Renesas ISL89164FRTBZ

Overview

ISL89164FRTBZ from Renesas Electronics is a high-speed, dual-channel, 6A peak current MOSFET driver with inverting inputs and 5.0V CMOS-compatible logic thresholds. It features precision input thresholds for accurate RC-based time delays, non-overlapping output drive to prevent shoot-through, and UVLO with 400µs startup delay. It is used in synchronous rectifier control within isolated DC/DC converters.

For engineers reviewing the ISL89164FRTBZ datasheet, ISL89164FRTBZ pinout, ISL89164FRTBZ application, or ISL89164FRTBZ equivalent, key selection criteria include its 5.0V logic option (Option B), inverting input configuration, 20ns rise/fall times into 10nF, 6A peak sink/source capability, and thermal performance enabled by 3°C/W θJC in the 3×3 TDFN package.

Technical Context

The ISL89164FRTBZ implements separate, non-overlapping CMOS output stages per channel to eliminate shoot-through current during switching transitions. Its precision input thresholds (1.70–2.00V low, 3.00–3.30V high at -40°C to +125°C) enable stable external RC timing networks for dead-time control and SR turn-on alignment.

Startup behavior is defined by three voltage zones: below ~1V, outputs are weakly pulled low via internal 10kΩ resistors; between ~1V and UVLO (~3.3V), outputs are actively driven low with <1Ω resistance while ignoring inputs; above UVLO, outputs respond to logic after a fixed 400µs delay - ensuring glitch-free power-up in SMPS and motor drive systems.

Key Specifications

Pinout & Package

ISL89164FRTBZ is housed in an 8-lead 3×3 mm TDFN package (RoHS-compliant, Pkg. Dwg. L8.3x3I) with exposed thermal pad (EPAD) that must be soldered to PCB ground plane for optimal thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar MOSFET driver applications.

Compared with ISL89164FRTAZ and UCC27524ADRMR, the ISL89164FRTBZ uniquely combines 5.0V logic compatibility, per-channel enable inputs, and factory-trimmed precision thresholds - making it the only option among the three qualified for synchronous rectifier timing-critical designs requiring diode emulation and stable RC-delayed turn-on.

Availability

ISL89164FRTBZ is available at Aetrix Electronics and suitable for switch mode power supplies, synchronous rectifier drivers, and motor drives requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL89164FRTBZ 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

Renesas Electronics is a global semiconductor leader delivering high-performance analog, mixed-signal, and power management solutions for industrial, automotive, and communications infrastructure markets.

The ISL89164FRTBZ belongs to Renesas' high-speed power MOSFET driver family, engineered specifically for synchronous rectification, dead-time control, and high-frequency isolated DC/DC conversion with emphasis on timing accuracy and thermal robustness.

FAQ

What logic configuration does the ISL89164FRTBZ use?

The ISL89164FRTBZ uses inverting inputs for both channels (INA and INB), meaning a logic-low input produces a logic-high output. This configuration is optimized for synchronous rectifier timing alignment where SR turn-on must follow primary-side FET turn-off. The part marking "164B" confirms inverting logic (164) and 5.0V threshold option (B), as specified in FN7707 Rev.6.00 Table 1 and Ordering Information.

Does the ISL89164FRTBZ support paralleling of outputs?

Yes, the ISL89164FRTBZ supports safe paralleling of OUTA and OUTB to achieve 12A peak drive current, enabled by its <1ns propagation matching and identical output stage design. Renesas Application Note AN1603 explicitly validates this configuration for high-current SR applications. However, paralleling requires matched PCB traces for INA/INB and OUTA/OUTB, and is not supported for ISL89165 due to complementary logic.

What is the purpose of the ENA and ENB pins on the ISL89164FRTBZ?

The ENA and ENB pins provide independent per-channel enable control: when either enable is low, the corresponding output (OUTA or OUTB) is forced low regardless of the input state. This enables diode emulation in synchronous rectifiers - for example, disabling SRs during output discharge to prevent negative inductor current and capacitor ringing. The ISL89164FRTBZ datasheet confirms ENx and INx inputs are functionally interchangeable for alternate logic implementations.

How does the ISL89164FRTBZ handle power-up sequencing?

The ISL89164FRTBZ implements a three-stage power-up sequence: below ~1V, outputs are weakly pulled low via 10kΩ resistors; between ~1V and UVLO (~3.3V), outputs are actively driven low with <1Ω resistance while ignoring inputs; above UVLO, outputs respond to logic after a fixed 400µs delay. This prevents glitches and ensures FETs remain off until stable VDD is established, as shown in Figure 10 of FN7707 Rev.6.00.

What package type and thermal characteristics does the ISL89164FRTBZ have?

The ISL89164FRTBZ uses an 8-lead 3×3 mm TDFN package (Pkg. Dwg. L8.3x3I) with exposed thermal pad (EPAD). Its thermal resistance is θJC = 3°C/W (junction-to-case), enabling up to 33.3W max power dissipation when mounted on a copper plane. The EPAD must be soldered to PCB ground for both thermal management and low-noise operation, as emphasized in Section 7 of FN7707 Rev.6.00.