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

Infineon Technologies IR2085S

Name: IR2085S
Brand: Infineon Technologies
SKU: IR2085S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR2085S

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

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

Datasheet:: IR2085S.pdf

Description:: IC GATE DRVR HALF-BRIDGE 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,380

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Product details

Overview

IR2085S from Infineon Technologies is a self-oscillating half-bridge gate driver IC with integrated 50% duty cycle oscillator, rated for 100V floating offset, ±1A peak drive current per channel, programmable frequency up to 500kHz, and adjustable dead-time from 50ns to 200ns. It enables compact, low-component-count DC-bus converters in 36–75V distributed power systems.

For engineers reviewing the IR2085S datasheet, IR2085S pinout, IR2085S application, or IR2085S equivalent, key selection criteria include bootstrap-compatible high-side operation up to +100Vdc, pulse width matching within ±25ns, undervoltage lockout thresholds (7.3V typ), soft-start behavior after overcurrent events, and CT/RT-based frequency/dead-time tuning.

Technical Context

The IR2085S implements a fixed 50% duty cycle oscillator whose frequency is set externally via RT and CT (f_OSC = 1/(2·R_T·C_T)), with CT also determining dead-time. Its floating high-side channel supports bootstrap operation up to +100Vdc referenced to VS, and internal soft-start modulates pulse width during startup and post-fault recovery.

Overcurrent protection triggers on CS pin voltage exceeding 200–350mV thresholds, initiating shutdown and automatic restart. Undervoltage lockout acts independently on VCC (7.3V typ) and VB (7.3V typ), while HO/LO outputs maintain pulse width matching within ±25ns across VS = 0–100V.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Self-oscillating half-bridge driver with fixed 50% duty cycle
V_OFFSET (max)	100V - supports bootstrap high-side operation up to +100Vdc above VS
I_O+/I_O− (peak)	±1.0A - sufficient to directly drive low-Q_g MOSFETs without external buffers
f_OSC (max)	500kHz - enables high-frequency converter designs with reduced magnetics size
Dead-time range	50–200ns - adjustable via CT value to prevent shoot-through in fast-switching bridges
Pulse matching	±25ns - ensures symmetrical high/low output timing across full VS operating range
UVLO threshold	7.3V (typ) on both VCC and VB - prevents erratic operation during brown-out conditions

Pinout & Package

IR2085S is housed in an 8-lead SOIC package (JEDEC MS-012AA), with exposed pad not electrically connected. The package supports surface-mount assembly and provides thermal resistance R_thJA = 200°C/W under board-mounted, still-air conditions.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Logic supply input	Bias voltage source (10–15V); powers internal logic and low-side driver; UVLO active below 7.3V
GND	Signal and power ground reference	Common return for all internal functions; requires low-impedance PCB ground plane
Vb	High-side floating supply input	Bootstrap-derived supply for high-side driver; must be ≥ VCC + 10V for reliable operation
VS	High-side floating supply return	Connects directly to high-side MOSFET source; defines floating reference for HO output
HO	High-side gate drive output	Drives high-side MOSFET gate; capable of ±1A peak current; referenced to VS
LO	Low-side gate drive output	Drives low-side MOSFET gate; capable of ±1A peak current; referenced to GND
CS	Overcurrent sense input	Monitors current-sense resistor voltage; trips shutdown at 200–350mV; initiates soft start on recovery
OSC	Oscillator timing interface	Connects external RT and CT to set f_OSC and dead-time; CT value directly scales dead-time

Key Features

Feature	Design Value
Integrated oscillator + driver	Eliminates need for external clock generator and level-shifting circuitry in half-bridge control
Adjustable dead-time	50–200ns via CT selection - enables precise shoot-through prevention without external delay networks
Internal soft-start	Automatically extends pulse width at power-up and after overcurrent fault - prevents inrush current and ensures controlled startup
Independent UVLO	Separate thresholds on VCC and VB - guarantees safe operation even if bootstrap supply lags bias supply
Pulse width matching	±25ns tolerance across 0–100V VS swing - maintains balanced switching in wide-input-voltage converters

Applications

Telecom DC-Bus Converter

Industrial 48V Power Distribution

Use Scenario: Step-down conversion from 48V bus to 12V/5V rails in telecom shelf power supplies.

IC Role / Device Role / Timing Role: Half-bridge driver controlling primary-side MOSFETs; self-oscillating clock eliminates external timing IC.

Use Value: Reduces BOM count by integrating oscillator and dual drivers; 500kHz max frequency allows smaller magnetics and faster transient response.

Use Scenario: Distributed power architecture in factory automation controllers requiring isolated 24V/15V outputs.

IC Role / Device Role / Timing Role: Primary-side gate driver in half-bridge forward or resonant converter; handles 36–75V input range.

