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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Infineon Technologies IR3802MTRPBF

Name: IR3802MTRPBF
Brand: Infineon Technologies
SKU: IR3802MTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3802MTRPBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3802MTRPBF.pdf

Description:: IC REG BUCK ADJ 4A PQFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,561

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Product details

Overview

IR3802MTRPBF from Infineon Technologies is a highly integrated synchronous buck regulator with integrated high- and low-side MOSFETs, delivering up to 4A continuous output current, 0.6V–12V adjustable output voltage, and fixed 600kHz switching frequency. It operates from 2.5V–21V input, features programmable over-current protection, pre-bias startup, and thermal shutdown - deployed in graphics cards and embedded point-of-load systems.

For engineers reviewing the IR3802MTRPBF datasheet, IR3802MTRPBF pinout, IR3802MTRPBF application, or IR3802MTRPBF equivalent, key selection criteria include its integrated power stage, AGnd/PGnd separation for noise immunity, hiccup-mode current limiting, soft-start programmability via external capacitor, and VC bootstrap supply requirement for high-side gate drive.

Technical Context

The IR3802MTRPBF implements voltage-mode PWM control with a fixed 600kHz oscillator and internal sawtooth ramp generator, eliminating external timing components. Its error amplifier compares FB voltage against a precision 0.6V reference, driving a trailing-edge modulator that controls integrated N-channel MOSFETs.

Current sensing uses R_DS(on) of the low-side FET (18–23 mΩ typ.), enabling resistorless over-current protection with programmable threshold via OCSet resistor. Under-voltage lockout independently monitors VCC (4.0–4.4V turn-on) and VC (3.1–3.5V turn-on), while thermal shutdown activates at 140°C with 20°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5V to 21V - supports wide industrial and computing input rails including 3.3V, 5V, 12V, and 19V adapters.
Output Voltage Range	0.6V to 12V - enables core voltage regulation for CPUs, GPUs, and FPGAs via resistor divider on FB pin.
Continuous Output Current	4A - sustained load capability verified under thermal constraints with 5mm×6mm QFN package.
Switching Frequency	600kHz (540–660kHz) - allows compact external inductors (e.g., 1.5µH) and reduces EMI filtering burden.
Reference Voltage Accuracy	±2.0% (–40°C to +105°C) - ensures stable output regulation across extended temperature ranges.
Thermal Shutdown Threshold	140°C with 20°C hysteresis - provides self-recovery protection without latching during transient overload.
Soft-Start Control	Capacitor-programmable via SS pin - sets controlled output ramp time and enables shutdown by pulling SS < 0.3V.

Pinout & Package

IR3802MTRPBF is housed in a thermally enhanced 15-pin Power QFN package measuring 5mm × 6mm, with exposed thermal pad for PCB-level heat dissipation. Signal (AGnd) and power (PGnd) grounds are physically separated to minimize noise coupling between control and switching paths.

Pin/Terminal	Circuit Role	Design Meaning
1, 9	NC	No-connect pins - must remain unconnected per design; no internal function or routing.
2	FB	Inverting input of error amplifier - connected to output via resistor divider to set regulated voltage (V_OUT = 0.6V × (1 + R1/R2)).
3	COMP	Error amplifier output - drives compensation network (type II/III) to stabilize loop response.
4, 5, 15	AGnd	Signal ground for reference, error amp, and control logic - must be tied together and routed separately from PGnd.
6	SS/SD	Soft-start/shutdown - capacitor-to-AGnd sets ramp time; pulled < 0.3V to force shutdown.
7	OCSet	Over-current threshold programming - resistor from OCSet to SW sets current limit based on low-side R_DS(on).
8	VCC	Bias supply for internal logic and low-side driver - requires ≥0.1µF ceramic cap to PGnd.
10	PGnd	Power ground for MOSFET drivers - connects to system power plane and inductor return path.
11	SW	Switch node - connects to inductor and OCSet resistor; carries high di/dt switching waveform.
12	VIN	Main input supply - accepts 2.5V–21V; feeds internal LDOs and high-side driver bootstrap circuitry.
13	HG	High-side gate driver output - connects to high-side MOSFET gate; requires small RC snubber to SW.
14	VC	Bootstrap supply for high-side driver - must be ≥VIN + 5V (up to 28V); requires ≥0.1µF ceramic cap to PGnd.

Key Features

Feature	Design Value
Integrated dual-MOSFET power stage	Eliminates external discrete switches; top/bottom R_DS(on) = 18–23 mΩ enables >90% efficiency at 4A/1.8V.
Pre-bias start-up capability	Allows safe startup into pre-charged output rails without output voltage disturbance or oscillation.
Hiccup-mode over-current protection	Enters timed restart cycle upon fault - limits average power dissipation and prevents thermal runaway.
Separated AGnd and PGnd terminals	Reduces noise coupling between analog feedback and high-current switching paths for improved regulation accuracy.
Programmable soft-start and shutdown	Single-pin (SS/SD) control enables precise power sequencing and system-level enable/disable coordination.

Applications

Graphics Card VRM

Embedded Point-of-Load

Use Scenario: Regulating GPU core voltage (e.g., 0.8–1.2V @ 3–4A) in discrete graphics cards with tight space constraints.

IC Role / Device Role / Timing Role: Primary synchronous buck controller and integrated power stage - replaces multi-chip solutions with single-package regulation.

