Renesas ISL8011IRZ-T

Overview

ISL8011IRZ-T from Intersil is a 1.2A integrated-FET synchronous buck regulator in a 10-lead 3mm×3mm DFN package, operating from 2.7V to 5.5V input and delivering adjustable output down to 0.8V with ±3% accuracy over temperature/load/line. It features 1.5MHz PWM switching, internal digital soft-start, and 100% duty-cycle operation for ultra-low dropout (<200mV at 1.2A), targeting point-of-load power for µC/FPGA/DSP cores.

For engineers reviewing the ISL8011IRZ-T datasheet, ISL8011IRZ-T pinout, ISL8011IRZ-T application, or ISL8011IRZ-T equivalent, key selection criteria include its integrated P/N-MOSFET pair (R_DS(on) ≈ 150mΩ each), 200ms POR timer, logic-controlled shutdown current <2µA, thermal shutdown at +150°C, and internal loop compensation eliminating external compensation components.

Technical Context

The ISL8011IRZ-T employs fixed-frequency current-mode PWM control with slope compensation for stability, using the P-MOSFET's R_DS(on) as the current sense element (gain = 0.4V/A). Its error amplifier is a transconductance type (20µA/V) with internal 25pF/400kΩ RC compensation, clamping maximum output to 1.172V.

Overcurrent protection triggers at 2.1A peak switch current via CSA1 monitoring; short-circuit protection reduces switching frequency to 1/3 when FB falls below 0.2V. The 200ms POR delay is generated internally and asserts open-drain low until FB reaches 0.736–0.864V window.

Key Specifications

Pinout & Package

ISL8011IRZ-T is housed in a RoHS-compliant 10-lead 3mm×3mm DFN package (L10.3x3C) with exposed thermal pad tied to PGND. The package height is ≤1mm, and the thermal resistance is θ_JA = 48°C/W, θ_JC = 5°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62130ARGTR and RT8059GJ6F, the ISL8011IRZ-T uniquely combines 100% duty cycle, integrated 200ms POR, and output capacitor discharge in a 3mm×3mm footprint-making it optimal for battery-fed, space-constrained POL applications demanding deterministic power sequencing and extended runtime.

Availability

ISL8011IRZ-T is available at Aetrix Electronics and suitable for DC/DC POL modules, µC/FPGA power delivery, and portable instrumentation requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for ISL8011IRZ-T 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 (now part of Renesas Electronics) is a U.S.-based analog and power management semiconductor designer known for high-efficiency DC/DC solutions and precision analog ICs.

The ISL8011IRZ-T belongs to Intersil's integrated-FET synchronous buck regulator product line, engineered specifically for compact, high-efficiency point-of-load conversion in portable, telecom, and embedded computing systems.

FAQ

What is the maximum output current capability of the ISL8011IRZ-T?

The ISL8011IRZ-T guarantees a minimum continuous output current of 1.2A across its full operating temperature range (-40°C to +85°C) and input voltage range (2.7V to 5.5V). Peak switch current limit is 2.1A, and the device includes overcurrent protection that disables the P-MOSFET if this threshold is exceeded. Derating may be required above +85°C ambient depending on PCB thermal design.

Does the ISL8011IRZ-T require external compensation components?

No, the ISL8011IRZ-T features internal loop compensation using a fixed 25pF capacitor and 400kΩ resistor network. This eliminates the need for external compensation components, simplifying design, reducing BOM count, and improving consistency across production units. The internal compensation is optimized for standard 1.8µH inductors and 10µF ceramic output capacitors.

How does the ISL8011IRZ-T handle output capacitor discharge during shutdown?

When the EN pin is pulled low, the ISL8011IRZ-T actively turns on its internal N-channel MOSFET to discharge the output capacitor through the PHASE and PGND pins. This controlled discharge prevents floating voltages and ensures safe, predictable power-down behavior-critical for systems with multiple sequenced rails or sensitive downstream logic.

What is the purpose and timing accuracy of the POR pin on the ISL8011IRZ-T?

The POR (Power-On Reset) pin on the ISL8011IRZ-T provides a 200ms delayed open-drain power-good signal, with specified delay range of 150–275ms. It asserts low until the FB voltage stabilizes within 89.5–110.5% of the nominal output voltage, ensuring microprocessors and FPGAs receive a clean reset signal only after regulation is established.

Can the ISL8011IRZ-T operate with input voltage below its output voltage?

Yes-the ISL8011IRZ-T supports 100% duty-cycle operation, allowing it to maintain regulation even when the input voltage drops close to the output voltage. At 1.2A load, dropout is less than 200mV, meaning it can sustain a 1.8V output with input as low as ~2.0V. This feature significantly extends usable battery life in portable applications.