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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

Infineon Technologies IR2085STR

Name: IR2085STR
Brand: Infineon Technologies
SKU: IR2085STR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR2085STR

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: IR2085STR.pdf

Description:: IC GATE DRVR HALF-BRIDGE 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IR2085STR from Infineon Technologies is a self-oscillating half-bridge gate driver IC with integrated 50% duty cycle oscillator, 100V floating channel, ±1A peak drive current, adjustable 50–200ns dead-time, and programmable up to 500kHz switching frequency. It targets primary-side control in 36–75V DC-bus converters for telecom and industrial power supplies.

For engineers reviewing the IR2085STR datasheet, IR2085STR pinout, IR2085STR application, or IR2085STR equivalent, key selection criteria include bootstrap-compatible high-side operation up to +100V, pulse width matching within ±25ns, internal soft-start behavior after overcurrent events, and CT/RT-based frequency/dead-time co-tuning.

Technical Context

The IR2085STR implements a fixed 50% duty cycle oscillator whose frequency is set externally via RT (10–100kΩ) and CT (47–470pF), with f_OSC = 1/(2·R_T·C_T). Dead-time is directly controlled by CT value and ranges from 50ns to 200ns without additional circuitry.

It integrates undervoltage lockout on both V_CC (7.3V typical turn-on) and V_BS, internal soft-start that scales pulse width during startup and post-fault recovery, and adjustable overcurrent protection triggered at 200–300mV on the CS pin with 200ns shutdown delay.

Key Specifications

Parameter	Value and Actual Design Meaning
V_OFFSET max	100V - supports bootstrap high-side operation up to +100V referenced to VS
I_O+/I_O−	±1.0A - sufficient to drive low-Q_g MOSFETs at up to 500kHz without external buffers
f_OSC max	500kHz - enables compact magnetics in high-density 48V DC-bus converters
Dead-time range	50–200ns - prevents shoot-through in half-bridge topologies with discrete MOSFETs
Pulse matching	±25ns - ensures symmetrical high/low output timing across temperature and load
UVLO thresholds	V_CC: 6.8–7.8V - prevents erratic operation during brown-out conditions
Overcurrent trip	200–300mV on CS - compatible with standard 5mΩ–20mΩ sense resistors

Pinout & Package

IR2085STR is housed in an 8-lead SOIC package (JEDEC MS-012AA, 3.9mm × 4.9mm body, 1.27mm pitch), optimized for thermal dissipation and board-level noise immunity in high-frequency power stages.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Low-side logic supply input	Provides bias for internal logic and LO driver; requires local 0.1µF ceramic bypass
GND	Signal and power ground reference	Common return for all internal circuits; must connect to low-impedance ground plane
V_b	High-side floating supply input	Connects to bootstrap capacitor positive; rated for up to +150V transient
V_S	High-side floating supply return	Direct connection point to high-side MOSFET source; critical for noise-free level-shifting
H_O	High-side gate drive output	1A sink/source capable output; must route close to high-side MOSFET gate
L_O	Low-side gate drive output	1A sink/source capable output; referenced to GND; minimal trace inductance required
C_S	Overcurrent sense input	Comparator input for cycle-by-cycle current limiting; threshold 200–300mV
O_SC	Oscillator programming node	Connects external R_T and C_T; sets f_OSC and dead-time simultaneously

Key Features

Feature	Design Value
Self-oscillating architecture	Eliminates need for external clock generator or controller IC in isolated DC-bus converters
Integrated soft-start	Gradually increases output pulse width at power-up and after overcurrent fault recovery
Programmable dead-time	Set precisely via single CT capacitor-no separate dead-time resistor network required
Floating channel design	Enables direct bootstrap-based high-side drive without isolated gate supplies or transformers
Matched propagation delay	Ensures <±25ns skew between HO and LO edges across -40°C to +125°C operating range

Applications

Telecom 48V DC-Bus Converter

Industrial Half-Bridge SMPS

Use Scenario: Primary-side regulation in 48V input, 12V/24V output telecom power modules with strict size constraints.

IC Role / Device Role / Timing Role: Self-oscillating half-bridge driver providing synchronized 50% duty cycle gate signals with programmable frequency and dead-time.

Use Value: Reduces BOM count by eliminating external oscillator and dead-time generator; supports 500kHz operation for smaller magnetics.

Use Scenario: High-efficiency 36–75V input industrial DC-DC converter powering PLC I/O modules and sensors.

IC Role / Device Role / Timing Role: Gate driver enabling bootstrap-based high-side switching with precise pulse matching and overcurrent fault response.

Use Value: ±25ns pulse matching maintains ZVS/ZCS timing integrity; internal UVLO prevents startup under marginal input conditions.

Push-Pull DC-DC Converter

Redundant Power Supply Module

Use Scenario: Input-unrestricted push-pull topology used in battery-backed backup systems with wide VIN range (24–75V).