Use Value: Reduces BOM count and PCB area; 600kHz operation enables use of 1.5µH inductors and minimizes output capacitance requirements.

Use Scenario: Providing stable 1.8V or 3.3V rail to FPGA I/O banks or microcontroller peripherals in industrial edge devices.

IC Role / Device Role / Timing Role: Standalone DC/DC converter with programmable startup and fault recovery - operates without external controllers.

Use Value: Pre-bias startup avoids bus contention during hot-swap; hiccup protection maintains system uptime during intermittent short circuits.

Desktop PC CPU Core Supply

Set-Top Box SoC Power

Use Scenario: Delivering dynamic 0.6–1.4V core voltage to desktop CPU voltage regulators with fast load-transient response.

IC Role / Device Role / Timing Role: High-efficiency, integrated buck regulator with precision 0.6V reference and ±2% FB accuracy across temperature.

Use Value: Tight reference tolerance ensures compliance with CPU VID specifications; thermal shutdown protects against heatsink failure.

Use Scenario: Generating 1.2V and 1.8V rails for media processor SoCs in consumer STB platforms requiring low standby power.

IC Role / Device Role / Timing Role: Primary POL regulator with shutdown control via SS pin - enables deep-sleep mode coordination with host MCU.

Use Value: Low quiescent current (ICC static = 10–13mA) and programmable soft-start reduce inrush during wake-up events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2315DJ-LF-Z	3A rated, 2.5–30V input, 500kHz switching, no VC bootstrap - uses internal charge pump for high-side drive.	Lacks separate VC supply and PGnd/AGnd isolation; less suitable for high-noise, high-accuracy POL designs.	Preferred where input voltage exceeds 21V or board space is extremely constrained; not drop-in due to different pinout and control architecture.
TPS54332DR	3A external-FET controller, 3.5–28V input, adjustable frequency (100kHz–2.5MHz), no integrated MOSFETs.	Requires external high/low-side FETs and gate drivers - higher BOM cost but greater thermal and efficiency flexibility.	Chosen when thermal management demands discrete FETs or when 4A+ continuous load requires paralleled stages.

Compared with MP2315DJ-LF-Z and TPS54332DR, the IR3802MTRPBF delivers higher integration (dual MOSFETs + drivers), tighter output voltage accuracy (±2%), and dedicated ground separation - making it optimal for space-constrained, noise-sensitive computing POLs where 4A continuous output is required.

Availability

IR3802MTRPBF is available at Aetrix Electronics and suitable for graphics card VRMs, embedded point-of-load systems, and desktop PC CPU core supplies requiring stable component supply, RoHS-compliant packaging, and full reel (750 pcs) ordering.

Supply support for IR3802MTRPBF 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 ICs, and industrial control solutions, with global manufacturing and quality certification to ISO/TS 16949 and ISO 14001.

The IR3802 belongs to Infineon's SupIRBuck™ family - designed specifically for high-density, high-efficiency DC/DC conversion in computing and consumer electronics where integration, thermal performance, and ease of layout are critical.

FAQ

What is the minimum output voltage supported by the IR3802MTRPBF?

The IR3802MTRPBF supports a minimum output voltage of 0.6V, set by its internal precision reference. This value is guaranteed across –40°C to +105°C with ±2.0% accuracy, enabling direct regulation of modern low-voltage processor cores and memory I/O rails without external reference trimming.

How is the over-current protection threshold configured?

The over-current threshold is set by an external resistor connected between OCSet and SW pins. The current limit scales inversely with this resistor value, using the low-side MOSFET's R_DS(on) (18–23 mΩ) as the current sense element - eliminating the need for a discrete sense resistor and associated power loss.

Can the IR3802MTRPBF operate without a VC supply?

No. The VC pin must be supplied with a voltage ≥ VIN + 5V (up to 28V) to power the high-side gate driver. This is typically achieved using a bootstrap capacitor charged through the HG-SW path during low-side conduction - omitting VC will disable high-side switching and prevent regulation.

Is the IR3802MTRPBF compatible with pre-charged output capacitors?

Yes. The IR3802MTRPBF includes dedicated pre-bias startup circuitry that disables the synchronous rectifier until the first control pulse is generated, preventing reverse current flow and output voltage collapse when powering into an already charged rail - essential for hot-swap and multi-rail sequencing applications.

IR3802MTRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SupIRBuck®

Package/Case:: 15-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):: 2.5V

Voltage - Input (Max):: 21V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 12V

Current - Output:: 4A

Frequency - Switching:: 600kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PQFN (5x6)

IR3802MTRPBF FAQ

1.How can I place an order for IR3802MTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3802MTRPBF 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 IR3802MTRPBF reliable?

The price and inventory of IR3802MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3802MTRPBF is usually 5 days.

3.What payment methods are accepted for IR3802MTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3802MTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3802MTRPBF?

IR3802MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3802MTRPBF 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 IR3802MTRPBF?

For technical support, including IR3802MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3802MTRPBF requirements.

6.How does Aetrix verify that IR3802MTRPBF is sourced from the original manufacturer or authorized distributors?

All IR3802MTRPBF 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 IR3802MTRPBF meets industry standards.

7.What is the process for return or replacement of IR3802MTRPBF?

All IR3802MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3802MTRPBF, 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 IR3802MTRPBF part is unused and in its original packaging.

Return procedure for IR3802MTRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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