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Infineon Technologies IR3853MTR1PBF
- Part No.:
- IR3853MTR1PBF
- Manufacturer:
- Infineon Technologies
- Package:
- 17-PowerVQFN
- Datasheet:
-
IR3853MTR1PBF.pdf
- Description:
- IC REG BUCK ADJ 4A 17PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,320
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Product details
Overview
IR3853MTR1PBF from Infineon Technologies is a fully integrated 4A synchronous buck regulator with co-packaged high- and low-side MOSFETs, PWM controller, and bootstrap diode in a 4mm × 5mm Power QFN package. It delivers 0.7V–0.9×Vin output over 1.5V–21V input, achieves >95% peak efficiency at 1.8V/4A, and supports programmable switching frequency up to 1.5MHz for point-of-load power delivery in server VRMs.
For engineers reviewing the IR3853MTR1PBF datasheet, IR3853MTR1PBF pinout, IR3853MTR1PBF application, or IR3853MTR1PBF equivalent, key selection criteria include its precision 0.7V ±1% reference, hiccup-mode overcurrent protection, pre-bias start-up capability, dedicated voltage monitoring input (Vsns), and thermal shutdown at 140°C junction temperature.
Technical Context
The IR3853 employs a current-mode PWM architecture with a high-bandwidth error amplifier (GBWP = 20–40 MHz, slew rate = 7–20 V/μs) and internal ramp compensation. Its oscillator supports external resistor (Rt) programming across 225–1650 kHz and synchronization via the Sync pin for multi-rail timing alignment.
Protection logic includes overvoltage detection on Vsns (trip at 110–120% Vref), PGood assertion at 80–90% Vref with 256/Fs delay, and thermal shutdown with 20°C hysteresis. The OCSet pin sets current limit threshold using an external resistor to SW, enabling adjustable hiccup-cycle fault response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Continuous 4A load capability enables single-chip supply for mid-power FPGA I/O or ASIC core rails. |
| Input Voltage Range | 1.5V to 21V supports wide-input industrial and telecom intermediate bus architectures. |
| Output Voltage Range | 0.7V to 0.9×Vin allows adaptive regulation for dynamic voltage scaling in processors. |
| Reference Voltage | 0.7V ±1% (0°C–125°C) ensures tight output accuracy without external trimming. |
| Switching Frequency | Programmable 225–1650 kHz permits optimization of size vs. efficiency trade-offs in space-constrained designs. |
| Junction Temp Range | –40°C to +125°C operation suits embedded telecom and storage applications with elevated ambient conditions. |
| Package | 4mm × 5mm Power QFN with exposed thermal pad provides low-θJA (45°C/W) for passive cooling. |
Pinout & Package
IR3853MTR1PBF uses a 17-pin Power QFN package with exposed thermal pad (4mm × 5mm). Pin 11 (PGnd) and Pin 17 (Gnd) are separated for optimal power/ground isolation; Pin 14 (Boot) requires a 0.1µF capacitor to SW; Pin 10 (Vcc) mandates ≥1µF high-frequency decoupling to PGnd.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 Fb | Inverting input of error amplifier | Connects to output voltage divider to set regulated Vout; defines feedback loop stability point. |
| 2 Vsns | Voltage sense input for PGood and OVP | Monitors output rail independently for accurate power-good assertion and overvoltage fault detection. |
| 3 Comp | Error amplifier output | Interface for external RC compensation network to tune loop bandwidth and phase margin. |
| 4,17 Gnd | Signal ground reference | Provides low-noise return path for internal bias and control circuitry; must be isolated from PGnd. |
| 5 Rt | Oscillator frequency set | Resistor-to-Gnd sets switching frequency; 9.31kΩ yields ~1.5MHz, 59kΩ yields ~250kHz. |
| 6 SS/SD | Soft-start / shutdown control | Capacitor-to-Gnd programs startup time; <0.3V forces immediate shutdown. |
| 7 OCSet | Current limit threshold | Resistor from OCSet to SW sets hiccup-mode current trip level per design requirements. |
| 8 PGood | Open-drain power-good indicator | Asserts after Vout reaches 80–90% Vref with programmable delay; requires external pull-up to Vcc. |
| 9 Sync | External clock synchronization input | Enables phase-aligned operation with other POL regulators to reduce input ripple current. |
| 10 Vcc | Internal IC and driver supply | Must be decoupled with ≥1µF ceramic cap to PGnd; UVLO thresholds: 3.95V start / 3.65V stop. |
| 11 PGnd | Power ground for MOSFET drivers | Dedicated return for high-current switching paths; connects directly to PCB power plane. |
| 12 SW | Switch node | Connects to inductor; carries high dv/dt switching waveform; critical for layout EMI control. |
| 13 VIN | Main input voltage supply | Accepts 1.5–21V; requires local bulk and high-frequency input capacitors. |
| 14 Boot | High-side gate driver supply | 0.1µF bootstrap capacitor to SW generates floating voltage for top-FET drive. |
| 15 Enable | Input enable with UVLO | Turn-on threshold: 1.14–1.36V rising; turn-off: 0.9–1.06V falling; leakage <15µA. |
| 16 Seq | Power sequencing control | Two-resistor divider enables simultaneous or staggered startup with other rails in multi-voltage systems. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Eliminates external diode, reduces BOM count and layout area in compact POL designs. |
| Enhanced pre-bias start-up | Allows safe startup into pre-charged output capacitors without reverse current or latch-up. |
| Programmable soft-start | Adjustable ramp time prevents inrush current and overshoot during power-up sequences. |
| Dedicated Vsns input | Enables independent voltage monitoring for PGood and OVP, improving system reliability vs. shared feedback. |
| Hiccup-mode overcurrent protection | Auto-retry fault response limits power dissipation during sustained overload or short-circuit events. |
Applications
| Server CPU Core Supply | Network Processor I/O Rail |
|---|---|
