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Infineon Technologies IR3838MTR1PBF
- Part No.:
- IR3838MTR1PBF
- Manufacturer:
- Infineon Technologies
- Package:
- 17-VQFN
- Datasheet:
-
IR3838MTR1PBF.pdf
- Description:
- IC REG BUCK ADJ 10A 17PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
IR3838MTR1PBF from Infineon Technologies is a highly integrated 10A synchronous buck regulator with internal high- and low-side MOSFETs, programmable 250–1500 kHz switching frequency, 0.6–0.9×Vin output voltage range, and integrated LDO bias supply. It delivers accurate, efficient power for low-voltage point-of-load applications in telecom and data center systems.
For engineers reviewing the IR3838MTR1PBF datasheet, IR3838MTR1PBF pinout, IR3838MTR1PBF application, or IR3838MTR1PBF equivalent, key selection criteria include its 10A continuous load capability, hiccup-mode overcurrent protection, pre-bias startup, margining via Vref, and thermal shutdown with 140°C trip point.
Technical Context
The IR3838 implements a current-mode PWM controller with digital soft-start, external frequency programming via Rt resistor, and dual-loop feedback supporting both fixed-output and tracking/margining configurations. Its error amplifier accepts inputs from Fb (output divider), Vref (margin reference), and Vp (tracking input), enabling flexible regulation modes.
Protection architecture includes cycle-by-cycle hiccup-mode OCSET-based current limiting, overvoltage detection on FB, thermal shutdown with 20°C hysteresis, and UVLO on both Enable and Vcc/LDO_out pins. The bootstrap driver supports high-side gate drive with integrated diode and 4.5–7.5V Boot-to-SW differential rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 10A continuous - supports high-density PoL loads without external current sense or driver stages |
| Input Voltage Range | PVin: 1.5–16V - enables single-supply operation from 3.3V, 5V, or 12V rails |
| Output Voltage Range | 0.6V to 0.9×Vin - supports sub-1V core supplies and adaptive tracking down to 0.6V |
| Switching Frequency | 225–1650 kHz - adjustable via Rt resistor; allows optimization of size vs. efficiency vs. EMI |
| Efficiency | >96% typical at 12VIN/1.8VOUT/10A - minimizes thermal load in compact 5×6mm PQFN package |
| Thermal Shutdown | 140°C trip, 20°C hysteresis - ensures safe recovery after overload or airflow loss |
| Power Good Accuracy | ±15% window around Vref or Vp - provides reliable rail monitoring for system sequencing |
Pinout & Package
IR3838MTR1PBF uses a 17-pin Power QFN (PQFN) package measuring 5 mm × 6 mm × 0.9 mm, with exposed thermal pad (PGnd pin 11) and lead-free, RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Fb (Pin 1) | Inverting error amplifier input | Connects to output voltage divider; sets regulated output via feedback ratio |
| Vref (Pin 2) | External reference input | Enables output margining (±10%) by injecting 0.54–1.2V reference |
| Comp (Pin 3) | Error amplifier output | Drives external RC compensation network to stabilize control loop |
| Rt (Pin 5) | Frequency programming input | Resistor to GND sets switching frequency (225–1650 kHz) |
| OCset (Pin 6) | Current limit threshold input | Resistor between OCset and SW sets peak inductor current limit |
| PGood (Pin 7) | Open-drain status output | Asserts when output is within ±15% of target; tracks Vref or Vp |
| Sync (Pin 8) | External clock synchronization input | Accepts 20% higher-frequency external clock to align switching |
| Vin (Pin 9) | LDO input supply | Bias source for internal 5V LDO; float if external Vcc supplied |
| Vcc/LDO_out (Pin 10) | Internal LDO output | Provides 4.7–5.7V bias for control circuitry; can be bypassed |
| PGnd (Pin 11) | Power ground | Separate return path for MOSFET drivers; must connect to power plane |
| SW (Pin 12) | Switch node | Connects to inductor; carries high di/dt; requires tight layout |
| PVin (Pin 13) | Main power input | High-current input for power stage; decouple locally to PGnd |
| Boot (Pin 14) | Bootstrap supply | Charges high-side gate driver via 100nF capacitor to SW |
| Enable (Pin 15) | Startup control | UVLO thresholds (1.2V start / 0.85V stop) enable sequencing |
| Vp (Pin 16) | Tracking input | Allows output to follow external voltage rail during ramp-up/down |
| Gnd (Pins 4 & 17) | Signal ground | Reference for control logic and error amplifier; separate from PGnd |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs + Drivers | Eliminates external FETs and gate drivers; reduces BOM count and layout area |
| Digital Soft-Start | Programmable 10 ms delay with 200 kHz internal clock ensures controlled ramp-up |
| Pre-Bias Startup | Allows safe turn-on into pre-charged output capacitors without reverse current |
| Margining via Vref | Supports ±10% output adjustment using external DAC or resistor ladder |
| Thermal & Fault Protection | Combines hiccup OC, OV, UVLO, and 140°C thermal shutdown for robust field operation |
Applications
| Telecom Line Cards | Data Center ASIC Supplies |
|---|---|
Use Scenario: Powering FPGA, DSP, or packet processor cores on carrier-grade line cards requiring stable 1.2V/1.8V rails under dynamic load. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated low-voltage power with fast transient response. Use Value: Pre-bias startup prevents reverse current into charged backplane rails; hiccup OC protects against shorted daughterboard faults. | Use Scenario: Supplying GPU or AI accelerator cores in high-density server blades where space and thermal density are constrained. IC Role / Device Role / Timing Role: High-current point-of-load regulator operating at 600–1000 kHz to balance efficiency and EMI filtering size. Use Value: 96% efficiency at 10A reduces heat sink requirements; 5×6mm PQFN enables dense multi-rail layouts. |
