Renesas ISL6236AIRZ-T

Overview

ISL6236AIRZ-T from Renesas Electronics (formerly Intersil) is a high-efficiency, quad-output main power supply controller for notebook computers. It integrates two constant-on-time PWM controllers (SMPS1: 0.7–5.5V adjustable or fixed 1.5V/5V; SMPS2: 0–2.5V adjustable or fixed 1.05V/3.3V), a 100mA/200mA switchable LDO, and dual power-good outputs. It operates across 4.5V–25V input and supports ultrasonic skip mode to eliminate audible noise in battery-powered systems.

For engineers reviewing the ISL6236AIRZ-T datasheet, ISL6236AIRZ-T pinout, ISL6236AIRZ-T application, or ISL6236AIRZ-T equivalent, key selection considerations include its dual independent PWM control with 100ns load-step response, programmable current limit with foldback, selectable operating modes (PWM/skip/ultrasonic), and integrated 3.3V/5V reference outputs for DDR memory and core logic rails.

Technical Context

The ISL6236AIRZ-T employs a constant-on-time architecture eliminating external sense resistors while delivering 100ns transient response. Its dual PWM channels operate at independently selectable frequencies (200/300/400/500kHz) via the TON pin, with ultrasonic skip mode maintaining switching above 25kHz to avoid audio-band interference.

It features r_DS(ON)-based current sensing, programmable current-limit thresholds (adjustable from 40mV to 215mV), and independent enable/POK signals per SMPS channel. The LDO supports bootstrapping to BYP and switchover to 200mA sourcing when BYP is active, enabling seamless transition between regulated and bypassed supplies.

Key Specifications

Pinout & Package

ISL6236AIRZ-T is housed in a RoHS-compliant, thermally enhanced 32-lead 5mm × 5mm QFN package with exposed thermal pad (PKG DWG # L32.5x5B). The package supports high-power dissipation (θ_JA = 32°C/W) and requires soldering to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-output power controller applications.

Compared with RT8209MZQW and TPS51220ARUKR, the ISL6236AIRZ-T uniquely combines fully adjustable dual SMPS outputs, integrated switchable LDO, ultrasonic skip mode, and 100ns transient response in a single 5×5mm QFN-reducing component count and acoustic noise without sacrificing flexibility.

Availability

ISL6236AIRZ-T is available at Aetrix Electronics and suitable for notebook computers, DDR memory power systems, and mobile communication devices requiring stable component supply across extended temperature (-40°C to +100°C) and long-lifecycle production programs.

Supply support for ISL6236AIRZ-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

Renesas Electronics Corporation is a global semiconductor leader formed from the merger of Renesas Technology and NEC Electronics, specializing in microcontrollers, analog, and power management ICs.

The ISL6236AIRZ-T belongs to Renesas' legacy Intersil notebook power controller family, designed specifically for high-efficiency, low-noise, multi-rail power delivery in space-constrained portable computing platforms.

FAQ

What is the maximum output current capability of the ISL6236AIRZ-T's integrated LDO?

The ISL6236AIRZ-T's integrated LDO delivers up to 100mA continuously under normal regulation. During switchover-when the BYP pin is active-the LDO output connects through an internal switch to deliver up to 200mA, supporting peak I/O loads without external boost circuitry. This behavior is confirmed in the Electrical Specifications table on page 5 of FN6453 Rev 3.00.

Does the ISL6236AIRZ-T support independent enable and power-good signaling for each SMPS channel?

Yes, the ISL6236AIRZ-T provides independent EN1/EN2 enable inputs and open-drain POK1/POK2 outputs for SMPS1 and SMPS2. Each POK asserts low during soft-start, undervoltage, overvoltage, or thermal fault conditions, and goes high-impedance only after regulation is achieved and soft-start completes. This is explicitly defined in the Pin Descriptions section (pages 7–8) of FN6453.

How does the ultrasonic skip mode in the ISL6236AIRZ-T suppress audible noise?

The ISL6236AIRZ-T's ultrasonic skip mode maintains switching frequency between 25kHz and 37kHz-above human hearing range-by dynamically adjusting pulse density while preserving constant-on-time control. This eliminates coil whine in notebook speakers and audio subsystems without degrading light-load efficiency. The specification is verified in the Electrical Specifications table (page 4) and Figure 21 of FN6453.

Can the ISL6236AIRZ-T generate both 1.05V and 3.3V simultaneously from its SMPS2 channel?

No. SMPS2 generates a single output voltage determined by the REFIN2 input: fixed 1.05V (when tied to VREF3), fixed 3.3V (when tied to VCC), or adjustable 0–2.5V (via external divider). It cannot produce both voltages concurrently. The dual fixed outputs (1.05V/3.3V) refer to configuration options-not simultaneous operation-and are mutually exclusive per the Pin Descriptions (page 8) and Applications section (page 1) of FN6453.

What is the purpose of the SECFB pin on the ISL6236AIRZ-T?

The SECFB pin monitors an optional external 14V charge pump used to bias high-side MOSFET gates. When SECFB voltage drops below 1.92V, LGATE1 pulses for 300ns to refresh the charge pump capacitor without discharging the output. This function is documented in the Pin Descriptions (page 8) and enables reliable high-side drive in high-input-voltage configurations, such as 4-cell Li+ battery systems.