Use Value: Bootstrap-compatible 100V offset enables direct use with standard 60V MOSFETs; ±25ns pulse matching ensures stable duty cycle under load transients.

Push-Pull Converter

LED Driver for High-Voltage Strings

Use Scenario: Isolated push-pull DC-DC stage in medical equipment power supplies with unrestricted input voltage range.

IC Role / Device Role / Timing Role: Dual-channel gate driver with matched timing; operates without bootstrap constraints in push-pull topology.

Use Value: Eliminates need for separate gate drive transformers; ±1A drive strength supports fast turn-on of medium-Q_g MOSFETs at up to 500kHz.

Use Scenario: Constant-current LED driver powering 40–80V LED strings from 48V input in architectural lighting systems.

IC Role / Device Role / Timing Role: Half-bridge driver controlling series-resonant tank; CS pin used for LED current regulation via shunt sensing.

Use Value: Adjustable overcurrent threshold (200–350mV) enables precise current limit setting; soft-start prevents LED inrush stress during cold start.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS21844SPbF	External oscillator required; no integrated 50% oscillator; higher V_BS rating (600V)	Suited for higher bus voltages (>100V); lacks self-oscillation simplification	Select when bootstrap operation >100V is needed and external clock control is preferred
UCC27201AD	No integrated oscillator or dead-time control; 4A peak drive; 120V V_DD rating	Requires external PWM controller and dead-time generator; higher drive strength for larger MOSFETs	Select when maximum gate drive current (>1A) and independent PWM timing are required

Compared with IRS21844SPbF and UCC27201AD, the IR2085S uniquely integrates oscillator and dead-time tuning in one SO-8 package-reducing component count and layout complexity for 36–75V self-oscillating half-bridge converters where simplicity and space savings outweigh the need for external timing flexibility or ultra-high drive current.

Availability

IR2085S is available at Aetrix Electronics and suitable for telecom DC-bus converters, industrial 48V power distribution systems, and LED driver designs requiring stable component supply and long-term production continuity.

Supply support for IR2085S 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 specializing in power management, automotive, and industrial control solutions, with core expertise in high-voltage gate drivers and energy-efficient power conversion.

The IR2085S belongs to Infineon's legacy IR high-speed gate driver product line, designed specifically for cost-sensitive, space-constrained half-bridge and push-pull DC-DC converters in 36–75V distributed power architectures.

FAQ

What is the minimum recommended VCC voltage for reliable IR2085S operation?

The IR2085S specifies a typical undervoltage lockout (UVLO) threshold of 7.3V on VCC, but reliable operation-including symmetrical HO/LO output pulses-requires VCC ≥ 9.5V. Operation between 7.5V and 8.5V may cause pulse asymmetry due to marginal internal bias margins, as confirmed in the datasheet's Recommended Operating Conditions table.

How is dead-time adjusted on the IR2085S, and what is its practical tuning range?

Dead-time is set solely by the CT capacitor value connected to the OSC pin: lower CT yields shorter dead-time (down to 50ns), higher CT yields longer dead-time (up to 200ns). RT sets frequency only; CT does not affect f_OSC. Datasheet Figure 2 confirms 50–200ns range across CT = 47–470pF with RT = 10–100kΩ.

Can the IR2085S drive high-side MOSFETs with V_DS > 100V?

No-the IR2085S is rated for a maximum high-side floating supply offset (V_S) of 100V. Exceeding this violates Absolute Maximum Ratings (V_S ≤ V_b + 0.3V, V_b ≤ 150V), risking device failure. For >100V bus applications, use alternatives like IRS21844SPbF rated for 600V V_BS.

Does the IR2085S require external bootstrap diode and capacitor, and what are critical layout guidelines?

Yes-bootstrap operation requires a low-leakage Schottky diode and ceramic capacitor connected between V_b and V_S. Layout must place these components within 5mm of the IR2085S pins, use short direct traces to VS and V_b, and avoid routing noisy signals near the bootstrap loop to prevent false triggering or gate drive collapse.

IR2085S Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Driven Configuration:: Half-Bridge

Channel Type:: Synchronous

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

IR2085S FAQ

1.How can I place an order for IR2085S through Aetrix?

Please submit a Request for Quotation (RFQ) for IR2085S 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 IR2085S reliable?

The price and inventory of IR2085S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR2085S is usually 5 days.

3.What payment methods are accepted for IR2085S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR2085S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR2085S?

IR2085S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR2085S 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 IR2085S?

For technical support, including IR2085S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR2085S requirements.

6.How does Aetrix verify that IR2085S is sourced from the original manufacturer or authorized distributors?

All IR2085S 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 IR2085S meets industry standards.

7.What is the process for return or replacement of IR2085S?

All IR2085S units undergo pre-shipment inspection (PSI). If there is an issue with IR2085S, 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 IR2085S part is unused and in its original packaging.

Return procedure for IR2085S:

1.Submit a request within 90 days.

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

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