQFN package meets IPC-J-STD-020 moisture sensitivity level 3 (MSL3) for standard SMT assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | 3 A output, 4.5–36 V input, external MOSFETs required; no integrated LDO or pre-bias start-up. | Suitable for lower-current industrial sensors but lacks monotonic start-up and thermally compensated OCP. | Select when cost-sensitive designs tolerate external FETs and simplified protection. |
| TPS549D22RQFR (TI) | 12 A output, 4.5–18 V input, D-CAP3 control, supports PMBus; larger 5 mm × 6 mm QFN package. | Better suited for digitally managed server VRMs requiring telemetry and dynamic voltage scaling. | Select when PMBus interface, higher current, or digital configuration are required. |
Compared with MP2451DT-LF-Z and TPS549D22RQFR, the IR3899AMTRPBFAUMA1 uniquely balances integration (integrated FETs + LDO), analog configurability (resistor-programmed frequency/OCP), and industrial qualification-making it optimal for space-constrained, analog-controlled POLs where reliability and ease-of-use outweigh digital control needs.
Availability
IR3899AMTRPBFAUMA1 is available at Aetrix Electronics and suitable for server VRMs, telecom baseband cards, enterprise SSD controllers, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and JEDEC-qualified reliability.
Supply support for IR3899AMTRPBFAUMA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.
The IR3899A belongs to Infineon's IPOL (Integrated POL) product line, designed specifically for compact, high-efficiency point-of-load regulation in datacenter, networking, and industrial edge equipment where board space and thermal density are critical constraints.
FAQ
What is the minimum recommended output capacitance for stable operation?
The IR3899A is stable with ceramic output capacitors as low as 22 µF total, provided ESR ≤ 5 mΩ and ESL ≤ 300 pH. Typical designs use three 10 µF/0805 X5R caps in parallel near the SW and PGND pins to meet transient response and ripple targets under 9 A load steps.
How does the ILIM pin select between OCP thresholds?
ILIM pin voltage determines OCP setting: grounding selects 12 A typical limit; leaving floating selects 15 A typical limit. The threshold scales linearly with junction temperature-e.g., at 100 °C, the 12 A setting drops to ~10.8 A to maintain consistent SOA across temperature.
Can the IR3899A operate without an external bootstrap capacitor?
No. The BOOT pin requires a minimum 0.1 µF ceramic capacitor connected between BOOT and SW to charge the high-side gate driver. Omitting it causes immediate high-side FET failure due to insufficient gate voltage, as the internal bootstrap diode cannot sustain gate drive without external energy storage.
Is the PGood signal asserted before or after soft-start completion?
PGood is asserted only after soft-start completes and output voltage remains within ±10% of the programmed value for ≥100 µs. It is not asserted during monotonic ramp-up-even if voltage crosses threshold early-ensuring reliable power sequencing in multi-rail systems.
IR3899AMTRPBFAUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 24-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 9A
- Frequency - Switching:
- 600kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-IQFN-24-901
IR3899AMTRPBFAUMA1 FAQ
1.How can I place an order for IR3899AMTRPBFAUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3899AMTRPBFAUMA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for IR3899AMTRPBFAUMA1 reliable?
The price and inventory of IR3899AMTRPBFAUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3899AMTRPBFAUMA1 is usually 5 days.
3.What payment methods are accepted for IR3899AMTRPBFAUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3899AMTRPBFAUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3899AMTRPBFAUMA1?
IR3899AMTRPBFAUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3899AMTRPBFAUMA1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for IR3899AMTRPBFAUMA1?
For technical support, including IR3899AMTRPBFAUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3899AMTRPBFAUMA1 requirements.
6.How does Aetrix verify that IR3899AMTRPBFAUMA1 is sourced from the original manufacturer or authorized distributors?
All IR3899AMTRPBFAUMA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IR3899AMTRPBFAUMA1 meets industry standards.
7.What is the process for return or replacement of IR3899AMTRPBFAUMA1?
All IR3899AMTRPBFAUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with IR3899AMTRPBFAUMA1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The IR3899AMTRPBFAUMA1 part is unused and in its original packaging.
Return procedure for IR3899AMTRPBFAUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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