Infineon Technologies IR1168SPBF

Overview

IR1168SPBF from International Rectifier is a dual smart secondary-side synchronous rectifier driver IC for LLC resonant half-bridge converters, featuring 200V drain-sense capability, 70ns turn-off propagation delay, 4A peak sink current, and 10.7V clamped gate drive-used to replace Schottky diodes in high-efficiency AC-DC adapters and LCD TV power supplies.

For engineers reviewing the IR1168SPBF datasheet, IR1168SPBF pinout, IR1168SPBF application, or IR1168SPBF equivalent, key selection criteria include differential V_DS sensing accuracy, anti-bounce logic timing, UVLO thresholds (7.0–8.5V), gate drive clamp stability, and SOIC-8 thermal performance under 500kHz switching.

Technical Context

The IR1168SPBF implements dual-channel independent sensing and control of N-channel MOSFETs using differential V_DS detection with programmable blanking (9–25µs) and double-pulse suppression to prevent false triggering in variable-frequency resonant topologies. It supports both fixed and variable frequency operation without external timing components.

Its gate driver delivers asymmetric drive strength-1A source / 4A sink-with internal 10.7V clamp and sub-120ns total propagation delay (60ns on / 70ns off), enabling precise zero-current-switching (ZCS) alignment for <1% conduction loss reduction versus passive rectification.

Key Specifications

Pinout & Package

IR1168SPBF is housed in an 8-lead SOIC package (SOIC-8N, MSL2, RoHS-compliant) with exposed pad thermal enhancement per JEDEC MS-012. Pin assignments are validated per IR's PD97382 datasheet and functional block diagram.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual synchronous rectifier driver applications.

Compared with UCC24612-2QDRQ1 and MP6908GJ-Z, IR1168SPBF uniquely supports 200V drain sensing and dual independent ZCS control in one SOIC-8 package-critical for high-voltage LLC outputs and multi-rail telecom systems where channel isolation and noise immunity are non-negotiable.

Availability

IR1168SPBF is available at Aetrix Electronics and suitable for AC-DC adapters, telecom SMPS, and LCD TV power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for IR1168SPBF 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 since 2015) was a pioneer in power semiconductor innovation, specializing in high-efficiency analog and mixed-signal power ICs for industrial and consumer power conversion.

The IR1168SPBF belongs to IR's SmartRectifier™ family-designed specifically to eliminate Schottky diode losses in resonant topologies through precision V_DS-based ZCS detection and robust gate drive.

FAQ

What is the purpose of the LOAD pin on IR1168SPBF?

The LOAD pin serves as the common reference node for differential V_DS sensing of both synchronous rectifiers. It connects to the shared source node of the SR MOSFETs and enables accurate zero-current detection by rejecting common-mode noise-critical for reliable operation in high-dv/dt LLC environments.

Does IR1168SPBF require external timing components for operation?

No. IR1168SPBF operates autonomously without external RC timing networks. Its blanking duration, minimum on-time, and propagation delays are internally fixed or trimmed during manufacturing-simplifying layout and eliminating component tolerance dependencies in high-volume adapter designs.

Can IR1168SPBF drive paralleled MOSFETs on a single channel?

Yes. Each gate driver (GATE1/GATE2) delivers 4A sink current and supports paralleled N-channel MOSFETs up to 10nF total gate charge. The differential sensing architecture maintains ZCS alignment across devices, provided source connections share a low-inductance path to the LOAD pin.

How does IR1168SPBF handle transformer leakage inductance effects?

IR1168SPBF mitigates leakage-induced false triggering via its programmable 9–25µs blanking window and double-pulse suppression logic. These features suppress gate activity during the initial ring period after primary switch turn-off-ensuring SR turn-on only occurs after true zero-current crossing is confirmed.