| Network Switch ASIC Core Rails | Industrial Edge Compute Modules |
Use Scenario: Delivering 0.85V/10A to switch fabric ASICs with strict voltage tolerance and sequencing requirements. IC Role / Device Role / Timing Role: Margining-capable regulator supporting factory calibration and in-field voltage tuning via Vref pin. Use Value: ±10% margining range enables precise validation of ASIC timing margins across process/voltage/temperature corners. | Use Scenario: Providing isolated, sequenced 3.3V/5V rails for industrial IoT gateways operating in extended temperature environments. IC Role / Device Role / Timing Role: Robust PoL regulator with -40°C to +125°C junction rating and thermal hysteresis for uncooled enclosures. Use Value: 140°C thermal shutdown with 20°C hysteresis prevents thermal runaway while allowing safe recovery after transient overloads. |
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 | 6A rated, 0.8–15V input, fixed 2.2MHz switching, no Vref margining or tracking input | Suitable for lower-current, cost-sensitive DC/DC where margining and tracking are not required | Select when 6A output suffices and board space allows larger external components |
| TPS544B25RJER | 12A rated, PMBus interface, digital control, 4.5–18V input, supports telemetry and fault logging | Preferred for systems requiring real-time monitoring, dynamic voltage scaling, or firmware-based configuration | Choose when digital control, telemetry, or tighter output accuracy (<±0.5%) is mandatory |
Compared with MP2451DT-LF-Z and TPS544B25RJER, IR3838MTR1PBF offers unique analog margining and tracking capability in a 10A monolithic solution-ideal for analog-heavy telecom and industrial designs where digital overhead is undesirable.
Availability
IR3838MTR1PBF is available at Aetrix Electronics and suitable for telecom line cards, data center ASIC supplies, and industrial edge compute modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for IR3838MTR1PBF 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 leadership in high-efficiency power conversion solutions.
The SupIRBuck™ product line delivers fully integrated, high-current synchronous buck regulators targeting space-constrained, thermally demanding point-of-load applications in networking, computing, and industrial equipment.
FAQ
What is the minimum recommended output capacitance for stable operation at 10A?
Infineon specifies ≥220 µF total ceramic output capacitance with ≤1 mΩ ESR for 1.8V/10A operation at 600 kHz. This ensures <1% output ripple and adequate phase margin with the internal compensation network. Layout must minimize loop inductance between SW, PGnd, and output caps.
Can the IR3838MTR1PBF operate without an external bias supply?
Yes. The internal LDO accepts PVin (1.5–16V) directly on Vin pin to generate 5V bias for control circuitry. External Vcc is optional: if supplied (4.5–6.5V), Vin should be left floating to avoid conflict. LDO dropout is 150 mV at 50 mA, ensuring stable operation down to 4.85V input.
How does the OCset pin set current limit, and what resistor value yields 12A limit?
OCset connects to SW through a resistor; current limit scales linearly with resistance. At 500 kHz, 12A corresponds to ~12 kΩ (based on 24.4 µA typical OCSET current and 1.2V reference). Exact value depends on switching frequency and must be verified per Figure 13 in Rev 1.41 datasheet using the OCSET vs. ROCSET curve.
Is the IR3838MTR1PBF pin-compatible with other SupIRBuck devices?
Yes. It shares identical 17-pin 5×6mm PQFN footprint and pinout with IR3836 (6A) and IR3839 (14A), enabling scalable design reuse across current ratings. Key signals (Fb, Vref, Comp, Rt, OCset, PGood, Sync, Enable, Vp) retain identical functions and electrical behavior across the family.
IR3838MTR1PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 17-VQFN
- 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):
- 7V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 14.4V
- Current - Output:
- 10A
- 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 (5x6)
IR3838MTR1PBF FAQ
1.How can I place an order for IR3838MTR1PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3838MTR1PBF 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 IR3838MTR1PBF reliable?
The price and inventory of IR3838MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3838MTR1PBF is usually 5 days.
3.What payment methods are accepted for IR3838MTR1PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3838MTR1PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3838MTR1PBF?
IR3838MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3838MTR1PBF 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 IR3838MTR1PBF?
For technical support, including IR3838MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3838MTR1PBF requirements.
6.How does Aetrix verify that IR3838MTR1PBF is sourced from the original manufacturer or authorized distributors?
All IR3838MTR1PBF 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 IR3838MTR1PBF meets industry standards.
7.What is the process for return or replacement of IR3838MTR1PBF?
All IR3838MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3838MTR1PBF, 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 IR3838MTR1PBF part is unused and in its original packaging.
Return procedure for IR3838MTR1PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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