Renesas HIP4081AIBT

Overview

HIP4081AIBT from Intersil is a high-frequency, 80V/2.5A peak full-bridge N-channel FET driver IC in 20-lead SOIC (Wide) package. It independently drives four external N-MOSFETs in half-bridge or full-bridge topologies, supports up to 1MHz switching, features user-programmable dead time via HDEL/LDEL pins, and integrates on-chip charge-pump and bootstrap bias supplies. It is used in voice coil motor drivers and high-performance switching power amplifiers.

For engineers reviewing the HIP4081AIBT datasheet, HIP4081AIBT pinout, HIP4081AIBT application, or HIP4081AIBT equivalent, key selection criteria include its 55ns typical propagation delay, 10ns rise/fall times into 1000pF, 80V high-side bus capability, adjustable dead-time control, and compatibility with 5V–15V logic inputs across –40°C to +85°C ambient.

Technical Context

The HIP4081AIBT implements dual independent gate driver channels (A and B), each with separate high-side and low-side outputs, level-shifted high-side drivers using internal charge-pump and bootstrap supplies, and logic-controlled shoot-through prevention via input override hierarchy (e.g., ALI overrides AHI). Its architecture supports both independent and bistate operation modes.

Dead time is set externally via resistors on HDEL and LDEL pins, establishing timing currents that delay high-side turn-on or low-side turn-on respectively-ensuring no simultaneous conduction. The DIS pin provides synchronous global disable with sub-100ns propagation delay to all outputs, overriding all input controls.

Key Specifications

Pinout & Package

Package: 20-lead SOIC (Wide), body width 7.60 mm, JEDEC MS-013-AC compliant, Pb-free (HIP4081AIBZ variant), thermal resistance θ_JA = 85°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HIP4080AIBZ, HIP4081AIBT removes the comparator for cleaner logic-only control; versus IR2110PbF, it delivers faster timing, lower layout complexity, and tighter integration-but at lower voltage rating.

Availability

HIP4081AIBT is available at Aetrix Electronics and suitable for voice coil motor drivers, high-frequency switching power supplies, and Class-D amplifier designs requiring stable component supply, long-term industrial availability, and Pb-free compliance.

Supply support for HIP4081AIBT 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

Intersil Corporation is a pioneer in high-performance analog and power management ICs, now part of Renesas Electronics, with deep expertise in gate drivers, DC-DC controllers, and precision signal conditioning.

The HIP4081AIBT belongs to Intersil's high-frequency bridge driver product line, engineered specifically for demanding motion control and high-fidelity power conversion applications where timing accuracy, shoot-through immunity, and thermal robustness are critical.

FAQ

What is the maximum switching frequency supported by the HIP4081AIBT?

The HIP4081AIBT supports switching frequencies up to 1MHz while maintaining 10ns rise/fall times into a 1000pF load under free-air conditions at 50°C. This capability is enabled by its 2.5A peak output current and low 55ns propagation delay, making HIP4081AIBT suitable for high-efficiency resonant and Class-D topologies where timing fidelity is essential.

Does the HIP4081AIBT require external bootstrap diodes and capacitors?

Yes, the HIP4081AIBT requires external bootstrap diodes and capacitors connected to pins AHB/AHS and BHB/BHS. Although it includes an on-chip charge pump supplying ~30μA to sustain the bootstrap voltage, the primary energy storage and voltage transfer rely on external components. The internal clamp limits the bootstrap supply to approximately 12.8V, ensuring safe gate overdrive for standard N-MOSFETs.

How does the HIP4081AIBT prevent shoot-through in half-bridge configurations?

The HIP4081AIBT prevents shoot-through through three mechanisms: (1) hardware input priority (e.g., ALI overrides AHI), (2) user-programmable dead time via HDEL and LDEL resistors, and (3) synchronous DIS pin override. These features ensure that high-side and low-side drivers for the same leg cannot be active simultaneously-even under transient or misconfigured logic conditions-making HIP4081AIBT inherently shoot-through resistant.

Can the HIP4081AIBT drive both high-side and low-side N-MOSFETs in a full-bridge without additional level-shifting components?

Yes, the HIP4081AIBT integrates level-shifted high-side drivers with on-chip charge-pump and bootstrap bias supplies, enabling direct drive of high-side N-MOSFETs up to 80V without external level shifters. Its AHB/BHB pins provide regulated floating supplies, and AHS/BHS pins serve as local source references-allowing full-bridge operation with only external bootstrap diodes and capacitors. This eliminates discrete level-shifter ICs or transformers traditionally needed for N-MOSFET bridges.

What is the operating temperature range and thermal performance of the HIP4081AIBT?

The HIP4081AIBT is rated for operation from –40°C to +85°C ambient temperature, with a maximum junction temperature of 125°C. In its SOIC (Wide) package, it exhibits a typical thermal resistance θ_JA of 85°C/W in free air. Derating curves in the datasheet confirm stable electrical performance across this range, including consistent 10ns rise/fall times and undervoltage lockout thresholds, making HIP4081AIBT suitable for thermally demanding industrial environments.