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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Infineon Technologies IRU3146CFTR

Name: IRU3146CFTR
Brand: Infineon Technologies
SKU: IRU3146CFTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRU3146CFTR

Manufacturer:: Infineon Technologies

Category:: DC DC Switching Controllers

Package:: 28-TSSOP (0.173", 4.40mm Width)

Datasheet:: IRU3146CFTR.pdf

Description:: IC REG CTRLR BUCK 28TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRU3146CFTR from International Rectifier is a dual synchronous buck PWM controller supporting both independent dual-output and 2-phase single-output configurations, with 180° out-of-phase operation, programmable switching frequency up to 500 kHz per phase, 0.8 V precision reference voltage, and MOSFET R_DS(ON)-based current sensing. It targets high-current point-of-load (POL) power supplies in DDR memory and graphics card applications.

For engineers reviewing the IRU3146CFTR datasheet, IRU3146CFTR pinout, IRU3146CFTR application, or IRU3146CFTR equivalent, key selection criteria include dual-mode configurability (2-phase vs. independent), hiccup/latched overcurrent protection, V_CC/V_CH UVLO thresholds, soft-start sequencing capability, and compatibility with DCR or R_DS(ON) current sensing topologies.

Technical Context

The IRU3146CFTR integrates two fully independent PWM control loops with shared oscillator architecture enabling precise 180° phase alignment in 2-phase mode. Each channel features dedicated error amplifiers (Comp1/Comp2), feedback inputs (Fb1/Fb2), soft-start/shutdown pins (SS1/SD, SS2/SD), and current limit set inputs (OCSet1/OCSet2).

It supports lossless inductor DCR current sensing via external RC networks for current sharing, while also allowing discrete R_DS(ON) sensing on low-side MOSFETs. The internal 6.2 V LDO (VOUT3) powers gate drivers, and thermal shutdown activates at 140 °C with 20 °C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	0.8 V ±1.5% - sets output voltage accuracy in voltage-mode regulation
Switching Frequency	Up to 500 kHz per phase - enables compact magnetics and low output ripple
UVLO Threshold (V_CC)	4.2 V with 0.25 V hysteresis - ensures reliable startup above minimum bias supply
Current Limit Method	R_DS(ON) sensing on low-side FET - eliminates sense resistor cost and power loss
Soft-Start Current	25 µA (SS1/SS2) - charges external capacitor to control ramp rate and inrush current
OVP Trip Threshold	1.15 × V_REF = 0.92 V - latches off outputs during overvoltage fault
Thermal Shutdown	140 °C trip, 20 °C hysteresis - protects IC under sustained overload or poor heatsinking

Pinout & Package

IRU3146CFTR is housed in a 28-pin TSSOP (F) package with exposed thermal pad, optimized for surface-mount assembly and thermal dissipation in high-density POL designs.

