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

Infineon Technologies AUIR2085S

Name: AUIR2085S
Brand: Infineon Technologies
SKU: AUIR2085S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUIR2085S

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

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

Datasheet:: AUIR2085S.pdf

Description:: IC GATE DRVR HALF-BRIDGE 8SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AUIR2085S from Infineon Technologies (formerly International Rectifier) is an automotive-grade, self-oscillating half-bridge gate driver IC with integrated 50% duty cycle oscillator, 100V floating high-side channel, ±1A peak output drive, programmable 50–500kHz switching frequency, and adjustable 50–200ns dead-time - designed for primary-side control in 48V distributed DC-DC converters.

For engineers reviewing the AUIR2085S datasheet, AUIR2085S pinout, AUIR2085S application, or AUIR2085S equivalent, key selection criteria include bootstrap-compatible 100V offset capability, ±25ns HO/LO pulse matching, undervoltage lockout thresholds (6.3–7.8V), overcurrent shutdown via CS pin (150–350mV threshold), and AEC-Q100 qualification for HEV auxiliary power systems.

Technical Context

The AUIR2085S implements a fixed-frequency, self-oscillating architecture where f_OSC is set externally by RT (10–100kΩ) and CT (47–470pF), enabling precise frequency tuning without external clock sources. Its dual-channel driver integrates independent high-side (VB/VS/HO) and low-side (VCC/LO) paths with matched propagation delays.

Dead-time is controlled solely by CT value (50–200ns range), while internal soft-start ramps output duty from 5–10% to 50% over ~1000 cycles - ensuring synchronized HO/LO edge alignment during startup and after overcurrent recovery. Undervoltage lockout operates separately on VCC and VB with hysteresis (±0.5V).

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Self-oscillating half-bridge driver with integrated 50% duty cycle oscillator
V_OFFSET max	100V DC - supports bootstrap operation up to +100V on VS node relative to COM
I_O+/I_O−	±1.0A peak - drives low-Qg MOSFETs directly without external buffers
f_OSC range	50–500kHz - set by RT/CT network; enables optimization for efficiency vs. EMI in 48V bus converters
Dead-time	50–200ns - adjustable via CT only; prevents shoot-through in hard-switched half-bridges
Pulse matching	±25ns HO/LO - ensures symmetrical conduction timing across full VS swing (0–100V)
UVLO thresholds	V_CC: 6.3–7.8V; V_BS: 6.3–7.8V - hysteresis prevents oscillation near turn-on/turn-off boundaries

Pinout & Package

Package: 8-lead SOIC (SO-8), RoHS-compliant, MSL3, AEC-Q100 qualified.

Pin/Terminal	Circuit Role	Design Meaning
COM	Reference ground terminal	Common return path for LO, CS, OSC, and internal logic; must be low-inductance connection to PCB ground plane
VCC	Low-side supply input	10–15V bias for internal logic and LO driver; powers UVLO and oscillator circuitry
HO	High-side gate drive output	Source-follower output referenced to VS; drives high-side MOSFET gate with ±1A peak current
VS	High-side floating source node	Switching node connection for bootstrap capacitor return; rated for −5V to +100V transient swing
LO	Low-side gate drive output	Ground-referenced output driving low-side MOSFET gate with ±1A peak current
CS	Overcurrent sense input	Analog comparator input (150–350mV threshold) for cycle-by-cycle current limiting and fault shutdown
OSC	Oscillator timing input	Connects to RT–CT network; sets f_OSC and dead-time; requires stable 100pF–470pF ceramic capacitor
VB	High-side bootstrap supply input	Accepts 10–15V bootstrap voltage; powers high-side driver stage and UVLO monitoring

Key Features

Feature	Design Value
Integrated oscillator + driver	Eliminates need for external clock generator and level-shifter, reducing BOM count by ≥3 components in 48V half-bridge converters
Programmable dead-time	50–200ns range set solely by CT value - enables fine-tuning to match MOSFET switching characteristics and minimize conduction loss
Soft-start with pulse matching	Ramps duty from 5–10% to 50% over ~1000 cycles while maintaining ±25ns HO/LO edge alignment - prevents transformer saturation and inrush current spikes
Separate UVLO on VCC/VB	Independent 6.3–7.8V thresholds with hysteresis ensure reliable start-up and fault recovery under asymmetric rail conditions
AEC-Q100 Grade 1	Qualified for −40°C to +125°C ambient operation with MSL3 packaging - suitable for under-hood HEV auxiliary converter environments

Applications

48V Distributed DC-DC Converter

HEV Auxiliary Power Supply

Use Scenario: Step-down conversion from 48V battery bus to 12V/5V rails for infotainment, lighting, and ADAS sensors.

IC Role / Device Role / Timing Role: Primary-side half-bridge driver controlling synchronous MOSFETs; provides self-oscillating 50% duty cycle with matched HO/LO edges.

Use Value: Reduces component count vs. controller+driver solutions; 100V offset rating accommodates bus transients; ±25ns pulse matching maintains ZVS/ZCS timing integrity.

