Renesas ISL8036IRZ-T7A

Overview

ISL8036IRZ-T7A from Renesas Electronics is a dual-channel synchronous buck regulator IC delivering up to 3A per channel at 1MHz fixed switching frequency, with integrated P- and N-channel MOSFETs, 0.8V reference voltage, and 180° phase interleaving for reduced input RMS current and EMI. It operates from 2.85V to 6V input, supports 0.8V–3.3V output voltages, and is used in point-of-load (POL) power for microcontrollers and FPGAs.

For engineers reviewing the ISL8036IRZ-T7A datasheet, ISL8036IRZ-T7A pinout, ISL8036IRZ-T7A application, or ISL8036IRZ-T7A equivalent, key selection criteria include dual 3A output capability, internal current-mode compensation, 1ms power-good timing, soft-start programmability via SS pin, and QFN-24 4mm×4mm package compatibility with thermal pad grounding.

Technical Context

The ISL8036IRZ-T7A implements a current-mode PWM control architecture with independent error amplifiers per channel, internal slope compensation, and 180° out-of-phase interleaved operation to minimize input capacitor ripple current and improve EMI performance. Each channel features dedicated EN, PG, FB, and LX pins, enabling flexible sequencing and monitoring.

It integrates low-R_DS(on) P-channel (75mΩ typ @ 6V) and N-channel (75mΩ typ @ 6V) MOSFETs, supports 100% duty-cycle operation for <250mV dropout at 3A, and includes reverse overcurrent protection, hiccup-mode short-circuit response, and thermal shutdown at 150°C with 25°C hysteresis.

Key Specifications

Pinout & Package

ISL8036IRZ-T7A is housed in a 24-lead 4mm × 4mm QFN package with 1mm max height and an exposed thermal pad (Pin 25) requiring connection to SGND for electrical integrity and thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual synchronous buck regulator applications.

Compared with ISL8036IRZ-T7A, the ISL8036AIRZ-T7A offers higher switching frequency for smaller passive components but reduces efficiency at light loads; the TPS54360BDR lacks dual-channel functionality entirely and cannot replicate interleaved ripple reduction or independent rail control.

Availability

ISL8036IRZ-T7A is available at Aetrix Electronics and suitable for DC/DC POL modules, µC/FPGA power systems, and Li-ion battery-powered devices requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for ISL8036IRZ-T7A 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 specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and communications markets.

The ISL8036IRZ-T7A belongs to Renesas' high-efficiency synchronous buck regulator product line, designed specifically for space-constrained, multi-rail point-of-load applications demanding low quiescent current, tight output regulation, and robust protection features.

FAQ

What is the maximum input voltage rating for the ISL8036IRZ-T7A?

The ISL8036IRZ-T7A has an absolute maximum input voltage rating of 6.5V DC or 7V for durations up to 20ms. Its recommended operating input range is 2.85V to 6V. Exceeding 6.5V may cause permanent damage to VIN1, VIN2, or VDD pins. The device is optimized for single Li+ cell (2.8–4.2V) or regulated 5V inputs, and its internal UVLO threshold is set at 2.85V with 100mV hysteresis to ensure clean startup.

Does the ISL8036IRZ-T7A support current sharing between channels to deliver 6A total?

Yes, the ISL8036IRZ-T7A supports current sharing mode to combine both channels into a single 6A output. This requires connecting FB1 to FB2 and configuring external components per Table 2 in the datasheet, including adjusting R6 and C6 values. In this mode, interleaved PWM reduces input and output ripple, and the device maintains ±2% output accuracy across load, line, and temperature. However, current sharing is not automatic-it requires proper PCB layout, matched inductors, and feedback network configuration.

How does the soft-start function work on the ISL8036IRZ-T7A, and can it be adjusted?

The ISL8036IRZ-T7A implements a current-source-based soft-start controlled by the SS pin. When SS is tied directly to VDD, the soft-start time is fixed at 1.5ms. To adjust it, connect a capacitor (C_SS) from SS to SGND; the ramp time follows t_SS = 6.25·C_SS, where C_SS must not exceed 33nF. This feature ensures controlled output voltage ramp-up, preventing inrush current and downstream supply sequencing issues. The internal 5µA current source charges C_SS linearly to generate the soft-start ramp.

What thermal performance can be expected from the ISL8036IRZ-T7A in a standard 4-layer PCB layout?

In a typical 4-layer PCB with 2oz copper, 10 thermal vias under the exposed pad, and 1cm² of 2oz copper pour connected to SGND, the ISL8036IRZ-T7A achieves θ_JA ≈ 36°C/W and θ_JC ≈ 2°C/W. At full 3A per channel (6A total) with 3.3V input and 1.8V output, junction temperature rise is approximately 45°C above ambient-well below the 150°C thermal shutdown threshold. Derating is recommended above +70°C ambient; thermal shutdown activates at 150°C with 25°C hysteresis to prevent latch-up.

Can the ISL8036IRZ-T7A synchronize to an external clock, and what is the supported frequency range?

Yes, the ISL8036IRZ-T7A supports external synchronization via the SYNC pin, which accepts negative-edge-triggered logic-level clocks. For the ISL8036 variant (1MHz), the supported synchronization range is 2.64MHz to 6MHz. When synchronized, each channel operates at half the input SYNC frequency-e.g., a 4MHz SYNC signal results in 2MHz per channel. This feature enables EMI reduction through frequency dithering or alignment with system clocks, and eliminates beat frequencies in multi-regulator systems.