Pin/Terminal	Circuit Role	Design Meaning
1 (PGood)	Power Good open-drain output	Asserts low when either output drops >10% below setpoint - enables system sequencing and fault reporting
2 (V_CC)	Main IC supply input	4.5–16 V range powers internal logic, LDO, and bias circuits - UVLO disables all drivers below 4.2 V
3 (VOUT3)	Internal LDO output	6.2 V @ 50 mA - supplies gate drivers; short-circuit protected and usable for external charge pumps
4 (Rt)	Oscillator timing resistor	Connects to GND to set switching frequency (up to 500 kHz); value determines ramp slope and duty cycle stability
5,23 (VSEN2/VSEN1)	OVP and PGood sense inputs	Monitor output voltage for overvoltage protection and PGood assertion - tied together in 2-phase mode
6,22 (Fb2/Fb1)	Error amplifier inverting inputs	Compare feedback voltage against 0.8 V reference - determine output regulation point per channel
7,21 (Comp2/Comp1)	Error amplifier compensation nodes	Accept RC networks to stabilize loop response - critical for phase margin in high-bandwidth POL designs
8,20 (SS2/SD, SS1/SD)	Soft-start / shutdown control	Pull below 0.3 V to disable channel; internal 25 µA current charges external cap for controlled ramp-up
9,19 (OCSet2/OCSet1)	Current limit threshold inputs	Set overcurrent trip point using external resistor - supports R_DS(ON) or DCR sensing topologies
10,18 (V_cH2/V_cH1)	High-side driver supplies	Require ≥6 V above respective bus - decoupled with 1 µF ceramic to support peak gate drive current
11,17 (HDrv2/HDrv1)	High-side MOSFET gate drivers	Drive N-channel upper FETs with dead-time control - prevent shoot-through in synchronous buck stage
12,16 (PGnd2/PGnd1)	Power ground returns	Separate grounds for driver circuits - must connect to low-impedance PGND plane to minimize noise coupling
13,15 (LDrv2/LDrv1)	Low-side MOSFET gate drivers	Drive N-channel lower FETs with matched timing - enable synchronous rectification and high efficiency
14 (V_CL)	Low-side driver supply	Must be high for normal operation - enables LDrv outputs and internal logic functions
24 (Sync)	External clock synchronization input	Accepts TTL/CMOS clock to align switching edges - reduces EMI in multi-rail systems
25 (Hiccup)	Hiccup/latch-overcurrent mode select	Pull high for auto-restart on overcurrent; pull low for latched shutdown - configurable fault recovery behavior
26 (VP2)	Non-inverting input for EA2	In current-sharing mode, connects to programming resistor; in independent mode, tied to VREF
27 (VREF)	0.8 V reference output	2 µA drive strength - used as precision reference for feedback dividers and external circuitry
28 (Gnd)	Analog ground reference	Connect to PGnd plane with short trace - isolates sensitive analog circuitry from noisy power return paths

Key Features

Feature	Design Value
Dual-mode topology support	Configurable as two independent 1.8 V/30 A rails or one 1.8 V/60 A 2-phase rail - maximizes design reuse across platforms
180° out-of-phase operation	Reduces input/output capacitor RMS current by ~30% - lowers component count and board area in high-current POL
DCR and R_DS(ON) current sensing	Eliminates discrete current-sense resistors - improves efficiency and thermal performance in space-constrained layouts
Programmable hiccup/latch OCP	Selectable fault recovery via Hiccup pin - balances system reliability (latch) vs. availability (hiccup) per application requirement
Independent soft-start sequencing	Separate SS1/SS2 pins allow staggered ramp-up of dual outputs - prevents inrush current stacking in multi-rail systems

Applications

DDR Memory Power Supply

Graphics Card Core Voltage Rail

Use Scenario: Delivering tightly regulated 1.2–1.8 V at up to 60 A to DDR4/DDR5 memory modules with fast transient response.

IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller providing interleaved regulation and current sharing between parallel phases.

Use Value: 180° phase shift cuts input ripple current by 50%, reducing bulk capacitance requirements and improving dynamic load step response.

Use Scenario: Generating stable GPU core voltage (e.g., 0.8–1.2 V @ 40+ A) in discrete graphics cards with strict voltage tolerance and thermal constraints.

IC Role / Device Role / Timing Role: Dual-channel controller operating in independent mode to manage GPU core and memory I/O rails separately.

Use Value: Independent soft-start (SS1/SS2) enables safe power-up sequencing between GPU core and auxiliary rails, preventing latch-up or brownout.

Telecom Point-of-Load Converter

Embedded Computer System PSU

Use Scenario: High-efficiency 12 V-to-1.0 V conversion for ASIC/FPGA cores in telecom line cards requiring <±1% output regulation.

IC Role / Device Role / Timing Role: 2-phase buck controller with DCR current sensing and external sync input for EMI reduction in dense backplane environments.

Use Value: Sync pin allows alignment with system master clock - suppresses beat frequencies and simplifies conducted EMI filtering.

Use Scenario: Dual-rail power delivery (e.g., 1.8 V CPU + 3.3 V I/O) in industrial embedded computers with long product lifecycles and no redesign flexibility.

IC Role / Device Role / Timing Role: Dual independent buck controller with latch-type OVP and thermal shutdown - ensures fail-safe operation in unattended deployments.