Use Scenario: Isolated auxiliary converter powering 12V systems in hybrid electric vehicles during engine-off EV mode.

IC Role / Device Role / Timing Role: Gate driver for high-efficiency push-pull or half-bridge topology operating across wide input range (36–75V).

Use Value: AEC-Q100 qualification ensures reliability at 125°C junction temperature; soft-start prevents inrush into large output capacitors during cold cranking.

Battery Management System Converter

Industrial 48V Telecom PSU

Use Scenario: Bidirectional DC-DC stage in modular battery packs for cell balancing and charge redistribution.

IC Role / Device Role / Timing Role: Half-bridge driver enabling synchronous rectification in buck-boost topology with programmable dead-time for reverse conduction control.

Use Value: Adjustable 50–200ns dead-time prevents shoot-through during polarity reversal; CS pin enables precise current limiting for safe cell-level energy transfer.

Use Scenario: High-density 48V intermediate bus converter in telecom base station power shelves requiring compact, robust design.

IC Role / Device Role / Timing Role: Self-oscillating gate driver minimizing external timing components; supports 500kHz operation for smaller magnetics and faster transient response.

Use Value: ±1A drive strength eliminates need for gate buffers; SO-8 package enables standard reflow assembly and thermal management via exposed pad variants.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IR2104S	Non-self-oscillating; requires external PWM input; no integrated oscillator or soft-start; 600V V_BS rating	Suitable for higher-voltage industrial half-bridges but lacks AUIR2085S's 48V-optimized oscillator and automotive qualification	Select when external timing control is preferred and AEC-Q100 is not required
UCC27211D	High-speed dual-channel driver (12A peak); no oscillator or dead-time control; requires external logic and dead-time generator	Targeted at high-frequency GaN/SiC designs needing fast edge rates; lacks integrated protection features like CS-based OCP	Select for >1MHz SiC/GaN systems where discrete timing and protection are already implemented

Compared with IR2104S and UCC27211D, the AUIR2085S uniquely combines self-oscillation, automotive qualification, and integrated dead-time control - making it optimal for cost-sensitive, space-constrained 48V HEV auxiliary converters where minimal external components and guaranteed startup behavior are critical.

Availability

AUIR2085S is available at Aetrix Electronics and suitable for 48V distributed DC-DC converters, HEV auxiliary power supplies, and battery management system converters requiring stable component supply and AEC-Q100 compliance.

Supply support for AUIR2085S 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 acquired International Rectifier in 2015 and continues its legacy of high-performance power semiconductors and driver ICs for automotive, industrial, and renewable energy applications.

The AUIR2085S belongs to Infineon's automotive-grade gate driver product line, engineered specifically for robust, low-component-count DC-DC conversion in 36–75V vehicle electrical architectures.

FAQ

What is the maximum allowable dV/dt on the VS pin?

The AUIR2085S specifies a maximum allowable offset voltage slew rate of 50 V/ns on the VS node. Exceeding this may cause false triggering or latch-up due to internal level-shifter coupling. Layout best practices include minimizing parasitic inductance in the VS trace and using local ceramic decoupling between VS and COM.

Can the AUIR2085S drive both N-channel and P-channel high-side MOSFETs?

The AUIR2085S is designed exclusively for N-channel high-side MOSFETs in bootstrap configuration. Its floating channel architecture provides gate drive referenced to VS, requiring the MOSFET source to be connected to VS. It does not support P-channel high-side configurations or direct high-side current sensing.

How is overcurrent protection triggered and reset?

Overcurrent protection activates when the voltage on the CS pin exceeds the rising threshold (250–350mV). This triggers immediate shutdown of both HO and LO outputs with a 200ns delay. Recovery occurs automatically after the CS voltage falls below the falling threshold (150–250mV) and internal soft-start restarts - no external reset signal is needed.

Is the oscillator frequency affected by temperature or supply voltage variation?

According to the datasheet, f_OSC exhibits typical variation of ±5% over −40°C to +125°C ambient and ±3% across VCC = 10–15V. This stability is achieved through internal bandgap-referenced current sources driving the RT–CT network, making it suitable for automotive environments where rail and temperature fluctuations are common.

AUIR2085S 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:: PG-DSO-8-904

AUIR2085S FAQ

1.How can I place an order for AUIR2085S through Aetrix?

Please submit a Request for Quotation (RFQ) for AUIR2085S 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 AUIR2085S reliable?

The price and inventory of AUIR2085S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUIR2085S is usually 5 days.

3.What payment methods are accepted for AUIR2085S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUIR2085S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUIR2085S?

AUIR2085S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUIR2085S 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 AUIR2085S?

For technical support, including AUIR2085S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUIR2085S requirements.

6.How does Aetrix verify that AUIR2085S is sourced from the original manufacturer or authorized distributors?

All AUIR2085S 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 AUIR2085S meets industry standards.

7.What is the process for return or replacement of AUIR2085S?

All AUIR2085S units undergo pre-shipment inspection (PSI). If there is an issue with AUIR2085S, 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 AUIR2085S part is unused and in its original packaging.

Return procedure for AUIR2085S:

1.Submit a request within 90 days.

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

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