Use Scenario: Regulating 0.85V–1.1V core voltage for dual-socket x86 servers with dynamic load steps up to 4A. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering precise, low-noise power with fast transient response. Use Value: High bandwidth error amplifier and programmable frequency enable sub-100ns load-step recovery at 4A/µs. | Use Scenario: Powering 1.2V/1.5V I/O banks of multi-core network processors in 10G/25G line cards. IC Role / Device Role / Timing Role: Synchronous buck converter with sequencing (Seq pin) for controlled power-up of multiple voltage domains. Use Value: Independent Vsns monitoring and PGood output ensure deterministic power sequencing and system-level fault reporting. |
| Enterprise SSD Controller Rail | Industrial FPGA Configuration Supply |
Use Scenario: Generating stable 1.8V supply for NVMe SSD controllers under bursty 0–4A loads with minimal thermal rise. IC Role / Device Role / Timing Role: Efficient DC-DC regulator with thermal shutdown and hiccup protection for unattended operation. Use Value: 45°C/W θJA and 140°C thermal shutdown prevent thermal runaway in sealed storage enclosures. | Use Scenario: Providing 3.3V configuration voltage for Xilinx Artix-7 FPGAs in ruggedized industrial PLC modules. IC Role / Device Role / Timing Role: Robust buck regulator supporting –40°C to +125°C junction operation and pre-bias start-up. Use Value: Guaranteed operation across full industrial temperature range with no derating below 4A output current. |
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 | 3A rated, fixed 2MHz switching frequency, no Sync or Seq pins, smaller 3mm × 3mm QFN | Lacks multi-rail synchronization and sequencing; suited for cost-sensitive, lower-current consumer applications | Select when board space is critical and 3A output suffices; avoid for server or telecom where 4A and sequencing are required. |
| TPS54332DR | 3.5A rated, external MOSFETs required, adjustable frequency 200kHz–2.5MHz, no integrated bootstrap diode | Higher design complexity due to discrete FETs and gate drive components; better thermal scalability | Choose when thermal headroom exceeds 4A or when discrete FET selection is needed for specific Rds(on)/Qg trade-offs. |
Compared with MP2451DT-LF-Z and TPS54332DR, IR3853MTR1PBF uniquely integrates 4A MOSFETs, bootstrap diode, and sequencing/Sync functionality in a thermally optimized 4mm × 5mm package-making it optimal for high-density, multi-rail, industrial-grade POL systems requiring guaranteed 4A performance and robust fault handling.
Availability
IR3853MTR1PBF is available at Aetrix Electronics and suitable for server applications, enterprise storage systems, and embedded telecom systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for IR3853MTR1PBF 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 leader specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.
The SupIRBuck™ product line delivers highly integrated, high-efficiency DC-DC regulators targeting distributed point-of-load power architectures in datacenter, networking, and industrial computing equipment.
FAQ
What is the minimum recommended output capacitance for stable operation at 4A?
Infineon specifies ≥220µF total output capacitance with ≤10mΩ ESR for 1.8V/4A operation at 600kHz. This ensures <1% output voltage deviation during 4A load transients and meets PGood assertion timing requirements per the datasheet's Vsns monitoring window.
Can IR3853MTR1PBF operate with a 3.3V input supply?
Yes - the device supports input voltages from 1.5V to 21V. At 3.3V input, maximum output is 2.97V (0.9×Vin), and efficiency remains >92% at 1.2V/4A per typical curves. Ensure Vcc is supplied externally or derived from VIN via internal LDO if Vcc <4.5V.
How is the overcurrent protection threshold set and verified?
The OCSet pin connects via resistor to SW to define current limit. For example, a 10kΩ resistor yields ~150µA IOCSET, corresponding to ~25A sensed current (calculated using RDS(on) and gain). Threshold is verified by measuring SW node current during overload and confirming hiccup-mode activation within 4096 cycles.
Does IR3853MTR1PBF require external compensation components?
Yes - an external RC network between Comp (Pin 3) and Fb (Pin 1) is mandatory for loop stability. Typical values are 10kΩ in series with 1nF, but exact values depend on output voltage, inductance, and desired phase margin; Infineon provides design calculators and SPICE models for validation.
IR3853MTR1PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 17-PowerVQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.7V
- Voltage - Output (Max):
- 18.9V
- Current - Output:
- 4A
- Frequency - Switching:
- 225kHz ~ 1.65MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 17-PQFN (4x5)
IR3853MTR1PBF FAQ
1.How can I place an order for IR3853MTR1PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3853MTR1PBF 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 IR3853MTR1PBF reliable?
The price and inventory of IR3853MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3853MTR1PBF is usually 5 days.
3.What payment methods are accepted for IR3853MTR1PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3853MTR1PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3853MTR1PBF?
IR3853MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3853MTR1PBF 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 IR3853MTR1PBF?
For technical support, including IR3853MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3853MTR1PBF requirements.
6.How does Aetrix verify that IR3853MTR1PBF is sourced from the original manufacturer or authorized distributors?
All IR3853MTR1PBF 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 IR3853MTR1PBF meets industry standards.
7.What is the process for return or replacement of IR3853MTR1PBF?
All IR3853MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3853MTR1PBF, 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 IR3853MTR1PBF part is unused and in its original packaging.
Return procedure for IR3853MTR1PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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