IC Role / Device Role / Timing Role: Dual-channel gate driver delivering matched complementary outputs without transformer center-tap dependency.

Use Value: Eliminates need for dual isolated drivers; CT/RT tuning allows consistent frequency scaling across input voltage variations.

Use Scenario: N+1 redundant 48V power shelf where reliability and fault containment are critical.

IC Role / Device Role / Timing Role: Fault-aware driver initiating soft restart after current-limit event, preventing latch-up during hot-swap transitions.

Use Value: Internal overcurrent shutdown with 200ns delay and automatic soft-start recovery improves system MTBF vs. latch-off alternatives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS2004STRPBF	Non-self-oscillating; requires external PWM input; no integrated oscillator or soft-start	Used in systems with existing controller ICs; lacks frequency/dead-time co-tuning	Select when precise external timing control is needed and oscillator integration is unnecessary
UCC27201D	120V floating capability; no integrated oscillator or overcurrent protection; higher 4A drive strength	Targeted at high-speed GaN or SiC half-bridges requiring fast edge rates and robust drive	Select for >1MHz designs or when external protection and timing logic already exist

Compared with IRS2004STRPBF and UCC27201D, the IR2085STR uniquely combines self-oscillation, internal soft-start, and CT-programmable dead-time in one SO-8 package-making it optimal for cost-sensitive, component-count-constrained 48V DC-bus converters where simplicity and reliability outweigh ultra-high-frequency or ultra-high-current needs.

Availability

IR2085STR is available at Aetrix Electronics and suitable for telecom power modules, industrial DC-DC converters, and redundant 48V power shelves requiring stable component supply and long-term lifecycle support.

Supply support for IR2085STR 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 global semiconductor leader focused on power management, automotive, and industrial applications, with deep expertise in high-voltage gate drivers and power conversion ICs.

The IR2085STR belongs to Infineon's legacy IR high-voltage driver family, designed specifically for simplified, self-contained half-bridge control in distributed 48V power architectures-prioritizing integration, reliability, and ease of use over programmability.

FAQ

What is the minimum recommended V_CC for reliable operation?

The IR2085STR specifies a typical UVLO turn-on threshold of 7.3V and recommends ≥9.5V for full specification compliance. Operation between 7.5V and 8.5V may cause asymmetrical HO/LO gate signals due to marginal internal bias margins, so 9.5V is advised for robust startup and steady-state performance.

How is dead-time adjusted, and what is its practical impact on layout?

Dead-time is set solely by the CT capacitor value (47–470pF), with lower CT yielding shorter dead-time. Layout impact is significant: CT and RT must be placed adjacent to the OSC pin with short, separated traces to V_CC and GND to avoid noise coupling that could destabilize oscillator timing or dead-time accuracy.

Can the IR2085STR drive SiC or GaN MOSFETs?

The IR2085STR delivers ±1A peak current and supports ≤500kHz operation-sufficient for many 650V SiC MOSFETs with Q_g < 20nC, but not ideal for high-speed GaN devices requiring faster edge rates or >1MHz switching. Its 40ns rise/20ns fall times and ±25ns pulse matching remain effective for SiC in telecom and industrial SMPS.

Does the IR2085STR require external bootstrap diode and capacitor?

Yes-V_b and V_S pins are designed for external bootstrap operation: a low-leakage Schottky diode connects from V_CC to V_b, and a ceramic capacitor (typically 0.1–1µF) connects from V_b to V_S. These components must be placed physically adjacent to the IC to maintain high-side supply stability during fast switching.

IR2085STR Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Driven Configuration:: Half-Bridge

Channel Type:: Independent

Number of Drivers:: 2

Gate Type:: N-Channel MOSFET

Voltage - Supply:: 10V ~ 15V

Logic Voltage - VIL, VIH:: -

Current - Peak Output (Source, Sink):: 1A, 1A

Input Type:: RC Input Circuit

High Side Voltage - Max (Bootstrap):: 100 V

Rise / Fall Time (Typ):: 40ns, 20ns

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

IR2085STR FAQ

1.How can I place an order for IR2085STR through Aetrix?

Please submit a Request for Quotation (RFQ) for IR2085STR 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 IR2085STR reliable?

The price and inventory of IR2085STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR2085STR is usually 5 days.

3.What payment methods are accepted for IR2085STR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR2085STR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR2085STR?

IR2085STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR2085STR 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 IR2085STR?

For technical support, including IR2085STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR2085STR requirements.

6.How does Aetrix verify that IR2085STR is sourced from the original manufacturer or authorized distributors?

All IR2085STR 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 IR2085STR meets industry standards.

7.What is the process for return or replacement of IR2085STR?

All IR2085STR units undergo pre-shipment inspection (PSI). If there is an issue with IR2085STR, 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 IR2085STR part is unused and in its original packaging.

Return procedure for IR2085STR:

1.Submit a request within 90 days.

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

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