Use Value: Latched overvoltage protection (OVP) prevents repeated fault cycling during transient surges - enhances system robustness without software intervention.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IR3621	Single-phase controller with integrated drivers; lacks dual-mode configurability and independent soft-start	Targeted at simpler, lower-current single-rail applications - not suitable for 2-phase or sequenced dual-output use cases	Select only if design requires integrated high/low-side drivers and does not need phase interleaving or independent channel control
ISL6269	Supports 3-phase operation and digital VID interface; higher integration but no R_DS(ON) current sensing	Designed for mobile CPU VRMs with dynamic voltage identification - incompatible with fixed-voltage DDR or GPU rails	Prefer for notebook CPU power delivery where VID protocol and 3-phase scalability are required

Compared with IR3621 and ISL6269, the IRU3146CFTR uniquely supports both 2-phase interleaving and independent dual-output modes with R_DS(ON) sensing, making it optimal for fixed-voltage, high-current POL applications where cost, efficiency, and layout simplicity are prioritized over digital control.

Availability

IRU3146CFTR is available at Aetrix Electronics and suitable for DDR memory power supplies, graphics card core voltage rails, and telecom point-of-load converters requiring stable component supply and long-term obsolescence management.

Supply support for IRU3146CFTR 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

International Rectifier (now part of Infineon Technologies) was a pioneer in power semiconductor innovation, specializing in high-performance analog and mixed-signal power management ICs for computing, telecom, and industrial markets.

The IRU3146 belongs to the IRU-series dual synchronous buck controller family, engineered specifically for high-current, low-voltage point-of-load regulation in DDR, GPU, and FPGA power architectures where efficiency, thermal performance, and layout density are critical.

FAQ

What is the maximum supported switching frequency per phase?

The IRU3146CFTR supports a programmable switching frequency up to 500 kHz per phase, set by an external resistor on the Rt pin. This allows optimization between efficiency (lower frequency) and component size (higher frequency), with typical operation at 300 kHz for balanced thermal and EMI performance in DDR and GPU applications.

How does the device implement current sharing in 2-phase mode?

In 2-phase mode, the IRU3146CFTR uses one channel as master (controlling output voltage via Fb1) and the other as slave (monitoring current via VP2 and OCSet2). It compares inductor current differences using DCR sensing or R_DS(ON) voltage drops, then adjusts the slave PWM duty cycle to match average current - achieving ±3% current balance without external op-amps.

Can the soft-start function be disabled or bypassed?

No, the soft-start function cannot be fully disabled - it initiates automatically upon V_CC, V_cH1, and V_cH2 exceeding their UVLO thresholds. However, pulling SS1/SD or SS2/SD below 0.3 V forces immediate shutdown of the corresponding channel, and connecting the soft-start pins directly to V_CC minimizes ramp time (though not recommended due to inrush risk).

What is the purpose of the VOUT3 pin and its current capability?

VOUT3 is the output of an internal 6.2 V LDO regulator powered from V_CC, rated for 50 mA continuous output with short-circuit protection. It supplies gate drivers (HDrv1/HDrv2) and can power external charge pump circuits. Its dedicated output avoids loading the main V_CC rail, improving stability during high-current gate charging events.

IRU3146CFTR Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 28-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 2

Output Phases:: 2

Voltage - Supply (Vcc/Vdd):: 4.5V ~ 16V

Frequency - Switching:: 300kHz

Duty Cycle (Max):: 85%

Synchronous Rectifier:: Yes

Clock Sync:: Yes

Serial Interfaces:: -

Control Features:: Current Limit, Enable, Frequency Control, Power Good, Soft Start

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP

IRU3146CFTR FAQ

1.How can I place an order for IRU3146CFTR through Aetrix?

Please submit a Request for Quotation (RFQ) for IRU3146CFTR 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 IRU3146CFTR reliable?

The price and inventory of IRU3146CFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU3146CFTR is usually 5 days.

3.What payment methods are accepted for IRU3146CFTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU3146CFTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRU3146CFTR?

IRU3146CFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRU3146CFTR 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 IRU3146CFTR?

For technical support, including IRU3146CFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU3146CFTR requirements.

6.How does Aetrix verify that IRU3146CFTR is sourced from the original manufacturer or authorized distributors?

All IRU3146CFTR 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 IRU3146CFTR meets industry standards.

7.What is the process for return or replacement of IRU3146CFTR?

All IRU3146CFTR units undergo pre-shipment inspection (PSI). If there is an issue with IRU3146CFTR, 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 IRU3146CFTR part is unused and in its original packaging.

Return procedure for IRU3146CFTR:

1.Submit a request within 90 days.

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

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